java 使用 JNA 链接到自定义 dll
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Using JNA to link to custom dll
提问by luiscubal
how do I access custom .lib / .dll functions using JNA? Can someone provide an example?
如何使用 JNA 访问自定义 .lib / .dll 函数？有人可以提供一个例子吗？
Thank you.
谢谢你。
回答by luiscubal
Example (from Wikipedia):
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);
}
}
In this case, we load it from the "kernel32.dll" library. I hope this makes JNA clearer.
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。
EDIT: 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.
编辑：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。
