Hello all,
I am using Qt on windows platform.
i want to get and display
vendor id and product id of a plugged usb device from my local system.
Below is my full source code to get the
vendor id and product id from the usb device.
when i run the my qt application it does not throw me any errors .
so i plug the usb device into the system.
but my print statement displays the result as below
qDebug ()<DevicePath;
i get the result as 0x4
Whether i have any implementation mistakes
in my source code ?
if so please guide me what i am doing wrong..
Have i missed out any other functions ?
Is it possible to get the
vendor id and product id from the usb device based on my source code .( my implementation of the code ) ?
kindly find my source code below
static GUID GUID_DEVINTERFACE_USB_DEVICE = { 0xA5DCBF10L, 0x6530, 0x11D2, { 0x90, 0x1F, 0x00, 0xC0, 0x4F, 0xB9, 0x51, 0xED } };
HANDLE hInfo = SetupDiGetClassDevs(&GUID_DEVINTERFACE_USB_DEVICE,NULL,NULL,DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);
if ( hInfo == INVALID_HANDLE_VALUE )
{
qDebug ()<<"invalid";
}
else
{
qDebug ()<<"valid handle";
SP_DEVINFO_DATA DeviceInfoData;
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
SP_INTERFACE_DEVICE_DATA Interface_Info;
Interface_Info.cbSize = sizeof(Interface_Info);
BYTE Buf[1024];
DWORD i;
DWORD InterfaceNumber= 0;
PSP_DEVICE_INTERFACE_DETAIL_DATA pspdidd = (PSP_DEVICE_INTERFACE_DETAIL_DATA)Buf;
for (i=0;SetupDiEnumDeviceInfo(hInfo,i,&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
while (!SetupDiGetDeviceRegistryProperty( hInfo,&DeviceInfoData,SPDRP_DEVICEDESC,&DataT,(PBYTE)buffer,buffersize,&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);
}
else
{
// Insert error handling here.
break;
}
qDebug ()<<(TEXT("Device Number %i is: %s\n"),i, buffer);
if (buffer) LocalFree(buffer);
if ( GetLastError()!=NO_ERROR && GetLastError()!=ERROR_NO_MORE_ITEMS )
{
// Insert error handling here.
qDebug ()<<"return false";
}
InterfaceNumber = 0; // this just returns the first one, you can iterate on this
if (SetupDiEnumDeviceInterfaces(hInfo,NULL,&GUID_DEVINTERFACE_USB_DEVICE,InterfaceNumber,&Interface_Info))
{
printf("Got interface");
DWORD needed;
pspdidd->cbSize = sizeof(*pspdidd);
SP_DEVICE_INTERFACE_DETAIL_DATA *pDetData = NULL;
DWORD dwDetDataSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA) + 256;
SetupDiGetDeviceInterfaceDetail(hInfo, &Interface_Info, pDetData,dwDetDataSize, NULL,&DeviceInfoData);
qDebug ()<<pDetData->DevicePath;
//qDebug ()<<QString::fromWCharArray(pDetData->DevicePath);
}
else
{
printf("\nNo interface");
//ErrorExit((LPTSTR) "SetupDiEnumDeviceInterfaces");
if ( GetLastError() == ERROR_NO_MORE_ITEMS) printf(", since there are no more items found.");
else printf(", unknown reason.");
}
// Cleanup
SetupDiDestroyDeviceInfoList(hInfo);
qDebug ()<<"return true";
}
}
}
