Bluetooth Programming [C]

[+John Teacake MVC]

#include <stdlib.h>
#include <stdio.h>
#include <Winsock2.h>
#include <Ws2bth.h>
#include <BluetoothAPIs.h>
#include <windows.h>

void ErrorExit(LPTSTR lpszFunction);

int main(void)
{
	BLUETOOTH_FIND_RADIO_PARAMS FirstRadio;
	HANDLE RadioHandle;
	HANDLE NextRadio;
	BOOL FoundNextRadioHandle;
	BLUETOOTH_RADIO_INFO RadioDeviceInfo;
	DWORD dw;

	BluetoothFindFirstRadio((BLUETOOTH_FIND_RADIO_PARAMS*)&FirstRadio,(HANDLE*)&RadioHandle);
	if(RadioHandle == NULL)
	{
  printf("Problems Creating Radio Handle");
	}

	FoundNextRadioHandle = BluetoothFindNextRadio((HANDLE*)&RadioHandle,(HANDLE*)&NextRadio);

	if(FoundNextRadioHandle == TRUE)
	{
  printf("Found Another Bluetooth Radio");
	}
	else
	{
  printf("Only One Bluetooth Radio Handle Present\n");
  
	}
  
	BluetoothGetRadioInfo(RadioHandle,(BLUETOOTH_RADIO_INFO*)&RadioDeviceInfo);
	dw = GetLastError();
	ErrorExit((LPTSTR)&dw);

	HBLUETOOTH_DEVICE_FIND DeviceHandle;
	BLUETOOTH_DEVICE_INFO DeviceInfo;
	BLUETOOTH_DEVICE_SEARCH_PARAMS SearchParams;

	BOOL FoundDevice; /*Return Value of FindNextDevice*/
	BLUETOOTH_DEVICE_INFO FoundDeviceInfo; /*Structure Containing Info of next Device*/

	SearchParams.dwSize = sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS);
	SearchParams.fReturnAuthenticated = TRUE;
	SearchParams.fReturnRemembered = TRUE;
	SearchParams.fReturnUnknown = TRUE;
	SearchParams.fReturnConnected = TRUE;
	SearchParams.fIssueInquiry = TRUE;
	SearchParams.cTimeoutMultiplier = 10;
	SearchParams.hRadio = RadioHandle;

	BluetoothFindFirstDevice((BLUETOOTH_DEVICE_SEARCH_PARAMS*)&SearchParams,(BLUETOOTH_DEVICE_INFO*)&DeviceInfo);
	dw = GetLastError();
	ErrorExit((LPTSTR)&dw);

	FoundDevice = BluetoothFindNextDevice((HBLUETOOTH_DEVICE_FIND*)&DeviceHandle,(BLUETOOTH_DEVICE_INFO*) &FoundDeviceInfo);
	dw = GetLastError();
	ErrorExit((LPTSTR)&dw);

	return 0;
}

void ErrorExit(LPTSTR lpszFunction) 
{ 
    TCHAR szBuf[80]; 
    LPVOID lpMsgBuf;
    DWORD dw = GetLastError(); 

    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER | 
        FORMAT_MESSAGE_FROM_SYSTEM,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR) &lpMsgBuf,
        0, NULL );

    wsprintf(szBuf, 
        "%s failed with error %d: %s", 
        lpszFunction, dw, lpMsgBuf); 

    MessageBox(NULL, szBuf, "Error", MB_OK); 

    LocalFree(lpMsgBuf);
    ExitProcess(dw); 
}

Hi, Please could someone tell me why this program isnt working. It keeps comming up with the error :

  Quote

Error 126 : The specified module could not be found.

It needs the platform SDK installed for the bluetooth headers and such. It also doesnt find the local bluetooth dongle or my phone which is what it is intended to do.

Thanks in Advance.

Sawyer12 :)

[Andareed]

Which function is causing the error?

[+John Teacake MVC]

Wherever the get last error is called the error is 126 :s.

