vc中访问HID设备

#include <usbscan.h>

#include <setupapi.h>

extern "C"

{

#include <hidsdi.h>

}

#pragma comment(lib, "setupapi.lib")

#pragma comment(lib, "hid.lib")

打开设备
四个模块中，打开设备是最复杂的。因为它需要通过其设备类来枚举设备树上的所有设备，从而得到相匹配的设备，进而得到设备名

BOOL DeviceOpen(HANDLE &handle, WORD wVID, WORD wPID)

{

     BOOL bRet = FALSE;

     GUID hidGuid;

     HDEVINFO hardwareDeviceInfo;

     SP_INTERFACE_DEVICE_DATA deviceInfoData;

     PSP_INTERFACE_DEVICE_DETAIL_DATA functionClassDeviceData = NULL;

     ULONG predictedLength = 0;

     ULONG requiredLength = 0;

     CloseHandle(handle);

     handle = INVALID_HANDLE_VALUE;

     deviceInfoData.cbSize = sizeof(SP_INTERFACE_DEVICE_DATA);

     HidD_GetHidGuid(&hidGuid);

     hardwareDeviceInfo = SetupDiGetClassDevs(&hidGuid, NULL, NULL, (DIGCF_PRESENT|DIGCF_DEVICEINTERFACE));

     for (int i=0; i<128; i++)

     {

         if (!SetupDiEnumDeviceInterfaces(hardwareDeviceInfo, 0, &hidGuid, i, &deviceInfoData)) continue;

         SetupDiGetDeviceInterfaceDetail(hardwareDeviceInfo, &deviceInfoData, NULL, 0, &requiredLength, NULL);

         predictedLength = requiredLength;

         functionClassDeviceData = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc(predictedLength);

         if (!functionClassDeviceData) continue;

         functionClassDeviceData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);

         if (!SetupDiGetDeviceInterfaceDetail (hardwareDeviceInfo, &deviceInfoData, functionClassDeviceData, predictedLength, &requiredLength, NULL))break;

         handle = CreateFile(functionClassDeviceData->DevicePath, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);

         if (handle != INVALID_HANDLE_VALUE)

         {

             HIDD_ATTRIBUTES attri;

             HidD_GetAttributes(handle, &attri);

             if ((attri.VendorID == wVID) &&

                 (attri.ProductID == wPID))

             {

                 bRet = TRUE;

                 break;

             }

             CloseHandle(handle);

             handle = INVALID_HANDLE_VALUE;

         }

     }

     SetupDiDestroyDeviceInfoList(hardwareDeviceInfo);

     return bRet;

}

关闭设备
关闭设备比较简单，只需要直接使用函数CloseHandle即可

void DeviceClose(HANDLE &handle)

{

     CloseHandle(handle);

     handle = INVALID_HANDLE_VALUE;

}

写数据
假设HID的Report大小为8字节，且第一字节为ID

BOOL DeviceWrite(HANDLE handle, LPCVOID lpBuffer, DWORD dwSize)

{

     BYTE wBuffer[8] = {0};

     DWORD dwRet;

     BOOL bRet;

     wBuffer[0] = 0x01;

     wBuffer[1] = 0x00;

     memcpy(&wBuffer[2], lpBuffer, min(6, dwSize));

     bRet = WriteFile(handle, wBuffer, 8, &dwRet, NULL);

     return bRet;

}

读数据

BOOL DeviceRead(HANDLE handle, LPVOID lpBuffer, DWORD dwSize)

{

     BYTE rBuffer[8] = {0};

     DWORD dwRet;

     BOOL bRet;

     rBuffer[0] = 0x01;

     rBuffer[1] = 0xff;

     bRet = WriteFile(handle, rBuffer, 8, &dwRet, NULL);

     bRet &= ReadFile(handle, rBuffer, 8, &dwRet, NULL);

     memcpy(lpBuffer, &rBuffer[1], min(7, dwSize));

     return bRet;

}