Windows是一個強大的操作系統，也會向開發者提供海量的系統API來幫助開發者來完成Windows系統軟件的開發工作。
整理的部分Windows API，C#可以直接調用。
1.獲取.exe應用程序的圖標
1 [DllImport("shell32.DLL", EntryPoint = "ExtractAssociatedIcon")]
2 private static extern int ExtractAssociatedIconA(int hInst, string lpIconPath, ref int lpiIcon); //聲明函數
3 System.IntPtr thisHandle;
4 public System.Drawing.Icon GetIco(string filePath)//filePath是要獲取文件路徑，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.獲取硬盤信息
public string GetComputorInformation()
{
StringBuilder mStringBuilder = new StringBuilder();
DriveInfo[] myAllDrivers = DriveInfo.GetDrives();
try
{
foreach (DriveInfo myDrive in myAllDrivers)
{
if (myDrive.IsReady)
{
mStringBuilder.Append("磁盤驅動器盤符：");
mStringBuilder.AppendLine(myDrive.Name);
mStringBuilder.Append("磁盤卷標：");
mStringBuilder.AppendLine(myDrive.VolumeLabel);
mStringBuilder.Append("磁盤類型：");
mStringBuilder.AppendLine(myDrive.DriveType.ToString());
mStringBuilder.Append("磁盤格式：");
mStringBuilder.AppendLine(myDrive.DriveFormat);
mStringBuilder.Append("磁盤大小：");
decimal resultmyDrive = Math.Round((decimal)myDrive.TotalSize / 1024 / 1024 / 1024, 2);
mStringBuilder.AppendLine(resultmyDrive "GB");
mStringBuilder.Append("剩余空間：");
decimal resultAvailableFreeSpace = Math.Round((decimal)myDrive.AvailableFreeSpace / 1024 / 1024 / 1024, 2);
mStringBuilder.AppendLine(resultAvailableFreeSpace "GB");
mStringBuilder.Append("總剩余空間（含磁盤配額）：");
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.開機啟動程序
//獲取注冊表中的啟動位置
RegistryKey RKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true);
///<summary>/// 設置開機啟動
///</summary>///<param name="path"/>public void StartRunApp(string path)
{
string strnewName = path.Substring(path.LastIndexOf("\\") 1);//要寫入注冊表的鍵值名稱
if (!File.Exists(path))//判斷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);//通過修改注冊表，使程序在開機時自動運行
}
///<summary>/// 取消開機啟動
///</summary>///<param name="path"/>public void ForbitStartRun(string path)
{
string strnewName = path.Substring(path.LastIndexOf("\\") 1);//要寫入注冊表的鍵值名稱
RKey.DeleteValue(strnewName, false);//通過修改注冊表，取消程序在開機時自動運行
}
4.系統熱鍵操作
[DllImport("user32.dll")] //聲明api函數
public static extern bool RegisterHotKey(
IntPtr hwnd, // 窗口句柄
int id, // 熱鍵ID
uint fsmodifiers, // 熱鍵修改選項
Keys vk // 熱鍵
);
[DllImport("user32.dll")] //聲明api函數
public static extern bool UnregisterHotKey(
IntPtr hwnd, // 窗口句柄
int id // 熱鍵ID
);
public enum keymodifiers //組合鍵枚舉
{
none = 0,
alt = 1,
control = 2,
shift = 4,
windows = 8
}
private void processhotkey(Message m) //按下設定的鍵時調用該函數
{
IntPtr id = m.WParam; //intptr用於表示指針或句柄的平台特定類型
//messagebox.show(id.tostring());
string sid = id.ToString();
switch (sid)
{
case "100":
break;
case "200":
break;
}
}
///<summary>/// 注冊熱鍵
///</summary>public void RegisterHotkey(IntPtr handle, int hotkeyID, uint fsmodifiers, Keys mKeys)
{
RegisterHotKey(handle, hotkeyID, fsmodifiers, mKeys);
}
///<summary>/// 卸載熱鍵
///</summary>///<param name="handle"/>///<param name="hotkeyID"/>public void UnregisterHotkey(IntPtr handle, int hotkeyID)
{
UnregisterHotKey(handle, hotkeyID);
}
5.系統進程操作
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);
//定義CPU的信息結構
[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;
}
//定義內存的信息結構
[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;
}
//定義系統時間的信息結構
[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>/// 獲取當前所有進程
///</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);
//有些進程無法獲取啟動時間和文件名信息，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>/// 結束進程
///</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.改變窗口
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);
