wpf-单实例运行

发表于 2020-07-18 更新于 2020-07-20 分类于 Language 阅读次数：本文字数： 893 阅读时长 ≈ 1 分钟

Mutex mutex = null;

[DllImport("user32.dll", EntryPoint = "FindWindow")]
private static extern IntPtr FindWindow(string sClass, string sWindow);

[DllImport("user32.dll")]
public static extern bool SetForegroundWindow(IntPtr hWnd);

[DllImport("user32.dll")]
public static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);

[DllImport("user32.dll", SetLastError = true)]
static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

const int SW_HIDE = 0;
const int SW_SHOWNORMAL = 1;
const int SW_RESTORE = 9;
const int SW_SHOW = 5;

private void Application_Startup(object sender, StartupEventArgs e)
{
    bool createdNew = false;
    mutex = new Mutex(true, "SPCAssist", out createdNew);
    if (!createdNew)
    {
        IntPtr hWndPtr = FindWindow(null, "SPCAssist");
        //移动到最前
        SwitchToThisWindow(hWndPtr, true);
        //s2;显示窗体
        ShowWindow(hWndPtr, SW_SHOW| SW_RESTORE);
        //s3: 置顶
        SetForegroundWindow(hWndPtr);
        Shutdown();
    }
    ...
}