使用_outp()时出现未处理的异常 [英] Unhandled exception when using _outp()

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

Windows XP和2000不允许您直接写入硬件.您必须通过驱动程序执行此操作.
您可以做的是访问 http://www.beyondlogic.org [ 使用此程序，您可以直接写入硬件或使用Windows API来实现.

Windows XP and 2000 do not allow you to write directly to the hardware. You have to do this through drivers.
What you can do is visit http://www.beyondlogic.org[^] and download a program called "Port Talk".
Using this program, you can write directly to the hardware or use windows API for same.

Laxmikant_Yadav是正确的，现代Windows版本不允许您直接写入硬件.如果要在Windows 9x或MS-DOS计算机上运行程序，则不会出现冲突错误.

要使用Windows API写入并行端口，使其也适用于现代Windows版本，您可以编写如下内容:

Laxmikant_Yadav is right, modern Windows versions do not allow you to write directly to hardware. If you were to run your program on a Windows 9x or MS-DOS machine it wouldn''t give you a violation error.

To write to the parallel port using the Windows API, so it works with modern Windows versions as well, you could write something like this:

#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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