使用_outp()时出现未处理的异常

问题描述

我正在使用_outp(0x378,0xAA)在Windows 7中以C语言在计算机的并行端口中写入数据，它已编译，但在运行时给出了以下错误，

"Parallel_Port.exe中0x00d413c5处未处理的异常:0xC0000096:特权指令"

谁能建议我该怎么做.

谢谢&问候
Mohan

Hi,
I''m using _outp(0x378,0xAA) for writing data in the parallel port of the computer in C language in Windows 7, it gets compiled but it gives the below error at run time,

"Unhandled exception at 0x00d413c5 in Parallel_Port.exe: 0xC0000096: Privileged instruction"

Can anyone suggest me what I have to do.

Thanks & Regards
Mohan

推荐答案

#include <windows.h>
#include <stdio.h>

void main(void)
{
	HANDLE hPort = CreateFile("LPT1",GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
	if(hPort != INVALID_HANDLE_VALUE){
		char buffer[5] = {''h'',''e'',''l'',''l'',''o''};
		unsigned long count;

		if(WriteFile(hPort, buffer, 5, &count, 0))
			printf("Write succesful.\n");
		else
			printf("Write failed\n");

		CloseHandle(hPort);
	}
	else
		printf("Unable to access LPT1.");

}

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