我知道How to design a cool semi transparent splash screen。
我已经制作了png图像，并将其设置为C＃应用程序的表单背景图像。
我已将表单的BackColor和TransparentKey颜色设置为洋红色。如果有帮助，我还将DoubleBuffer设置为True。
但是，当我运行该应用程序时，表单周围会出现很多杂音。
有我不知道的我想念的东西吗？
最佳答案
感谢codeproject.com上的Rui Godinho Lopes (rui@Rui lopes.com) Per Pixel Alpha Blend post，我找到了一种解决问题的方法
首先，我将PerPixelAlphaForm添加到我的项目中。
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Runtime.InteropServices;
// class that exposes needed win32 gdi functions.
class Win32
{
public enum Bool
{
False= 0,
True
};
[StructLayout(LayoutKind.Sequential)]
public struct Point
{
public Int32 x;
public Int32 y;
public Point(Int32 x, Int32 y) { this.x= x; this.y= y; }
}
[StructLayout(LayoutKind.Sequential)]
public struct Size {
public Int32 cx;
public Int32 cy;
public Size(Int32 cx, Int32 cy) { this.cx= cx; this.cy= cy; }
}
[StructLayout(LayoutKind.Sequential, Pack=1)]
struct ARGB
{
public byte Blue;
public byte Green;
public byte Red;
public byte Alpha;
}
[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct BLENDFUNCTION
{
public byte BlendOp;
public byte BlendFlags;
public byte SourceConstantAlpha;
public byte AlphaFormat;
}
public const Int32 ULW_COLORKEY = 0x00000001;
public const Int32 ULW_ALPHA = 0x00000002;
public const Int32 ULW_OPAQUE = 0x00000004;
public const byte AC_SRC_OVER = 0x00;
public const byte AC_SRC_ALPHA = 0x01;
[DllImport("user32.dll", ExactSpelling=true, SetLastError=true)]
public static extern Bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);
[DllImport("user32.dll", ExactSpelling=true, SetLastError=true)]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("user32.dll", ExactSpelling=true)]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
public static extern Bool DeleteDC(IntPtr hdc);
[DllImport("gdi32.dll", ExactSpelling=true)]
public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
[DllImport("gdi32.dll", ExactSpelling=true, SetLastError=true)]
public static extern Bool DeleteObject(IntPtr hObject);
}
/// <para>Your PerPixel form should inherit this class</para>
/// <author><name>Rui Godinho Lopes</name><email>[email protected]</email></author>
public class PerPixelAlphaForm : Form
{
public PerPixelAlphaForm()
{
// This form should not have a border or else Windows will clip it.
FormBorderStyle = FormBorderStyle.None;
}
/// <para>Changes the current bitmap.</para>
public void SetBitmap(Bitmap bitmap)
{
SetBitmap(bitmap, 255);
}
/// <para>Changes the current bitmap with a custom opacity level. Here is where all happens!</para>
public void SetBitmap(Bitmap bitmap, byte opacity)
{
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
// The ideia of this is very simple,
// 1. Create a compatible DC with screen;
// 2. Select the bitmap with 32bpp with alpha-channel in the compatible DC;
// 3. Call the UpdateLayeredWindow.
IntPtr screenDc = Win32.GetDC(IntPtr.Zero);
IntPtr memDc = Win32.CreateCompatibleDC(screenDc);
IntPtr hBitmap = IntPtr.Zero;
IntPtr oldBitmap = IntPtr.Zero;
try {
hBitmap = bitmap.GetHbitmap(Color.FromArgb(0)); // grab a GDI handle from this GDI+ bitmap
oldBitmap = Win32.SelectObject(memDc, hBitmap);
Win32.Size size = new Win32.Size(bitmap.Width, bitmap.Height);
Win32.Point pointSource = new Win32.Point(0, 0);
Win32.Point topPos = new Win32.Point(Left, Top);
Win32.BLENDFUNCTION blend = new Win32.BLENDFUNCTION();
blend.BlendOp = Win32.AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = opacity;
blend.AlphaFormat = Win32.AC_SRC_ALPHA;
Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, Win32.ULW_ALPHA);
}
finally {
Win32.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero) {
Win32.SelectObject(memDc, oldBitmap);
//Windows.DeleteObject(hBitmap); // The documentation says that we have to use the Windows.DeleteObject... but since there is no such method I use the normal DeleteObject from Win32 GDI and it's working fine without any resource leak.
Win32.DeleteObject(hBitmap);
}
Win32.DeleteDC(memDc);
}
}
protected override CreateParams CreateParams
{
get {
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00080000; // This form has to have the WS_EX_LAYERED extended style
return cp;
}
}
}
然后我像这样更改了初始屏幕代码
namespace MoballeghanPro.Client
{
public partial class frmSplashScreen : PerPixelAlphaForm
{
public frmSplashScreen()
{
InitializeComponent();
}
private void frmSplashScreen_Load(object sender, EventArgs e)
{
SetBitmap(Properties.Resources.IntroMobaleghan); //Png picture in the resources
}
}
}
现在，表格可以根据需要显示为完美
这是我使用的代码的许可证：
// Copyright © 2002-2004 Rui Godinho Lopes <[email protected]>
// All rights reserved.
//
// This source file(s) may be redistributed unmodified by any means
// PROVIDING they are not sold for profit without the authors expressed
// written consent, and providing that this notice and the authors name
// and all copyright notices remain intact.
//
// Any use of the software in source or binary forms, with or without
// modification, must include, in the user documentation ("About" box and
// printed documentation) and internal comments to the code, notices to
// the end user as follows:
//
// "Portions Copyright © 2002-2004 Rui Godinho Lopes"
//
// An email letting me know that you are using it would be nice as well.
// That's not much to ask considering the amount of work that went into
// this.
//
// THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED. USE IT AT YOUT OWN RISK. THE AUTHOR ACCEPTS NO
// LIABILITY FOR ANY DATA DAMAGE/LOSS THAT THIS PRODUCT MAY CAUSE.
关于c# - 创建透明的启动画面，没有任何噪音，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/37453743/