编写在USB接口读写数据的C++程序

1、文档编码 : CM5N7B4Q2S5 HN3E10T10S8L5 ZQ1O4V5X1G10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; memsetm_sysversion, 0, 20; GetSysVersionm_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 = :SetupDiGetClassDevsLPGUID&guidHID_1,/GUID_CLASS_USB_DEVICE, / class GUI D NULL, / 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

3、nCount = 0; bResult = TRUE; for i=0; icbSize = sizeofSP_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, / 不需运算输出缓冲区大小 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、trcpypszDevicePathnCount, pDetail-DevicePath; if strcmpm_sysversion, winnt=0 char ch18; fori=0;iDevicePath+8+i; ch17=0; if strcmpch,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 security TRUE

5、, / explicit reset req FALSE, / initial event reset NULL ; / no name if READ_OS.hEvent = NULL break; WRITE_OS.hEvent = CreateEvent NULL, / no security TRUE, / explicit reset req FALSE, / initial event reset NULL ; / no name if NULL = WRITE_OS.hEvent CloseHandle READ_OS.hEvent ; break; hUsb=CreateFil

6、epDetail-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 PORT上char id30; memsetid, 0, 30; i=0; do idi=*pDetail-DevicePath+26+i; i+; whileidi-1.=#; id

7、i-1 = 0; for j=0; jDevicePath; m_USBPositionMapnCount = j+1; break; CloseHandlehUsb; nCount+; / break; / 比较驱动版本 / 比较操作系统版本 else memset &READ_OS, 0, sizeof OVERLAPPED ; memset &WRITE_OS, 0, sizeof OVERLAPPED ; READ_OS.hEvent = CreateEvent NULL, / no security TRUE, / explicit reset req FALSE, / initia

8、l event reset NULL ; / no name if READ_OS.hEvent = NULL break; WRITE_OS.hEvent = CreateEvent NULL, / no security TRUE, / explicit reset req FALSE, / initial event reset NULL ; / no name if NULL = WRITE_OS.hEvent CloseHandle READ_OS.hEvent ; break; hUsb=CreateFilepDetail-DevicePath,/&guidHID_1,/ GENE

9、RIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL/*| FILE_FLAG_OVERLAPPED*/, NULL; if hUsb .= NULL ifstrcmppDetail-DevicePath, m_USBListj=0 sprintfm_DeviceDescj+1, %s, pDetail-DevicePath; m_USBPositionMapnCount = j+1; break; CloseHandlehUsb; nCount+

10、; / break; / 释放设备接口数据空间:GlobalFreepDetail; / 关闭设备信息集句柄:SetupDiDestroyDeviceInfoListhDevInfoSet; iDeviceCount = nCount; return nCount; / 写 BOOL Writestrchar *buf,int buflen, int index BOOL fWriteStat; DWORD dwErrorFlags; DWORD dwError; COMSTAT ComStat; char szError 10 ; DWORD ret; int len, i, j, pack

11、et; div_t div_result; BYTE sendpacket65; BYTE xorcode=0 x00; if m_gphdComindex = NULL / no usb devicejk100c return -1; div_result = divbuflen, 58; if div_result.rem = 0 packet = div_result.quot; else packet = div_result.quot+1; for i=0; ipacket; i+ memsetsendpacket, 0, 65; ifi=packet-1 / end packet

12、if div_result.rem = 0 len = 58; else len = div_result.rem; else len = 58; sendpacket0 = 0 x13; sendpacket1 = 3+len; sendpacket2 = 0 x01; sendpacket3 = packet*16+i+1; memcpysendpacket+4, buf+i*58, len; forj=0;jlen+3;j+ xorcode=sendpacketj+1; sendpacketlen+4 = charxorcode; sendpacketlen+5 = 0 x23; Pur

13、geCommm_gphdComindex,PURGE_RXCLEAR|PURGE_TXCLEAR; / Sleep10; fWriteStat = WriteFilem_gphdComindex, sendpacket, len+6,&ret, NULL; if .fWriteStat ifGetLastError = ERROR_IO_PENDING dwError = GetLastError; / an error occurred, try to recover wsprintf szError, nr , dwError ; OutputDebugStringszError; Cle

14、arCommErrorm_gphdComindex, &dwErrorFlags, &ComStat ; if dwErrorFlags 0 wsprintf szError, nr , dwErrorFlags ; OutputDebugStringszError; else / some other error occurred ClearCommErrorm_gphdComindex, &dwErrorFlags, &ComStat ; if dwErrorFlags 0 wsprintf szError, nr , dwErrorFlags ; OutputDebugStringszE

15、rror; return FALSE; if i .= packet-1 / should be receive ack if ReceivePacketAnswerindex .= 0 return FALSE; return TRUE; / 读 int Readstrchar *buf,int nMaxLength, int index BOOL fReadStat ; COMSTAT ComStat; DWORD dwErrorFlags; DWORD dwLength; DWORD dwError; char szError 10 ; if fCOMMOpened=0 return F

16、ALSE; / 串口未打开 / only try to read number of bytes in queue ClearCommErrorm_gphdComindex, &dwErrorFlags, &ComStat ; /dwLength = min DWORD nMaxLength, ComStat.cbInQue ; dwLength=nMaxLength; if dwLength 0 if olap=TRUE fReadStat = ReadFilem_gphdComindex,buf, dwLength, &dwLength,&READ_OS ; if .fReadStat i

17、f GetLastError = ERROR_IO_PENDING OutputDebugStringnrIO Pending; while.GetOverlappedResultm_gphdComindex, &READ_OS, &dwLength, TRUE dwError = GetLastError; ifdwError = ERROR_IO_INCOMPLETE continue; else / an error occurred, try to recover ClearCommErrorm_gphdComindex,&dwErrorFlags, &ComStat ; break;

18、 else / end-if GetLastError = ERROR_IO_PENDING / some other error occurred dwLength = 0 ; ClearCommErrorm_gphdComindex, &dwErrorFlags, &ComStat ; if dwErrorFlags 0 wsprintf szError, nr , dwErrorFlags ; OutputDebugStringszError; / end-if .fReadStat / end-if olap=TRUE else fReadStat = ReadFile m_gphdCo