We value your feedback.
Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!
Solved
visual c++ memory limitations?
Posted on 2002-05-07
I'm trying to make a simple 2D game, and the program worked fine so far. I use full screen in 16 bits, with 4 different sprites. (and some 20 ships on screen) I checked RAM usage before, and the program uses 1 MB of memory (always).
Now I want to use double-buffering, and therefore I tried to create a back screen buffer (using win32 api only) with:
hbmBuffer = CreateCompatibleBitmap(m_h
This function call fails (returns a NULL pointer) due to unavailable memory. This call requires -at the most- 1.2 MB RAM, I have plenty more. I believe it's due to a setting problem related to Visual C++ 6. What should I change?
Now I want to use double-buffering, and therefore I tried to create a back screen buffer (using win32 api only) with:
hbmBuffer = CreateCompatibleBitmap(m_h
This function call fails (returns a NULL pointer) due to unavailable memory. This call requires -at the most- 1.2 MB RAM, I have plenty more. I believe it's due to a setting problem related to Visual C++ 6. What should I change?
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
-
3
-
3
2- +4
13 Comments
Its not a RAM limitation. Visual C++ Will allow you to allocate as much ram as you have process address space (providing you have the physical ram or pagefile space). I have in one applciation allocated ~1.9GB of memory (in more than one chunk) with no problems.
I'm not sure, but maybe it's trying to allocate video ram. If that's the case it might explain why it's failing.
Mithander
Mithander
It's not trying to allocate video ram.
Either the rect is not properly defined or
there is something wrong with m_hdc.
How is m_hdc obtained?
How do you know it is failing due to "out of memory"?
Mike.
Either the rect is not properly defined or
there is something wrong with m_hdc.
How is m_hdc obtained?
How do you know it is failing due to "out of memory"?
Mike.
Might it be a stack error instead? this is small by default but can easily be increased in project settings...
also, memory allocations must be contigious, so if your ram is fragged, (Nt, xp, 2k) it can fail... but would have to be badly fragged if you can't get a meg or 2.
also, memory allocations must be contigious, so if your ram is fragged, (Nt, xp, 2k) it can fail... but would have to be badly fragged if you can't get a meg or 2.
rect.left = 0, rect.top = 0, rect.bottom = 694, rect.right = 1016 (these are the maximum client area sizes defined for my monitor by Windows)
hdc is obtained by GetDC(hwnd) and normally works fine. (I draw 20 alienships, 1 humanship and some missiles on screen with it.)
I get the error number by:
DWORD error = GetLastError();
which returns 8 as a result, defined as not enough memory in MSDN.
Since I'm using native Windows API, no video memory is involved.
hdc is obtained by GetDC(hwnd) and normally works fine. (I draw 20 alienships, 1 humanship and some missiles on screen with it.)
I get the error number by:
DWORD error = GetLastError();
which returns 8 as a result, defined as not enough memory in MSDN.
Since I'm using native Windows API, no video memory is involved.
I assume that it is not the actual memory that this error code refers to, but to GDI resources running out - are you releasing all GDI resources properly?
OK, I get the error. I've gotta to get some sleep, I called CreateCompatibleBitmap() in between SaveDC() - RestoreDC(). (for some other reason)
Confused...
I get a B and I'm not sure I even answered a question...
Suspect he was calling GetDC() without ReleaseDC() somewhere and he was running low on GDI resources?
I get a B and I'm not sure I even answered a question...
Suspect he was calling GetDC() without ReleaseDC() somewhere and he was running low on GDI resources?
you just made me check how I obtained the handle, and suddenly my code starting working. I gave a B because the answer wasn't a direct one. (Honestly, I didn't expect a direct answer. I post as small code fragments as possible to keep the experts interested.)
Just by checking? sounds a bit like quantum physics to me :-)
Well I'm glad it's working and I helped in some way.
Regards,
Mike.
Well I'm glad it's working and I helped in some way.
Regards,
Mike.
Featured Post
We value your feedback.
Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.
Suggested Courses
Course of the Month10 days, 17 hours left to enroll
718 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.