C#是针对WIndows而生的，开发WIndows应用最快。然而想要让自己程序进阶，就不需深入Windows底层，WinAPI为我们提供了一把利刃。
目录
1、查找窗口句柄
2、查找窗口内子对象
3、指定窗口样式
4、指定窗口扩展样式
5、调整窗口大小Z轴（层叠）
6、获得窗口样式
7、向窗口发送命令
8、指定父窗口
9、获取窗口进程
10、移动及缩放窗口
11、隐藏任务栏
12、隐藏任务栏按钮
13、WinAPI调用的类含常数定义
1、查找窗口句柄
[DllImport("user32.dll", EntryPoint = "FindWindow")]
private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);
lpClassName类名，用Spy++工具可以获得
lpWindowName窗口标题，任务栏、任务管理器都可以看到
以上两个参数，可以只写一个，另一个写null
2、查找窗口内子对象
[DllImport("user32.dll", EntryPoint = "FindWindow")]
private static extern IntPtr FindWindowEx( IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow )
如：
ShowWindow((int)FindWindowEx(FindWindow("Shell_TrayWnd", null), IntPtr.Zero, "Start", null), SW_RESTORE); //隐藏开始按钮3、指定窗口样式
[DllImport("user32.dll")]
SetWindowLong(PPThwnd, GWL_STYLE, s | WS_CHILD);4、指定窗口扩展样式
SetWindowLong(IntPtr hWnd, GWL_EXSTYLE, WS_EX_TOOLWINDOW);5、调整窗口大小Z轴（层叠）
[DllImport("User32.dll", CharSet = CharSet.Auto)]
private static extern bool SetWindowPos(IntPtr hWnd, int hWndlnsertAfter, int X, int Y, int cx, int cy, uint Flags);6、获得窗口样式
[DllImport("user32.dll", EntryPoint = "GetWindowLong")]
public static extern int GetWindowLong(IntPtr hwnd, int nIndex);7、向窗口发送命令
[DllImport("user32.dll", EntryPoint = "SendMessageA")]
public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);8、指定父窗口
[DllImport("user32.dll")]
private static extern IntPtr SetParent(IntPtr childIntPtr, IntPtr parentIntPtr);9、获取窗口进程
[DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);//获取进程ID10、移动及缩放窗口
[DllImport("user32.dll", SetLastError = true)]
public static extern bool MoveWindow(IntPtr hwnd, int x, int y, int cx, int cy, bool repaint);*窗体被嵌入其它程序后，如果需哟调整位置及大小，就用这个！
11、隐藏任务栏
IntPtr trayHwnd = FindWindow("Shell_TrayWnd", null);
ShowWindow(trayHwnd, 0);“0”改为“1”，为显示任务栏
12、隐藏任务栏按钮
SetWindowLong((IntPtr)pvm , GWL_EXSTYLE, WS_EX_TOOLWINDOW); //设置窗口扩展样式为WS_EX_TOOLWINDOW，可以让窗体不在任务栏中显示。13、WinAPI调用的类含常数定义
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Runtime.InteropServices;
namespace APIHelper
{
/// <summary>
/// Windows API 函数声明
/// </summary>
public class Win32API
{
#region .ctor()
// No need to construct this object
private Win32API()
{
}
#endregion
#region Constans values
public const string TOOLBARCLASSNAME = "ToolbarWindow32";
public const string REBARCLASSNAME = "ReBarWindow32";
public const string PROGRESSBARCLASSNAME = "msctls_progress32";
public const string SCROLLBAR = "SCROLLBAR";
#endregion
#region CallBacks
public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
#endregion
#region Kernel32.dll functions
[DllImport("kernel32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
public static extern int GetCurrentThreadId();
#endregion
#region Gdi32.dll functions
[DllImport("gdi32.dll")]
static public extern bool StretchBlt(IntPtr hDCDest, int XOriginDest, int YOriginDest, int WidthDest, int HeightDest,
IntPtr hDCSrc, int XOriginScr, int YOriginSrc, int WidthScr, int HeightScr, uint Rop);
[DllImport("gdi32.dll")]
static public extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("gdi32.dll")]
static public extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int Width, int Heigth);
[DllImport("gdi32.dll")]
static public extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
[DllImport("gdi32.dll")]
static public extern bool BitBlt(IntPtr hDCDest, int XOriginDest, int YOriginDest, int WidthDest, int HeightDest,
IntPtr hDCSrc, int XOriginScr, int YOriginSrc, uint Rop);
[DllImport("gdi32.dll")]
