控制台下WinApi同步方式实现的串口发送数据

// ApiOpenCom1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "windows.h"
//using std namespace ;

int main(int argc, char* argv[])
{

int rc =0;
HANDLE hComm=INVALID_HANDLE_VALUE;
COMMTIMEOUTS commtimeouts;
//	const unsigned short * filename="COM1";

hComm = CreateFile("COM1", GENERIC_WRITE|GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);//倒数第2个参数控制 是否使用重叠IO，这里不使用。
//	hComm = CreateFile("COM1",						// communication port string (COMX)
//					     GENERIC_READ | GENERIC_WRITE,	// read/write types
//					     0,								// comm devices must be opened with exclusive access
//					     NULL,							// no security attributes
//					     OPEN_EXISTING,					// comm devices must use OPEN_EXISTING
//					     FILE_FLAG_OVERLAPPED,			// Async I/O 这个是重叠IO，就是异步方式
//					     NULL);

if (hComm == INVALID_HANDLE_VALUE){
rc = GetLastError();
//		ELOG2("InitUart::CreateFile('%S') FAILED with err = %d \n\r", filename,rc);
printf("Open Com1 Failed with %d\n",rc);
return false;
}else{
printf("Open success\n");//
//		system("PAUSE");
};

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DCB  PortDCB;
PortDCB.DCBlength = sizeof(DCB);
// ĬÈÏ´®¿Ú²ÎÊý
GetCommState(hComm, &PortDCB);
PortDCB.BaudRate = 9600; // baud
PortDCB.ByteSize = 8;     // Number of bits/byte, 4-8
PortDCB.Parity = NOPARITY;
PortDCB.StopBits = ONESTOPBIT;
if(! SetCommState(hComm, &PortDCB))
{
printf("CUartReader::Init -- SetCommState FAILED\n\r");
return false;
}

char * pHelloworld="HelloWorld\r\n";
unsigned char Helloworld[32];
memcpy(Helloworld,pHelloworld,strlen(pHelloworld));

unsigned long BytesSent;
int result;

//	OpenFile(hComm);

//	result=WriteFile(		hComm,							// Handle to COMM Port
//							Helloworld,					// Pointer to message buffer in calling finction
//							5,	// Length of message to send
//							&BytesSent,			// Where to store the number of bytes sent
//							NULL
//							);				// Overlapped structure)

DWORD len;
char  data[1024];
memset(data,0,sizeof(data));
strcpy(data,"data to send ");
result=WriteFile(hComm ,data,strlen(data),&len,0);

if(result){
printf("Send Over\n");
}else{
rc = GetLastError();
printf("Send Failed with %d\n",rc);
}
}