C#调用Windows的API实现窗体动画
dawn 人气:0在VF、VB、PB的应用中，有些无法通过语言工具本身来完成的或者做得不理想的功能，我们会考虑通过Windows的API来完成。
在那个年代，熟悉API是一个编程者的基本功。那个时候网络信息也不发达，很多资料只能考购买书籍或者自己摸索来获取，每次掌握一个新的API应用内心里都有点小激动。
Powerbuilder数据功能强大，但是界面功能尤其是动画功能比较弱，通过调用Windows的API实现窗体动画比较容易。
声明API调用：
function boolean AnimateWindow ( long hwnd, long dwtime, long dwflags ) library "user32"
声明常量：
constant long AW_HOR_POSITIVE = 1 constant long AW_HOR_NEGATIVE = 2 constant long AW_VER_POSITIVE = 4 constant long AW_VER_NEGATIVE = 8 constant long AW_CENTER = 16 constant long AW_HIDE = 65526 constant long AW_ACTIVATE = 131072 conDAT* ? ?stant long AW_SLIDE = 262144 constant long AW_BLEND = 524288
在窗体的open事件中调用：
long ll_handle
ll_handle = Handle ( This )
Randomize ( 0 )
Choose Case rand ( 6 )
Case 1
AnimateWindow ( ll_handle, 1000, AW_SLIDE + AW_VER_POSITIVE + AW_ACTIVATE )
Case 2
AnimateWindow ( ll_handle, 1000, AW_SLIDE + AW_VER_NEGATIVE+ AW_ACTIVATE )
Case 3
AnimateWindow ( ll_handle, 1000, AW_SLIDE + AW_HOR_POSITIVE + AW_ACTIVATE )
Case 4
AnimateWindow ( ll_handle, 1000, AW_SLIDE + AW_HOR_NEGATIVE + AW_ACTIVATE )
Case 6,5
AnimateWindow ( ll_handle, 1000, AW_SLIDE + AW_CENTER + AW_ACTIVATE )
End Choose
在C#中调用Windows的API来实现动画也一样容易。
引用：
using System.Runtime.InteropServices;
定义常量：
public const Int32 AW_HOR_POSITIVE = 0x00000001;
public const Int32 AW_HOR_NEGATIVE = 0x00000002;
public const Int32 AW_VER_POSITIVE = 0x00000004;
public const Int32 AW_VER_NEGATIVE = 0x00000008;
public const Int32 AW_CENTER = 0x00000010;
public const Int32 AW_HIDE = 0x00010000;
public const Int32 AW_ACTIVATE = 0x00020000;
public const Int32 AW_SLIDE = 0x00040000;
public const Int32 AW_BLEND = 0x00080000;
定义调用：
[DllImportAttribute("user32.dll")]
private static extern bool AnimateWindow(IntPtr hwnd,int dwTime,int dwFlags);
调用：
private void Form1_Load(object sender, EventArgs e)
{
//this.FormBorderStyle =0 ;
Random rand = new Random();
long LL = rand.Next(1,6);
label1.Text = "动画演示："+LL.ToString();
switch (LL)
{
case 1:
AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_VER_POSITIVE + AW_ACTIVATE);
break;
case 2:
AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_VER_NEGATIVE + AW_ACTIVATE);
break;
case 3:
AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_HOR_POSITIVE + AW_ACTIVATE);
break;
case 4:
AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_HOR_NEGATIVE + AW_ACTIVATE);
break;
case 5:
AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_CENTER + AW_ACTIVATE);
break;
case 6:
AnimateWindow(this.Handle, 1000, AW_SLIDE + AW_CENTER + AW_ACTIVATE);
break;
}
}效果图
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