[Andareed]

If a function succeeds, it is not required to set the last error to 0. You have to check what success means for each function. For example, BluetoothFindFirstDevice is supposed to return a valid handle and fails on NULL - you should check this first. If you have a NULL handle, then call GetLastError.

[+John Teacake MVC]

Can anyone tell me the difference between the functions :

BluetoothFindFirstDevice and BluetoothFindFirstRadio ?

Which should I call first, Im basically trying to get my program to find my bluetooth phone. Any ideas?

[freestyle]

  Sawyer12 said:

Can anyone tell me the difference between the functions :

BluetoothFindFirstDevice and  BluetoothFindFirstRadio ?

Which should I call first, Im basically trying to get my program to find my bluetooth phone. Any ideas?

585348297[/snapback]

I tried the code on 2 dev machines:

Machine 1: Mitsumi Bluetooth Adapter - Got an Error 126

Machine 2: Microsoft Bluetooth Keyboard/Mouse Adapter - Worked no problem

I guess it could be a driver issue.

BluetoothFindfirstDevice, this would find a device like phone, pda, keyboard etc.

BluetoothFindFirstRadio, this would find the actual bluetooth adapter.

[+John Teacake MVC]

Are you sure about that so basically I need to call findfirstradio first to find a bluetooth dongle connected to the laptop for example. then call find first device to find any phones, pdas etc ?

[freestyle]

If you only have the 1 bluetooth adapter installed then you can have the line

 SearchParams.hRadio = NULL;

Then you can delete all the code that deals with BluetoothFindFirstRadio().

But like I said, 1 adapter worked for me, the other didn't... If you are still getting the same error it might be the adapter/api conflict.

[freestyle]

Here is the code that worked for me

#include "bthdef.h"
#include "BluetoothAPIs.h"
#pragma comment(lib, "irprops.lib")

	BLUETOOTH_DEVICE_SEARCH_PARAMS bdsp;
	BLUETOOTH_DEVICE_INFO bdi;
	HBLUETOOTH_DEVICE_FIND hbf;

	ZeroMemory(&bdsp, sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS));

	bdsp.dwSize = sizeof(BLUETOOTH_DEVICE_SEARCH_PARAMS);
	bdsp.fReturnAuthenticated = TRUE;
	bdsp.fReturnRemembered = TRUE;
	bdsp.fReturnUnknown = TRUE;
	bdsp.fReturnConnected = TRUE;
	bdsp.fIssueInquiry = TRUE;
	bdsp.cTimeoutMultiplier = 10;
	bdsp.hRadio = NULL;

	bdi.dwSize = sizeof(bdi);

	hbf = BluetoothFindFirstDevice(&bdsp, &bdi);
	DWORD dwErr = GetLastError();

	if (hbf != NULL)
	{
  TCHAR szDevName[MAX_PATH];

  while(1)
  {
  	memset(szDevName, 0x00, sizeof(szDevName));
  	sprintf(szDevName, _T("Name:%S"), bdi.szName);
  	MessageBox(szDevName, _T("Bluetooth Info"));

  	if (BluetoothFindNextDevice(hbf, &bdi) == FALSE)
    break;
  }

  BluetoothFindDeviceClose(hbf);
	}
	else
	{
  //No Devices Found...
	}

[+John Teacake MVC]

That code works, did you write that yourself ?

[+John Teacake MVC]

So my next question is how do you connect to send and receive data from the device.

[freestyle]

I think that the Microsoft Bluetoothxxx() API functions are only to enumerate, bond, select & get info of bluetooth devices in the area. You may have to use the Winsock functions to actually communicate to the bluetooth device.

I only do WindowsCE programming, and the MS Bluetooth API functions are very different, eg. once you have bonded/selected a device it usually appears as a COM Port, then it is a simple matter of opening/closing/read/write to that port. On WIn32, I don't know.

Some devices like PDA's use OBEX to transfer files, maybe that could be used, maybe not !!!

[likeycila]

is this acceptable?

[ViZioN]

  On 14/05/2010 at 10:46, likeycila said:

is this acceptable?

Bumping a +5 year old thread with no useful information? Unlikely :p