如何调用DOS中使用内联汇编一个C / C ++程序中的中断？ [英] How to call DOS Interrupts within a C/C++ program using Inline Assembly?

问题描述

大家好！
我需要调用从C / C ++程序的一些DOS中断（服务），我尝试了下面的内联汇编code：
（读取一个字符）

  INT的main（）
{
ASM（
 MOVB $ 0×01，％啊;
 INT $ 0×21
 ）;
系统（暂停）;
}
 

但它没有工作！我想知道我做了什么错在这里！此外，如果有另一种方式来调用DOS中断！
谢谢！

解决方案

您只能使用DOS，从DOS程序中断，所以，使这项工作，你需要一个非常古老的C ++编译器像Visual C ++ 1.0或1.5，或的Turbo C ++ / Borland的C ++向上穿过像4.5或5.0可能。然后，你就必须解决您的装配code - 你写的是什么样子AT＆amp; T公司的语法，但所有的DOS的编译器我知道采用Intel语法。有一个半例外情况：djgcc。这GCC的一个古老的版本，一个DOS扩展下运行，所以它使用AT＆amp; T公司的语法，而且还支持一组类似DOS中断的（虽然你真的使用DOS扩展，而不是DOS本身）

即使这样，该程序将只支持DOS程序（和微软正在快速下探，从窗户 - 例如，它在Windows中的所有x64版本不存在）的系统上运行。

。

DOS已经过时了足够长的时间，编写新的code它没有意义。如果你想读这样的键，编写Windows程序，使用类似的 ReadConsoleInput 来代替。

编辑：好吧，如果你真的想这样做，明显的方法是选择一个 DOS扩展和端口的当前版本的GCC它。另一种可能性是挑选像 OpenWatcom 或的数字火星这仍然维持并已经移植到的 DOS扩展。

everyone ! I need to call some DOS interrupts (Services) from a C/C++ program, I tried the following inline asm code: (Read a character)

int main()
{
asm(
 "movb $0x01, %ah;"
 "int $0x21"
 );
system("PAUSE");
}

But it did not work ! I would like to know what have i done wrong here ! Also if there is another way to call dos interrupts ! Thank You !

解决方案

You can only use DOS interrupts from DOS programs, so to make this work, you'd need a really ancient C++ compiler like Visual C++ 1.0 or 1.5, or Turbo C++/Borland C++ up through something like 4.5 or possibly 5.0. Then you'd have to fix your assembly code -- what you've written looks like AT&T syntax, but all the DOS compilers of which I'm aware use Intel syntax. There is one semi-exception to that: djgcc. This an ancient version of gcc that runs under a DOS extender, so it uses AT&T syntax, and still supports a set of DOS-like interrupts (though you're really using the DOS extender, not DOS per se).

Even then, the program would only run on a system that supports DOS programs (and Microsoft is quickly dropping that from windows -- e.g., it's absent in all the x64 versions of Windows).

DOS has been obsolete long enough that writing new code for it doesn't make sense. If you want to read a key like that, write a Windows program, and use something like ReadConsoleInput instead.

Edit: Okay, if you really want to do this, the obvious way would be to pick a DOS extender and port a current version of gcc to it. The other possibility would be to pick a compiler like OpenWatcom or Digital Mars that's still maintained and already ported to a DOS extender.

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