Source code of Windows XP (NT5)
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256 lines
6.8 KiB

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "windows.h"
#define BIGREAD 256000
unsigned char readbuff[BIGREAD];
int __cdecl main(int argc,char *argv[]) {
HANDLE hFile;
DCB MyDcb;
char *MyPort = "COM1";
DWORD NumberActuallyRead;
DWORD NumberToRead = 0;
DWORD UseBaud = 19200;
COMMTIMEOUTS To;
clock_t Start;
clock_t Finish;
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;
MyDcb.fOutxCtsFlow = TRUE;
MyDcb.fOutxDsrFlow = TRUE;
MyDcb.fDtrControl = DTR_CONTROL_ENABLE;
MyDcb.fRtsControl = RTS_CONTROL_ENABLE;
if (SetCommState(
hFile,
&MyDcb
)) {
printf("We successfully set the state of the %s port.\n",MyPort);
Start = clock();
if (ReadFile(
hFile,
readbuff,
NumberToRead,
&NumberActuallyRead,
NULL
)) {
unsigned char j;
DWORD TotalCount;
Finish = clock();
printf("Well we thought the read went ok.\n");
printf("Number actually read %d.\n",NumberActuallyRead);
printf("Now we check the data\n");
// printf("Time to read %f\n",(((double)(Finish-Start))/CLOCKS_PER_SEC));
// printf("Chars per second %f\n",((double)NumberActuallyRead)/(((double)(Finish-Start))/CLOCKS_PER_SEC));
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 read the %s device.\n",MyPort);
printf("Status of failed read is: %d\n",LastError);
//
// Get the error word from clear comm error.
//
if (!ClearCommError(
hFile,
&LastError,
NULL
)) {
printf("Couldn't call clear comm error: %d\n",GetLastError());
exit(1);
} else {
if (!LastError) {
printf("No LastError\n");
} else {
if (LastError & CE_RXOVER) {
printf("Error: CE_RXOVER\n");
}
if (LastError & CE_OVERRUN) {
printf("Error: CE_OVERRUN\n");
}
if (LastError & CE_RXPARITY) {
printf("Error: CE_RXPARITY\n");
}
if (LastError & CE_FRAME) {
printf("Error: CE_FRAME\n");
}
if (LastError & CE_BREAK) {
printf("Error: CE_BREAK\n");
}
if (LastError & ~(CE_RXOVER |
CE_OVERRUN |
CE_RXPARITY |
CE_FRAME |
CE_BREAK)) {
printf("Unknown errors: %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);
}
} 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);
}
}