How to get vendor id and product id of a USB device on windows system

[squidge]

Device Manager and right click the device. Windows will show you the VID and PID of the device so you can compare.

But the above seems incorrect.

What are you trying to do exactly? If it's to notice when a device is inserted or removed, there is buildin APIs for this and you will then get a message telling you when a device is inserted or removed - no need to do it yourself. Eg. Look at WM_DEVICECHANGE

[newb]

To be specific , my application has to display the vendor id and product id of a usb device

Any suggestions on this...

[squidge]

I'd start with SetupDiGetClassDevs()

[newb]

Thank you fatjuicymole for your reply.

i did tried that do .

below is the code i tried.

HANDLE h = SetupDiGetClassDevs(&GUID_CLASS_COMPORT,NULL,NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);

if ( h == INVALID_HANDLE_VALUE )
{
qDebug ()<<"invalid";
}
else
{
qDebug ()<<"valid handle";

qDebug ()<<h;


}
Handle is valid .

can you please lead me further to proceed.

Sorry to be annoying because i am very to new Qt and windows programming

Thank you for your time.

[squidge]

So your only looking for serial ports?

[newb]

For the usb device i need to get the device informations

Any helps please

[squidge]

The code you have written above will only get devices of type 'serial port'. Is that what you want?

[schnitzel]

does the manufacturer of that particular device you are interested in provide some sort of API?
For example FTDI provides an API free of charge for their USB devices.

[newb]

Hello fatjuicymole...

please find my code

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";

qDebug ()<<hInfo;


}

SP_DEVINFO_DATA DeviceInfoData;

DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);

SP_INTERFACE_DEVICE_DATA Interface_Info;

Interface_Info.cbSize = sizeof(Interface_Info);

//
DWORD i;

DWORD InterfaceNumber= 0;

for (i=0;SetupDiEnumDeviceInfo(hInfo,i,&DeviceInfoData );i++)
{
DWORD DataT;

LPTSTR buffer = NULL;

DWORD buffersize = 0;

while (!SetupDiGetDeviceRegistryProperty( hInfo,&DeviceInfoData,SPDRP_DEVICEDESC,&DataT,(PBY TE)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 ()<<"hhhh";

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

//DeviceInterfaceData.cbSize = sizeof(DeviceInterfaceData);

if (SetupDiEnumDeviceInterfaces(hInfo,NULL,&GUID_DEVI NTERFACE_USB_DEVICE,InterfaceNumber,&Interface_Inf o))
{

printf("\nGot interface");

DWORD needed;

h = SetupDiGetDeviceInterfaceDetail(hInfo, &Interface_Info, NULL, 0, &needed,&DeviceInfoData);





//qDebug ()<<Interface_Info.InterfaceClassGuid;




}




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";









//
}
}


Does this code seem correct?

i dont know how to get the information from the device

please lead me further..

Thank you

[squidge]

Once you have SetupDiGetDeviceInterfaceDetail working ok, you have the vid and pid already

However, you are saying you don't want the information as your passing NULL to that function.

[newb]

can you please provide me some leads to proceed further please.

i am stuck on this fuctionality.you may save me from this problem.

Looking for your guidence

Thank you for your time

[squidge]

eg:

SP_DEVICE_INTERFACE_DETAIL_DATA *pDetData = NULL;
DWORD dwDetDataSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA) + 256;
 
pDetData = (_SP_DEVICE_INTERFACE_DETAIL_DATA_A*) malloc (dwDetDataSize);
pDetData->cbSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA);
bOk = SetupDiGetDeviceInterfaceDetail (hDevInfo, &ifcData, pDetData, dwDetDataSize, NULL, &devdata);

SP_DEVICE_INTERFACE_DETAIL_DATA *pDetData = NULL;
DWORD dwDetDataSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA) + 256;

pDetData = (_SP_DEVICE_INTERFACE_DETAIL_DATA_A*) malloc (dwDetDataSize);
pDetData->cbSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA);
bOk = SetupDiGetDeviceInterfaceDetail (hDevInfo, &ifcData, pDetData, dwDetDataSize, NULL, &devdata);

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pDetData->DevicePath contains VID and PID in string form (eg. VID_xxxx&PID_xxxx), or you can use HidD_GetAttributes function in HID.DLL to extract these to a structure:

typedef struct _HIDD_ATTRIBUTES {
ULONG Size;
USHORT VendorID;
USHORT ProductID;
USHORT VersionNumber;
} HIDD_ATTRIBUTES, *PHIDD_ATTRIBUTES;