Error in Qt: undefined reference to `_imp__GetPixel@12'

When I use the function: GetPixel, I get an error: undefined reference to `_imp__GetPixel@12'

#include #include inline int getcolor(int x, int y, HWND hwnd=0) { HDC hdc =(hwnd ==0) ? GetDC(st->getHWND()) : GetDC(hwnd); int color = GetPixel(hdc, x, y); //error, Not compiled return color;
}