Source code of Windows XP (NT5)
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173 lines
4.1 KiB

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "windows.h"
#define BIGWRITE 256000
unsigned char writebuff[BIGWRITE];
int __cdecl main(int argc,char *argv[]) {
HANDLE hFile;
DCB MyDcb;
char *MyPort = "COM1";
DWORD NumberActuallyWritten;
DWORD NumberToWrite = 0;
DWORD UseBaud = 19200;
COMMTIMEOUTS To;
clock_t Start;
clock_t Finish;
if (argc > 1) {
sscanf(argv[1],"%d",&NumberToWrite);
if (argc > 2) {
sscanf(argv[2],"%d",&UseBaud);
if (argc > 3) {
MyPort = argv[3];
}
}
}
printf("Will try to write %d characters.\n",NumberToWrite);
printf("Will try to write at %d baud.\n",UseBaud);
printf("Using port: %s\n",MyPort);
if ((hFile = CreateFile(
MyPort,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
NULL
)) != ((HANDLE)-1)) {
printf("We successfully opened the %s port.\n",MyPort);
//
// We've successfully opened the file. Set the state of
// the comm device. First we get the old values and
// adjust to our own.
//
if (!GetCommState(
hFile,
&MyDcb
)) {
printf("Couldn't get the comm state: %d\n",GetLastError());
exit(1);
}
MyDcb.BaudRate = UseBaud;
MyDcb.ByteSize = 8;
MyDcb.Parity = NOPARITY;
MyDcb.StopBits = ONESTOPBIT;
MyDcb.fOutxCtsFlow = TRUE;
MyDcb.fOutxDsrFlow = TRUE;
MyDcb.fDtrControl = DTR_CONTROL_ENABLE;
MyDcb.fRtsControl = RTS_CONTROL_ENABLE;
To.ReadIntervalTimeout = 0;
To.ReadTotalTimeoutMultiplier = 0;
To.ReadTotalTimeoutConstant = 0;
To.WriteTotalTimeoutMultiplier = 0;
To.WriteTotalTimeoutConstant = 0;
SetCommTimeouts(
hFile,
&To
);
if (SetCommState(
hFile,
&MyDcb
)) {
unsigned char j;
DWORD TotalCount;
printf("We successfully set the state of the %s port.\n",MyPort);
for (
TotalCount = 0;
TotalCount < NumberToWrite;
) {
for (
j = 0;
j <= 9;
j++
) {
writebuff[TotalCount] = j;
TotalCount++;
if (TotalCount >= NumberToWrite) {
break;
}
}
}
Start = clock();
if (WriteFile(
hFile,
writebuff,
NumberToWrite,
&NumberActuallyWritten,
NULL
)) {
Finish = clock();
printf("Time to write %f\n",(((double)(Finish-Start))/CLOCKS_PER_SEC));
printf("Chars per second %f\n",((double)NumberActuallyWritten)/(((double)(Finish-Start))/CLOCKS_PER_SEC));
printf("Well we thought the write went ok.\n");
printf("Number actually written %d.\n",NumberActuallyWritten);
} else {
DWORD LastError;
LastError = GetLastError();
printf("Couldn't write the %s device.\n",MyPort);
printf("Status of failed write is: %x\n",LastError);
}
} else {
DWORD LastError;
LastError = GetLastError();
printf("Couldn't set the %s device.\n",MyPort);
printf("Status of failed set is: %x\n",LastError);
}
CloseHandle(hFile);
} else {
DWORD LastError;
LastError = GetLastError();
printf("Couldn't open the %s device.\n",MyPort);
printf("Status of failed open is: %x\n",LastError);
}
}