static public extern IntPtr DeleteDC(IntPtr hDC);
[DllImport("gdi32.dll")]
static public extern bool PatBlt(IntPtr hDC, int XLeft, int YLeft, int Width, int Height, uint Rop);
[DllImport("gdi32.dll")]
static public extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
static public extern uint GetPixel(IntPtr hDC, int XPos, int YPos);
[DllImport("gdi32.dll")]
static public extern int SetMapMode(IntPtr hDC, int fnMapMode);
[DllImport("gdi32.dll")]
static public extern int GetObjectType(IntPtr handle);
[DllImport("gdi32")]
public static extern IntPtr CreateDIBSection(IntPtr hdc, ref BITMAPINFO_FLAT bmi,
int iUsage, ref int ppvBits, IntPtr hSection, int dwOffset);
[DllImport("gdi32")]
public static extern int GetDIBits(IntPtr hDC, IntPtr hbm, int StartScan, int ScanLines, int lpBits, BITMAPINFOHEADER bmi, int usage);
[DllImport("gdi32")]
public static extern int GetDIBits(IntPtr hdc, IntPtr hbm, int StartScan, int ScanLines, int lpBits, ref BITMAPINFO_FLAT bmi, int usage);
[DllImport("gdi32")]
public static extern IntPtr GetPaletteEntries(IntPtr hpal, int iStartIndex, int nEntries, byte[] lppe);
[DllImport("gdi32")]
public static extern IntPtr GetSystemPaletteEntries(IntPtr hdc, int iStartIndex, int nEntries, byte[] lppe);
[DllImport("gdi32")]
public static extern uint SetDCBrushColor(IntPtr hdc, uint crColor);
[DllImport("gdi32")]
public static extern IntPtr CreateSolidBrush(uint crColor);
[DllImport("gdi32")]
public static extern int SetBkMode(IntPtr hDC, BackgroundMode mode);
[DllImport("gdi32")]
public static extern int SetViewportOrgEx(IntPtr hdc, int x, int y, int param);
[DllImport("gdi32")]
public static extern uint SetTextColor(IntPtr hDC, uint colorRef);
[DllImport("gdi32")]
public static extern int SetStretchBltMode(IntPtr hDC, int StrechMode);
#endregion
#region Uxtheme.dll functions
[DllImport("uxtheme.dll")]
static public extern int SetWindowTheme(IntPtr hWnd, string AppID, string ClassID);
#endregion
#region User32.dll functions
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr GetDC(IntPtr hWnd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern IntPtr GetDesktopWindow();
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool ShowWindow(IntPtr hWnd, short State);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool UpdateWindow(IntPtr hWnd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int Width, int Height, uint flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool OpenClipboard(IntPtr hWndNewOwner);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool CloseClipboard();
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool EmptyClipboard();
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern IntPtr SetClipboardData(uint Format, IntPtr hData);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
static public extern bool GetMenuItemRect(IntPtr hWnd, IntPtr hMenu, uint Item, ref RECT rc);
[DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
public static extern IntPtr GetParent(IntPtr hWnd);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref RECT lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref POINT lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref TBBUTTON lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref TBBUTTONINFO lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref REBARBANDINFO lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern void SendMessage(IntPtr hWnd, int msg, int
