使用嵌入式x86汇编数组？ [英] Using an array in embedded x86 assembly?

问题描述

我有一个方法（C ++），返回一个字符，采取字符数组作为它的参数。

I have a method (C++) that returns a character and takes an array of characters as its parameters.

我和装配搞乱首次，只是试图返回数组的第一个字符在DL寄存器中。这是我到目前为止有：

I'm messing with assembly for the first time and just trying to return the first character of the array in the dl register. Here's what I have so far:

char returnFirstChar(char arrayOfLetters[])
{
 char max;

 __asm
 {
  push eax
      push ebx
       push ecx
     push edx
  mov dl, 0

  mov eax, arrayOfLetters[0]
  xor edx, edx
  mov dl, al

  mov max, dl       
  pop edx
  pop ecx
  pop ebx
  pop eax

 }

 return max;
}

由于某种原因，这个方法返回一个♀

For some reason this method returns a ♀

任何想法去上什么？谢谢

Any idea whats going on? Thanks

推荐答案

组件的行：

mov eax, arrayOfLetters[0]

移动一个指针字符数组 EAX （注意，这不是 arrayOfLetters [0] 会做在C，但装配不C）。

is moving a pointer to the array of characters into eax (note, that's not what arrayOfLetters[0] would do in C, but assembly isn't C).

您需要添加下列正确的是让你的装配工作的点点后：

You'll need to add the following right after it to make your little bit of assembly work:

mov al, [eax]

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