我正在尝试使用JNA,这是我尝试运行的第一个程序。我从引用中复制了它,但是,当我运行它时,他找到了412个窗口......而且我很确定我现在没有那么多窗口打开了:)可以请有人向我解释程序的行为吗?
import com.sun.jna.Pointer;
import com.sun.jna.win32.StdCallLibrary.StdCallCallback;
import com.sun.jna.Native;
import com.sun.jna.win32.StdCallLibrary;
public class Main {
// Equivalent JNA mappings
public interface User32 extends StdCallLibrary {
User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);
interface WNDENUMPROC extends StdCallCallback {
boolean callback(Pointer hWnd, Pointer arg);
}
boolean EnumWindows(WNDENUMPROC lpEnumFunc, Pointer arg);
}
public static void main(String[] args) {
User32 user32 = User32.INSTANCE;
user32.EnumWindows(new User32.WNDENUMPROC() {
int count;
public boolean callback(Pointer hWnd, Pointer userData) {
System.out.println("Found window " + hWnd + ", total " + ++count);
return true;
}
}, null);
}
}
答案 0 :(得分:8)
在Windows中,几乎所有东西都是Window。以下是对代码的一些更改,这些更改将显示一些窗口标题/文本:
import com.sun.jna.Pointer;
import com.sun.jna.Native;
import com.sun.jna.win32.StdCallLibrary;
public class JNA_Main {
// Equivalent JNA mappings
public interface User32 extends StdCallLibrary {
User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);
interface WNDENUMPROC extends StdCallCallback {
boolean callback(Pointer hWnd, Pointer arg);
}
boolean EnumWindows(WNDENUMPROC lpEnumFunc, Pointer arg);
int GetWindowTextA(Pointer hWnd, byte[] lpString, int nMaxCount);
}
public static void main(String[] args) {
final User32 user32 = User32.INSTANCE;
user32.EnumWindows(new User32.WNDENUMPROC() {
int count;
public boolean callback(Pointer hWnd, Pointer userData) {
byte[] windowText = new byte[512];
user32.GetWindowTextA(hWnd, windowText, 512);
String wText = Native.toString(windowText);
wText = (wText.isEmpty()) ? "" : "; text: " + wText;
System.out.println("Found window " + hWnd + ", total " + ++count + wText);
return true;
}
}, null);
}
}
请询问是否有任何不清楚的地方。