用VC++实现USB接口读写数据的程序

1、用VC+实现USB接口读写数据的程序2009-08-15 11:55用VC+实现USB接口读写数据的程序使用一个 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

2、GUID的USB设备总设备个数if (!GetUSBList()return 0;/取得一个该GUID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nCou

3、nt = 0;bResult = TRUE;for (i=0; icbSize = sizeof(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if (bResult)/ 复制设备路径到输出缓冲区/:s

4、trcpy(pszDevicePathnCount, pDetail-DevicePath);if (strcmp(m_sysversion, 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,

5、/ no securityTRUE, / explicit reset reqFALSE, / initial event resetNULL ) ; / 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 );brea

6、k;hUsb=CreateFile(pDetail-DevicePath,/&guidHID_1,/GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL/*|FILE_FLAG_OVERLAPPED*/,NULL);if (hUsb != NULL)/比较定位找到的USB在哪个USB PORTtchar id30; memset(id, 0, 30);i=0;do id=*(pDetail-DevicePath+26+i);i+; while(id

7、!=#);id = 0;for (j=0; jDevicePath); m_USBPositionMapnCount = j+1;break;CloseHandle(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 security TRUE, / explicit reset reqFALS

8、E, / initial event resetNULL ) ; / 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,/&gui

9、dHID_1,/GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ|FILE_SHARE_WRITE,NULL,OPEN_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(hUs

10、b);nCount+;/ break;/ 释放设备接口数据空间:GlobalFree(pDetail);/ 关闭设备信息集句柄:SetupDiDestroyDeviceInfoList(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,

11、packet; div_t div_result;BYTE sendpacket65;BYTE xorcode=0x00;if (m_gphdComindex = NULL) / no usb device(jk100c) return -1;div_result = div(buflen, 58);if (div_result.rem = 0) packet = div_result.quot; else packet = div_result.quot+1;for (i=0; ipacket; i+) memset(sendpacket, 0, 65);if(i=packet-1)/ en

12、d packetif (div_result.rem = 0) len = 58; elselen = div_result.rem;else len = 58;sendpacket0 = 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=se ndpacketj+1;sendpacketlen+4 = (char)xorcode;sendpacketlen+5 = 0x2

13、3;PurgeComm(m_gphdComindex,PURGE_RXCLEAR|PURGE_TXCLEAR); / Sleep(10);fWriteStat = WriteFile(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 ) ; OutputDebugSt

14、ring(szError);ClearCommError(m_gphdComindex, &dwErrorFlags, &ComStat ) ;if (dwErrorFlags 0)wsprintf( szError, nr , dwErrorFlags ) ;OutputDebugString(szError);else/ some other error occurredClearCommError(m_gphdComindex, &dwErrorFlags, &ComStat ) ;if (dwErrorFlags 0)wsprintf( szError, nr , dwErrorFla

15、gs ) ;OutputDebugString(szError);return FALSE;if (i != packet-1)/ should be receive ackif (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 (

16、fCOMMOpened=0)return FALSE; / 串口未打开/ only try to read number of bytes in queue ClearCommError(m_gphdComindex, &dwErrorFlags, &ComStat) ;/dwLength = min( (DWORD) nMaxLength, ComStat.cbInQue ) ;dwLength=nMaxLength;if (dwLength 0)if (olap=TRUE)fReadStat = ReadFile(m_gphdComindex,buf, dwLength, &dwLengt

17、h,&READ_OS) ; if (!fReadStat)if (GetLastError() = ERROR_IO_PENDING)OutputDebugString(nrIO 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_gphdCom

18、index,&dwErrorFlags, &ComStat ) ; break;else / endif (GetLastError() = ERROR_IO_PENDING)/ 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