vc实现的串口程序开发相关动态链接库，可以发送接受，简单实用.rar

// port_dll.cpp : Defines the initialization routines for the DLL. // #include "stdafx.h" #include "port_dll.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif // // Note! // // If this DLL is dynamically linked against the MFC // DLLs, any functions exported from this DLL which // call into MFC must have the AFX_MANAGE_STATE macro // added at the very beginning of the function. // // For example: // // extern "C" BOOL PASCAL EXPORT ExportedFunction() // { // AFX_MANAGE_STATE(AfxGetStaticModuleState()); // // normal function body here // } // // It is very important that this macro appear in each // function, prior to any calls into MFC. This means that // it must appear as the first statement within the // function, even before any object variable declarations // as their constructors may generate calls into the MFC // DLL. // // Please see MFC Technical Notes 33 and 58 for additional // details. // ///////////////////////////////////////////////////////////////////////////// // CPort_dllApp BEGIN_MESSAGE_MAP(CPort_dllApp, CWinApp) //{{AFX_MSG_MAP(CPort_dllApp) // NOTE - the ClassWizard will add and remove mapping macros here. // DO NOT EDIT what you see in these blocks of generated code! //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CPort_dllApp construction CPort_dllApp::CPort_dllApp() { // TODO: add construction code here, // Place all significant initialization in InitInstance } ///////////////////////////////////////////////////////////////////////////// // The one and only CPort_dllApp object CPort_dllApp theApp; CWinThread* m_pThread; // 代表辅助线程 volatile BOOL m_bConnected;//表示连接否，用来标识菜单串口连接和断开连接是否可用 volatile HWND m_hTermWnd;//辅助窗口 volatile HANDLE m_hPostMsgEvent; // 用于WM_COMMNOTIFY消息的事件对象 OVERLAPPED m_osRead, m_osWrite; // 用于重叠读/写 // 串行口句柄 int m_nBaud;//数据传输速率 int m_nDataBits;//数据位 BOOL m_bEcho;//表明本地回显 BOOL m_bNewLine;//表明自动换行 int m_nParity;//校验位 CString m_sPort;//串行端口 int m_nStopBits;//停止位 HANDLE fp; //打印机句并 FILE *hp; HANDLE _stdcall OpenConnection(int ipt) { HANDLE m_hCom; COMMTIMEOUTS TimeOuts; DCB dcb; m_nBaud = 9600; m_nDataBits = 8; m_bEcho = FALSE; m_bNewLine = FALSE; m_nParity = 0; m_sPort = "COM1"; m_nStopBits = 0; char s[5]=""; sprintf(s,"COM%d",ipt); m_hCom=CreateFile(s, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL , NULL); // 重叠方式 if(m_hCom==INVALID_HANDLE_VALUE) return 0; SetupComm(m_hCom,4096,4096); // 把间隔超时设为最大，把总超时设为0将导致ReadFile立即返回并完成操作 TimeOuts.ReadIntervalTimeout=MAXDWORD; TimeOuts.ReadTotalTimeoutMultiplier=0; TimeOuts.ReadTotalTimeoutConstant=0; /* 设置写超时以指定WriteComm成员函数中的GetOverlappedResult函数的等待时间*/ TimeOuts.WriteTotalTimeoutMultiplier=50; TimeOuts.WriteTotalTimeoutConstant=2000; SetCommTimeouts(m_hCom, &TimeOuts); if(!GetCommState(m_hCom, &dcb)) return 0; dcb.fBinary=TRUE; dcb.BaudRate = m_nBaud; // 数据传输速率 dcb.StopBits = ONESTOPBIT;//1停止位 dcb.ByteSize = m_nDataBits; // 每字节位数 dcb.Parity = NOPARITY; //////////无奇偶校验 if(!SetCommState(m_hCom, &dcb)) { AfxMessageBox("Can not Set DCB"); return 0; } SetCommMask(m_hCom, EV_RXCHAR); return m_hCom; } /************************************************ ************************************************/ DWORD _stdcall ReadComm(HANDLE m_hCom,char* buf, DWORD dwLength) { DWORD length=0; COMSTAT ComStat; DWORD dwErrorFlags; // int i; ClearCommError(m_hCom,&dwErrorFlags,&ComStat); //comstate.cbInQue 指明串口中已经接受到的字节数，不是readfile操作要求读出的字节数 length=min(dwLength, ComStat.cbInQue); // length=dwLength; //length 从串口读取的字节数 //&length指向调用该函数读出的字节数。 