Question

How to detect the current screen resolution in C++ Win32 API

Answer 1

#include <Windows.h> 
#include <sstream>

bool GetScreenResolution(unsigned int* pwidth, unsigned int* pheigth) {
    const HWND desktopWindow = GetDesktopWindow();

    RECT desktopRectangle;

    if (desktopWindow && GetWindowRect(desktopWindow, &desktopRectangle)) {
        *pwidth = desktopRectangle.right;
        *pheigth = desktopRectangle.bottom;

        return true;
    }

    return false;
}


int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    unsigned int width = 0, heigth = 0;
    std::string s;

    if (GetScreenResolution(&width, &heigth)) {

        std::ostringstream oss;
        
        oss << width;
        oss << " x ";
        oss << heigth;
        oss << " pixels";

        s = oss.str();
    }

    MessageBoxA(0, s.c_str(), "info", MB_OK);
    
}


/*
run:

2560 x 1440 pixels

*/

 

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