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I'm hoping someone can help, I'm using a visual studio MSI file to deploy an applicaton that was written purely in C some time ago. I need to deploy the application without using the .Net framework in any way as it has to be deployed on a corporate XP build that doesn't have .net installed. I can get the application to install ok but when it comes to the reinstall I need to delete the previously installed directory along with its contents before the application can be reinstalled. I've created a custom action and will be placing the cleanup code inside a dll.
My current thinking is centered around:
1. Calling the dll cleanup function from a custom action (got this working)
2. Getting the OSVersion and current user's username (the install dir resides in the user's documents folder, don't know how to do this)
3. Using a switch case to delete the application folder and its contents (as it will be installed on XP and Vista)
I've been coding in C# for the last 3 years and haven't had much exposure to C/C++. If anyone can help me (suggestions or code  )I'd be most grateful.
Cheers,
Drew
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1) OS Version - You could get operation system version by using the api - GetVersionEx()[^]. You could get a lot of article about detecting operating system version in codeproject[^] itself.
2) You could get the current username by calling - GetUserName()[^] or GetUserNameEx()[^] functions.
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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Hi all,
I have a speed problem In the drawing frame of my graphic MDI application. The problem is that the refresh is very very slow. If i try to drag some menus passing from the drawing frame also them are very slow to refresh (it shows On the screen a visualisation queue(I hope that the concept is clear I don't know the exact word to explain that)).
What are the tipical problem that causes an MDI application to go slow as I described? I think that I'm making some gross error....
Thank you in advance for your suggestion
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What's going on in the drawing code?
Single threaded app? Any drawing from multiple threads?
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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Laan82 wrote: my graphic MDI application.
Not near enough detail.
Laan82 wrote: I think that I'm making some gross error
That is certainly possible, however, a computer system has finite resources. Strain them and things slow down.
led mike
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Resist the temptation to redraw your entire client area when processing a paint message. You should get the invalid rectangle and only draw the contents that fall within it.
CDC::GetClipBox
The situation works best (looks professional) if you create an offscreen buffer(memDC) that is the size of the rectangle returned from CDC::GetClipBox and draw to it then blit it to the original dc when you are done drawing.
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Thank you all for your help. Excuse me If I don't reply before but my pc crush in the last night. For the offscreen drawing I'm also now using it. But I have a doubt... In same part of my application I draw some of the object that I initialize (CLine,CRectangle and other object that I have created with their own Draw method) without use the offscreen buffer tecnique. How Can I use the offscreen buffer without use the OnDraw method? In other word how can I paint in some location of my code without use the central OnDraw method using double buffering? Another problem happens when I call InvalidateRect this function seems to be very very slow how could I replace It? Another question is: Will the program be faster if I use an SDI interface(I create an MDI application but now I have understood that I don't really need it)? Al least for multithreading I'm now using only two thread, the secondary thread is a working thread made in the "old way" (I have made a new class in order to make an efficient thread) and this thread doesn't interfere with the draw.
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hello friends
i want coding for my problem.i have some file say text ,pdf or any type of file whatever size it have ,i want coding how to hide the size of that file or make a fake size of that file or convert it into a 0 byte.please help me in full coding in c++.
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indiraagandhi wrote: ...or convert it into a 0 byte.
See here.
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Do You really want to trick the file attributes to make explorer showing a fake size? Why?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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because i am working on concealed msg system & i do not want to show the size of hide file to an unauthorised user , for that i want this code
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Well, I think NTFS - Alternative Data Streams[^] will be a perfect solution for you.
First open a new stream for your file. The normal file api's will be enough. Then Save your data into the new stream and truncate the main stream. So in explorer it seems the file is empty as you wish and in the mean time, you have the hidden data under it as well. And obviously it needs NTFS file system.
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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How to append a new menu item to global system menu. I.e. to system menu of all applications. Well, for a single application it can be done easly by using GetSystemMenu(). But how to do it system wide?
I saw one application doing the same. When i checked the dlls, of the application I could see the MouseHookProc() in exported functions and I guess that its doing it by a global mouse hook. But after long R&D I couldn't figure out how. Any hints guys?
Thanks & Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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Well, even Jijo raj wasn't able to do that, so far...
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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I did expect you'll reply with some funny quotes. 
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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This time I have no technical answer, unfortunately... 
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Don't worry mate. At least you cheered up me!
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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You can ask of your site.
Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )
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Jijo,
I never tried this can't you use systemwide api hooking?
-Sarath.
"Great hopes make everything great possible" - Benjamin Franklin
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yeah! That seems to be a possibility. I could hook GetSystemMenu() and add another system wide window message hook for WM_COMMAND and handle the message. But I strongly feels that there is some easy way to do it.
Well, thanks Sarath for the thought. Ofcourse you always "Shares your thought"! 
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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What about Using EnumWindows to get all top level windows and then modify the menu? Also you will have to add hook for new window creation notifications. I dont know if it will work but just a thought..
Regards,
Sandip.
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That's also a possibility to experiment. I think, in order to handle the message, i've to add one message hook as well. isn't it? Well, thanks a lot Sandeep and my 5 points.
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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I haven't tried it with 'Mouse Hook', but did with 'Windows Procedure Hook'. Installed a hook for WH_CALLWNDPROC (Windows procedure) and handled the 'WM_INITMENU' message in the hook. Once you get the window handle in the hook, I hope you don't need any more clues.... 
- Malli...! ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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That seems to be a cool Idea! Let me try it out. Thanks a lot malli, and please accept my 5 points. 
Regards,
Jijo.
_____________________________________________________
http://weseetips.com[ ^] Visual C++ tips and tricks. Updated daily.
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