windows 启动画面的透明度
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Transparency in splash screen
提问by OrElse
I saw the splash screen of the Corel-Draw 12 application and lost my mind!
我看到 Corel-Draw 12 应用程序的启动画面，我失去了理智！
What technique do they use? On application start-up they load a transparent image, use windows api or what?
他们使用什么技术？在应用程序启动时，他们加载透明图像，使用 windows api 还是什么？
How do they achieve this transparency?
他们如何实现这种透明度？
回答by jheddings
Here is a demo projectfor both VB.NET & C#.
回答by Quintin Robinson
If you are using winforms with vb.net you can modify the opacity of any form by setting the Form.Opacityproperty. I am not familiar with the splash screen you are speaking about but it shouldn't be too difficult to achieve a similar effect.
如果您在 vb.net 中使用 winforms，您可以通过设置Form.Opacity属性来修改任何表单的不透明度。我不熟悉你所说的启动画面，但要达到类似的效果应该不会太难。
回答by Justin R.
If you're using WPF, set the AllowsTransparancy, WindowStyleand Backgroundattributes on the Window object:
如果您使用 WPF，请在 Window 对象上设置AllowsTransparancy,WindowStyle和Background属性：
<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
AllowsTransparency="True"
WindowStyle="None"
Background="Transparent">
<!-- more -->
</Window>
回答by Jrud
I am also unfamiliar with this flash screen... but if it slowly fades or something, then I would go with Quintin's answer here. Opacity at a certain percentage will show another form through yours.
我也不熟悉这个闪光屏幕......但如果它慢慢消失或其他什么，那么我会在这里接受 Quintin 的回答。一定百分比的不透明度将通过您的形式显示另一种形式。
If the splash screen is just an image and some of it is see-through and some of it isn't, then you can set the transparency key on your form to a certain color, then set the form's background color equal to that, and then whatever image you wish to display should be loaded into a picture box. Make sure you use a .GIF image though! or some other format that supports deleting out the background. JPG's and BMP's are worthless here since their "empty" color becomes white instead of transparent.
如果初始屏幕只是一个图像，其中一些是透明的，而另一些不是，那么您可以将表单上的透明度键设置为某种颜色，然后将表单的背景颜色设置为等于该颜色，并且那么你想显示的任何图像都应该加载到图片框中。但请确保使用 .GIF 图像！或其他一些支持删除背景的格式。JPG 和 BMP 在这里毫无价值，因为它们的“空”颜色变为白色而不是透明。
