WinAPI: Create a window with a specified client area size

Question

I was wondering how can I create a window using Win32 API with a specific client area size.

When trying to create a window using the following piece of code, the entire window is 640x480, with the window's chrome taking some of the client area:

HWND       hWnd;
WNDCLASSEX WndClsEx;
ZeroMemory(&WndClsEx, sizeof(WNDCLASSEX));

WndClsEx.cbSize        = sizeof(WNDCLASSEX);
WndClsEx.style         = CS_HREDRAW | CS_VREDRAW;
WndClsEx.lpfnWndProc   = DefWindowProc;
WndClsEx.cbClsExtra    = 0;
WndClsEx.cbWndExtra    = 0;
WndClsEx.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
WndClsEx.hCursor       = LoadCursor(NULL, IDC_ARROW);
WndClsEx.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
WndClsEx.lpszMenuName  = NULL;
WndClsEx.lpszClassName = TEXT("Title");
WndClsEx.hInstance     = hInstance;
WndClsEx.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

RegisterClassEx(&WndClsEx);

hWnd = CreateWindowEx(  NULL,
            TEXT("Title"),
            TEXT("Title"),
            WS_OVERLAPPEDWINDOW,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            640,
            480,
            NULL,
            NULL,
            hInstance,
            NULL);

Assuming simple math won't quite solve the problem, how do I take the chrome size into account?

Note: I'm using SDL after creating the window, but I'm guessing it's bound to the window size and makes no difference to its size.

Solution

You can use the AdjustWindowRect or AdjustWindowRectEx function to calculate the window size given a desired client area size.

Comments

[engf-010]

Correction ,it calculates the coordinates of the Window-Area based on the coordinates of the Client-Area.

[zwcloud]

A related answer on why AdjustWindowRect cannot be used with WS_OVERLAPPED.