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

1 [DllImport("shell32.DLL", EntryPoint = "ExtractAssociatedIcon")] 2 private static extern int ExtractAssociatedIconA(int hInst, string lpIconPath, ref int lpiIcon); //声明函数 3   System.IntPtr thisHandle; 4  public System.Drawing.Icon GetIco(string filePath)//filePath是要获取文件路径，返回ico格式文件 5   { 6    int RefInt = 0; 7    thisHandle = new IntPtr(ExtractAssociatedIconA(0, filePath, ref RefInt)); 8    return System.Drawing.Icon.FromHandle(thisHandle); 9  }

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);

原标题：C# WindowsAPI

关键词：C#