AdjustWindowRectEx () and GetWindowRect () give the wrong size using WS_OVERLAPPED

Question

I want to calculate the full size of the window before opening it. For this, I use the AdjustWindowRectEx () function. My code looks like this for a window with a client size of 640x480:

    wrect.left = 0;
    wrect.top = 0;
    wrect.right = 640;
    wrect.bottom = 480;
    AdjustWindowRectEx(&wrect, WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX, FALSE, 0);

This returns the following values:

    left: -3
    top: -22
    right: 643
    bottom: 483

However, when opening a window using CreateWindowEx () and passing

    wrect.right - wrect.left
    wrect.bottom - wrect.top

as the window size, the size of the physical window size is actually 656x515 pixels. However, GetWindowRect () returns 646x505, that is, the same sizes that were returned by the AdjustWindowRectEx () function, but, as I said, when I take a screenshot of the desktop and measure the size of the window using a paint program, its physical size actually is 656x515 pixels. Does anyone have an explanation?

, 640x480, , , , AdjustWindowRectEx() GetWindowRect().

Windows 7.

EDIT:

downvoted, ? MSDN, WS_OVERLAPPED AdjustWindowRectEx(). WS_OVERLAPPED? WS_OVERLAPPEDWINDOW , WS_THICKFRAME WS_MAXIMIZEBOX, .

, . , , , , GetWindowRect().

#include <stdio.h>

#include <windows.h>

#define CLASSNAME "Test"

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{  
    return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wcx;
    RECT wrect;
    HWND hWnd;
    char tmpstr[256];

    memset(&wcx, 0, sizeof(WNDCLASSEX));

    wcx.cbSize = sizeof(WNDCLASSEX);
    wcx.style = CS_HREDRAW|CS_VREDRAW;  
    wcx.lpfnWndProc = WindowProc;
    wcx.hInstance = hInstance;
    wcx.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcx.hbrBackground = GetStockObject(BLACK_BRUSH);  // important! otherwise a borderless window resize will not be drawn correctly        
    wcx.lpszClassName = CLASSNAME;

    RegisterClassEx(&wcx);

    wrect.left = 0;
    wrect.top = 0;
    wrect.right = 640;
    wrect.bottom = 480;     
    AdjustWindowRectEx(&wrect, WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX, FALSE, 0); 

    hWnd = CreateWindowEx(0, CLASSNAME, "Test", WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX|WS_OVERLAPPED, 0, 0, wrect.right - wrect.left, wrect.bottom - wrect.top, NULL, NULL, hInstance, NULL);
    ShowWindow(hWnd, SW_SHOWNORMAL);

    GetWindowRect(hWnd, &wrect);
    sprintf(tmpstr, "%d %d %d %d\n", wrect.left, wrect.top, wrect.right, wrect.bottom);

    AllocConsole();
    WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE), tmpstr, strlen(tmpstr), NULL, NULL);

    GetClientRect(hWnd, &wrect);
    sprintf(tmpstr, "%d %d %d %d\n", wrect.left, wrect.top, wrect.right, wrect.bottom);
    WriteConsole(GetStdHandle(STD_OUTPUT_HANDLE), tmpstr, strlen(tmpstr), NULL, NULL);

    Sleep(10000);

    DestroyWindow(hWnd);        
    UnregisterClass(CLASSNAME, hInstance);          

    return 0;
}   

Answer 1

GetWindowRect api :

Due to compatability requirements, certain metrics are reported in such a way that they're not consistent with what is actually drawn on the screen when Aero Glass (more accurately, "Windows Vista Aero") is enabled. This sort of approach is needed in order to change the look of the system for the vast majority of apps for which this isn't an issue.However, there been a recent change in the system which will be coming out in Vista RC1 that will return the correct rendered value from GetWindowRect() for executables that are linked with "winver = 6.0". This allows new and newly-linked applications to get the "correct" values from GetWindowRect().

GetWindowRect Aero Glass

DwmGetWindowAttribute :

DwmGetWindowAttribute(hWnd, DWMWA_EXTENDED_FRAME_BOUNDS, &wrect, sizeof(wrect));

Answer 2

AdjustWindowRect , .

// Create the window with a nearly correct size
RECT rect;
rect.left = 0;
rect.top = 0;
rect.right = 640;
rect.bottom = 480;  
AdjustWindowRectEx(&rect, WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX, FALSE, 0); 

// try
hWnd = CreateWindowEx(0, CLASSNAME, "Test", WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX|WS_OVERLAPPED, 0, 0, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, hInstance, NULL);

// Get the size that is really required and adjust
RECT rectCreated;
GetWindowRect(hWnd, &rectCreated);
rect.right += rectCreated.right-rectcreated.left;
rect.bottom += rectCreated.bottom-rectcreated.top;

// Resize to let the window fir the inner client aea
SetWindowPos(hWnd,NULL,0,0,rect.right-rect.left,rect.bottom-rect.top,SWP_NOMOVE|SWP_NOZORDER);

// Show it.
ShowWindow(hWnd, SW_SHOWNORMAL);

. , .