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I have a dialog application which hosts several sub dialogs. I need to send a message from one of the sub dialogs which can be received by all of the other sub dialogs. What's the best way to do this in MFC?
Todd Smith
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Are the dialogs modeless?
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Yes, the dialogs are modeless.
Todd Smith
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If they are all children of a certain window use CWnd::SendMessageToDescendants
John
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Good call, John. I was cooking up something much harder for him.
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My first thought was to save a list of hwnds... But then I remembered about child windows...
John
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SendMessageToDescendants works great except that it sends the message to the current window as well as the children. Annoying but I worked around it.
thx
Todd Smith
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Does anybody know the best way/tool to merge source codes when
you are working with a lot of programmer except VSS?
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sdfdsfa wrote:
...working with a lot of programmer except VSS?
What does this mean? Are you wanting to merge the source code from several different programmers but you are not using VSS?
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Hi,
How can I delete a saved bitmap using the dfile name??
Ehsan Behboudi
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Use DeleteFile(), SHFileOperation(), or CFile::Remove().
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All of the above + _unlink
John
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Is there a way to properly display the new "XP" transparent 32-bit bitmaps (24b color + 8b alpha channel) as "normal" masked 24-bit bitmaps in Windows 2000/98?
I would like to avoid having to create 2 versions of every bitmap (XP version, Win2000/98 version), however the result I get is that the transparent sections in the 32-bit bitmap are displayed as a black background in Windows 2000/89. I would like to be able to choose the color in which the transparancy is converted into.
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Hi All,
I was wondering if someone could tell me the reason why my project builds every single file in my project everytime I try to execute the exe file? After i build the code, make no changes and hit the execute it says all the .obj file are out of date. It never did this before, but all of a sudden it is making me build all the .obj and exe twice.
I already did a clean and it still does it. I thought if i don't make any changes, the file would know this and not build them all again.
Many thanks in advance
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Try generating a make file. If the same problem occurs with nmake, maybe you'll be able to spot the dependency loop in the make file.
Brad
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This might sound like a stupid suggestion, but check the date/times on all the source modules. If any of them are in the future, this will happen. Happened to me once when someone screwed up the machine we used as a time server, when it got temporarily set to some time in 2007...
Steve S
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Why Transparrent blt not works in following code:
works with usual ::BitBlt()
<br />
works:<br />
::BitBlt(di.hdcDraw,<br />
0,0,100,100,<br />
m_hMemDC,<br />
0,0,
SRCCOPY );<br />
<br />
<br />
::TransparentBlt(di.hdcDraw,<br />
0,0,100,100,<br />
m_hMemDC,<br />
0,0,100,100,<br />
RGB(0,0,128) );<br />
<br />
__________________<br />
<br />
m_hMemDC = CreateCompatibleDC(0);<br />
<br />
HANDLE hOLDBitmap;<br />
<br />
hOLDBitmap=SelectObject(m_hMemDC, hBitmap);<br />
... code at above<br />
<br />
:DeleteDC(m_hMemDC);<br />
<br />
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I never could get TransparentBlt to work on win 9x, so I just use the true mask method which I found at http://www.codeguru.com/bitmap/CISBitmap.shtml[^]
Sonork 100.11743 Chicken Little
"You're obviously a superstar." - Christian Graus about me - 12 Feb '03
Within you lies the power for good - Use it!
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Hi, I'm making a Dialog Based MFC app and need to initialize a variable that keeps track of how many times a certain button was pushed (OnButton1()). I tried initializing in in OnInitDialog(); but it still gives me an unidentified error when I try to manipulate it in the function. I can't initialize it in the function itself because then each time the function is called it will be reinitialized to 0. Should I create a member variable for the function? Any help would be great. Thanks.
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Anonymous wrote:
I tried initializing in in OnInitDialog(); but it still gives me an unidentified error when I try to manipulate it in the function.
Did you declare the variable in the class? An unidentified error (in a member function) has nothing to do with where you initialize it but where you declare the variable.
Anonymous wrote:
I can't initialize it in the function itself because then each time the function is called it will be reinitialized to 0.
If you declare it in the function you can initialize it there also if you use the static keyword before your declaration but this is not used as much as a regular member variable. Making it static will only initialize it once for the life of the dialog class.
John
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What is 'a member variable for the function'? If it's a member variable of your dialog class, then yes, that is what you should do. You can also make a static variable:
<br />
class FooDialog : public CDialog<br />
{<br />
void OnButton1()<br />
{ <br />
static int counter = 0;<br />
counter++;<br />
}<br />
}<br />
<br />
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Thanks for the help with the static. My counter works now, but can you show how to make OnButton a return function or someother way for other functions to use the counter variable? Thanks
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Hello,
Add a memeber variable in your class:
int m_nCounter;
In the constructor add:
m_nCounter = 0;
In the OnButton1() add:
m_nCounter++;
remove:
static int counter = 0;
counter++;
this should do the trick... 
A student knows little about a lot.
A professor knows a lot about little.
I know everything about nothing.
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When I read this question the first time I was screaming inside... What you want has nothing to do with a dialog and has everything to do with knowing basic C++. These are basic properties of classes in general. I would suggest looking at a C++ tutorial before trying to make a complicated MFC program.
Here is one that should help:
http://www.codeproject.com/useritems/beginnerclass.asp[^]
John
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