下面的代码允许您传递一个组件来获取它的窗口句柄 (HWND)。为了确保一个组件有一个对应的窗口句柄,在组件上调用 isLightWeight() 并验证它是否等于 false。如果没有,请通过调用 Component.getParent() 尝试它的父级。
Java代码:
package win32;
public class Win32 {
public static native int getWindowHandle(Component c);
}
头文件 main.h:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class win32_Win32 */
#ifndef _Included_win32_Win32
#define _Included_win32_Win32
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: win32_Win32
* Method: getWindowHandle
* Signature: (Ljava/awt/Component;Ljava/lang/String;)I
*/
JNIEXPORT jint JNICALL Java_win32_Win32_getWindowHandle
(JNIEnv *, jclass, jobject);
#ifdef __cplusplus
}
#endif
#endif
C 源代码 main.c:
#include<windows.h>
#include <jni.h>
#include <jawt.h>
#include <jawt_md.h>
HMODULE _hAWT = 0;
JNIEXPORT jint JNICALL Java_win32_Win32_getWindowHandle
(JNIEnv * env, jclass cls, jobject comp)
{
HWND hWnd = 0;
typedef jboolean (JNICALL *PJAWT_GETAWT)(JNIEnv*, JAWT*);
JAWT awt;
JAWT_DrawingSurface* ds;
JAWT_DrawingSurfaceInfo* dsi;
JAWT_Win32DrawingSurfaceInfo* dsi_win;
jboolean result;
jint lock;
//Load AWT Library
if(!_hAWT)
//for Java 1.4
_hAWT = LoadLibrary("jawt.dll");
if(!_hAWT)
//for Java 1.3
_hAWT = LoadLibrary("awt.dll");
if(_hAWT)
{
PJAWT_GETAWT JAWT_GetAWT = (PJAWT_GETAWT)GetProcAddress(_hAWT, "_JAWT_GetAWT@8");
if(JAWT_GetAWT)
{
awt.version = JAWT_VERSION_1_4; // Init here with JAWT_VERSION_1_3 or JAWT_VERSION_1_4
//Get AWT API Interface
result = JAWT_GetAWT(env, &awt);
if(result != JNI_FALSE)
{
ds = awt.GetDrawingSurface(env, comp);
if(ds != NULL)
{
lock = ds->Lock(ds);
if((lock & JAWT_LOCK_ERROR) == 0)
{
dsi = ds->GetDrawingSurfaceInfo(ds);
if(dsi)
{
dsi_win = (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo;
if(dsi_win)
{
hWnd = dsi_win->hwnd;
}
else {
hWnd = (HWND) -1;
}
ds->FreeDrawingSurfaceInfo(dsi);
}
else {
hWnd = (HWND) -2;
}
ds->Unlock(ds);
}
else {
hWnd = (HWND) -3;
}
awt.FreeDrawingSurface(ds);
}
else {
hWnd = (HWND) -4;
}
}
else {
hWnd = (HWND) -5;
}
}
else {
hWnd = (HWND) -6;
}
}
else {
hWnd = (HWND) -7;
}
return (jint)hWnd;
}