在上一篇博客中,已经介绍了wallpaper的实现原理,并用C#实现,本文将使用C++和Qt框架实现,由于之前已经介绍过具体思路,本文将跳过分析过程,直接上代码.
新建Qt项目,系统自动生成widget.h,widget.cpp,main.cpp.
我们将使用widget作为主窗体
窗体设计
在项目pro里加上
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| QT += multimedia multimediawidgets
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widget里添加头文件
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| #include <QVideoWidget>
#include <QMediaPlayer>
#include <QMediaPlaylist>
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创建播放器和播放窗口
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| QVideoWidget videoWidget;
QMediaPlayer player;
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在设计界面添加四个按钮,添加槽函数
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| private slots:
void on_openButton_clicked();
void on_playButton_clicked();
void on_pauseButton_clicked();
void on_exitButton_clicked();
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获取背景层窗体句柄
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| HWND GetBackground(){
HWND background = NULL;
HWND hwnd = FindWindowA("progman","Program Manager");
HWND worker = NULL;
do{
worker = FindWindowExA(NULL,worker,"workerW",NULL);
if(worker != NULL){
char buff[200] = {0};
int ret = GetClassNameA(worker,(PCHAR)buff, sizeof(buff) * 2);
if(ret == 0) {
return NULL;
}
}
if(GetParent(worker) == hwnd){
background = worker;
}
} while (worker != NULL);
return background;
}
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这里有可能会返回NULL,因为某些系统没有WorkerW窗体,可以在GetBackground()里加上下面这句代码
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| SendMessage(hwnd,0x052C,0,0);
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最终代码
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HWND GetBackground() {
HWND hwnd = FindWindowA("progman", "Program Manager");
HWND worker = NULL;
do {
worker = FindWindowExA(NULL, worker, "workerW", NULL);
if (worker != NULL) {
char buff[200] = {0};
int ret = GetClassNameA(worker, (PCHAR) buff, sizeof(buff) * 2);
if (ret == 0) {
return NULL;
}
}
if (GetParent(worker) == hwnd) {
return worker;
}
} while (worker != NULL);
SendMessage(hwnd,0x052C,0,0);
do {
worker = FindWindowExA(NULL, worker, "workerW", NULL);
if (worker != NULL) {
char buff[200] = {0};
int ret = GetClassNameA(worker, (PCHAR) buff, sizeof(buff) * 2);
if (ret == 0) {
return NULL;
}
}
if (GetParent(worker) == hwnd) {
return worker;
}
} while (worker != NULL);
return NULL;
}
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在C#制作动态壁纸软件时,我专门为刷新背景做了一个exe文件,因此这里可以直接调用
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| void ReFreshBackground(){
WinExec("D:\\documents\\Wallpaper\\ReFreshBackground.exe",0);
}
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当我们点击“打开”按钮时,如果是第一次打开,需要新建窗体并设置为背景层窗体的子窗体,而之后就不用了,因此设立布尔变量firstPlay来判断是否第一次打开文件
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| bool firstPlay = true;
void Widget::on_openButton_clicked()
{
QString file = QFileDialog::getOpenFileName(
this,
"打开文件",
"",
"");
if(!file.isEmpty()){
if(firstPlay){
HWND hwnd = (HWND) videoWidget.winId();
SetBackground(hwnd);
videoWidget.setWindowFlags(Qt::FramelessWindowHint);
videoWidget.showFullScreen();
firstPlay = false;
}
player.setMedia(QMediaContent(QUrl::fromLocalFile(file)));
player.setVideoOutput(&videoWidget);
player.play();
}
}
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给别的按钮设置槽函数
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| void Widget::on_playButton_clicked()
{
player.play();
}
void Widget::on_pauseButton_clicked()
{
player.pause();
}
void Widget::on_exitButton_clicked()
{
if(!firstPlay){
ReFreshBackground();
}
qApp->exit(0);
}
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在退出时也需要先判断是否打开了文件,如果没有打开,则不需要刷新壁纸.
将child窗体设置为背景层窗体的子窗体
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| void SetBackground(HWND child){
SetParent(child,GetBackground());
}
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最终效果
内存和GPU占用
如果出现0x80040266错误,是因为你没有安装LAVFilters
(安装后重启电脑)
