GetClientRect Win API Call from C#


What can I use as "RECT" ( in C# when calling an win API

I tried the Rectangle class, but as you'd expect, it threw an access violation.

Here's the api call I'm trying to use:

Here's the code I tried:

        private static extern bool GetClientRect(IntPtr hWnd, Rectangle lpRect);

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You need to use this struct

public struct RECT
    public int left;
    public int top;
    public int right;
    public int bottom;


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If you want to get the client rectangle of a .NET form or control, you can use the ClientRectangle property of the object.


  Nayer Naguib
Mike TomlinsonMiddle School Assistant TeacherCommented:
Be sure to change your API declaration so that it uses the RECT struct posted by gbzhhu instead of Rectangle.  =)

        private static extern bool GetClientRect(IntPtr hWnd, RECT lpRect);
private static extern bool GetClientRect(IntPtr hWnd, ref RECT rect);
saltedAuthor Commented:
Thanks everyone!

This is all really useful (giving the points on this one is going to be tough :)

I used "out" instead of "ref" - i guess that won't make much difference in this case.

OK, so it turns out this isn't doing what i expected :(

To keep it fair, I'm gonna close this question and start a new one (since you've all answered my question here)

See here for my adapted question:

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