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How do I take the 1 byte value from it?
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It's the value returned by GetXValue:
COLORREF cr = RGB(64,128,196);
BYTE red = GetRValue(cr);
COLOR16 red16 = red * 256;
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COLORREF colorref = RGB(0x01,0x02,0x03);
TRIVERTEX TriVertex;
TriVertex.Red = (COLOR16)GetRValue(colorref) << 8;
TriVertex.Green = (COLOR16)GetGValue(colorref) << 8;
TriVertex.Blue = (COLOR16)GetBValue(colorref) << 8;
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Hello all.
I have a code something like this:
<br />
void CMyDialog::OnLButtonUp(UINT nFlags, CPoint pt)<br />
{<br />
AfxMessageBox(_T("Trace 1"));<br />
EndDialog(IDOK);<br />
AfxMessageBox(_T("Trace 2"));<br />
}<br />
As far as I know, the dialog must end after a call to EndDialog (it is a modal dialog by the way). Thus, it is showing the second message box. Why is this? 
Any thoughts will be really appreciated.
Thanks in advance. Regards,
Fernando.
A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site
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Even though you've ended processing for the dialog the function still returns and execution
continues on the next line. The return code (IDOK) will eventually be returned from the DoModal()
call that started the dialog.
Also, the docs state:
"EndDialog does not close the dialog box immediately. Instead, it sets a flag that directs the
dialog box to close as soon as the current message handler returns."
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Oh, I see. Then what can I do to end the dialog immediately?
Thanks for your reply.
Regards,
Fernando.
A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site
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That's the way you should end the dialog. The same thing that happens when you click a
default OK or Cancel button or the ESC key.
The dialog should end quickly and return from the original DoModal() call.
You probably shouldn't do anything else except return after calling EndDialog() since message
handling for the window is essentially done.
What is happening that makes you feel it's not ending fast enough?
Mark
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Thanks again for the reply.
The problem is the following. I have a function that is being called from OnLButtonUp. Under determined circumstances, must end the dialog. However, the code is being executed twice... that is, after the EndDialog for some weird reason it is executing the same code again... When it is executed again, it throws me an exception because the dialog has already been destroyed (!).
I think that such problem is caused by remaining messages in the queue or something. I can't figure out what is happening really, and the spy++ is not working.
Tahnks again. Regards,
Fernando.
A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site
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That's what I mean...it's not a good idea to do anything after you've called EndDialog().
Even if it's from a nested function - that function shouldn't do anything except return.
Can you return a value from that function indicating that the dialog has been ended? Check
that returned value and if it indicates the dialog has ended then just return.
Mark
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Put a return statement after the EndDialog().
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Yep, actually there is a return. That is why this issue is freaking me out... In fact, while I was spy++ing the app, I realized that even a WM_CLOSE and a WM_DESTROY message was sent to the application, and then it ran the code again 
Thanks for your reply.
Regards,
Fernando.
A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site
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Are you looking for AfxAbort()?
Nobody can give you wiser advice than yourself. - Cicero
ப்ரம்மா
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Can you show code, how you are using this dialog ?
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Hello. First of all, I'd like to thank you all for the help provided. Indeed, I am so happy now, and after your help and like 50 cigarrettes, I was able to find the bug. Here's the issue.
It was happening something like Mark and Michael told me, about not running a single line of code after the EndDialog. That is, the code must have a return after the EndDialog call. However, in my code there was an EndDialog and a return. Yet in other part of the code, this dialog created another dialog and this new child window, when it ends the dialog, does not have a return and indeed there was more code executing after the call of EndDialog. So a simple return there ended the problem. Something like the following:
<br />
<br />
void CAnotherDialog::EndDialog()<br />
{<br />
DoSomething();<br />
if (m_bSomething)<br />
EndDialog(IDCANCEL);<br />
<br />
DoMoreStuff();<br />
}<br />
<br />
void CMyDialog::DoSomething()<br />
{<br />
CAnotherDialog dlg;<br />
dlg.DoModal();<br />
<br />
if (bSomeFlag)<br />
{<br />
EndDialog(IDCANCEL)<br />
return;<br />
}<br />
<br />
DoMoreStuff();<br />
}<br />
So I just changed it into:
<br />
<br />
void CAnotherDialog::EndDialog()<br />
{<br />
DoSomething();<br />
if (m_bSomething)<br />
{<br />
EndDialog(IDCANCEL);<br />
return;<br />
}<br />
<br />
DoMoreStuff();<br />
}<br />
<br />
void CMyDialog::DoSomething()<br />
{<br />
CAnotherDialog dlg;<br />
dlg.DoModal();<br />
<br />
if (bSomeFlag)<br />
{<br />
EndDialog(IDCANCEL)<br />
return;<br />
}<br />
<br />
DoMoreStuff();<br />
}<br />
Thank you guys, you really saved my nervous system. 
One last thing: should I post this issue in the subtle bugs section, or it was only pure lack of knowledge (stupidity, that is) from my part?
Thanks again.
Regards,
Fernando.
A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.
Personal Site
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Hi,
How can I write an instant messenger (IM) that would scale well with increased numbers of users? Any ideas about implementing the server side and handling a large number of connections? I need a place where I can start from.
Do you have any information about current IMs e.g Yahoo, MSN, .. etc? Specifically about their server side implementations and how they can handle those large numbers of users? Any help is appreciated.
Regards,
Wal
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Waleed wrote: How can I write an instant messenger (IM) that would scale well with increased numbers of users?
This is a trick question in a way, and hopefully I can point you in the direction of a decent solution. The only solution that will scale well is, one in which demand indirectly creates supply, this is most commonly seen in Peer to Peer networking. The more users who join the network imply the more capacity the network has, and all P2P is not evil incidently.
Using the traditional client server approach is dangerous, it may never be able to fully cope with spikes in demand. So I suggest you take a look at Pastry, it is a Microsoft P2P client written in Java funnily enough. Another solution would be to look at Ekiga, the most popular Linux IM solution with the full source code available.
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Thanks a lot, I'm going to look for what you pointed out in your message.
Wal
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I need to insert the binary data from a local file into an image column
in a SQL server 2000 database table. Is there a simple procedure for
this, in C++ ?
cheers,
Neil
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See here and here.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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C++ is not much of a help itself. More likely is a DB API you may prefer (or mandatory to use...). OLEDB is probably the best (and hard sometimes) way for C++.
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Thanks to both of you for the replies. This seems to be quite tricky. I was looking at using SQLPutData().
There doesn't seem to be a T-SQL statement that does such an insert either..
cheers,
Neil
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