Problem on getting the vendor id and product id of a usb device
- by new
Hi...
my application comes and prints this
"\?\usb#vid_04f2&pid_0111#5&1ba5a77f&0&2#{a5dcbf1 0-6530-11d2-901f-00c04fb951ed}"
again it goes to while loop ....
here it gets breaked in the else statement...
Qt Code:
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);
}
else
{
qDebug ()<<"Here it quits the application";
// Insert error handling here.
break;
}
Any ideas in this....
full source code comes here
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;
pDetData = (SP_DEVICE_INTERFACE_DETAIL_DATA*) malloc (dwDetDataSize);
pDetData->cbSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA);
SetupDiGetDeviceInterfaceDetail(hInfo,&Interface_Info,
pDetData,dwDetDataSize, NULL,&DeviceInfoData);
qDebug ()<<pDetData->DevicePath;
qDebug ()<<QString::fromWCharArray(pDetData->DevicePath);
free(pDetData);
}
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);
}
}
}
