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

[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;

[newb]

Thank you for the replay friend...

qDebug ()<<pDetData->DevicePath;

when i print this i get the below result.

0x4

can you please tell me why i get this result as above

[squidge]

DevicePath will be WCHAR array. You'll need to convert it to something like QString before using qDebug() etc. Or you can pass it to CreateFile, then use HidD_GetAttributes to get the above structure filled in.

[newb]

Thank you for the reply dude...

Below is my full source code to get the vendor id and product id from the usb device.

after i run the my qt application i plug the usb device into the system.

but when i print the pDetData->DevicePath;

qDebug ()<<pDetData->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

Looking for your guidence..

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,(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 ()<<(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_DEVI NTERFACE_USB_DEVICE,InterfaceNumber,&Interface_Inf o))

{

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";



}

}

}

[squidge]

As I said above, the reason is because DevicePath will be WCHAR array.

[newb]

Even when i try to convert it to QString my application gets crashed.

i used like below

qDebug ()<<QString:::fromWCharArray ( pDetData->DevicePath );

Any helps

[squidge]

Yes, because you are still passing a NULL pointer. Read my code fragment again.