How can I change the background color of a button WinAPI C++

Question

I have searched this many times, but everything I find is MFC. I want it in C++ WinAPI. I know how to change the style of a button control, but I cannot find out how to ma

Answer 1

You can edit a button(which has the flag BS_OWNERDRAW) in the message WM_DRAWITEM on the DialogProc(MSDN About WM_DRAWITEM), heres a simple example of how to draw a simple button:

LPDRAWITEMSTRUCT Item;
    Item = (LPDRAWITEMSTRUCT)lParam;
    SelectObject(Item->hDC, CreateFont(16, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, "Arial Black"));
    FillRect(Item->hDC, &Item->rcItem, CreateSolidBrush(0));
    SelectObject(Item->hDC, CreateSolidBrush(0));
    if (Item->itemState & ODS_SELECTED)
    {
        SetTextColor(Item->hDC, 0);
        SelectObject(Item->hDC, CreateSolidBrush(0xFF00));
        SelectObject(Item->hDC, CreatePen(PS_SOLID, 2, 0xFF00));
    }
    else
    {
        SetTextColor(Item->hDC, 0x00FF00);  
        SelectObject(Item->hDC, CreatePen(PS_SOLID, 2, 0x00FF00));

    }
    SetBkMode(Item->hDC, TRANSPARENT);
    RoundRect(Item->hDC, Item->rcItem.left, Item->rcItem.top, Item->rcItem.right, Item->rcItem.bottom, 20, 20);
    int len;
    len = GetWindowTextLength(Item->hwndItem);
    LPSTR lpBuff;
    lpBuff = new char[len+1];
    GetWindowTextA(Item->hwndItem, lpBuff, len+1);
    DrawTextA(Item->hDC, lpBuff, len, &Item->rcItem, DT_CENTER);