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hi ther i wonder if you could help me on this simple task. I'm creating a GPS application to run on the XDA2, i'm using eVC++ to do the implementation.
at the moment i'm reading the GPS signal via bluetooth over a virtual COM port, the signal coming from the GPS if a ASCII sinal and i'm duimping this into a char buffer.
However i need to convert this to UNICODE in order to display it on the Pocket PC, how's best to convert a buffer full of ASCII into Unicode so i may display it?
I tried using MultiByteToWideChar(), but it doesn't seem to work properly, maybe i haven't set it up correctly? Could someone point me in the right direction!
Below is an example of what i tried:
Code:
char buf[50]; // contains output from GPS
TCHAR Message[50]; //where i intended to put the message so i could display it
MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, buf, -1, Message, 0);
Thank in advance
I'm sure it's not the right way to go about it, but I generally wsprintf for short strings.
However, don't listen to me, I'm a mad man. Check this page out instead:
http://www.i18nguy.com/unicode/c-unicode.html
V
Thanks for that, out of curiosity, how would you use wsprintf to convert ASCII to unicode, i tried that before with no real success!
The last value passed to MultiByteToWideChar tells this function the size of the result buffer, Message in your case. You have passed zero, all that does is makes the function return the size of a TCHAR variable it needs to put the Ascii input buf into.
You need to put sizeof(Message) as the last parameter and not zero.
The other way (better way ?) of doing this is first you call the MultiByteToWideChar function with the zero parameter as you have and then you malloc the result * sizeof(TCHAR).
Thanks for the advise, after looking into the function more i realised this is where i was going wrong, and i have now managed to make the conversion. Thanks for pointing that out though!
Hello Everyone
I hope this is not too trivial a question. I am new to eVC. I would like to know how to convert from data type LONG to data type CHAR OR STRING in eVC.
Long myLong=1134.67
In VB the conversion will simply be
myString=STR(myLong)
How can I achieve this in eVC++?
Also someone please recommend some good books on eVC++.
Thanks.
ajanaman
evc++ is just like vc++
which is just like c++ with mfc on top of it
to do simple type casts you do
x=(Type)y;
here are some links also included dynamic type casts
http://www.cplusplus.com/doc/tutorial/typecasting.html
http://www.torjo.com/win32gui/doc/window_casting.html
Hello gsmtexts!
First I would like to point out that in C++ LONG data type is a 4 byte signed integer (in your example you use a floating point value).
Second I assume that by converting you mean representing the number as a string of characters an not just letting the computer assume that the variable contains ASCII values instead of a number.
Here's how you do it:
C++ language doesn't have string data type instead you use an array of char.
Example:
Code:
char myStr[255]; //you have a string of up to 255 ASCII chars.
double myVal = 50.1234; //a double precision floating point value
_gcvt(myVal, 6, myStr); //convert the string
You could use one of the functions (you can search the MSDN site for more details): _gcvt, _ecvt, _fcvt, but there is a simpler way as well:
Code:
WCHAR myStr[255]; //win CE works with Unicode strings.
float myVal = 1.2345; //the value
swprintf(myStr, L"The value: %f", myVal); //creates a string: 'The value: 1.2345'
Finally if you are using MFC:
Code:
CString str;
float myVal = 1.2345;
str.Format(_T("The value: %f"), myVal);
As for books I can only recommend "Teach yourself C++", by Jesse Liberty, it got me started in C++ programming.
Good luck.
Dear levenum
many thanks - I have sratched my head for nearly a week and you gave me the solution just like that. _gcvt did it. u are a wonderful guru.
ajanaman
You are welcome gsmtexts!
But I am far from being a guru. I just like programming so I picked up a book or two and the ball started rolling. 8)
Anyway, since you chose to use _gcvt you should know that in order to use the string you get with windows API's like SetWindowText you will have to convert it to Unicode:
Code:
WCHAR uniBuffer[50]; //Unicode buffer
char myString[50]; //ASCII buffer
_gcvt(1.2345, 5, myString); //convert value to string
mbstowcs(uniBuffer, myString, 50); //convert ASCII string to Unicode
The standard c++ way would be:
double d=122.332;
std:stringstream oss;
oss << d;
std::string mystring=oss.str();
The standard c++ way would be:
double d=122.332;
std:stringstream oss;
oss << d;
std::string mystring=oss.str();
Anyone know how to pass a pointer to a struct in VB.NET that could help me out?
