MFC下串口通信程序, 接收不到数据

最好用线程来接受程序

static UINTRevThreadProc2(LPVOID pParam)

{

HANDLEh_gEvent

DWORDdwBytesRead

OVERLAPPEDOverlapped

BOOL bReadStatus = FALSE

dwBytesRead = 0

//MessageBox("abc")

memset(&Overlapped,0,sizeof(OVERLAPPED))

h_gEvent = NULL

h_gEvent = CreateEvent(

NULL,

TRUE,//手工设置事件有无信号

FALSE,//初始化事件为无信号状态

NULL//无名事件对像

)

if(h_gEvent == NULL) return 0

Overlapped.hEvent = h_gEvent//指定一个I/O *** 作完成后触发的事件

BYTE data[COM_BUFSIZE]

ZeroMemory(data,COM_BUFSIZE)

DWORD dwEvtMask=0

GetCommMask(g_pMainDlg->m_Io0.m_hHandle,&dwEvtMask)

dwEvtMask |=EV_RXCHAR

SetCommMask(g_pMainDlg->m_Io0.m_hHandle,dwEvtMask)

while(g_pMainDlg->m_Io0.m_hHandle)

{

WaitCommEvent(g_pMainDlg->m_Io0.m_hHandle,&dwEvtMask,NULL)

if (g_pMainDlg->m_Io0.m_hHandle == INVALID_HANDLE_VALUE)

{

return 0

}

if ((dwEvtMask&EV_RXCHAR) == EV_RXCHAR)

{

COMSTAT ComStat

DWORD dwLength,dwErrorFlags

ClearCommError(g_pMainDlg->m_Io0.m_hHandle, &dwErrorFlags, &ComStat )

dwLength = ComStat.cbInQue //输入缓冲区接收了多少数据？

if (dwLength >0)

{

//AfxMessageBox("RevThreadProc2")

bReadStatus = ReadFile( g_pMainDlg->m_Io0.m_hHandle, data,dwLength, &dwBytesRead, &Overlapped)

if(!bReadStatus)

{

if(GetLastError()==ERROR_IO_PENDING)

{

while(!GetOverlappedResult(g_pMainDlg->m_Io0.m_hHandle,

&Overlapped, &dwBytesRead, TRUE ))

{

if(GetLastError() == ERROR_IO_INCOMPLETE)

continue

}

for(DWORD i = 0i<dwBytesReadi++)

{

g_pMainDlg->m_RevData[rec_pos_lineless] = data[i]

rec_pos_lineless++

}

if (rec_pos_lineless >= 5)

{

SetStudentUpDownFromCom(g_pMainDlg->m_RevData,rec_pos_lineless)

rec_pos_lineless = 0

}

}

}

else

{

for(DWORD i = 0i<dwBytesReadi++)

{

g_pMainDlg->m_RevData[rec_pos_lineless] = data[i]

if (data[i] == 144 || data[i] == 80 ||data[i] == 255)

{

bvn++

}

rec_pos_lineless++

}

if (bvn >= 3)

{

、、、、、、、、处理接受到的数据

bvn =0

rec_pos_lineless = 0

}

}

}

}

}

ExitThread(0)

CloseHandle(h_gEvent)//读取时的OS

return 0

}

这个是我写的一个线程，可以接受的，希望对你有用

对话框中右键-》Insert ActiveX Control-》Microsoft Communications Control

这就是著名的串口控件MSCOMM32

然后控件绑定一个变量，发送数据就是m_Comm->SetOutput(内容)

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