调用一个函数，它可以是的cdecl或STDCALL [英] Calling a function that can be either cdecl or stdcall

问题描述

我需要写code调用，可以在32位Windows应用程序，无论是STDCALL调用或CDECL外部函数。结果
我的code，来电，也不能提前知道哪个这些公司将是。
现在，如果我尝试调用从被定义为STDCALL调用网站的cdecl函数，我得到一个checkEsp例外对话框，然后我猜这是有一个很好的理由。结果
有没有办法做到这一点？

I need to write code that calls an external function that can be either stdcall call or cdecl in a 32bit windows application.
My code, the caller, can't know in advance which of these its going to be. Right now, if I try to call a cdecl function from a call site that was defined as stdcall, I get a checkEsp exception dialog, and I'm guessing that's there for a good reason.
Is there any way to do it?

推荐答案

它可以下列方式进行：

          mov     esi, esp

          push    arg3
          push    arg2
          push    arg1
          call    [SomeExternalProc]

          mov     esp, esi   ; now the stack is always properly cleaned 

外部程序应preserve ESI。或者你可以使用由外部程序，甚至内存变量pserved任何其他寄存器$ P $ - 局部或全局

The external procedure should preserve esi. Or you can use any other register preserved by the external procedure or even memory variable - local or global.

好，参数的顺序是CDECL和STDCALL一样 - 以相反的顺序

Good, the order of the arguments is the same for CDECL and STDCALL - in reverse order.

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