The Usb programm

[yogishgowda]

Hi Debasisdas

The following is the way i have tried
DEFINE_GUID(USBIODS_GUID,0x1f537664, 0x37a9, 0x48c1, 0x96, 0xe7, 0x1a, 0x8a, 0x18, 0x48, 0x41, 0xfd);
// {1F537664-37A9-48c1-96E7-1A8A184841FD}



HDEVINFO hInfo = SetupDiGetClassDevs((struct _GUID *)&USBIODS_GUID, NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);

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

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


if (!SetupDiEnumInterfaceDevice(hInfo, NULL, (LPGUID)
&USBIODS_GUID,i, &Interface_Info))
{
SetupDiDestroyDeviceInfoList(hInfo);
return(i);
}

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

PSP_INTERFACE_DEVICE_DETAIL_DATA detail = (PSP_INTERFACE_DEVICE_DETAIL_DATA) malloc(needed);
if (!detail)
{
SetupDiDestroyDeviceInfoList(hInfo);
return(i);
}

detail->cbSize =
sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
if (!SetupDiGetInterfaceDeviceDetail(hInfo,&Interface _Info,detail, needed,NULL, NULL))
{
free((PVOID) detail);
SetupDiDestroyDeviceInfoList(hInfo);
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 (!SetupDiEnumInterfaceDevice(hInfo, 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
InterfaceClassGuid {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