Database Users

Bluetooth Programming...

This is for the C/C++ developers out here...
i need to connect a PocketPC to a PC via Bluetooth. Looking at various samples from the Windows Platform SDK and the Windows Mobile SDKs, i came up with the following server (PC) and client (PDA) codes:
Server Code (WinXP):
Code:
WSAData wsaData;
SOCKADDR_BTH sa;
int namelen;
SOCKET sock;
SOCKADDR_BTH sockaddr;
int size = sizeof(sockaddr);
if (WSAStartup(MAKEWORD(2, 2), &wsaData) == SOCKET_ERROR)
return false;
BluetoothHost_Socket = socket(AF_BTH, SOCK_STREAM, BTHPROTO_RFCOMM);
if (BluetoothHost_Socket == INVALID_SOCKET)
return false;
memset (&sa, 0, sizeof(sa));
sa.addressFamily = AF_BTH;
sa.port = 0;
if (bind(BluetoothHost_Socket, (SOCKADDR *) &sa, sizeof(sa)))
{
closesocket(BluetoothHost_Socket);
return false;
namelen = sizeof(sa);
if (getsockname(BluetoothHost_Socket, (SOCKADDR *)&sa, &namelen))
{
closesocket (BluetoothHost_Socket);
return false;
}
BluetoothHost_ClientListCount = 0;
if (listen(BluetoothHost_Socket, 5))
return false;
sock = accept(BluetoothHost_Socket, (SOCKADDR *) &sockaddr, &size);
}
Client Code (WinCE):
Code:
WSAQUERYSET querySet;
HANDLE hLookup;
char buffer[1000];
DWORD bufferlength;
WSAQUERYSET *results;
SOCKADDR_BTH *btaddr;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) == SOCKET_ERROR)
return false;
memset(&querySet, 0, sizeof(querySet));
querySet.dwSize = sizeof(querySet);
querySet.dwNameSpace = NS_BTH;
BluetoothQuery_DeviceCount = 0;
if (WSALookupServiceBegin(&querySet, LUP_CONTAINERS, &hLookup) == SOCKET_ERROR)
return false;
while (BluetoothQuery_DeviceCount < BLUETOOTHQUERY_MAXDEVICES && !BluetoothQuery_Cancel)
{
bufferlength = sizeof(buffer);
memset(buffer, 0, sizeof(buffer));
results = (WSAQUERYSET *) &buffer;
if (WSALookupServiceNext(hLookup, LUP_RETURN_NAME|LUP_RETURN_ADDR, &bufferlength, results) == SOCKET_ERROR)
{
int result = WSAGetLastError();
break;
}
btaddr = (SOCKADDR_BTH*)results->lpcsaBuffer->RemoteAddr.lpSockaddr;
BluetoothQuery_DeviceAddrList[BluetoothQuery_DeviceCount]=btaddr->btAddr;
if (results->lpszServiceInstanceName != NULL)
wcscpy((TCHAR *)BluetoothQuery_DeviceNameList[BluetoothQuery_DeviceCount],results->lpszServiceInstanceName);
else
wcscpy((TCHAR *)BluetoothQuery_DeviceNameList[BluetoothQuery_DeviceCount],L"<unnamed>");
BluetoothQuery_DeviceCount++;
}
WSALookupServiceEnd(hLookup);
BluetoothClient_Socket = socket (AF_BT, SOCK_STREAM, BTHPROTO_RFCOMM);
if (BluetoothClient_Socket == INVALID_SOCKET)
return false;
SOCKADDR_BTH sa;
memset (&sa, 0, sizeof(sa));
sa.addressFamily = AF_BT;
sa.btAddr = *btaddr;
for (i = 0; i < 30; i++)
{
sa.port = i; //channel & 0xff;
if (connect(BluetoothClient_Socket, (SOCKADDR *) &sa, sizeof(sa)) == 0)
break;
}
if (i >= 30)
{
closesocket(BluetoothClient_Socket);
return false;
}
All calls seems to work out. Sockets are created, all return values look ok. Yet, the client does not connect to the server, so the server never goes beyong that accept() call.
Any comments would be greatly appreciated!
thanks,
Daniel

