USB programming

[bill]

The purpose of this program is to establish communincation b/n the USB device. Here in the program the bolded 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
 
The following is the way i have tried

DEFINE_GUID(USBIODS_GUID,0x1f537664, 0x37a9, 0x48c1, 0x96, 0xe7, 0x1a, 0x8a, 0x18, 0x48, 0x41, 0xfd);<br /> // {1F537664-37A9-48c1-96E7-1A8A184841FD}<br /> <br /> HDEVINFO hInfo = SetupDiGetClassDevs((struct _GUID *)&#038;USBIODS_GUID, NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);<br /> <br /> int i;<br /> char *Devices[10]; // an array of cstrings<br /> char name[150];<br /> for ( i=0; ; ++i)<br /> {<br /> SP_INTERFACE_DEVICE_DATA Interface_Info;<br /> <br /> Interface_Info.cbSize = sizeof(Interface_Info);<br /> // Enumerate device<br /> <br /> <br /> if (!SetupDiEnumInterfaceDevice(hInfo, NULL, (LPGUID)<br /> &#038;USBIODS_GUID,i, &#038;Interface_Info))<br /> {<br /> SetupDiDestroyDeviceInfoList(hInfo);<br /> return(i);<br /> }<br /> <br /> DWORD needed; // get the required lenght<br /> SetupDiGetInterfaceDeviceDetail(hInfo, &#038;Interface_Info,<br /> NULL, 0, &#038;needed, NULL);<br /> <br /> PSP_INTERFACE_DEVICE_DETAIL_DATA detail = (PSP_INTERFACE_DEVICE_DETAIL_DATA) malloc(needed);<br /> if (!detail)<br /> {<br /> SetupDiDestroyDeviceInfoList(hInfo);<br /> return(i);<br /> }<br /> <br /> detail->cbSize =<br /> sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);<br /> if (!SetupDiGetInterfaceDeviceDetail(hInfo,&#038;Interface_Info,detail, needed,NULL, NULL))<br /> {<br /> free((PVOID) detail);<br /> SetupDiDestroyDeviceInfoList(hInfo);<br /> return(i);<br /> }<br /> strncpy(name, detail->DevicePath, sizeof(name));<br /> free((PVOID) detail);<br /> strcpy(Devices,name); // keep a copy of each device name<br /> printf("%s", name);<br /> }<br /> HANDLE hUsbDevice = CreateFile(name, GENERIC_READ |GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);<br /> }<br /> <br />

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DEFINE_GUID(USBIODS_GUID,0x1f537664, 0x37a9, 0x48c1, 0x96, 0xe7, 0x1a, 0x8a, 0x18, 0x48, 0x41, 0xfd);<br /> // {1F537664-37A9-48c1-96E7-1A8A184841FD}<br /> <br /> HDEVINFO hInfo = SetupDiGetClassDevs((struct _GUID *)&#038;USBIODS_GUID, NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);<br /> <br /> int i;<br /> char *Devices[10]; // an array of cstrings<br /> char name[150];<br /> for ( i=0; ; ++i)<br /> {<br /> SP_INTERFACE_DEVICE_DATA Interface_Info;<br /> <br /> Interface_Info.cbSize = sizeof(Interface_Info);<br /> // Enumerate device<br /> <br /> <br /> if (!SetupDiEnumInterfaceDevice(hInfo, NULL, (LPGUID)<br /> &#038;USBIODS_GUID,i, &#038;Interface_Info))<br /> {<br /> SetupDiDestroyDeviceInfoList(hInfo);<br /> return(i);<br /> }<br /> <br /> DWORD needed; // get the required lenght<br /> SetupDiGetInterfaceDeviceDetail(hInfo, &#038;Interface_Info,<br /> NULL, 0, &#038;needed, NULL);<br /> <br /> PSP_INTERFACE_DEVICE_DETAIL_DATA detail = (PSP_INTERFACE_DEVICE_DETAIL_DATA) malloc(needed);<br /> if (!detail)<br /> {<br /> SetupDiDestroyDeviceInfoList(hInfo);<br /> return(i);<br /> }<br /> <br /> detail->cbSize =<br /> sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);<br /> if (!SetupDiGetInterfaceDeviceDetail(hInfo,&#038;Interface_Info,detail, needed,NULL, NULL))<br /> {<br /> free((PVOID) detail);<br /> SetupDiDestroyDeviceInfoList(hInfo);<br /> return(i);<br /> }<br /> strncpy(name, detail->DevicePath, sizeof(name));<br /> free((PVOID) detail);<br /> strcpy(Devices,name); // keep a copy of each device name<br /> printf("%s", name);<br /> }<br /> HANDLE hUsbDevice = CreateFile(name, GENERIC_READ |GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);<br /> }<br /> <br />

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

if (!SetupDiEnumInterfaceDevice(hInfo, NULL, (LPGUID)<br /> &#038;USBIODS_GUID,i, &#038;Interface_Info))<br />

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if (!SetupDiEnumInterfaceDevice(hInfo, NULL, (LPGUID)<br /> &#038;USBIODS_GUID,i, &#038;Interface_Info))<br />

is failing and entering the if condition in the code

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