ReadFile(m_hCom,buf,length,&length,&m_osRead); PurgeComm(m_hCom,PURGE_TXCLEAR);//清除发送缓冲区 PurgeComm(m_hCom,PURGE_RXCLEAR);//清除接受缓冲区 /* FILE *fp; fp=fopen("cc.txt","w+b"); //写，二进制 if (fp!=NULL) fwrite(&dwLength,2,1,fp); fwrite(buf,dwLength,1,fp); fclose(fp); fwrite(buffer,size,count,fp) buffer 写入数据的存放地址 size 写入数据的字节数 count 写入多少个size字节数据项 fp 文件指针 */ return length; //返回读出的字节数。 } /************************************************ ************************************************/ DWORD _stdcall WriteComm(HANDLE m_hCom,char* buf, DWORD dwLength) { BOOL fState; DWORD length=dwLength; COMSTAT ComStat; DWORD dwErrorFlags; ClearCommError(m_hCom,&dwErrorFlags,&ComStat); PurgeComm(m_hCom,PURGE_TXCLEAR);//清除发送缓冲区 PurgeComm(m_hCom,PURGE_RXCLEAR);//清除接受缓冲区 fState=WriteFile(m_hCom,buf,length,&length,&m_osWrite); if(!fState) { if(GetLastError()==ERROR_IO_PENDING) { GetOverlappedResult(m_hCom,&m_osWrite,&length,TRUE);// 等待 } else length=0; } return length; } void _stdcall CloseConnection(HANDLE m_hCom) { CloseHandle(m_hCom); } /************************************************ 并口打印机打印函数 ************************************************/ int __stdcall ClosePalPort(void) { CloseHandle(fp); return 1; } int __stdcall PalPortInit(int iPt) { DWORD dwBytesWritten =0; OVERLAPPED overlappedwrite; overlappedwrite.Internal=0; overlappedwrite.InternalHigh=0; overlappedwrite.Offset=0; overlappedwrite.OffsetHigh=0; overlappedwrite.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL); if(iPt==1) { fp=CreateFile( "LPT1",GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, 0); } if(iPt==2) { fp=CreateFile( "LPT2",GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, 0); } if(fp==INVALID_HANDLE_VALUE) { AfxMessageBox("can not open LPT "); CloseHandle(fp); return 0; } return 1; } //************************************************ //函数: POS58_PrnCnEn //功能: 向POS58打印机发送字符串并打印 //参数: iPt:打印机端口,1:LPT1,2:LPT2 // str:要发送的字符串 //返回: 1:成功;0:错误; //说明: 此函数可以打印中英文混合字符串 //************************************************** int __stdcall POS58_PrnCnEn(int iPt,char* str) { Sleep(5); DWORD dwBytesWritten =0; OVERLAPPED overlappedwrite; overlappedwrite.Internal=0; overlappedwrite.InternalHigh=0; overlappedwrite.Offset=0; overlappedwrite.OffsetHigh=0; overlappedwrite.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL); WriteFile( fp,str,strlen(str),&dwBytesWritten, &overlappedwrite); { DWORD error; error=GetLastError(); /* if (error!=ERROR_IO_PENDING)//写不成功 { AfxMessageBox("Printer fail "); return 0; } */ } return 1; } /* //直接打印字符串 void __stdcall PrnStr(LPSTR str) { // PalPortInit(1); // POS58_PrnCnEn(1,str); // POS58_PrnCnEn(1,ss); // ClosePalPort(); char ss[2]="\x0a"; char s1[100]=""; for(unsigned int i=0;i<strlen(str);i++) s1[i]=str[i]; FILE *fp; fp=fopen("LPT1","w"); if(fp!=NULL) { fwrite(&s1,strlen(s1),1,fp); fwrite(&ss,strlen(ss),1,fp); } fclose(fp); } //直接发送命令 void __stdcall PrnComm(LPSTR str) { // PalPortInit(1); // POS58_PrnCnEn(1,str); // ClosePalPort(); char s1[100]=""; for(unsigned int i=0;i<strlen(str);i++) s1[i]=str[i]; FILE *fp; fp=fopen("LPT1","w"); if(fp!=NULL) { fwrite(&s1,strlen(s1),1,fp);