" pGPSPosition
Pointer to a GPS_POSITION structure. On return, this structure is filled with location data obtained by the GPS Intermediate Driver. The dwValidFields member of the GPS_POSITION instance specifies which fields of the instance are valid."
This is from a link on MS site: (http://msdn2.microsoft.com/en-us/library/bb202050.aspx)
So how do I do this in VB?
Looking for a little love here...
TIA,
WM6 SDK contains the sample with the complete wrapper around the GPS intermediate driver in the managed code
But one warning - on some devices (namely HTC Artemis) the serious bug in some version of code provided by Microsoft to Oem return an error when calling functions this API. Communication with a GPS via serial port is still more reliable for a commercial solutions...
Appreciate the response but do you have any source that I can use with VB? My biggest problem is actually retrieving any information from the GPS device using the "GPSGetPosition" function. (see other link - http://forum.xda-developers.com/showthread.php?p=1979418#post1979418)
"But one warning - on some devices (namely HTC Artemis) the serious bug in some version of code provided by Microsoft to Oem return an error when calling functions this API"
Could you be a little more specific?
TW,
Semi manual marshhalling of structure to pointer:
Dim pointerM As IntPtr = Marshal.AllocHGlobal(Marshal.SizeOf(myStruct))
Marshal.StructureToPtr(myStruct, pointerM, False)
Marshal.FreeHGlobal(pnt)
Ad Artemis and another devices) GPS structure has invalid size from old platform builder and intermediate driver (GPS API) refuse it with error.
RStein,
As I was reading about it appeared that Marshaling was going to have to be used in some way since I'm pretty sure that the struct would need to be passed to the C function.
Which brings me to another Q since it appears your are savy at programing in C - how to convert the following C struct?
The struct appears to have a couple of arrays and a few other enums thats are passed to the function, how is that handled in VB?
DWORD GPSGetPosition(
HANDLE hGPSDevice,
GPS_POSITION *pGPSPosition,
DWORD dwMaximumAge,
DWORD dwFlags
);
typedef struct _GPS_POSITION {
DWORD dwVersion;
DWORD dwSize;
DWORD dwValidFields;
DWORD dwFlags;
SYSTEMTIME stUTCTime;
double dblLatitude;
double dblLongitude;
float flSpeed;
float flHeading;
double dblMagneticVariation;
float flAltitudeWRTSeaLevel;
float flAltitudeWRTEllipsoid;
GPS_FIX_QUALITY FixQuality;
GPS_FIX_TYPE FixType;
GPS_FIX_SELECTION SelectionType;
float flPositionDilutionOfPrecision;
float flHorizontalDilutionOfPrecision;
float flVerticalDilutionOfPrecision;
DWORD dwSatelliteCount;
DWORD rgdwSatellitesUsedPRNs[GPS_MAX_SATELLITES];
DWORD dwSatellitesInView;
DWORD rgdwSatellitesInViewPRNs[GPS_MAX_SATELLITES];
DWORD rgdwSatellitesInViewElevation[GPS_MAX_SATELLITES];
DWORD rgdwSatellitesInViewAzimuth[GPS_MAX_SATELLITES];
DWORD rgdwSatellitesInViewSignalToNoiseRatio[GPS_MAX_SATELLITES];
} GPS_POSITION, *PGPS_POSITION;
Click to expand...
Click to collapse
I had a suggestion to create a library from the C# SDK, how difficult would that be? Would it be easier than trying to convert to VB?
Can you help with that?
Thanks for any feedback...
Hey Guys!
I need a little help in Sql Database programming in vb.net!
how can i Connect to 2 Databases and Join their queries?
