qt学习（二）：启动画面

打开一个软件，都会有启动画面。

现在去体验如何实现启动画面：输入图，装载，延时，下一张主部件图

在main。Cpp中实现启动时桌面图片。

#include <QtGui/QApplication>

#include "mainwindow.h"

#include <QSplashScreen>//屏幕头文件

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

MainWindow w;

QPixmap pixmap("ee"); // 1，传图片

QSplashScreen splash(pixmap);//装载图

splash.show();//显示图

for(long index = 0; index < 1000000000; index++);//显示延时

splash.finish(&w);

w.show();

return a.exec();

}

1 QPixmap::QPixmap ( const char * const[] xpm )

Constructs a pixmap from the given xpm data, which must be a valid XPM image.

Errors are silently ignored.

Note that it's possible to squeeze the XPM variable a little bit by using an unusual declaration:

static const char * const start_xpm[]={

"16 15 8 1", "a c #cec6bd", 。。。。

1 ----------输入图：

Qpixmap类需要一些可用的图片，（.png），输入图片名，图存镜像文件夹下，传进来实现构造Qpixmap对象。

如：QPixmap pixmap("ee"); //传图片

2．

QSplashScreen::QSplashScreen ( const QPixmap & pixmap = QPixmap(), Qt::WindowFlags f = 0 )

Construct a splash screen that will display the pixmap.

There should be no need to set the widget flags, f, except perhaps Qt::WindowStaysOnTopHint.

This is illustrated in the following code snippet in which a splash screen is displayed and some initialization tasks are performed before the application's main window is shown:

2----------转载图：

传入照片后还是要构造一个溅起图片的媒介对象，就是需要利用第一个对象实现第二个对象的构造，用的时候把pixmap对象传给它，通常在main的主框之前显示

QSplashScreen splash(pixmap);//装载图

3

void	finish ( QWidget * mainWin )

Makes the splash screen wait until the widget mainWin is displayed before calling close() on itself.

3 -----关闭图：

显示主窗口前，闪屏会等到它出现再关闭自己

splash.finish(&w); //w是主布局的对象