第五篇 如何调用驱动接口，完成互操作

1.  如何调用驱动功能

1    编写调用驱动的应用程序

1.1 定义驱动设备接口，以及调用接口的控制码

例如:

DEFINE_GUID(GUID_DEVINTERFACE_SampleDriver,\

       0xc459a9ec, 0xb463, 0x4838, 0x9a, 0xd5,0xe0, 0x4a, 0x9a, 0xa2, 0xc4, 0xbe);

 

#define CharSample_IOCTL_800 CTL_CODE(FILE_DEVICE_UNKNOWN,0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)

 

其中GUID_DEVINTERFACE_SampleDriver,就是创建设备时，定义的设备接口。CharSample_IOCTL_800就是定义设备控制事件队列的

1.2 通过设备接口查询设备路径

PCHAR

GetDevicePath(

    IN LPGUID InterfaceGuid

    )

{

    HDEVINFO HardwareDeviceInfo;

    SP_DEVICE_INTERFACE_DATADeviceInterfaceData;

    PSP_DEVICE_INTERFACE_DETAIL_DATA DeviceInterfaceDetailData= NULL;

    ULONG Length, RequiredLength = 0;

    BOOL bResult;

 

    HardwareDeviceInfo = SetupDiGetClassDevs(

                             InterfaceGuid,

                             NULL,

                             NULL,

                             (DIGCF_PRESENT |DIGCF_DEVICEINTERFACE));

 

    if (HardwareDeviceInfo ==INVALID_HANDLE_VALUE) {

        printf("SetupDiGetClassDevsfailed!\n");

        exit(1);

    }

 

    DeviceInterfaceData.cbSize =sizeof(SP_DEVICE_INTERFACE_DATA);

 

    bResult =SetupDiEnumDeviceInterfaces(HardwareDeviceInfo,

                                             0,

                                             InterfaceGuid,

                                             0,

                                              &DeviceInterfaceData);

 

    if (bResult == FALSE) {

/*

        LPVOID lpMsgBuf;

 

        if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |

                         FORMAT_MESSAGE_FROM_SYSTEM |

                         FORMAT_MESSAGE_IGNORE_INSERTS,

                          NULL,

                          GetLastError(),

                         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

                          (LPSTR)&lpMsgBuf,

                          0,

                          NULL

                          )) {

 

            printf("Error: %s",(LPSTR)lpMsgBuf);

            LocalFree(lpMsgBuf);

        }

*/

       printf("SetupDiEnumDeviceInterfaces failed.\n");

 

       SetupDiDestroyDeviceInfoList(HardwareDeviceInfo);

        exit(1);

    }

 

    SetupDiGetDeviceInterfaceDetail(

        HardwareDeviceInfo,

        &DeviceInterfaceData,

        NULL,

        0,

        &RequiredLength,

        NULL

        );

 

    DeviceInterfaceDetailData =(PSP_DEVICE_INTERFACE_DETAIL_DATA) LocalAlloc(LMEM_FIXED, RequiredLength);

 

    if (DeviceInterfaceDetailData == NULL) {

       SetupDiDestroyDeviceInfoList(HardwareDeviceInfo);

        printf("Failed to allocatememory.\n");

        exit(1);

    }

 

    DeviceInterfaceDetailData->cbSize =sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);

 

    Length = RequiredLength;

 

    bResult = SetupDiGetDeviceInterfaceDetail(

                  HardwareDeviceInfo,

                  &DeviceInterfaceData,

                  DeviceInterfaceDetailData,

                  Length,

                  &RequiredLength,

                  NULL);

 

    if (bResult == FALSE) {

/*

        LPVOID lpMsgBuf;

 

        if(FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |

                     FORMAT_MESSAGE_FROM_SYSTEM |

                      FORMAT_MESSAGE_IGNORE_INSERTS,

                      NULL,

                      GetLastError(),

                      MAKELANGID(LANG_NEUTRAL,SUBLANG_DEFAULT),

                      (LPSTR) &lpMsgBuf,

                      0,

                      NULL

                      )) {

 

            MessageBox(NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK);

            LocalFree(lpMsgBuf);

        }

*/

        printf("Error inSetupDiGetDeviceInterfaceDetail\n");

 

        SetupDiDestroyDeviceInfoList(HardwareDeviceInfo);

        LocalFree(DeviceInterfaceDetailData);

        exit(1);

    }

 

    returnDeviceInterfaceDetailData->DevicePath;

 

}

 

1.3 打开设备

CreateFile这里的路径需要填写设备路径，可以通过上面的函数查到，也可以自己直接指定。

1.4 DeviceIoControl控制设备

       // Call device IO Control interface(CharSample_IOCTL_800) in driver

       if (!DeviceIoControl(hDevice,

                                                      CharSample_IOCTL_800,

                                                      bufInput,

                                                      1,

                                                      bufOutput,

                                                      2,

                                                      &nOutput,

                                                      NULL)

         )

       {

                printf("ERROR:DeviceIoControl returns %0x.", GetLastError());

        goto exit;

       }

 

 

说明下:  这里的CharSample_IOCTL_800就是在设备事件队列中定义的驱动IO控制功能

 

1.5 CloseHandle(hDevice)

       最后关闭设备就可以了