Delphi Prism获得未知标识符“ DllImport”。错误

问题描述

我试图在Delphi Prism中调用Window的SendMessage方法，我声明了以下类：

I'm trying to call Window's SendMessage method in Delphi Prism, I've declared the class as follow:

type
  MyUtils = public static class
  private
    [DllImport("user32.dll", CharSet := CharSet.Auto)]
    method SendMessage(hWnd:IntPtr; Msg:UInt32; wParam:IntPtr; lParam:IntPtr):IntPtr; external;
  protected
  public
  end;

当我尝试编译时，出现错误 Unknown identifier DllImport

When I tried to compile, I get the error Unknown identifier "DllImport"

我以此为例，，语法看起来是一样的。有需要启用的设置，还是语法错误？

I used this as an example, How to call function CreateProcess in Delphi Prism? and the syntax looks the same. Is there a setting I need to enable, or do I have a syntax error?

推荐答案

请确保您导入（使用） System.Runtime.InteropServices 。这就是定义DllImport属性的地方。

Make sure you import (use) System.Runtime.InteropServices. That's where the DllImport attribute is defined.

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