C# WindowsAPI

**Windows是一个强大的操作系统，也会向开发者提供海量的系统API来帮助开发者来完成Windows系统软件的开发工作。

整理的部分Windows API，C#可以直接调用**

1.获取.exe应用程序的图标

[DllImport("shell32.DLL", EntryPoint = "ExtractAssociatedIcon")] private static extern int ExtractAssociatedIconA(int hInst, string lpIconPath, ref int lpiIcon); //声明函数 System.IntPtr thisHandle; public System.Drawing.Icon GetIco(string filePath)//filePath是要获取文件路径，返回ico格式文件 { int RefInt = 0; thisHandle = new IntPtr(ExtractAssociatedIconA(0, filePath, ref RefInt)); return System.Drawing.Icon.FromHandle(thisHandle); }

2.获取硬盘信息

public string GetComputorInformation() { StringBuilder mStringBuilder = new StringBuilder(); DriveInfo[] myAllDrivers = DriveInfo.GetDrives(); try { foreach (DriveInfo myDrive in myAllDrivers) { if (myDrive.IsReady) { mStringBuilder.Append("磁盘驱动器盘符："); mStringBuilder.AppendLine(myDrive.Name); mStringBuilder.Append("磁盘卷标："); mStringBuilder.AppendLine(myDrive.VolumeLabel); mStringBuilder.Append("磁盘类型："); mStringBuilder.AppendLine(myDrive.DriveType.ToString()); mStringBuilder.Append("磁盘格式："); mStringBuilder.AppendLine(myDrive.DriveFormat); mStringBuilder.Append("磁盘大小："); decimal resultmyDrive = Math.Round((decimal)myDrive.TotalSize / 1024 / 1024 / 1024, 2); mStringBuilder.AppendLine(resultmyDrive "GB"); mStringBuilder.Append("剩余空间："); decimal resultAvailableFreeSpace = Math.Round((decimal)myDrive.AvailableFreeSpace / 1024 / 1024 / 1024, 2); mStringBuilder.AppendLine(resultAvailableFreeSpace "GB"); mStringBuilder.Append("总剩余空间（含磁盘配额）："); decimal resultTotalFreeSpace = Math.Round((decimal)myDrive.TotalFreeSpace / 1024 / 1024 / 1024, 2); mStringBuilder.AppendLine(resultTotalFreeSpace "GB"); mStringBuilder.AppendLine("---------------------------"); } } } catch (Exception ex) { throw ex; } return mStringBuilder.ToString(); }

3.开机启动程序

//获取注册表中的启动位置 RegistryKey RKey = Registry.LocalMachine.OpenSubKey ("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true); ///<summary>/// 设置开机启动 ///</summary>///<param name="path"/>public void StartRunApp(string path) { string strnewName = path.Substring(path.LastIndexOf("\\") 1);//要写入注册表的 键值名称 if (!File.Exists(path))//判断指定的文件是否存在 return; if (RKey == null) { RKey = Registry.LocalMachine.CreateSubKey ("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run"); } RKey.SetValue(strnewName, path);//通过修改注册表，使程序在开机时自动运行 } ///<summary>/// 取消开机启动 ///</summary>///<param name="path"/>public void ForbitStartRun(string path) { string strnewName = path.Substring(path.LastIndexOf("\\") 1);//要写入注册表的 键值名称 RKey.DeleteValue(strnewName, false);//通过修改注册表，取消程序在开机时自动运行 }

4.系统热键操作

[DllImport("user32.dll")] //声明api函数 public static extern bool RegisterHotKey( IntPtr hwnd, // 窗口句柄 int id, // 热键ID uint fsmodifiers, // 热键修改选项 Keys vk // 热键 ); [DllImport("user32.dll")] //声明api函数 public static extern bool UnregisterHotKey( IntPtr hwnd, // 窗口句柄 int id // 热键ID ); public enum keymodifiers //组合键枚举 { none = 0, alt = 1, control = 2, shift = 4, windows = 8 } private void processhotkey(Message m) //按下设定的键时调用该函数 { IntPtr id = m.WParam; //intptr用于表示指针或句柄的平台特定类型 //messagebox.show(id.tostring()); string sid = id.ToString(); switch (sid) { case "100": break; case "200": break; } } ///<summary>/// 注册热键 ///</summary>public void RegisterHotkey(IntPtr handle, int hotkeyID, uint fsmodifiers, Keys mKeys) { RegisterHotKey(handle, hotkeyID, fsmodifiers, mKeys); } ///<summary>/// 卸载热键 ///</summary>///<param name="handle"/>///<param name="hotkeyID"/>public void UnregisterHotkey(IntPtr handle, int hotkeyID) { UnregisterHotKey(handle, hotkeyID); }

