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Type: Posts; User: dullboy

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  1. Re: What could be the reasons that a C++ program runs slowly?

    I think memory and poorly written algorithm can cause slowness. But I just want to learn more issues that could cause slowness. Thanks for your inputs.
  2. Re: What could be the reasons that a C++ program runs slowly?

    Thanks so much for everyone's posts. I think memory could cause slowness of the program. If a program has a memory leak issue, then the memory becomes less and less. When it exceeds the physical...
  3. Re: What could be the reasons that a C++ program runs slowly?

    Memory is not an issue for slowness? If a program takes huge memory to run in a PC, it will cause the PC to run very slow, right? Also would you give an example that it spends a lot of time waiting...
  4. Re: What could be the reasons that a C++ program runs slowly?

    It means it takes longer than normal. I just want to find out in general what might cause slowness of a program. It could happen in several situations. For example, the same program runs much slower...
  5. What could be the reasons that a C++ program runs slowly?

    The reasons I can think of that include running out of memory, time-consuming algorithm. What are other reasons? I assume this is not just for windows environment but also any unix-like environments....
  6. Re: What is single-user mode/multiple-user mode of an application?

    Thanks for your reply! So I guess in order to write data, only one user can be allowed to do that. Then we can always rely on database, for example, sql server to achieve that. I can apply an...
  7. Re: What is single-user mode/multiple-user mode of an application?

    Here is what I am thinking. First of all, if we want to make an app a multi-user app, we should allow multiple users to "write" the same data simultaneously. Let's imagine two users are writing the...
  8. Re: What is single-user mode/multiple-user mode of an application?

    I got it. So the key is the same data can be accessed correctly by multiple users simultaneously. Here is an additional related question. How to "write" the same data by multiple users...
  9. Re: What is single-user mode/multiple-user mode of an application?

    Thanks for your inputs! I still don't quite understand it. If a multi-user app is defined as allows multiple simultaneous users, then a single-user app, for example, word also allows multiple...
  10. What is single-user mode/multiple-user mode of an application?

    If we talk about something like an application is single-user app or multi-user app. What does that really mean? Is there any guru here who can share some useful knowledge? Thanks for your inputs.
  11. A question regarding forward slash and back slash

    As we know in unix/linux, forward slash is always used for directory and in windows back slash is used for directory instead. On the other hand, I noticed that forward slash can be also used for...
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    Re: Help with a project under linux

    Thanks so much for your reply. Actually I tried to run configure under linux but I got some error messages. I copy the results after I run ./configure in my project folder in the following,

    ...
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    Re: Help with a project under linux

    I am using g++ under linux. Do you know how to compile the whole project I attached into an executable? Thanks for your inputs.
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    Help with a project under linux

    I am pretty new to linux. I don't know how to compile a project. I attach the project zip file. Does any guru here give me some hints how to compile it under linux? Thank you very much!
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    Re: A strange problem related to def file.

    Actually I did rebuild the dll but it failed. My class is defined in a MFC extension dll and is exported by using AFX_EXT_CLASS. Thanks.
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    Re: A strange problem related to def file.

    It works! Thank you very much! But I had to remove the entry for XXXXFunction in def file first in order to build the project successfully. I couldn't figure out why removing this entry make build...
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    A strange problem related to def file.

    I got a linker error "error LNK2001: unresolved external symbol "public: virtual int __thiscall XXXClass::XXXXFunction(class CWnd *,struct IMyStruct * const)"...
  18. OnClick for list control doesn't work first time

    When I click within a list control, suppose there is an event OnClick fired. In my program, I catch OnClick event by processing the message NM_Click, i.e. ,


    ON_NOTIFY_REFLECT_EX(NM_CLICK,...
  19. IEShowSaveFileDialog doesn't work under win7?

    This is from MSDN ---- "The IEShowSaveFileDialog function works within these restructions by using a medium integrity broker process (IEUser.exe) to call the Windows Common Dialog library". But under...
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    Regarding NSIS scripting

    I am not sure whether this is right forum for installer scripting. I am new to NSIS scripting. I wonder if anybody here can recommend an online resource or a book about NSIS scripting? Thanks for...
  21. A question regarding HKEY_LOCAL_MACHINE and HEKY_CLASSES_ROOT?

    A class id of a COM dll may be created under HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID or may be created under HKEY_CLASSES_ROOT\CLSID in registry. Is there any difference between them? In order to...
  22. Re: Any guru here can explain algorithm for Sudoku?

    Thanks for your response. Actually I almost finished the program. I have a question here. Suppose I try to fill in a completely empty board. First of all, I pick up 9 numbers randomly for the first...
  23. Re: Any guru here can explain algorithm for Sudoku?

    Thanks for your great response. I have several questions regarding your generator. When you have a fully filled sudoku, you hide all the fields and then re-open some of them. How many fields are you...
  24. How to find out why a program is running so slow?

    I have a program running really slow. I found that actually a function takes long time. But by debugging I don't know how to identify which piece of code within this function causes such slowness....
  25. Re: Is it possible to catch VK_DELETE when procsessing WM_CHAR?

    I know WM_KEYDOWN will catch VK_DELETE for sure but I am just curious if it is possible to catch in WM_CHAR. Thanks for your inputs.
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