CODEWITHSUNDEEP
c#winapiuser-interfaceconsolefocus
Bitterblue
Bitterblue

Reputation: 14075

How To Give Back Focus From Console Window in C#?

I have a C# console application (A) that opens with the black windows console. Sometimes at startup it steals the focus from another program (B) that needs the focus.

Question: How can I give focus back from A.exe to B.exe ?

A -> Focus -> B

Details:

Upvotes: 7

Views: 3664

Answers (2)

Gabe Halsmer
Gabe Halsmer

Reputation: 868

To do this for your current running C# Console app...

[DllImport("user32.dll")]
public static extern bool ShowWindowAsync(HandleRef hWnd, int nCmdShow);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
static extern IntPtr FindWindowByCaption(IntPtr zeroOnly, string lpWindowName);
public const int SW_RESTORE = 9;
static void FocusMe()
{
    string originalTitle = Console.Title;
    string uniqueTitle = Guid.NewGuid().ToString();
    Console.Title = uniqueTitle;
    Thread.Sleep(50);
    IntPtr handle = FindWindowByCaption(IntPtr.Zero, uniqueTitle);

    Console.Title = originalTitle;

    ShowWindowAsync(new HandleRef(null, handle), SW_RESTORE);
    SetForegroundWindow(handle);
}

Upvotes: 3

phcoding
phcoding

Reputation: 608

// this should do the trick....

[DllImport("user32.dll")]
public static extern bool ShowWindowAsync(HandleRef hWnd, int nCmdShow);
[DllImport("user32.dll")]
public static extern bool SetForegroundWindow(IntPtr WindowHandle);

public const int SW_RESTORE = 9;

private void FocusProcess(string procName)
{
    Process[] objProcesses = System.Diagnostics.Process.GetProcessesByName(procName);
    if (objProcesses.Length > 0)
    {
        IntPtr hWnd = IntPtr.Zero;
        hWnd = objProcesses[0].MainWindowHandle;
        ShowWindowAsync(new HandleRef(null,hWnd), SW_RESTORE);
        SetForegroundWindow(objProcesses[0].MainWindowHandle);
    }
}

Upvotes: 7

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