C++PC 与串口程序

#include <vcl.h> HANDLE hcom=INVALID_HANDLE_VALUE; const char *port_name[4]={ "COM1", "COM2", "COM3", "COM4" }; const char *baud_rate[5]={ "12,", "24,", "48,", "96,", "192," }; const char *check_sum[3]={ "n,8,1", "o,8,1", "e,8,1" }; void Reset_Com(BYTE baud,BYTE parity) { COMMTIMEOUTS temptime; DCB testdcb; char para_str[256]; strcpy(para_str,baud_rate[baud]); strcat(para_str,check_sum[parity]); BuildCommDCB(para_str,&testdcb); SetCommState(hcom,&testdcb); temptime.ReadIntervalTimeout=200; temptime.ReadTotalTimeoutMultiplier=500; temptime.ReadTotalTimeoutConstant=500; temptime.WriteTotalTimeoutMultiplier=500; temptime.WriteTotalTimeoutConstant=500; SetCommTimeouts(hcom,&temptime); } BYTE Create_Com(BYTE com,BYTE band,BYTE parity) { if(hcom!=INVALID_HANDLE_VALUE) CloseHandle(hcom); hcom=CreateFile(port_name[com],(GENERIC_READ | GENERIC_WRITE),(FILE_SHARE_READ | FILE_SHARE_WRITE),NULL,OPEN_EXISTING,0,0); if (hcom!=INVALID_HANDLE_VALUE) { Reset_Com(band,parity); return 1; } return 0; } BYTE ReadCom(char *buf,BYTE length) { DWORD readed; if(hcom==INVALID_HANDLE_VALUE)return 0; ReadFile(hcom,buf,length,&readed,0); if(length==readed)return length; else return 0; } BYTE WriteCom(char *buf,BYTE length) { DWORD writed; if(hcom==INVALID_HANDLE_VALUE)return 0; WriteFile(hcom,buf,length,&writed,0); if(length==writed)return length; else return 0; } void Close_Com() { if(hcom!=INVALID_HANDLE_VALUE) CloseHandle(hcom); hcom=INVALID_HANDLE_VALUE; }