Which .NET namespace contains WIN32 API message constants such as WM_COMMAND?

Other Questions API
1

I’m implementing the WndProc method and would like to utilize the following code structure:

if (message.Type == COMMAND_MESSAGE)
    ExecuteSpecialLogic();
else
    base.ProcessWnd(ref message);

Can anyone guide me on where to find these constants in .NET?

2

In the .NET Framework, WIN32 API message constants such as WM_COMMAND are not actually included within any specific namespace directly by default. These constants are generally part of the Windows API and can be accessed using PInvoke within your C# application.

To utilize these constants in your C# code, you can define them yourself. Here’s an example of how you can define the WM_COMMAND constant:

private const int WM_COMMAND = 0x0111;

protected override void WndProc(ref Message message)
{
    if (message.Msg == WM_COMMAND)
    {
        ExecuteSpecialLogic();
    }
    else
    {
        base.WndProc(ref message);
    }
}

By declaring the constant at the start of your class or within the scope where it’s needed, you can then apply these message constants effectively in your WndProc method. For further expansions, you might consider creating a static class to house these constants if they are used across multiple classes within your project.

3

To reference WIN32 API message constants like WM_COMMAND in .NET, define them manually in your code. They aren’t natively included in a specific .NET namespace:

private const int WM_COMMAND = 0x0111;

protected override void WndProc(ref Message message) {
    if (message.Msg == WM_COMMAND) {
        ExecuteSpecialLogic();
    } else {
        base.WndProc(ref message);
    }
}

You could also create a static class for reusable constants across your project.