C / C++ / MFC

cedricvictor wrote:

so that I can process the absolute coordinate to windows desktop

1. This site does not provide code to order. Google is the place for samples.
2. The consequences of a race condition may vary from incorrect results, to a program not responding.
3. There are many different situations when this may be appropriate, but it depends on the problem to be solved.
4. Impossible to answer as any problem's ease of resolution depends on a lot of factors.

Richard MacCutchan wrote:

What is the connection between mult-threading and rounding errors?

void EnableButton(CMFCRibbonButton& ribbonButton, bool bEnable)
{
    ribbonButton.Enable(bEnable);
}

void EnableButtons(int nRule, bool bEnable)
{
    switch (rule)
    {
    case 1:
        ribbonButton1.Enable(bEnable);
        ribbonButton2.Enable(bEnable);
        break;
    case 2:
        ribbonButton1.Enable(bEnable);
        ribbonButton6.Enable(bEnable);
        ribbonButton7.Enable(bEnable);
        break;
    // ... etc
    }
}