Code:
Dim SQLcon As SqlCeConnection = Nothing
Dim strPDAPfad As String = AppDir & "\Catalogs\" & Config.QuestionFileName
Const strPDAPasswort As String = ""
SQLcon = New SqlCeConnection("Data Source=" & strPDAPfad & ";" & strPDAPasswort)
SQLcon.Open()
Dim SQLString As String = "SELECT * FROM QUESTIONS WHERE ID = '" & QuestionID & "'"
Dim SQLQuery As SqlCeCommand = New SqlCeCommand(SQLString, SQLcon)
i want to join 2 databases so i can order one table with the help of another!
Just Like I would have one Database with 2 Tables
"SELECT Questions.ID FROM Questions ORDER BY Stats.Wrong DESC"
I think this is not possible to to it directly. You might need to load the data of one into a temp table in the other db and then do the query.
Would be bad I need to do this very often
I will try to find out how to attach both files to an SQL Compact server and try that again
[edit] found nothing!
scilor said:
Hey Guys!
I need a little help in Sql Database programming in vb.net!
how can i Connect to 2 Databases and Join their queries?
Code:
Dim SQLcon As SqlCeConnection = Nothing
Dim strPDAPfad As String = AppDir & "\Catalogs\" & Config.QuestionFileName
Const strPDAPasswort As String = ""
SQLcon = New SqlCeConnection("Data Source=" & strPDAPfad & ";" & strPDAPasswort)
SQLcon.Open()
Dim SQLString As String = "SELECT * FROM QUESTIONS WHERE ID = '" & QuestionID & "'"
Dim SQLQuery As SqlCeCommand = New SqlCeCommand(SQLString, SQLcon)
i want to join 2 databases so i can order one table with the help of another!
Just Like I would have one Database with 2 Tables
"SELECT Questions.ID FROM Questions ORDER BY Stats.Wrong DESC"
Click to expand...
Click to collapse
Dim SQLString As String = "SELECT * FROM tbl1, tbl2 WHERE tbl1.ID = tbl2.ID and tbl1.QuestionID = '" & QuestionID & "'"
Thank you But I want to do this out of 2 Databases not out of 2 Tables!
I have not actually had the need to do so.
But I would check out LINQ, I have a feeling it should be able to do that.
I'll check it for you when I get home (at work at the moment).
LINQ how it works? I only find rare information for it!
how can I use it in VB.net 2008 ?
There is SQL Command named
UNION
which can Combined Identical Structure Database to Combine the Record from Both Table have you tried it
But how can I use that practically, i know in php is that easily because I know the alias of the Database but with my technic
New SqlCeCommand(SQLString, SQLcon)
there only can be one Database Per Connection
LINQ will read all the records from both databases into memory then do the merge join and give you the matched resultset. You could probably do it much better yourself. If you are going to repeat this join often, then for the sake of the user's patience, you should at least try to do it yourself.
If one table is known to be smaller (in KB) than the other, then I would cache that table in a Dictionary<keyColumn, DataRow> construct. Then I would open a data reader on the second table and process each of those rows by referring to the cached version of the first table.
Of course, I assume you have already ruled out the possibility of permanently merging the two databases? That would be the best solution. But perhaps there are two separate applications, to which you do not have the source code, responsible for maintaining these two databases, in which case I fully understand.
I need to Seperate both!
It is for my Driving Licence Trainer. and I want to Seperate Training Files from the Statistics
If one table is known to be smaller (in KB) than the other, then I would cache that table in a Dictionary<keyColumn, DataRow> construct. Then I would open a data reader on the second table and process each of those rows by referring to the cached version of the first table.
Click to expand...
Click to collapse
@ftruter Could you make an Example for using it for sorting?
Rebranded to WP8 Registry Tools from Lumia Registry Modifier
This is a basic registry viewer/editor demonstration using Registry dlls pulled from Nokia xaps within the latest FFUs.
First, a few things to note.
1) This only retrieves values from HKEY_LOCAL_MACHINE
2) It CAN read DWORD values now, but can't write. (Hell you probably won't be able to write ANYWHERE, but the code is there)
Instructions are quite simple.
