9个常用的WindowsAPI
1.API根据窗体句柄修改位置和大小
[System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "MoveWindow")]
public static extern bool MoveWindow(int hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
[DllImport("user32.dll", EntryPoint = "FindWindow")]
public static extern int FindWindow(
string lpClassName,
string lpWindowName
);
MoveWindow(FindWindow(null, "VLC media player"), groupBox2.Location.X, groupBox2.Location.Y, groupBox2.Width, groupBox2.Height, true);
2.API根据窗体句柄修改指定窗体的title（标题）
[DllImport("user32.dll", EntryPoint = "FindWindowA", CharSet = CharSet.Ansi)]
public static extern int FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", EntryPoint = "SetWindowText", CharSet = CharSet.Ansi)]
public static extern int SetWindowText(int hwnd, string lpString);
static void Main(string[] args)
{
int lHwnd = FindWindow(null, "无标题 - 记事本");
while (lHwnd != 0)
{
SetWindowText(lHwnd, "有标题");
lHwnd = FindWindow(null, "无标题 - 记事本");
}
}
3.C#使用API禁用/删除程序窗体的关闭菜单和按钮
[DllImport("user32.dll")]
static extern IntPtr GetSystemMenu(IntPtr hwnd, bool bRevert);
[DllImport("user32.dll")]
static extern bool DeleteMenu(IntPtr hMenu, uint uPosition, uint uFlags);
[DllImport("user32.dll")]
static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);
const uint SC_MOVE = 0xF010; //移动
const uint SC_CLOSE = 0xF060;//关闭
const uint MF_BYCOMMAND = 0x00; //按命令方式
const uint MF_GRAYED = 0x01; //灰掉
const uint MF_DISABLED = 0x02; //不可用
private void Form1_Load(object sender, EventArgs e)
{
IntPtr hMenu = GetSystemMenu(this.Handle, false); //获取程序窗体的句柄
if (hMenu != IntPtr.Zero)
{
DeleteMenu(hMenu, SC_MOVE, MF_BYCOMMAND); //删除移动菜单，禁用移动功能
EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | MF_GRAYED | MF_DISABLED); //禁用关闭功能
}
}
RemoveMenu(GetSystemMenu(FindWindow("QWidget", null), 0), SC_MINIMIZE, SC_MINIMIZE);
4.C#使用API制作窗体开启关闭特效动画
private const Int32 AW_HOR_POSITIVE = 0x00000001; //从左到右显示
private const Int32 AW_HOR_NEGATIVE = 0x00000002; //从右到左显示
private const Int32 AW_VER_POSITIVE = 0x00000004; //从上到下显示
private const Int32 AW_VER_NEGATIVE = 0x00000008; //从下到上显示
private const Int32 AW_CENTER = 0x00000010;
//若使用了AW_HIDE标志，则使窗口向内重叠，即收缩窗口；否则使窗口向外扩展，即展开窗口
private const Int32 AW_HIDE = 0x00010000;
//隐藏窗口，缺省则显示窗口
private const Int32 AW_ACTIVATE = 0x00020000;
//激活窗口。在使用了AW_HIDE标志后不能使用这个标志
private const Int32 AW_SLIDE = 0x00040000;
//使用滑动类型。缺省则为滚动动画类型。当使用AW_CENTER标志时，这个标志就被忽略
private const Int32 AW_BLEND = 0x00080000; //渐变
[DllImport("user32")]//using System.Runtime.InteropServices;
private static extern bool AnimateWindow(IntPtr whnd, int dwtime, int dwflag);
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{//实现的效果是：从标题栏处下拉出整个窗体
AnimateWindow(this.Handle, 100, AW_SLIDE | AW_VER_POSITIVE );
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{//实现的效果是：整个窗体从下上推至标题栏
AnimateWindow(this.Handle, 100, AW_HIDE | AW_SLIDE | AW_VER_NEGATIVE);//因为是关闭窗体，所以参数要写AW_HIDE
}
5.鼠标穿透效果
private const uint WS_EX_LAYERED = 0x80000;
private const int WS_EX_TRANSPARENT = 0x20;
private const int GWL_STYLE = (-16);
private const int GWL_EXSTYLE = (-20);
private const int LWA_ALPHA = 0;
[DllImport("user32", EntryPoint = "SetWindowLong")]
private static extern uint SetWindowLong(
IntPtr hwnd,
int nIndex,
uint dwNewLong
);
[DllImport("user32", EntryPoint = "GetWindowLong")]
private static extern uint GetWindowLong(
IntPtr hwnd,
int nIndex
);
[DllImport("user32", EntryPoint = "SetLayeredWindowAttributes")]
private static extern int SetLayeredWindowAttributes(
IntPtr hwnd,
int crKey,
int bAlpha,
int dwFlags
);
/// <summary>
/// 设置窗体具有鼠标穿透效果
/// </summary>
public void SetPenetrate()
{
this.TopMost = true;
GetWindowLong(this.Handle, GWL_EXSTYLE);
SetWindowLong(this.Handle, GWL_EXSTYLE, WS_EX_TRANSPARENT | WS_EX_LAYERED);
SetLayeredWindowAttributes(this.Handle, 0, 100, LWA_ALPHA);
}
6.控制鼠标的位置
[DllImport("User32.dll")]
private static extern bool SetCursorPos(int x, int y);
private void Form1_Load(object sender, EventArgs e)
{
SetPos();
}
private static void SetPos()
{
int dx = 0;
int dy = 0;
SetCursorPos(dx, dy);
}
7.拖动移动无标题窗体
[DllImportAttribute("user32.dll")]
private extern static bool ReleaseCapture();
[DllImportAttribute("user32.dll")]
private extern static int SendMessage(IntPtr handle, int m, int p, int h);
protected void MyBaseControl_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.Cursor = Cursors.SizeAll;
ReleaseCapture();
SendMessage(this.Handle, 0xA1, 0x2, 0);
this.Cursor = Cursors.Default;
}
}
/*注：如果用于运行时的某个控件，
* 则可以把上面的代码放入此控件的MouseDown事件中，
* 只是SendMessage(this.Handle, 0xA1, 0x2, 0);
* 中的this.Handle参数应改为此控件的Handle，
* 如this.button1.Handle即可实现。
*/
8.窗体窗口置顶,在其他窗体上面
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern System.IntPtr GetForegroundWindow();
private void Form1_Load(object sender, EventArgs e)
{
SetWindowPos(this.Handle, -1, 0, 0, 0, 0, 1 | 2);
}
9定义系统热键,自定义快捷键
//注册热键的api
[DllImport("user32")]
public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint control,Keys vk);
[DllImport("user32")]
public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
private void Form1_Load(object sender, EventArgs e)
{
RegisterHotKey(this.Handle, 888,2, Keys.A);
//注册热键：handle:这个窗体的handle 888:这个热键的标志id 2:crtl键 A: a键
//UnregisterHotKey(this.Handle, 888);
//卸载热键：handle:这个窗体的handle 888:上面那个热键的标志id
}
//监听Windows事件
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 0x0312: //这个是window消息定义的 注册的热键消息
if (m.WParam.ToString().Equals("888")) //如果是我们注册的那个热键
MessageBox.Show("你按了ctrl+a");
break;
}
base.WndProc(ref m);
}
//None = 0,
//Alt = 1,
//crtl= 2,
//Shift = 4,
//Windows = 8
//这是热键的定义 alt+crtl是3 直接相加就可以了