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I've tried this before, but I tried it again to be sure.
If you try to get information from a hidden window's DC, you get nothing, or in the best case you get whatever is painted in the area currently taken by it's parent.
or in other words:
<br />
CDC* hiddenWindowDC = hiddenWindow->GetDC();<br />
savedForLater.BitBlt(0, 0, width, height, hiddenWindowDC, 0, 0, SRCCOPY);<br />
This code yeilds nothing, or the parent's bacgkround.
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I saw this in some projects: columns of the header control in a report style CListView can be drag-drop'ed so whole columns of sub-item text are swapped. How do you do this? Thanks.
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That did the work, thank you.
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Hi,
can please somebody tell me if a task pane class for mfc (like the one on the left of the explorer windows in XP) exists, and where can I find it?
Thank you in advance, bye.
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Please describe more. Not enough info.
Where is the panel you wish to imulate?
On what app "Windows Explorer"?
If you mean the left tree view it is a menu selecttion on the last or next 2 last page on app wiz!
Many treeview subclasses are available on this site, just search for TreeView.
Warning it is squirelly.
class CLeftView : public CTreeView
Best Wishes,
ez_way
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Yes, thank you very much for your response and excuse me. Effectively, my description doesn't contain enough infos. 
The panel I mean is the one that is present in the "My computer" windows of WinXP, and in almost every windows when you browse your disk. More specifically, the one with 3/4 panels that can be clicked and, when you do so, a list of possible actions compares. Furthermore, each clickable voice has a double arrow on the right (up/down directed).
I hope that now my descritpion is much clearer ...
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Yes Indeed that is a tree control.
Try this
Start a new application in VC5 or later.
Step 1 of 6 Select SDI
Step 2 of 6 Select none
Step 3 of 6 Select none
Step 4 of 6 Leave as is
Step 5 of 6 Select Windows Explorer // here it
Step 6 of 6 Select CListView
Application type of test:
Single Document Interface Application targeting:
Win32
Classes to be created:
Application: CTestApp in test.h and test.cpp
Frame: CMainFrame in MainFrm.h and MainFrm.cpp
Document: CTestDoc in testDoc.h and testDoc.cpp
ListView: CTestView in testView.h and testView.cpp // see here
LeftView: CLeftView in LeftView.h and LeftView.cpp // see here
Features:
+ Initial toolbar in main frame
+ Initial status bar in main frame
+ Printing and Print Preview support in view
+ 3D Controls
+ Uses shared DLL implementation (MFC42.DLL)
+ ActiveX Controls support enabled
+ Localizable text in:
English [United States]
Be carful while expermenting as it can get strange in a hurry.
Best Wishes,
ez_way
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Hey it was available in msdn.
try this link vcsamplesmfc[^]
In that search for TasksPane. you will find the sample code.
Have a nice time.
Nice talking to you.  If you judge people, you have no time to love them. -- Mother Teresa
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I have a really irritating problem.
In my program, a user can browse images by clicking on two buttons (one going forward and one backwards). After a while the images are no longer displayed. The area is updated, but instead of displaying the image, the area is white.
The shape is still visible though (and updated if I continue browsing) and it is correct. Also the image data to be displayed is correct, as I have seen when debugging the application. But there is no real image displayed to the user, only a white rectangle of the image. The buttons that I use are of a CButton-derrived class that I call ImageButton. At the same time as the image dissapears, the images dissapear from the buttons too!
This occurs after browsing about 200 images, the exact amount is random.
What could be the problem? I am thankful for all comments!
/Killen
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Looks like your app leaks GDI resources. If you are using Windows 2000 or XP you can monitor the available GDI objects through the "Processes" tab of the Task Manager. Just add the "GDI Objects" column.
In Windows 9x you have to right click on "My Computer" and open the properties. One of the tabs should have "System Resources".
Run your app and look at the available GDI resources. Then load a few images and look again. Do not close your app. If the GDI resources decrease you have a GDI leak.
