USB_HID读写上位机VC++

#pragma once

#ifdef __cplusplus
extern "C" {
#endif

// This file is in the Windows DDK available from Microsoft.
#include "hidsdi.h"
#include <setupapi.h>
#include <dbt.h>
#include <setupapi.h>

int myUsbDeviceOpen(HANDLE *handle,HANDLE *hReader,HANDLE *hWriter,  WORD wVID, WORD wPID);
void myUsbDeviceClose(HANDLE *handle,HANDLE *hreader,HANDLE *writer);
int myUsbDeviceWrite(HANDLE handle, LPCVOID lpBuffer, DWORD dwSize);
int myUsbDeviceRead(HANDLE handle, LPVOID lpBuffer, DWORD dwSize);

#ifdef __cplusplus
    }
#endif

#include "stdafx.h"
#include "myUSB_HID.h"

#ifdef __cplusplus
extern "C" {
#endif

HIDP_CAPS    Capabilities;
PSP_INTERFACE_DEVICE_DETAIL_DATA HidFunctionClassData = NULL;
int myUsbDeviceOpen(HANDLE *handle,HANDLE *hReader,HANDLE *hWriter,  WORD wVID, WORD wPID)
{
    HANDLE hd;
    HANDLE reader;
    HANDLE writer;
    BOOL bRet = FALSE;
    GUID hidGuid;
    HDEVINFO hardwareDeviceInfo;
    SP_INTERFACE_DEVICE_DATA deviceInfoData;
    ULONG predictedLength = 0;
    ULONG requiredLength = 0;
    PHIDP_PREPARSED_DATA    PreparsedData;
    hd = *handle;
    *handle = NULL;
    CloseHandle(hd);
    hd = 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;
        HidFunctionClassData = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc(predictedLength);
        if (!HidFunctionClassData) 
            continue;
        HidFunctionClassData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
        requiredLength = 0;
        if (!SetupDiGetDeviceInterfaceDetail (hardwareDeviceInfo, &deviceInfoData, HidFunctionClassData, predictedLength, &requiredLength, NULL)) 
            continue;
        hd = CreateFile (HidFunctionClassData->DevicePath, 0, FILE_SHARE_READ|FILE_SHARE_WRITE, (LPSECURITY_ATTRIBUTES)NULL,OPEN_EXISTING, 0, NULL);//FILE_SHARE_READ|FILE_SHARE_WRITE
        if (hd != INVALID_HANDLE_VALUE)
        {
            HIDD_ATTRIBUTES attri;
            HidD_GetAttributes(hd, &attri);
            if ((attri.VendorID == wVID) &&
                (attri.ProductID == wPID))
            {
                writer=CreateFile (HidFunctionClassData->DevicePath, GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, (LPSECURITY_ATTRIBUTES)NULL,OPEN_EXISTING, 0, NULL);
                reader=CreateFile(HidFunctionClassData->DevicePath,GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE,(LPSECURITY_ATTRIBUTES)NULL,OPEN_EXISTING,0,NULL);
                HidD_GetPreparsedData(hd,&PreparsedData);    
                HidP_GetCaps(PreparsedData,&Capabilities);
                bRet = TRUE;
                break;
            }
            CloseHandle(hd);
            hd = INVALID_HANDLE_VALUE;
        }
        free(HidFunctionClassData);
    }
    SetupDiDestroyDeviceInfoList(hardwareDeviceInfo);
    *handle= hd;
    *hReader= reader;
    *hWriter = writer;
    return bRet;
}
void myUsbDeviceClose(HANDLE *handle,HANDLE *hreader,HANDLE *writer)
{
    CloseHandle(*hreader);
    *hreader = INVALID_HANDLE_VALUE;
    CloseHandle(*writer);
    *writer = INVALID_HANDLE_VALUE;
    CloseHandle(*handle);
    *handle = INVALID_HANDLE_VALUE;
    if(HidFunctionClassData!=NULL)
    {
        free(HidFunctionClassData);
        HidFunctionClassData = NULL;
    }
}
int myUsbDeviceWrite(HANDLE handle, LPCVOID lpBuffer, DWORD dwSize)
{
    BYTE wBuffer[1024] = {0};
    DWORD dwRet = 0;
    BOOL bRet;
    wBuffer[0] = 0x00;
    wBuffer[1] = (unsigned char)dwSize;
    memcpy(&wBuffer[2], lpBuffer, min(Capabilities.OutputReportByteLength, dwSize));
    bRet = WriteFile(handle, wBuffer, Capabilities.OutputReportByteLength, &dwRet, NULL);
    return bRet;
}

int myUsbDeviceRead(HANDLE handle, LPVOID lpBuffer, DWORD dwSize)
{
    BYTE rBuffer[1024] = {0};
    DWORD dwRet;
    BOOL bRet;
    rBuffer[0] = 0x00;
    bRet = ReadFile(handle, rBuffer, Capabilities.InputReportByteLength, &dwRet, NULL);
    memcpy(lpBuffer, &rBuffer[1], min(rBuffer[0], dwSize));
    return bRet;
}

#ifdef __cplusplus
    }
#endif