DriverStudio 和 WDF驱动 通过GUID获取设备句柄的差别

DriverStudio

/*****************************************************************************

* 功能： 通过GUID打开设备，获得设备句柄

* 参数： 

*****************************************************************************/

HANDLE lOpenByInterface(

  GUID* pClassGuid, // points to the GUID that identifies the interface class

  DWORD instance,  // specifies which instance of the enumerated devices to open

  PDWORD pError  // address of variable to receive error status

  )

{

 HANDLE hDev=0;

 

 CDeviceInterfaceClass DevClass(pClassGuid, pError);

if (*pError != ERROR_SUCCESS)

  return INVALID_HANDLE_VALUE;

CDeviceInterface DevInterface(&DevClass, instance, pError);

if (*pError != ERROR_SUCCESS)

  return INVALID_HANDLE_VALUE;

hDev = CreateFile(

  DevInterface.DevicePath(),

  GENERIC_READ | GENERIC_WRITE,

  FILE_SHARE_READ | FILE_SHARE_WRITE,

  NULL,

  OPEN_EXISTING,

  FILE_ATTRIBUTE_NORMAL,

  NULL

  );

if (hDev == INVALID_HANDLE_VALUE)

  *pError = GetLastError();

 

 return hDev;

}

//WDF驱动

HANDLE CxDriverInterface::SetupDevInterfaces(DWORD dev_interface_index, int board_type)

{

 HANDLE hd_invalid = INVALID_HANDLE_VALUE;

 DWORD required_buf_size;

 GUID *pGuid = (LPGUID)&GUID_DEVINTERFACE_ATHENA;

if ( board_type == Athena_EVK )

 {

  pGuid = (LPGUID)&GUID_DEVINTERFACE_ATHENA;

 }

 else if( (board_type == Atlas_Plus_EVK) || (board_type == Atlas_EVK) )

 {

  pGuid = (LPGUID)&GUID_DEVINTERFACE_ATLAS;

 }

//Get handle to our device information set that contains requested device information elements

 HDEVINFO devInfoSetHandle = SetupDiGetClassDevs(pGuid, NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);

 if ( devInfoSetHandle == INVALID_HANDLE_VALUE )

 {

  TRACE("SetupDiGetClassDevs failed to find device GUID in system! \n");

  return hd_invalid;

 }

SP_INTERFACE_DEVICE_DATA devInterfaceInfo;

 devInterfaceInfo.cbSize = sizeof(devInterfaceInfo);

// Try to enumerate the device interfaces that are contained in device information set just retrieved

 if( !SetupDiEnumDeviceInterfaces( devInfoSetHandle, NULL, pGuid, dev_interface_index, &devInterfaceInfo ) )

 {

  TRACE("SetupDiEnumDeviceInterfaces failed to enumerate device GUID! \n");

  SetupDiDestroyDeviceInfoList(devInfoSetHandle);

  return hd_invalid;

 }

// Get the required buffer size and allocate proper sized buffer

 SetupDiGetDeviceInterfaceDetail( devInfoSetHandle, &devInterfaceInfo, NULL, 0, &required_buf_size, NULL );

 PSP_INTERFACE_DEVICE_DETAIL_DATA devInterfaceDetail = (PSP_INTERFACE_DEVICE_DETAIL_DATA) malloc (required_buf_size);

if( devInterfaceDetail == NULL )

 {

  TRACE("SetupDiGetDeviceInterfaceDetail failed! \n");

  SetupDiDestroyDeviceInfoList( devInfoSetHandle );

  return hd_invalid;

 }

// Get details for the device interface

 devInterfaceDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);

 if( !SetupDiGetDeviceInterfaceDetail( devInfoSetHandle, &devInterfaceInfo, devInterfaceDetail, required_buf_size, NULL, NULL) )

 {

  TRACE("SetupDiGetDeviceInterfaceDetail failed to set SP_INTERFACE_DEVICE_DETAIL_DATA! \n");

  SetupDiDestroyDeviceInfoList( devInfoSetHandle );

  delete devInterfaceDetail;

  return hd_invalid;

 }

 //前面这部分在Driverworks中用两个类来完成

 // Get device handle

 LPCWSTR dev_path = devInterfaceDetail->DevicePath;

 HANDLE dev_hd = CreateFile( devInterfaceDetail->DevicePath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

if( dev_hd == INVALID_HANDLE_VALUE )

 {

  TRACE("Failed to create device handleB!");

  exit(1);

 }

delete devInterfaceDetail;

if ( devInfoSetHandle )

  SetupDiDestroyDeviceInfoList( devInfoSetHandle );

return dev_hd;

}