To Read Values:
1) Put the Registry key in the first box (ex. SOFTWARE\Classes\MIME\Database\Codepage\1254
2) Put the Registry Value in the second box (ex. 1254)
3) Press Get Value.
To Set Values:
1) Put the Registry key in the first box (ex. SOFTWARE\Classes\MIME\Database\Codepage\1254
2) Put the Registry Value in the second box (ex. 1254)
3) Put the new registry value result in the Set Value box.
4) Press Set Value.
This is very very basic, but I wanted to just show off something using what Nokia has provided us.
We can't write dword values unfortunately so hopes of using this to change the MaxUnsignedApp value are lost. This MAY be possible with @GoodDayToDie 's WP8NativeAccess library, but with this it isn't.
In case everyone wondered what that key is... SOFTWARE\Microsoft\DeviceReg\Install
Side load away
Hmm... I get Access Denied in my library on most keys that I've tried to write. If you can write the codepage, that's interesting (generally speaking, HKLM has stronger protections). I'll double-check whether I can write there myself. If not, but you can, then we have an elevated privilege attack vector...
Also, we should see whether the app runs on non-Nokia devices. I suspect that it will, if it works the way I think it does, but in that case it also won't have much in the way of permissions.
Getting DWORDs to work is a good project, I'm sure it's possible (works fine in NativeAccess, incidentally).
EDIT: Any chance you could include the source?
snickler said:
This is a basic registry viewer/editor demonstration using Nokia's Native Registry dll pulled from one of their apps.
First, a few things to note.
1) This only retrieves values from HKEY_LOCAL_MACHINE
2) DWord values aren't supported.
Instructions are quite simple.
To Read Values:
1) Put the Registry key in the first box (ex. SOFTWARE\Classes\MIME\Database\Codepage\1254
2) Put the Registry Value in the second box (ex. 1254)
3) Press Get Value.
To Set Values:
1) Put the Registry key in the first box (ex. SOFTWARE\Classes\MIME\Database\Codepage\1254
2) Put the Registry Value in the second box (ex. 1254)
3) Put the new registry value result in the Set Value box.
4) Press Set Value.
This is very very basic, but I wanted to just show off something using what Nokia has provided us.
This doesn't seem to work with dword values unfortunately so hopes of using this to change the MaxUnsignedApp value are lost. This MAY be possible with @GoodDayToDie 's WP8NativeAccess library, but with this it isn't.
In case everyone wondered what that key is... SOFTWARE\Microsoft\DeviceReg\Install
Side load away
Click to expand...
Click to collapse
atleast its a start.
GoodDayToDie said:
Hmm... I get Access Denied in my library on most keys that I've tried to write. If you can write the codepage, that's interesting (generally speaking, HKLM has stronger protections). I'll double-check whether I can write there myself. If not, but you can, then we have an elevated privilege attack vector...
Also, we should see whether the app runs on non-Nokia devices. I suspect that it will, if it works the way I think it does, but in that case it also won't have much in the way of permissions.
Getting DWORDs to work is a good project, I'm sure it's possible (works fine in NativeAccess, incidentally).
EDIT: Any chance you could include the source?
Click to expand...
Click to collapse
ah yes, sorry about that. Let me load up my laptop
EDIT: Source added.
Hi I found the Registry item
(File path : <ffu>\Windows\Packages\RegistryFiles\SOFTWARE.REG)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\KindMap
where we can set extensions and their types.so is it possible to add a new extension so that it will also be supported and visible in sdcard ?
vivekkalady said:
Hi I found the Registry item
(File path : <ffu>\Windows\Packages\RegistryFiles\SOFTWARE.REG)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\KindMap
where we can set extensions and their types.so is it possible to add a new extension so that it will also be supported and visible in sdcard ?
Click to expand...
Click to collapse
It doesn't support creating new key values, only modifying existing ones. If the data is within one key value and it's able to be read, then it should be able to have things added to it.
EDIT: From what I've seen, what you're trying to do won't be possible with this. Each extension has a different key value.
