Comments by Coder Block (Top 104 by date)

Genuies...

I dont why du[DE] edit code.not fair.

hey thanks for reply but ..
even
HIDD_ATTRIBUTES Attributes;
DWORD DeviceUsage;
SP_DEVICE_INTERFACE_DATA devInfoData;
bool LastDevice = FALSE;
int MemberIndex = 0;
LONG Result;
CString UsageDescription;

Length = 0;
detailData = NULL;
DeviceHandle=NULL;

/*
API function: HidD_GetHidGuid
Get the GUID for all system HIDs.
Returns: the GUID in HidGuid.
*/

HidD_GetHidGuid(&HidGuid);

/*
API function: SetupDiGetClassDevs
Returns: a handle to a device information set for all installed devices.
Requires: the GUID returned by GetHidGuid.
*/

hDevInfo=SetupDiGetClassDevs
(&HidGuid,
NULL,
NULL,
DIGCF_PRESENT|DIGCF_INTERFACEDEVICE);

HDEVINFO hDeviceList = SetupDiGetClassDevs (&HidGuid,NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

//HDEVINFO hDeviceList = SetupDiGetClassDevs (&KSCATEGORY_TOPOLOGY,NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);


devInfoData.cbSize = sizeof(devInfoData);



//Step through the available devices looking for the one we want.
//Quit on detecting the desired device or checking all available devices without success.

MemberIndex = 0;
LastDevice = FALSE;

_SP_DEVINFO_DATA _info;
ZeroMemory(&_info,sizeof(SP_DEVINFO_DATA));
_info.cbSize = sizeof(SP_DEVINFO_DATA);
int nIndex = 0;
while (SetupDiEnumDeviceInfo (hDeviceList, nIndex++, &_info))
{
do
{
/*
API function: SetupDiEnumDeviceInterfaces
On return, MyDeviceInterfaceData contains the handle to a
SP_DEVICE_INTERFACE_DATA structure for a detected device.
Requires:
The DeviceInfoSet returned in SetupDiGetClassDevs.
The HidGuid returned in GetHidGuid.
An index to specify a device.
*/

Result=SetupDiEnumDeviceInterfaces
(hDevInfo,
0,
&HidGuid,
MemberIndex,
&devInfoData);
if (Result != 0)
{
//A device has been detected, so get more information about it.

/*
API function: SetupDiGetDeviceInterfaceDetail
Returns: an SP_DEVICE_INTERFACE_DETAIL_DATA structure
containing information about a device.
To retrieve the information, call this function twice.
The first time returns the size of the structure in Length.
The second time returns a pointer to the data in DeviceInfoSet.
Requires:
A DeviceInfoSet returned by SetupDiGetClassDevs
The SP_DEVICE_INTERFACE_DATA structure returned by SetupDiEnumDeviceInterfaces.

The final parameter is an optional pointer to an SP_DEV_INFO_DATA structure.
This application doesn't retrieve or use the structure.
If retrieving the structure, set
MyDeviceInfoData.cbSize = length of MyDeviceInfoData.
and pass the structure's address.
*/

//Get the Length value.
//The call will return with a "buffer too small" error which can be ignored.

Result = SetupDiGetDeviceInterfaceDetail
(hDevInfo,
&devInfoData,
NULL,
0,
&Length,
NULL);

//Allocate memory for the hDevInfo structure, using the returned Length.

detailData = (PSP_DEVICE_INTERFACE_DETAIL_DATA)malloc(Length);

//Set cbSize in the detailData structure.

detailData -> cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);

//Call the function again, this time passing it the returned buffer size.

Result = SetupDiGetDeviceInterfaceDetail
(hDevInfo,
&devInfoData,
detailData,
Length,
&Required,
NULL);

// Open a handle to the device.
// To enable retrieving information about a system mouse or keyboard,
// don't request Read or Write access for this handle.

/*
API function: CreateFile
Returns: a handle that enables reading and writing to the device.
Requires:
The DevicePath in the detailData structure
returned by SetupDiGetDeviceInterfaceDetail.
*/

DeviceHandle=CreateFile
(detailData->DevicePath,
0,
FILE_SHARE_READ|FILE_SHARE_WRITE,
(LPSECURITY_ATTRIBUTES)NULL,
OPEN_EXISTI

Hey is WDK (Window Driver Kit)is useful while communicating USB device.
i can communincate with USB port using same but,
while using it..
Now i got problem ,
Result=SetupDiEnumDeviceInterfaces
(hDevInfo,
0,
&HidGuid,
MemberIndex,
&devInfoData);
DWORD Error = GetLastError();
where this function return 0 which is invalide and GetLastError() returns 259
please give me little hint why this is happening.

k