C / C++ / MFC

31-Jul-09 12:40

Is there a way I can check to see if I have exceeded array bounds in C++ using Visual Studio 2008?

Richard Andrew x6431-Jul-09 13:49

Richard Andrew x64

31-Jul-09 13:49

It depends what you're looking for. There is a compiler switch for buffer overrun checking: /GS

You could also use guard pages to trigger an exception if you write past the end of a buffer/array.

But there is nothing that will neatly throw an exception if you write outside of an array.

Fred Andres7-Aug-09 10:46

7-Aug-09 10:46

I really appreciate the advice

Randor 31-Jul-09 15:00

Randor

31-Jul-09 15:00

You could use something like the _countof Macro[^] if your using a static array. It is defined as:

#define countof( array ) ( sizeof( array )/sizeof( array[0] ) )

Best Wishes,
-David Delaune

Fred Andres7-Aug-09 10:45

7-Aug-09 10:45

Thanks for the advice

Joe Woodbury1-Aug-09 10:32

Joe Woodbury

1-Aug-09 10:32

If you're willing to spring for BoundsChecker, you can use it to check your program.

Fred Andres7-Aug-09 10:45

What happened to search issue of the forum?

7-Aug-09 10:45

Thanks so much

includeh1031-Jul-09 10:33

includeh10

31-Jul-09 10:33

Search abilities of the forum become worse and worse, I can not find my recent posts anyway.

If I input user name for searching, results list all posts from ancient year and can not sort them descendingly.

If input keywords, result says "no answer" but posts are just there!

many problems!

Re: What happened to search issue of the forum?

jeron131-Jul-09 10:36

jeron1

31-Jul-09 10:36

Perhaps the Site Bugs/Suggestion forum is what you are looking for.

Resource Leak [modified]

od@ananzi.co.za31-Jul-09 9:30

od@ananzi.co.za

31-Jul-09 9:30

I have a resource leak that I have thus far been unable to track down. I am using Process Explorer and Task Manager and am monitoring every counter that they are able to monitor. All counters are stable, ie there are no memory leaks, handle leaks, etc that I can detect. However, after my program has run for an hour or so all applications and Windows start giving a whole range of errors, but all of them are related to lack of resources.

The only thing so far that is interesting is the Virtual Size value in Process Explorer. It stands at about 1,2GB, while my process's Working Set and Private Bytes is less than 70MB. All other resources are 100% stable after my application started up.

I have enable Microsoft Application Verifier and set GFLAGS to enable all the Heap functions for my process. Alas, no errors. I've also tried Memory Validator, but it gives 100's of errors of uninitialized variables, all in MS code, nothing else really that matters.

Are there other utilities that will enable me to track the actual resource that is leaking ? Any other suggestions maybe as to what type of "undetectable" leak I am experiencing ?

Thanks
OD

modified on Friday, July 31, 2009 3:47 PM

Re: Resource Leak

RomanMzh31-Jul-09 11:38

RomanMzh

31-Jul-09 11:38

A bit more description would be more helpful but not as much as debugging the code, especially places that work with buffers ( strings etc) system managed handles (GDI objects, Global memory etc).

Also:

od@ananzi.co.za wrote:
all in MS code, nothing else really that matters.

It is very possible that YOUR code uses win32 APIs incorrectly causing one of any number of possible leaks.

Re: Resource Leak

Randor 31-Jul-09 15:07

Randor

31-Jul-09 15:07

I agree with RomanMzh in that it sounds like a GDI resource leak. You can use the task manager to see how many GDI objects your application is using. This MSDN Magazine article should give you enough information to track it down.

Resource Leaks: Detecting, Locating, and Repairing Your Leaky GDI Code[^]

Essentially all you need to do is select the 'GDI Objects' checkbox in the select columns dialog. I would recommend selecting 'Handle Count' as well. If either your GDI objects or handle count continues to increment... you may have a leak.

