C#桌面程序中调用Windows的API实现窗体动画

　　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：

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        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;
            }
        }