How to disable Cancel button in the installer dialog

Question

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

I want to disable this cancel button from code side.

Answer 1

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: