自己动手编写串口动态库（超详细）

1、自己动手编写串口动态库（超详细） 自己动手编写串口动态库 手把手教你编写串口调试助手，单片机串口程序 一、串口库源码: 自行在vc6中建立动态库工程 #include #include #include #include #include #include /*导出函数*/ /函数参数：串口名:波特率：9600 用于显示接收数据的文本框的句柄 extern _declspec(dllexport) void entry(char *comname, int baudrate, hwnd rhbox); extern _declspec(dllexport) bool openport(char

2、 *portname); extern _declspec(dllexport) bool setupdcb(int rate_arg); extern _declspec(dllexport) void settimeout(int a, int b, int c, int d, int e); /发送字符或16进制数 extern _declspec(dllexport) void sendchar(unsigned char ch); /显示方式：1：hex 0：char extern _declspec(dllexport) void displayhex(int flag); ext

3、ern _declspec(dllexport) void close(); /只使用上面有注释的三个函数即可 handle hcomm;/串口的句柄 overlapped m_ov;/是一个包含了用于异步输入输出的信息的结构体 comstat comstat;/包含串口结构信息 handle hthread1; /读线程句柄 handle hthread2; /写线程句柄 hwnd hrbox; bool sendflag = false; unsigned char sendchar, receivechar; bool displayhex = false; processerrorme

4、ssage(char* errortext)/打印进程错误信息 /*打开串口*/ bool openport(char *portname) char *temp = new char200; lpvoid lpmsgbuf; formatmessage( format_message_allocate_buffer | format_message_from_system, null, getlasterror(), makelangid(lang_neutral, sublang_default), / default language (lptstr) sprintf(temp, , m

5、essagebox(null, temp, , mb_iconstop); localfree(lpmsgbuf); delete temp; return true; (char*)errortext, lpmsgbuf, ); hcomm = createfile(portname, generic_read | generic_write, 0, 0, open_existing, file_flag_overlapped, 0); return false; return true; if (hcomm = invalid_handle_value) else /*设备控制块的设置*/

6、 /参数 波特率rate_arg： 9600 bool setupdcb(int rate_arg) dcb dcb; int rate = rate_arg; memset( /申请一个dcb结构体空间 if (!getcommstate(hcomm, /* -串口的配置 - */ dcb.baudrate = rate; dcb.parity = noparity; dcb.fparity = 0; dcb.stopbits = onestopbit; dcb.bytesize = 8; dcb.foutxctsflow = 0; dcb.foutxdsrflow = 0; dcb.fdt

7、rcontrol = dtr_control_disable; dcb.fdsrsensitivity = 0; dcb.frtscontrol = rts_control_disable; dcb.foutx = 0; dcb.finx = 0; /* -其他参数的设置 - */ dcb.ferrorchar = 0; dcb.fbinary = 1; dcb.fnull = 0; processerrormessage();/打印错误信息 return false; dcb.fabortonerror = 0; dcb.wreserved = 0; dcb.xonlim = 2; dcb.

8、xofflim = 4; dcb.xonchar = 0x13; dcb.xoffchar = 0x19; dcb.evtchar = 0; /* - */ / 用上面的设备控制块来设置当前串口 if (!setcommstate(hcomm, /设置成功 processerrormessage(); return false; /*超时的设置*/ bool setuptimeout(int readinterval, int readtotalmultiplier, int readtotalconstant, int writetotalmultiplier, int writetotal

9、constant) void receivechar() bool bread = true; bool bresult = true; dword dwerror = 0; dword bytesread = 0; char rxbuff;/接收数据缓冲器 char str10; commtimeouts timeouts; timeouts.readintervaltimeout = readinterval; / 读间隔超时 timeouts.readtotaltimeoutconstant = readtotalconstant;/ 读时间常量 timeouts.readtotalti

10、meoutmultiplier = readtotalmultiplier;/ 读时间系数 timeouts.writetotaltimeoutconstant = writetotalconstant;/ 写时间常量 timeouts.writetotaltimeoutmultiplier = writetotalmultiplier;/ 写时间系数 if (!setcommtimeouts(hcomm, processerrormessage(); return false; /设置当前串口的超时设置 for (;)/死循环等待 sleep(100); bresult = clearcommerror(hcomm, /清除硬件的通讯错误以及if (comstat.cbinque = 0) bresult = readfile(hcomm, / handle to comm port else / printf(打印接收到的数据 sprintf(str, , rxbuff); setwindowtext(hrbox, str); if (bread) 获取通讯设备的当前状态 / pointer to the m_ov structure if (displayhex) / printf(打印接收到的数据 sprintf(st