How can I avoid a window from being resized?

I don't want that the user can change the size of the main window of the application.

WM_GETMINMAXINFO.

Create the window without the WS_THICKFRAME style.

I create the main Window using:

Code:

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hwnd = CreateWindowEx (
          0,                  /* Extended possibilites for variation */
          szClassName,        /* Classname */
          "Windows App",      /* Title Text */
          WS_OVERLAPPEDWINDOW, /* default window */
          CW_USEDEFAULT,      /* Windows decides the position */
          CW_USEDEFAULT,      /* where the window ends up on the screen */
          CW_USEDEFAULT,      /* The programs width */
          CW_USEDEFAULT,      /* and height in pixels */
          HWND_DESKTOP,        /* The window is a child-window to desktop */
          NULL,                /* No menu */
          hThisInstance,      /* Program Instance handler */
          NULL                /* No Window Creation data */
          );

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If I process the WM_GETMINMAXINFO, what do I have to do so that the window can't be resized by the user?

You used WS_OVERLAPPEDWINDOW, that is the problem.
This is what it does

WS_OVERLAPPEDWINDOW: Creates an overlapped window with the WS_OVERLAPPED, WS_CAPTION, WS_SYSMENU, WS_THICKFRAME, WS_MINIMIZEBOX, and WS_MAXIMIZEBOX styles. Same as the WS_TILEDWINDOW style.

I want a normal window except for the fact that the user can't resize it. What WS_ .. do I have to use instead of WS_OVERLAPPEDWINDOW?

//constrains window size to 640x480

case WM_GETMINMAXINFO:
{
LPPOINT lppt;

lppt = (LPPOINT)lParam; // lParam points to array of POINTS

lppt[3].x = 640;
lppt[4].x = 640;
lppt[3].y = 480;
lppt[4].y = 480;

return DefWindowProc(hwnd, msg, wParam, lParam);
}

Quote:

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Originally Posted by dit6a9

I want a normal window except for the fact that the user can't resize it. What WS_ .. do I have to use instead of WS_OVERLAPPEDWINDOW?

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WS_OVERLAPPEDWINDOW&~WS_THICKFRAME to create a window with a non-sizing border while retaining the other styles included with WS_OVERLAPPED. WM_GETMINMAXINFO is used to limit the dimensions of a window that can be resized by the user which is what I originally thought you were after. :)

Many thanks for your answers. I have used

Code:

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WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX

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(leaving out WS_THICKFRAME) and it works fine.