how to filter Imaging devices like com port in vc++

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VS2008

Visual-Studio

MFC

, +

I want to filter imaging devices(Logiteck Camera etc in system present) like com port.
My code is

C++

int CWin2Dlg::ScanAll(void)
{
	SP_DEVINFO_DATA			devInfo;
	HDEVINFO			devs;
	DWORD   devIndex=0,		nr;
	char				cMyBuf[512];
   devs    = SetupDiGetClassDevs(0, 0, 0, DIGCF_PRESENT | DIGCF_ALLCLASSES | DIGCF_PROFILE );
	if(devs == INVALID_HANDLE_VALUE) return(-1);
	devInfo.cbSize = sizeof(devInfo);
	for(devIndex = 0; SetupDiEnumDeviceInfo(devs, devIndex, &devInfo); devIndex++)
	{
		memset(cMyBuf,0,sizeof(cMyBuf));
		SetupDiGetDeviceRegistryPropertyA(devs, &devInfo, SPDRP_FRIENDLYNAME, 0, (BYTE*)cMyBuf, sizeof(cMyBuf), &nr);
		//if(strlen(cMyBuf) != NULL)
		if(strstr(cMyBuf,"COM"))      // <<====== Filter only COMPORTS
			pComboBox.AddString(cMyBuf);
	}

	SetupDiDestroyDeviceInfoList(devs);
	return 0;
}

Posted 18-Dec-12 0:29am

Member 7909353

Updated 18-Dec-12 0:38am

v2

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Richard MacCutchan 18-Dec-12 6:51am

OK, what's your question?

1 solution

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Jochen Arndt · Accepted Answer · 2012-12-18T00:54:00

You did not tell us the problem. But with SetupDiEnumDeviceInfo(), you must check the return value and call GetLastError() to detect when no more items are available:

C++

BOOL bResult = TRUE; // (devs != INVALID_HANDLE_VALUE);
while (bResult)
{
    bResult = SetupDiEnumDeviceInfo(devs, devIndex++, &devInfo);
    if (!bResult)
    {
        if (ERROR_NO_MORE_ITEMS == GetLastError())
            bResult = TRUE;
        break;
    }
    // get property here
}

To check for specific device types, you must pass a GUID to SetupDiGetClassDevs():

C++

const GUID GUID_DEVINTERFACE_IMAGING = { 
    0x6bdd1fc6, 0x810f, 0x11d0, { 0xbe, 0xc7, 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f }
};
devs = SetupDiGetClassDevs(&GUID_DEVINTERFACE_IMAGING, 0, 0, DIGCF_PRESENT | DIGCF_INTERFACE | DIGCF_PROFILE );

See System-Defined Device Setup Classes Available[^] in the MSDN for GUIDs.