The Usb programm

[yogishgowda]

Hi Debasisdas

The following is the way i have tried
DEFINE_GUID(USB IODS_GUID,0x1f5 37664, 0x37a9, 0x48c1, 0x96, 0xe7, 0x1a, 0x8a, 0x18, 0x48, 0x41, 0xfd);
// {1F537664-37A9-48c1-96E7-1A8A184841FD}



HDEVINFO hInfo = SetupDiGetClass Devs((struct _GUID *)&USBIODS_GUID , NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACE DEVICE);

int i;
char *Devices[10]; // an array of cstrings
char name[150];
for ( i=0; ; ++i)
{
SP_INTERFACE_DE VICE_DATA Interface_Info;

Interface_Info. cbSize = sizeof(Interfac e_Info);
// Enumerate device


if (!SetupDiEnumIn terfaceDevice(h Info, NULL, (LPGUID)
&USBIODS_GUID,i , &Interface_Info ))
{
SetupDiDestroyD eviceInfoList(h Info);
return(i);
}

DWORD needed; // get the required lenght
SetupDiGetInter faceDeviceDetai l(hInfo, &Interface_Info ,
NULL, 0, &needed, NULL);

PSP_INTERFACE_D EVICE_DETAIL_DA TA detail = (PSP_INTERFACE_ DEVICE_DETAIL_D ATA) malloc(needed);
if (!detail)
{
SetupDiDestroyD eviceInfoList(h Info);
return(i);
}

detail->cbSize =
sizeof(SP_INTER FACE_DEVICE_DET AIL_DATA);
if (!SetupDiGetInt erfaceDeviceDet ail(hInfo,&Inte rface_Info,deta il, needed,NULL, NULL))
{
free((PVOID) detail);
SetupDiDestroyD eviceInfoList(h Info);
return(i);
}

strncpy(name, detail->DevicePath, sizeof(name));
free((PVOID) detail);
strcpy(Devices[i],name); // keep a copy of each device name
printf("%s", name);

}


HANDLE hUsbDevice = CreateFile(name , GENERIC_READ |GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
}

This is the way i have used, kindly suggest any changes to be done for the same as the

if (!SetupDiEnumIn terfaceDevice(h Info, NULL, (LPGUID)
&USBIODS_GUID,i , &Interface_Info ))

is failing and entering the if condition in the code

[debasisdas]

The code is OK but what exactly you are trying to do ?
A brief description of the problem is requested.

[yogishgowda]

The code is OK but what exactly you are trying to do ?
A brief description of the problem is requested.

The purpose of this program is to establish communincation b/n the USB device. Here in the program the blocked if loop is failing and the in the debug condition im getting this result
InterfaceClassG uid {CCCCCCCC-CCCC-CCCC-CCCC-CCCCCCCCCCCC} as this is failing here
and the program returns from this if loop

[yogishgowda]

I hope .. i am missing some initialisation procedure for the devices,
some more info

compiler : VC6++
OS :windows xp