编写在USB接口读写数据的C++程序

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1、使用一个 GUIDguidHID_1查找并打开一个 USB设备extern C int PASCAL SearchUSBDevice() HANDLE hUsb;int nCount, i, j;/ 标记同一设备个数 HDEVINFO hDevInfoSet;BOOL bResult;PSP_DEVICE_INTERFACE_DETAIL_DATA pDetail =NULL;memset(m_sysversion, 0, 20);GetSysVersion(m_sysversion);/检索相关GUID的USB设备总设备个数if (!GetUSBList()return 0;/取得一个该GU

2、ID相关的设备信息集句柄hDevInfoSet = :SetupDiGetClassDevs(LPGUID)&guidHID_1,/GUID_CLASS_USB_DEVICE, / class GUIDNULL, / 无关键字NULL, / 不指定父窗口句柄DIGCF_PRESENT | DIGCF_DEVICEINTERFACE); / 目前存在的设备/ 失败 .if (hDevInfoSet = INVALID_HANDLE_VALUE)return NULL;/ 申请设备接口数据空间nCount = 0;bResult = TRUE;for (i=0; icbSize = sizeof(

3、SP_DEVICE_INTERFACE_DETAIL_DATA);bResult = SetupDiGetInterfaceDeviceDetail( hDevInfoSet, / 设备信息集句柄 &ifdata, /设备接口信息pDetail, /设备接口细节( 设备路径 )predictedLength, /输出缓冲区大小&requiredLength, /不需计算输出缓冲区大小(直接用设定值 )NULL); / 不需额外的设备描述/ 复制设备路径到输出缓冲区/:strcpy(pszDevicePathnCount, pDetail-DevicePath);if (strcmp(m_sys

4、version, winnt)=0)char ch18;for(i=0;iDevicePath+8+i);ch17=0;if (strcmp(ch,vid_0471&pid_0666)=0)/ 比较版本号，防止意外出错memset( &READ_OS, 0, sizeof( OVERLAPPED ) ) ;memset( &WRITE_OS, 0, sizeof( OVERLAPPED ) ) ;READ_OS.hEvent = CreateEvent( NULL, / no securityTRUE, / explicit reset reqFALSE, / initial event re

5、setNULL ) ; / no nameif (READ_OS.hEvent = NULL)break;WRITE_OS.hEvent = CreateEvent( NULL, / no securityTRUE, / explicit reset reqFALSE, / initial event resetNULL ) ; / no nameif (NULL = WRITE_OS.hEvent)CloseHandle( READ_OS.hEvent );break;hUsb=CreateFile(pDetail-DevicePath,/&guidHID_1,/GENERIC_READ|G

6、ENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL/*|FILE_FLAG_OVERLAPPED*/,NULL);/ 比较定位找到的 USB在哪个USB PORThchar id30;memset(id, 0, 30);i=0;doidi=*(pDetail-DevicePath+26+i);i+;while(idi-1!=#);idi-1 = 0;for (j=0; jDevicePath);m_USBPositionMapnCount = j+1;break;Close

7、Handle(hUsb);nCount+;/ break;/ 比较驱动版本/ 比较操作系统版本elsememset( &READ_OS, 0, sizeof( OVERLAPPED ) ) ;memset( &WRITE_OS, 0, sizeof( OVERLAPPED ) ) ;READ_OS.hEvent = CreateEvent( NULL, / no securityTRUE, / explicit reset reqFALSE, / initial event resetNULL ) ; / no nameif (READ_OS.hEvent = NULL)break;WRITE

8、_OS.hEvent = CreateEvent( NULL, / no security TRUE, / explicit reset reqFALSE, / initial event resetNULL ) ; / no nameif (NULL = WRITE_OS.hEvent)CloseHandle( READ_OS.hEvent );break;hUsb=CreateFile(pDetail-DevicePath,/&guidHID_1,/ GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_

9、EXISTING,FILE_ATTRIBUTE_NORMAL/*|FILE_FLAG_OVERLAPPED*/,NULL);if (hUsb != NULL)if(strcmp(pDetail-DevicePath, m_USBListj)=0)sprintf(m_DeviceDescj+1, %s, pDetail-DevicePath);m_USBPositionMapnCount = j+1;break;CloseHandle(hUsb);nCount+;/ break;/ 释放设备接口数据空间:GlobalFree(pDetail);/ 关闭设备信息集句柄:SetupDiDestroy

