Source code of Windows XP (NT5)
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206 lines
5.2 KiB

//
// Read from the comm 1 char at a time.
//
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "windows.h"
#define BIGREAD 256000
unsigned char readbuff[BIGREAD];
void main(int argc,char *argv[]) {
HANDLE hFile;
DCB MyDcb;
char *MyPort = "COM1";
DWORD NumberActuallyRead;
DWORD NumberToRead = 0;
DWORD UseBaud = 19200;
COMMTIMEOUTS To;
if (argc > 1) {
sscanf(argv[1],"%d",&NumberToRead);
if (argc > 2) {
sscanf(argv[2],"%d",&UseBaud);
if (argc > 3) {
MyPort = argv[3];
}
}
}
printf("Will try to read %d characters.\n",NumberToRead);
printf("Will try to read a %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);
To.ReadIntervalTimeout = 0;
To.ReadTotalTimeoutMultiplier = ((1000+(((UseBaud+9)/10)-1))/((UseBaud+9)/10));
if (!To.ReadTotalTimeoutMultiplier) {
To.ReadTotalTimeoutMultiplier = 1;
}
printf("Multiplier is: %d\n",To.ReadTotalTimeoutMultiplier);
To.ReadTotalTimeoutConstant = 5000;
To.WriteTotalTimeoutMultiplier = 0;
To.WriteTotalTimeoutConstant = 5000;
if (SetCommTimeouts(
hFile,
&To
)) {
//
// 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;
if (SetCommState(
hFile,
&MyDcb
)) {
DWORD CurrentReadIt = 0;
DWORD CurrentActualRead = 0;
unsigned char j;
DWORD TotalCount;
NumberActuallyRead = 0;
printf("We successfully set the state of the %s port.\n",MyPort);
printf("Hit any 1 <cr> to start reading: ");
scanf("%d",&CurrentReadIt);
for (
CurrentReadIt = 0;
CurrentReadIt < NumberToRead;
CurrentReadIt++
) {
if (ReadFile(
hFile,
&readbuff[CurrentReadIt],
1,
&CurrentActualRead,
NULL
)) {
if (CurrentActualRead != 1) {
printf("Iteration %d read %d\n",CurrentReadIt,CurrentActualRead);
break;
} else {
NumberActuallyRead++;
}
} else {
DWORD LastError;
LastError = GetLastError();
printf("Status of failed %d read is: %x\n",CurrentReadIt,LastError);
break;
}
}
printf("Number actually read %d.\n",NumberActuallyRead);
printf("Now we check the data\n");
for (
TotalCount = 0;
TotalCount < NumberActuallyRead;
) {
for (
j = 0;
j <= 9;
j++
) {
if (readbuff[TotalCount] != j) {
printf("Bad data starting at: %d\n",TotalCount);
goto donewithcheck;
}
TotalCount++;
if (TotalCount >= NumberActuallyRead) {
break;
}
}
}
donewithcheck:;
} else {
DWORD LastError;
LastError = GetLastError();
printf("Couldn't set the %s device.\n",MyPort);
printf("Status of failed set is: %x\n",LastError);
}
} else {
DWORD LastError;
LastError = GetLastError();
printf("Couldn't set the %s device timeouts.\n",MyPort);
printf("Status of failed timeouts 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);
}
}