发现个delphi调用vc写的Dll中包含pchar参数报错奇怪现象

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发现个delphi调用vc写的Dll中包含pchar参数奇怪现象

procedure中的第一行语句不能直接调用DLL的函数,否则会运行报错,在之前任意加上条语句就不报错了奇怪！

vc的DLL源码地址 http://blog.csdn.net/lqena/article/details/46357165

Delphi源码如下:

unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    btn1: TButton;    procedure btn1Click(Sender: TObject);  private    { Private declarations }  public    { Public declarations }  end;var  Form1: TForm1;implementation{$R *.dfm}function GetStr(s:PChar):PChar; stdcall; external 'MyDLL.dll';procedure TForm1.btn1Click(Sender: TObject);var  p  :PChar;  s:string;begin  s:='123'; //procedure中的第一行语句不能直接调用GetStr,否则会运行报错,加上这行语句不报错了奇怪   p:= GetStr('63024823'); //接收必须是PChar,如果String可以编译通过,但运行报错  ShowMessage(p);end;end.

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