To find the GDI leak use BoundsChecker or Purify. Or simply look through your code and make sure you release icons, images, etc. Also make sure you select all previous GDI objects back in case you are using CDC::SelectObject().
Ivor S. Sargoytchev
Dundas Software
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Thanks!
There was a GDI leak allright. The leak occurs in my drawing function for the ImageButton. Now I only need to figure out what is causing it.
Do you know of any 'typical' pitfalls leading to this kind of leakage?
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Sounds like you are running out of resources. Are you making sure you delete the images no longer showing?
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Sounds like you might not be freeing them. If you are loading bitmaps, make sure to use the DeleteObject( HDIOBJECT ) before continuing on. If this doesn't work, try redrawing the object section with the images using the RedrawWindow( HWND, DWORD ) and see if this kicks it.
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Yeah, it was a call to GetIconInfo which caused the bug. The received bitmaps were never deleted 
Thanks for all your assistance!
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Is there a way of getting Microsoft Visual C++ 6.0 (standard edition) to keep backup copies of files when you edit them? This is the only editor I’ve ever used that doesn’t keep backup files  , unless there’s some option I don’t know about. I would expect such an option to be in Tools->Options->Editor, but it’s not there. 
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Automatic backups for editors truly s*ck since it tends to save exactly the version you don't want...
You need to get yourself some kind of version control handling (cvs (free), sourcesafe (commercial MS), clearcase (commercial IBM/Rational).
And if the paths that I have followed/have tread against the flow/there is no need for sorrow
I am coming home
Return, Crüxshadows
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hi there,im coding in c++,im trying to list all the contents of c:\\,like directorys,files and sub directories,my main aim is to write a file manager,i have used the "findfirstfile" api call to find out if a certain file is in a certain directory,but this isnt achiving what im trying to do,
does anybody have any information regarding how i can list all the files in a directory?
thanx
chris
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Hello!
Try to use wildcards:
WIN32_FIND_DATA data = {0};
HANDLE hFind = FindFirstFile(_T("c:\\*.*"), &data);
....
Hope that helps
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hi ya
thanks for your help,it seems that agsactly what i was missing out 
you proberbly saved me a lot of time,i wuda bin tinkerin with the code for ages.
thanks again
chris
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I'm writing an app. in VC++ and have chosen a dialog project. What is the best way to resize my child windows when resizing my main dialog?
For eg. how to resize a static groupbox?
Should I overload the WM_SIZE for my CDialog class?
Thanks – APe
APe
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Hello!
Context:
- Release version of application (written in C++/MFC) is shipped to the users
- Some users want to write plugins (dll's) for this application
Problem:
- memory allocator is different for debug version and release version
Possible solutions:
- Final application will ship in two versions: release, and release with debug parts
- User will not be able to develop debug version of plugin, only release version
Well, both above solutions are not so good (I do not know other solutions, maybe apart of rewriting everything to COM). But the question is, what should be set in release version of app to allow users to use debug version of it's own plugin? And, what is more important: what will be the impact of using debug components in release version? (This is not really matter of speed, but a matter of cracking the app)
confused
Thanks for some help...any help 
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Releasing a debug version of you app is a matter of trust, since it make it easer of cracker (reverse engineering) easer. If error checking is at a high enough level then users of your app who wish to develop plugins can use the release version of you app.
How you allocate memory, in the debug version, is irrelevent to the development of a plugin. The only reasons for providing a debug version of your application is to provide more information to the plugin developer to help with debuging his/her code and or to get feed back as to why a bug in thier plugin caused a problem in your application (could be very usefull).
I know you have a lot to think about, but weigh your decision carefully.
If you can, place youself in the position of the plugin designer and try to develop a plugin for the release version. Write down what the plugin designer knows about the development of a plugin for your application and try to think from their perscpective (if they could not know it then put it out of your mind). This will not only help you get theit perspective on developing plugins for you application but help you determine what information that you need to release to make it easer for them.
I do not know if any of this helped you. Just remember in order to help the other guy/girl you first must place youself in thier shoes.
INTP
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