使用 JNA 链接到自定义 dll [英] Using JNA to link to custom dll

问题描述

如何使用 JNA 访问自定义 .lib/.dll 函数?有人能举个例子吗?

how do I access custom .lib / .dll functions using JNA? Can someone provide an example?

谢谢.

推荐答案

示例(来自维基百科):

import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.Native;

/** Simple example of Windows native library declaration and usage. */
public class BeepExample {
   public interface Kernel32 extends StdCallLibrary {
       // FREQUENCY is expressed in hertz and ranges from 37 to 32767
       // DURATION is expressed in milliseconds
       public boolean Beep(int FREQUENCY, int DURATION);
       public void Sleep(int DURATION);
   }
   public static void main(String[] args) {
    Kernel32 lib = (Kernel32) Native.loadLibrary("kernel32", 
           Kernel32.class);
    lib.Beep(698, 500);
    lib.Sleep(500);
    lib.Beep(698, 500);
   }
}

在这种情况下，我们从kernel32.dll"库加载它.我希望这能让 JNA 更清楚.

In this case, we load it from the "kernel32.dll" library. I hope this makes JNA clearer.

我将解释代码:您需要使用库中所需的函数定义一个接口(扩展 com.sun.jna.Library).然后，调用 com.sun.jna.Native.loadLibrary("LibraryName", InterfaceName.class).最后，将输出存储在具有接口类型的变量中.只需从该变量调用函数即可.

I'll explain the code: You need to define an interface(that extends com.sun.jna.Library) with the functions you need from the library. Then, call com.sun.jna.Native.loadLibrary("LibraryName", InterfaceName.class). Finally, store the output in a variable with the type of the interface. Just call the functions from that variable.

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