5.系统进程操作

public class GetProcess { bool isSuccess = false; [DllImport("kernel32")] public static extern void GetWindowsDirectory(StringBuilder WinDir, int count); [DllImport("kernel32")] public static extern void GetSystemDirectory(StringBuilder SysDir, int count); [DllImport("kernel32")] public static extern void GetSystemInfo(ref CPU_INFO cpuinfo); [DllImport("kernel32")] public static extern void GlobalMemoryStatus(ref MEMORY_INFO meminfo); [DllImport("kernel32")] public static extern void GetSystemTime(ref SYSTEMTIME_INFO stinfo); //定义CPU的信息结构 [StructLayout(LayoutKind.Sequential)] public struct CPU_INFO { public uint dwOemId; public uint dwPageSize; public uint lpMinimumApplicationAddress; public uint lpMaximumApplicationAddress; public uint dwActiveProcessorMask; public uint dwNumberOfProcessors; public uint dwProcessorType; public uint dwAllocationGranularity; public uint dwProcessorLevel; public uint dwProcessorRevision; } //定义内存的信息结构 [StructLayout(LayoutKind.Sequential)] public struct MEMORY_INFO { public uint dwLength; public uint dwMemoryLoad; public uint dwTotalPhys; public uint dwAvailPhys; public uint dwTotalPageFile; public uint dwAvailPageFile; public uint dwTotalVirtual; public uint dwAvailVirtual; } //定义系统时间的信息结构 [StructLayout(LayoutKind.Sequential)] public struct SYSTEMTIME_INFO { public ushort wYear; public ushort wMonth; public ushort wDayOfWeek; public ushort wDay; public ushort wHour; public ushort wMinute; public ushort wSecond; public ushort wMilliseconds; } public string GetSystemInformation() { MEMORY_INFO MemInfo = new MEMORY_INFO(); GlobalMemoryStatus(ref MemInfo); return MemInfo.dwMemoryLoad.ToString(); } public string GetSystemCup() { CPU_INFO CpuInfo = new CPU_INFO(); GetSystemInfo(ref CpuInfo); return CpuInfo.dwProcessorType.ToString(); } ///<summary>/// 获取当前所有进程 ///</summary>///<returns></returns>public DataTable GetAllProcess() { DataTable mDataTable = new DataTable(); mDataTable.Rows.Clear(); mDataTable.Columns.Add("ProcessID"); mDataTable.Columns.Add("ProcessName"); mDataTable.Columns.Add("Memory"); mDataTable.Columns.Add("StartTime"); mDataTable.Columns.Add("FileName"); mDataTable.Columns.Add("ThreadNumber"); Process[] myProcess = Process.GetProcesses(); foreach (Process p in myProcess) { DataRow mDataRow = mDataTable.NewRow(); mDataRow[0] = p.Id; mDataRow[1] = p.ProcessName; mDataRow[2] = string.Format("{0:###,##0.00}KB", p.PrivateMemorySize64 / 1024); //有些进程无法获取启动时间和文件名信息，所以要用try/catch; try { mDataRow[3] = string.Format("{0}", p.StartTime); mDataRow[4] = p.MainModule.FileName; mDataRow[5] = p.Threads.Count; } catch { mDataRow[3] = ""; mDataRow[4] = ""; } mDataTable.Rows.Add(mDataRow); } return mDataTable; } ///<summary>/// 结束进程 ///</summary>///<param name="processName"/>///<returns></returns>public bool KillProcess(string processName) { try { System.Diagnostics.Process[] process = System.Diagnostics.Process.GetProcessesByName(processName); foreach (System.Diagnostics.Process p in process) { p.Kill(); } } catch { isSuccess = false; } return isSuccess; } }

6.改变窗口

public const int SE_SHUTDOWN_PRIVILEGE = 0x13; [DllImport("user32.dll")] public static extern IntPtr FindWindow(string lpClassName, string lpWindowName); [DllImport("user32.dll")] public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent); [DllImport("user32.dll")] public static extern bool SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);