10、DeviceInfoList(hDevInfoSet);iDeviceCount = nCount;return nCount;/ 写BOOL Writestr(char *buf,int buflen, int index)BOOL fWriteStat;DWORD dwErrorFlags;DWORD dwError;COMSTAT ComStat;char szError 10 ;DWORD ret;int len, i, j, packet;div_t div_result;BYTE sendpacket65;BYTE xorcode=0x00;if (m_gphdComindex =

11、 NULL) / no usb device(jk100c) return -1;div_result = div(buflen, 58);if (div_result.rem = 0)packet = div_result.quot;elsepacket = div_result.quot+1;for (i=0; ipacket; i+)memset(sendpacket, 0, 65);if(i=packet-1)/ end packetif (div_result.rem = 0)len = 58;elselen = div_result.rem;else len = 58;sendpa

12、cket0 = 0x13;sendpacket1 = 3+len;sendpacket2 = 0x01;sendpacket3 = packet*16+i+1;memcpy(sendpacket+4, buf+(i*58), len);for(j=0;jlen+3;j+)xorcodeA=sendpacketj+1;sendpacketlen+4 = (char)xorcode;sendpacketlen+5 = 0x23;PurgeComm(m_gphdComindex,PURGE_RXCLEAR|PURGE_TXCLEAR); / Sleep(10);fWriteStat = WriteF

13、ile(m_gphdComindex, sendpacket, len+6,&ret, NULL);if (!fWriteStat)if(GetLastError() = ERROR_IO_PENDING)dwError = GetLastError();/ an error occurred, try to recoverwsprintf( szError, nr , dwError ) ;OutputDebugString(szError);ClearCommError(m_gphdComindex, &dwErrorFlags, &ComStat ) ;if (dwErrorFlags

14、0)wsprintf( szError, nr , dwErrorFlags ) ;OutputDebugString(szError); else/ some other error occurredClearCommError(m_gphdComindex, &dwErrorFlags, &ComStat ) ;if (dwErrorFlags 0)wsprintf( szError, nr , dwErrorFlags ) ;OutputDebugString(szError);return FALSE;if (i != packet-1)/ should be receive acki

15、f (ReceivePacketAnswer(index) != 0)return FALSE;return TRUE;/ 读int Readstr(char *buf,int nMaxLength, int index)BOOL fReadStat ;COMSTAT ComStat;DWORD dwErrorFlags;DWORD dwLength;DWORD dwError;char szError 10 ;if (fCOMMOpened=0)return FALSE; / 串口未打开/ only try to read number of bytes in queueClearCommE

16、rror(m_gphdComindex, &dwErrorFlags, &ComStat) ;/dwLength = min( (DWORD) nMaxLength, ComStat.cbInQue ) ;dwLength=nMaxLength;if (dwLength 0)if (olap=TRUE)fReadStat = ReadFile(m_gphdComindex,buf, dwLength, &dwLength,&READ_OS) ; if (!fReadStat)if (GetLastError() = ERROR_IO_PENDING)OutputDebugString(nrIO

17、 Pending);while(!GetOverlappedResult(m_gphdComindex, &READ_OS,&dwLength, TRUE )dwError = GetLastError();if(dwError = ERROR_IO_INCOMPLETE) continue; else/ an error occurred, try to recoverClearCommError(m_gphdComindex,&dwErrorFlags, &ComStat ) ; break;else / endif (GetLastError() = ERROR_IO_PENDING)/

18、 some other error occurreddwLength = 0 ;ClearCommError(m_gphdComindex, &dwErrorFlags, &ComStat ) ;if (dwErrorFlags 0)wsprintf( szError, nr , dwErrorFlags ) ;OutputDebugString(szError); / endif (!fReadStat) / endif (olap=TRUE)elsefReadStat = ReadFile( m_gphdComindex,buf, dwLength, &dwLength, NULL ) ; if (!fReadStat)dwError = GetLastError();ClearCommError(m_gphdComindex,&dwErrorFlags, &ComStat ) ;if (dwErrorFlags 0)wsprintf( szError, nr , dwErrorFlags ) ;OutputDebugString(szError);PurgeComm(m_gphdComindex,PURGE_RXCLEAR|PURGE_TXCLEAR);return dwLength;