Best Wishes,
-David Delaune

Re: Resource Leak

od@ananzi.co.za3-Aug-09 1:52

od@ananzi.co.za

3-Aug-09 1:52

Hi Guys, I've managed to track down the "leak". The application uses a mailslot to send some frequent statistical data to another process for display. The receiving program was receiving the data a lot slower than the sender was transmitting it, so eventually the Mailslot IPC ran out of shared memory and from there all the problems started.

How to rotate and scale a bitmap using GDI+ ?

transoft31-Jul-09 8:24

31-Jul-09 8:24

Hi,

I want to scale and rotate a bitmap (loaded using GDI+) and save the rotated and scaled bitmap to a file using GDI+.

How can I do it?

Thanks,

Randor 31-Jul-09 15:37

Randor

31-Jul-09 15:37

transoft wrote:
I want to scale and rotate a bitmap

Have a look at the Graphics::RotateTransform Method[^]

transoft wrote:
and save the rotated and scaled bitmap to a file using GDI+.
How can I do it?

The GDI+ Bitmap Class[^] inherits from the Image Class[^] which has a Image::Save Method[^]

Best Wishes,
-David Delaune

transoft31-Jul-09 16:14

31-Jul-09 16:14

Hi
Thank you very much for reply.

The Graphics::RotateTransform Method[^] only rotate the graphics object. not the bitmap.

How can I rotate the bitmap?

Or How can I get bitmap from Graphics?

Thank you very much,

Randor 31-Jul-09 17:41

Randor

31-Jul-09 17:41

transoft wrote:
The Graphics::RotateTransform Method[^] only rotate the graphics object. not the bitmap.

I would suggest researching the classes you are working with. The Graphics Class[^] accepts a an Image object[^] in the constructor.

transoft wrote:
How can I rotate the bitmap?

Or How can I get bitmap from Graphics?

See if something like this works:

Graphics g(hdc);
Image i(L"HelloWorld.bmp");
g.DrawImage(&i,0,1024);
g.TranslateTransform(100.0f, 50.0f);
g.RotateTransform(45.0f);
g.DrawImage(&image,0,0);
CLSID jpgClsid;
GetEncoderClsid(L"image/jpeg", &jpgClsid);
i.Save(pIStream1, &jpgClsid);

heh, I have not tested the above code, it was written here in the reply box. Let me know if it works.

Best Wishes,
-David Delaune

transoft1-Aug-09 2:19

1-Aug-09 2:19

Hi David

I thought that "Graphics.Drawimage" only rotates and scales in the memory and would not affect bitmap.

I will test the code and let you know it works or not.

Best regards,

Randor 1-Aug-09 5:03

Randor

1-Aug-09 5:03

transoft wrote:
I thought that "Graphics.Drawimage" only rotates and scales in the memory and would not affect bitmap.

It does scale/rotate the bitmap in memory. All GDI/GDI+ bitmap operations occur in memory. Then you draw the Graphics object in the Image object and save to disk.

Best Wishes,
-David Delaune

transoft2-Aug-09 4:08

2-Aug-09 4:08

Dear David

Thank you very much for your code? I tried and had no luck. Do you know what happen?

Best regards,

Randor 3-Aug-09 13:37

Randor

3-Aug-09 13:37

transoft wrote:
Do you know what happen?

Well, my sample probably was not quite correct as I wrote it in the reply box. I did this one inside my compiler and tested it:

Gdiplus::Image image(L"HelloWorld.bmp");
Bitmap bmp(1024,1024);
Graphics g(&bmp);
g.TranslateTransform(260.0f,80.0f);
g.RotateTransform(45.0f);
g.DrawImage(&image,0,0);
CLSID  encoderClsid;
GetEncoderClsid(L"image/png", &encoderClsid);
bmp.Save(L"HelloWorld2.png",&encoderClsid);

I confirmed this sample actually works.

Best Wishes,
-David Delaune

transoft4-Aug-09 0:27