165 lines
3.7 KiB
C
165 lines
3.7 KiB
C
//
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// Write to the comm one character at a time.
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//
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "windows.h"
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#define BIGWRITE 256000
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unsigned char writebuff[BIGWRITE];
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void main(int argc,char *argv[]) {
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HANDLE hFile;
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DCB MyDcb;
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char *MyPort = "COM1";
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DWORD NumberActuallyWritten;
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DWORD NumberToWrite = 0;
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DWORD UseBaud = 19200;
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if (argc > 1) {
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sscanf(argv[1],"%d",&NumberToWrite);
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if (argc > 2) {
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sscanf(argv[2],"%d",&UseBaud);
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if (argc > 3) {
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MyPort = argv[3];
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}
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}
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}
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printf("Will try to write %d characters.\n",NumberToWrite);
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printf("Will try to write at %d baud.\n",UseBaud);
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printf("Using port: %s\n",MyPort);
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if ((hFile = CreateFile(
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MyPort,
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GENERIC_READ | GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL
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)) != ((HANDLE)-1)) {
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printf("We successfully opened the %s port.\n",MyPort);
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//
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// We've successfully opened the file. Set the state of
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// the comm device. First we get the old values and
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// adjust to our own.
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//
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if (!GetCommState(
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hFile,
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&MyDcb
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)) {
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printf("Couldn't get the comm state: %d\n",GetLastError());
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exit(1);
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}
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MyDcb.BaudRate = UseBaud;
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MyDcb.ByteSize = 8;
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MyDcb.Parity = NOPARITY;
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MyDcb.StopBits = ONESTOPBIT;
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if (SetCommState(
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hFile,
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&MyDcb
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)) {
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unsigned char j;
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DWORD TotalCount;
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printf("We successfully set the state of the %s port.\n",MyPort);
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for (
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TotalCount = 0;
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TotalCount < NumberToWrite;
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) {
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for (
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j = 0;
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j <= 9;
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j++
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) {
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writebuff[TotalCount] = j;
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TotalCount++;
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if (TotalCount >= NumberToWrite) {
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break;
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}
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}
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}
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for (
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TotalCount = 0;
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TotalCount < NumberToWrite;
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) {
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if (WriteFile(
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hFile,
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&writebuff[TotalCount],
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1,
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&NumberActuallyWritten,
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NULL
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)) {
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if (NumberActuallyWritten != 1) {
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printf("Write iteration %d only wrote %d\n",NumberActuallyWritten);
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break;
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} else {
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TotalCount++;
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}
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Status of %d write is: %x\n",TotalCount,LastError);
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}
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}
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't set the %s device.\n",MyPort);
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printf("Status of failed set is: %x\n",LastError);
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}
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CloseHandle(hFile);
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} else {
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DWORD LastError;
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LastError = GetLastError();
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printf("Couldn't open the %s device.\n",MyPort);
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printf("Status of failed open is: %x\n",LastError);
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}
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}
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