Wrote win32 thread to read serial data (character at a time) from COM2 port, once it come across "\r\n', send that data to another thread to process it, it is not working, readfile gives an error, any idea?
I am using COM2 port, running 4800 speed, 8 bits, No parity, I opened COM2 directly, do I need to input speed, parity and stopbits? -
#include <windows.h>
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#include <stdio.h>
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#include <tchar.h>
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#include <strsafe.h>
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#define BUFSIZE 512
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DWORD WINAPI InstanceThread();
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VOID GetAnswerToRequest(LPTSTR);
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HANDLE handle;
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int main(VOID)
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{
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BOOL fConnected = FALSE;
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DWORD dwThreadId = 0;
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HANDLE hPipe = INVALID_HANDLE_VALUE, hThread = NULL;
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handle= CreateFile( "COM2", GENERIC_READ | GENERIC_WRITE,1,NULL,
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OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL );
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for (;;)
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{
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printf("creating a processing thread.\n");
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// Create a thread.
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hThread = CreateThread(
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NULL, // no security attribute
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0, // default stack size
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InstanceThread, // thread proc
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NULL, // thread parameter
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0, // not suspended
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&dwThreadId); // returns thread ID
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if (hThread == NULL)
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{
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_tprintf(TEXT("CreateThread failed, GLE=%d.\n"), GetLastError());
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return -1;
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}
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else CloseHandle(hThread);
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}
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return 0;
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}
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DWORD WINAPI InstanceThread()
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{
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char buf[1024] = {0};
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char ch = 0;
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DWORD len = 0;
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BOOL err = FALSE;
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int slen = 0;
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char *ptr = NULL;
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static char send[1024] = {0};
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BOOL fNoValid = FALSE;
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while(1)
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{
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len = 0;
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err = ReadFile(handle, &ch, 1, &len, NULL);
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if((err == 0)||(len == 0))
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{
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Sleep(10);
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continue;
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}
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buf[slen] = ch;
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switch(ch)
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{
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case '\r' :
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break;
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case '\n' :
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if(fNoValid == FALSE)
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{
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buf[slen] = '\0';
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memcpy(send, buf, slen+1);
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GetAnswerToRequest(send);
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}
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else
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{
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buf[0] = '\n';
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buf[1] = '\0';
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memcpy(send, buf, 2);
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GetAnswerToRequest(send);
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}
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slen = 0;
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fNoValid = FALSE;
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break;
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default :
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if((ch >= 0x20) && (ch < 0x7E))
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{
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slen++;
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if(slen > (ARRAYSIZE(buf)-1))
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{
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slen = 0;
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}
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}
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else
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{
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fNoValid = TRUE;
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}
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break;
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}
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}
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return(0);
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}
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VOID GetAnswerToRequest( LPTSTR pchRequest)
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{
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//Process the string, print the string temporarily
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printf( TEXT("String received on COM2 port:\"%s\"\n"), pchRequest );
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}
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1  3100 
What part is not working??
the reading part or thread part?
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