VOIP: Switching between Speaker and Earpiece During Active Call

Hi All,
I am developing a VOIP application for Windows Mobile. I want the user to switch the between the Speaker and Earpiece of the Mobile Phone. I have searched the Forum and found the following link
http://teksoftco.com/forum/viewtopic.php?p=1909
As you know we have to use LoadLibrary and GetProcAddress to access the RIL APIs in Windows Mobile. I have written following piece of code for this i.e.
Code:
HRIL hRIL;
bool speakerphone = true; // false;
HRESULT result = RIL_Initialize(1, ResultCallback, NotifyCallback, RIL_NCLASS_MISC, 0, &hRIL);
if (result != S_OK) {
wchar_t buffer[200];
wsprintf(buffer, L"Could not open RIL, error=0x%x", result);
AfxMessageBox(buffer);
return;
}
RILAUDIODEVICEINFO info;
info.cbSize = sizeof(info);
info.dwParams = RIL_PARAM_ADI_ALL; // RIL_PARAM_ADI_TXDEVICE;
info.dwRxDevice = RIL_AUDIO_HANDSET;
info.dwTxDevice = speakerphone ? RIL_AUDIO_NONE : RIL_AUDIO_HANDSET;
result = RIL_SetAudioDevices(hRIL, &info);
if (result != S_OK) {
wchar_t buffer[200];
wsprintf(buffer, L"Could not open RIL, error=0x%x", result);
AfxMessageBox(buffer);
}
RIL_Deinitialize(hRIL);
But this doesn't seems to work, i.e. some time it causes both the audio input and output to halt, sometime audio input is halted (i.e. no voice is heard on the other end).
I have also tried another techniques to accomplish this task, like:
Technique 2
--------------
Code:
#define MM_WOM_FORCESPEAKER (WM_USER+2)
static void SetSpeakerMode(bool speakerphone)
{
MMRESULT result = waveOutMessage((HWAVEOUT)0, MM_WOM_FORCESPEAKER, speakerphone, 0);
if (result != MMSYSERR_NOERROR) {
wchar_t buffer[200];
wsprintf(buffer, L"Could not do speakerphone switch, error=%u", result);
AfxMessageBox(buffer);
}
}
Technique 3
--------------
Code:
/* Stuff from Wavedev.h */
#define IOCTL_WAV_MESSAGE 0x001d000c
typedef struct {
UINT uDeviceId;
UINT uMsg;
DWORD dwUser;
DWORD dwParam1;
DWORD dwParam2;
} MMDRV_MESSAGE_PARAMS;
/* End of Wavedev.h extract */
class WavDevice
{
private:
HANDLE hWavDev;
public:
WavDevice()
{
hWavDev = CreateFile(TEXT("WAV1:"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hWavDev == INVALID_HANDLE_VALUE) {
wchar_t buffer[200];
wsprintf(buffer, L"Could not open device, error=%u", GetLastError());
AfxMessageBox(buffer);
}
}
~WavDevice()
{
if (hWavDev != INVALID_HANDLE_VALUE)
CloseHandle(hWavDev);
}
bool SendMessage(UINT uMsg, DWORD dwParam1 = 0, DWORD dwParam2 = 0)
{
if (hWavDev == INVALID_HANDLE_VALUE)
return false;
DWORD dwRet = 0, dwOut;
MMDRV_MESSAGE_PARAMS mp;
memset(&mp,0,sizeof(mp));
mp.uMsg = uMsg;
mp.dwParam1 = dwParam1;
mp.dwParam2 = dwParam2;
if (DeviceIoControl(hWavDev, IOCTL_WAV_MESSAGE, &mp, sizeof(mp), &dwOut, sizeof(dwOut), &dwRet, 0))
return true;
wchar_t buffer[200];
wsprintf(buffer, L"Could not do speakerphone switch, error=%u", GetLastError());
AfxMessageBox(buffer);
return false;
}
};
static void SetSpeakerMode(bool speakerphone)
{
WavDevice wd;
if (!wd.SendMessage(1002, speakerphone ? 0 : 2))
return;
if (!wd.SendMessage(1012, speakerphone ? 0 : 1))
return;
if (speakerphone && !wd.SendMessage(1013))
return;
wd.SendMessage(1000, speakerphone ? 2 : 4, speakerphone ? 0 : 7);
}
Technique 4
--------------
Code:
class OsSvcsDll
{
private:
HMODULE hDLL;
typedef HRESULT (* SetSpeakerModeFn)(DWORD mode);
SetSpeakerModeFn pfnSetSpeakerMode;
public:
OsSvcsDll()
{
hDLL = LoadLibrary(L"\\windows\\ossvcs.dll");
if (hDLL == NULL) {
wchar_t buffer[200];
wsprintf(buffer, L"Could not open DLL, error=%u", GetLastError());
AfxMessageBox(buffer);
}
pfnSetSpeakerMode = (SetSpeakerModeFn)GetProcAddress(hDLL, (LPCTSTR)218);
if (pfnSetSpeakerMode == NULL) {
wchar_t buffer[200];
wsprintf(buffer, L"Could not open DLL, error=%u", GetLastError());
AfxMessageBox(buffer);
}
}
~OsSvcsDll()
{
if (hDLL != NULL)
FreeLibrary(hDLL);
}
bool SetSpeakerMode(DWORD speakerphone)
{
if (pfnSetSpeakerMode == NULL)
return false;
HRESULT result = pfnSetSpeakerMode(speakerphone);
if (result == 0)
return true;
wchar_t buffer[200];
wsprintf(buffer, L"Could not do speakerphone switch, error=0x%x", result);
AfxMessageBox(buffer);
return false;
}
};
static void SetSpeakerMode(bool speakerphone)
{
OsSvcsDll dll;
dll.SetSpeakerMode(speakerphone ? 1 : 0);
}
But no procedure seems to work properly.
Can you please guide me where i am going wrong or some other way of achieving this.
I am using
Visual C++ MFC Dialog based Application
Visual Studio 2008
Windows Mobile 6 SDK For PocketPC
I have tested the above mentioned sample on
HTC Touch
Sony Erricsson XPeria
Waiting for response.
Regards,
Ghazanfar Ali
Regards,
Ghazanfar Ali