We may need to start an "interesting registry values" thread here, similar to the one for WP7. Of course, it'll be more interesting if we can actually change any of them.
Oh, and the app works on my ATIV S, just by the way. Need to find some interesting paths to test it on, though.
EDIT: Have you been able to write to *any* values using this? It fails for me every time, but I haven't tried that many yet.
GoodDayToDie said:
We may need to start an "interesting registry values" thread here, similar to the one for WP7. Of course, it'll be more interesting if we can actually change any of them.
Oh, and the app works on my ATIV S, just by the way. Need to find some interesting paths to test it on, though.
EDIT: Have you been able to write to *any* values using this? It fails for me every time, but I haven't tried that many yet.
Click to expand...
Click to collapse
it has failed for me also. The only values I could write to were the ones that corresponded to Nokia. I'll look through the code again and make another update. I'm going to also rebrand it since it works for non Lumia phones.
Interesting about the Nokia paths working. That could be some characteristic of the DLL you use having better permissions or something specific to OEM stuff, but I actually suspect it's just that Nokia didn't bother to lock down the ACLs on their parts of the registry. You can easily adapt the app to my NativeRegistry class to test this, if you want.
Hmm that's a good idea. I just rebranded it to WP8 Registry Modifier. I'll add in your NativeRegistry class to work along with the RegistryRT class to see what comes about.
DWORD support
For DWORD support, take a look at the Nokia.SilentInstaller.Runtime.wim... The "CSilentInstallerRuntime" class contains multiple methods to interact with the registry including:
CreateKey
GetRegDWORDValue
GetRegSZValue
GetRegSZValueL
IsRegistryDWORDValueExists
IsRegistryKeyExists
IsRegistryREGSZValueExists
SetRegDWORDValue
SetRegSZValue
A bit off topic, I found a way to launch any URI... Literally, ANY URI (app:// http:// or anything). I can launch any application (using the GUID - so it must be a registered application but doesn't have to be one that you see in your programs list) and go to a specific page within that application. I can also pass any kind of query string that could unlock some hidden features in an application (such as the Extras+Info application - I can launch it using any dial string even though my ROM has that particular dial string disabled). I do so by launching a Toast message which allows me specify a launch uri and once it pops up, I click it. If anyone's interested, I can post a code sample for that...
@GoodDayToDie I'm able to read DWORDs with your NativeRegistry framework. I haven't been able to write though (I've only looked at the MaxUnsignedApp reg value).
What I think I'm going to do is possibly scrap the RegistryRT framework and just use yours. I can then make an even more robust app.
cpuguy said:
For DWORD support, take a look at the Nokia.SilentInstaller.Runtime.wim... The "CSilentInstallerRuntime" class contains multiple methods to interact with the registry including:
CreateKey
GetRegDWORDValue
GetRegSZValue
GetRegSZValueL
IsRegistryDWORDValueExists
IsRegistryKeyExists
IsRegistryREGSZValueExists
SetRegDWORDValue
SetRegSZValue
A bit off topic, I found a way to launch any URI... Literally, ANY URI (app:// http:// or anything). I can launch any application (using the GUID - so it must be a registered application but doesn't have to be one that you see in your programs list) and go to a specific page within that application. I can also pass any kind of query string that could unlock some hidden features in an application (such as the Extras+Info application - I can launch it using any dial string even though my ROM has that particular dial string disabled). I do so by launching a Toast message which allows me specify a launch uri and once it pops up, I click it. If anyone's interested, I can post a code sample for that...
Click to expand...
Click to collapse
I was actually looking at the SilentInstaller not long ago. I got sidetracked by the fact that I could use the NativeRegistry read DWORD values. I'll check that out and upload a new build in a few
GoodDayToDie said:
We may need to start an "interesting registry values" thread here, similar to the one for WP7. Of course, it'll be more interesting if we can actually change any of them..
Click to expand...
Click to collapse
I can write one up later. I have several registry keys that I'd like to bring attention to.
NOTE: I don't see anything editable yet, at least I can read it to compare it to the files in the ffu.
