[英]how to set focus and launch the already running application on button click event in c#.net3.5?
[英]How can i set the focus to application which is already in running state?
我開發了一個C#Windows應用程序並創建了它的exe。
我想要的是,當我嘗試運行應用程序時,如果它已經處於運行狀態,則激活該應用程序實例,否則啟動新應用程序。
這意味着我不想多次打開同一個應用程序
使用以下代碼將焦點設置為當前應用程序:
[DllImport("user32.dll")]
internal static extern IntPtr SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")]
internal static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
...
Process currentProcess = Process.GetCurrentProcess();
IntPtr hWnd = currentProcess.MainWindowHandle;
if (hWnd != IntPtr.Zero)
{
SetForegroundWindow(hWnd);
ShowWindow(hWnd, User32.SW_MAXIMIZE);
}
您可以從user32.dll PInvoke SetForegroundWindow()和SetFocus()來執行此操作。
[DllImport("user32.dll")]
static extern bool SetForegroundWindow(IntPtr hWnd);
// SetFocus will just focus the keyboard on your application, but not bring your process to front.
// You don't need it here, SetForegroundWindow does the same.
// Just for documentation.
[DllImport("user32.dll")]
static extern IntPtr SetFocus(HandleRef hWnd);
作為參數,您傳遞要引入前端和焦點的過程的窗口句柄。
SetForegroundWindow(myProcess.MainWindowHandle);
SetFocus(new HandleRef(null, myProcess.Handle)); // not needed
使用Mutex啟動應用程序的單個實例。 此外,您可以使用Process類在其上查找您的應用程序和SetFocus。 這里http://social.msdn.microsoft.com/Forums/da-DK/csharpgeneral/thread/7fd8e358-9709-47f2-9aeb-6c35c7521dc3
使用以下代碼部分進行exe的多個實例檢查,以及它在表單加載時的真實返回。 要在您的應用中運行此功能,請using System.Diagnostics;
命名空間
private bool CheckMultipleInstanceofApp()
{
bool check = false;
Process[] prc = null;
string ModName, ProcName;
ModName = Process.GetCurrentProcess().MainModule.ModuleName;
ProcName = System.IO.Path.GetFileNameWithoutExtension(ModName);
prc = Process.GetProcessesByName(ProcName);
if (prc.Length > 1)
{
MessageBox.Show("There is an Instance of this Application running");
check = true;
System.Environment.Exit(0);
}
return check;
}
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