Send an image over HTTP in C#

Hey all
I have the following function to generate the http headers for a GET request on an image file:
Code:
byte [] headersAndImage()
{
StringBuilder s = new StringBuilder();
s.Append("HTTP/1.1 200 OK\r\n");
s.Append("Date: Tue, 17 Aug 2010 11:40:00 GMT\r\n");
s.Append("Vary: *\r\n");
s.Append("Server: Custommade\r\n");
s.Append("Content-Type: image/jpeg\r\n");
Bitmap b = new Bitmap("\\dog.jpg");
MemoryStream ms = new MemoryStream();
b.Save(ms, ImageFormat.Jpeg );
byte[] bitmapData = ms.ToArray();
ms.Close();
s.Append("Content-Length: " + bitmapData.Length + "\r\n\r\n");
byte[] headers = Encoding.ASCII.GetBytes(s.ToString());
return join(headers,bitmapData);
}
however when a browser receives this http packet the image is never displayed, usually just see the red X.
Any ideas why this won't work?

Here is the code that works for me:
Code:
public void TransmitFile(byte[] file, string fileName)
{
MemoryStream fileStream = new MemoryStream();
fileStream.Write(file, 0, file.Length);
fileStream.Position = 0;
var response = HttpContext.Current.Response;
response.Clear();
response.ClearContent();
response.ClearHeaders();
response.ContentType = @"application/force-download\n";
response.AppendHeader(@"Content-Disposition",
String.Format(@"attachment;filename=""{0}""", fileName));
long bytesToGo;
int bytesRead;
Byte[] buffer = new byte[1048576]; //1 MB buffer, you may want to use whatever fits your environment
bytesToGo = fileStream.Length;
while (bytesToGo > 0)
{
if (response.IsClientConnected)
{
bytesRead = fileStream.Read(buffer, 0, 1048576);
response.OutputStream.Write(buffer, 0, bytesRead);
response.Flush();
bytesToGo -= bytesRead;
if (bytesRead == 0)
{
break; ;
}
}
else
{
bytesToGo = -1;
}
}
fileStream.Close();
response.Flush();
response.End();
}

