动态加载exe文件 [英] Dynamically loading exe file

问题描述

我正在尝试从我的程序动态加载一个exe文件，并从动态加载的exe运行SomeProcedure。这是我正在加载的exe - library.exe

I'm trying to dynamically load an exe file from my program and run SomeProcedure from that dynamicaly loaded exe. Here's what I'm doing in loaded exe - library.exe

interface    

procedure SomeProcedure; stdcall;

implementation    

procedure SomeProcedure;
begin
  ShowMessage('Ala has a cat');
end;

这是我的exe，加载的library.exe，并尝试运行SomeProcedure从它。

And here's my exe that load's library.exe and try to run SomeProcedure from it.

type
  THandle = Integer;
  TProc = procedure();

var
  AHandle: THandle;
  Proc: TProc;

procedure TForm1.Button1Click(Sender: TObject);
begin
  AHandle := LoadLibrary('library.exe');
  if AHandle <> 0 then begin
    @Proc := GetProcAddress(AHandle, 'SomeProcedure');
    if @Proc <> nil then 
      try    
        Proc;
      finally
        FreeLibrary(AHandle);
      end;
    end;
  end;
end;

不幸的是它不工作 - AHandle有一个地址，但GetProcAddress总是返回nil。我做错了什么？

Unfortunately it's not working - AHandle has an address but GetProcAddress always returns nil. What am I doing wrong?

推荐答案

据我所知，你所尝试的是不可能的。您不能使用LoadLibrary加载.exe文件，然后调用其导出的函数。您只能将一个.exe文件加载到进程中。您需要将功能移动到库，或COM服务器或其他解决方案。

To the very best of my knowledge, what you are attempting is not possible. You cannot use LoadLibrary to load a .exe file, and then call its exported functions. You can only have one .exe file loaded into a process. You'll need to move the functionality into a library, or a COM server, or some other solution.

正如Sertac指出的那样，文档覆盖：

As Sertac points out, the documentation does cover this:

LoadLibrary也可用于加载其他可执行模块。例如，该函数可以指定.exe文件
以获取可用于FindResource或LoadResource的句柄。但是，不要使用LoadLibrary来运行.exe文件。而是使用CreateProcess函数。

LoadLibrary can also be used to load other executable modules. For example, the function can specify an .exe file to get a handle that can be used in FindResource or LoadResource. However, do not use LoadLibrary to run an .exe file. Instead, use the CreateProcess function.

您可以使用GetProcAddress与可执行文件的模块句柄。但是您必须通过调用GetModuleHandle（0）来获取模块句柄。例如，

You can use GetProcAddress with the module handle of an executable. But you have to obtain the module handle by calling GetModuleHandle(0), for example.

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