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c#installationcustom-action

How to disable Cancel button in the installer dialog

Sometimes i want disable a cancel button when installing my package, I am using visual studio installer. enter image description here

I want to disable this cancel button from code side.

Solution

  • Here is a solution with the WIN32 API:

    • Get the class name of the Window with Spy++ and search it with the function FindWindow
    • Get the Button hwnd by FindWindowEx
    • Disable it by EnableWindow

    Here is my example code:

    Win32 Function declaration: 

    [DllImport("user32.dll")]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className, string windowTitle);

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool EnableWindow(IntPtr hWnd, bool bEnable);

    Code to disable the button: 

    IntPtr hwndWindow = FindWindow("MsiDialogCloseClass", "Installer");
IntPtr hwndButton = FindWindowEx((IntPtr)hwndWindow, IntPtr.Zero, "Button", "Cancel");

if (EnableWindow(hwndButton, false))
{
    //has been disabled
}

    Here my test window:

    enter image description here