My JSONArray keeps appending the last object on loop

Here is my code:
Code:
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
JSONObject jObject = new JSONObject(jsonObj.toString().trim());
Iterator<?> keys = jObject.keys();
JSONArray temp_json_arr = null;
JSONObject temp_json_obj = null;
String temp_string = "";
int index_count = 0;
LinearLayout ll = (LinearLayout)findViewById(R.id.test_layout);
//temp_json_obj = jsonObj.getJSONObject("identification");
//Log.d("TEST: ", "ARRAY LENGTH> "+temp_json_arr.length());
while( keys.hasNext() ){
String key = (String)keys.next();
Log.d("TEST: ", "KEYS> " + key);
// Getting JSON Array node
temp_json_arr = jsonObj.getJSONArray(key);
// looping through All Questions
for (int i = 0; i < temp_json_arr.length(); i++) {
JSONObject q = temp_json_arr.getJSONObject(i);
if( key.equals("identification") ) {
tv[tv_ctr] = new TextView(getApplicationContext());
tv[tv_ctr] = (TextView)findViewById(id);
id++;
et[identification_question] = new EditText(getApplicationContext());
et[identification_question] = (EditText)findViewById(id);
id++;
//json manipulation
try {
jsonOb.put("question-id", tv[tv_ctr].getText().toString());
jsonOb.put("answer", et[identification_question].getText().toString());
} catch(Exception e) {
}
Log.d("TEST: ", "jsonOb> " + jsonOb.toString());
//answer += et[identification_question].getText().toString() + "-" + tv[tv_ctr].getText().toString() + "/";
tv_ctr++;
identification_question++;
jsonArr.put(test,jsonOb);
test++;
Log.d("TEST: ", "jsonArr> " + jsonArr.toString());
}
Everytime I use .put of the JSONArray, it appends the last object on all indexes for example:
I have 3 input namely answer 1 , answer 2 and answer 3
The expected json data will be this:
Code:
[{"answer":"answer1","question-id":"question1"},{"answer":"answer2","question-id":"question2"},{"answer":"answer3","question-id":"question3"}]
But this is the current output:
Code:
[{"answer":"answer3","question-id":"question3"},{"answer":"answer3","question-id":"question3"},{"answer":"answer3","question-id":"question3"}]
As you can see the last index get appended multiple times.

Nevermind I've already solved my own problem.

ProcessBuilder.start() with "su" command blocks thread

I'm implementing a terminal "emulator"/"launcher" in my app. I want to let the user to use all android shell commands. This works great, until I use the "su" command. here is the source code:
Code:
ProcessBuilder processBuilder = new ProcessBuilder(input);
processBuilder.directory(info.currentDirectory);
Process process;
try {
process = processBuilder.start();
} catch (IOException e) {
return 1;
}
process.waitFor();
InputStream i = process.getInputStream();
InputStream e = process.getErrorStream();
BufferedReader ir = new BufferedReader(new InputStreamReader(i));
BufferedReader er = new BufferedReader(new InputStreamReader(e));
String s = null;
output = "";
for(int count = 0; count == 0 || s != null; count++) {
s = ir.readLine();
if(s != null) {
if(count == 0)
output = output.concat(mContext.getString(R.string.output_label) + "\n");
output = output.concat(s + "\n");
}
}
s = null;
for(int count = 0; count == 0 || s != null; count++) {
s = er.readLine();
if(s != null) {
if(count == 0)
output = output.concat(mContext.getString(R.string.error_label) + "\n");
output = output.concat(s + "\n");
}
}
process.destroy();
Main thread is blocked forever in any case: if I call only process.waitFor, and if I use one of the InputStream objects.
What's the problem? SU permissions are granted normally...