Launching a URI should be possible more directly than that, using ShellExecute, or similar, but that way is cool (and doesn't require importing unofficial native functionality).
Just a word of warning: NativeRegistry is under heavy modification. I hope to have the next Alpha release done soon, which brings a ton of changes, but in the meantime you might want to follow the changes on CodePlex; while I test every build that I push, I don't always publish the binaries.
There will be two ways to use the registry through NativeAccess soon: one is to use fairly thin wrappers around the native functions (that's mostly what's implemented now, but it will be expanded to include key and value enumeration, key creation, etc.), and the other is to use a class more akin to a .NET RegistryKey class, offering the ability to interact in a more object-oriented manner (where the object itself represents an open key).
Something I did notice when I tried to compile the NativeRegistry source (I just ended up using the binary you had for my testing) is that it kept blowing up on the include for WinReg.h. I don't have that anywhere. Am I missing something?
snickler said:
Something I did notice when I tried to compile the NativeRegistry source (I just ended up using the binary you had for my testing) is that it kept blowing up on the include for WinReg.h. I don't have that anywhere. Am I missing something?
Click to expand...
Click to collapse
I'm not sure how GoodDayToDie did it himself (probably same approach I take it) but I compiled it using the "WinReg.h" from the Windows 8 SDK and removing the desktop-only compiler "if" instruction (lines 49 and 1446). And like he mentioned, you also have to create the KERNALBASE.LIB with the required registry export functions for the linker.
cpuguy said:
I'm not sure how GoodDayToDie did it himself (probably same approach I take it) but I compiled it using the "WinReg.h" from the Windows 8 SDK and removing the desktop-only compiler "if" instruction (lines 49 and 1446). And like he mentioned, you also have to create the KERNALBASE.LIB with the required registry export functions for the linker.
Click to expand...
Click to collapse
Ah ok, thanks!
cpuguy said:
A bit off topic, I found a way to launch any URI... Literally, ANY URI (app:// http:// or anything). I can launch any application (using the GUID - so it must be a registered application but doesn't have to be one that you see in your programs list) and go to a specific page within that application. I can also pass any kind of query string that could unlock some hidden features in an application (such as the Extras+Info application - I can launch it using any dial string even though my ROM has that particular dial string disabled). I do so by launching a Toast message which allows me specify a launch uri and once it pops up, I click it. If anyone's interested, I can post a code sample for that...
Click to expand...
Click to collapse
Yes, please post your code and give yourself your own thread (at least keep it here in development ). There are a lot of underlying dialer codes that Nokia disabled when flashing the 928s. Also this could mean we could have a custom app launcher, if you wanted to customize it that way. Most of the work we have done on WP8 has occurred in the past few months; we are finally getting so close to the first InteropUnlock for Nokia/WP8.
Sent from my RM-860 (Lumia 928) using the OFFICIAL Tapatalk app.
I'm trying to figure out the correct method prototype (since this is a method that appears to be WinPhone only and isn't part of the SDK so, no details on it whatsoever)... I stumbled upon this toast functionality in "NokiaFrameworkOBAWinPRT.dll" under the "DevPropHelper" class. The method to call is "InvokeToast". This method ends up calling "Shell_PostMessageToast" in "ShellChromeAPI.dll" (this is what I'm trying to invoke directly without going through the Nokia dll).
Add a reference in your project to "NokiaFrameworkOBAWinPRT.winmd" (you can find this in newer versions of the Extras+Info app)
Add the necessary <InProcessServer> tag (to allow the "NokiaFrameworkOBAWinPRT.DevPropHelper" class) in the <ActivatableClasses> section of you WMAppManifest.xml file
In the code... Create an instance of "NokiaFrameworkOBAWinPRT.DevPropHelper"
In the code... Call the "InvokeToast" method (of the previously created object) passing it:
Application GUID (can be your local app's GUID - doesn't seem to matter)
URI to launch in string format
Toast title (can be anything)
Toast content(can be anything)
When the Toast notification pops up, click on it and that's it.