#include <windows.h>
#include <stdio.h>

BOOL IsWindowGUI(HWND hwnd) {
    DWORD style = GetWindowLong(hwnd, GWL_STYLE);
    return (style & WS_CHILD) != WS_CHILD && (style & WS_POPUP) == WS_POPUP;
}

int main() {
    HWND hwnd = GetDesktopWindow(); // デスクトップウィンドウのハンドルを取得
    if (IsWindowGUI(hwnd)) {
        printf("GUI is present in the main window.\n");
    }
    else {
        printf("No GUI present in the main window.\n");
    }
    return 0;
}