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Hi All.
I have a simple question...
Lets say I have a C++ DLL with one exposed fucntion.
Now, If this fucntion get called from C++ Source code OR from C# Source code, then do we any difference on the basis of calling language, as far as performace of this DLL[exposed function] is concerned?
In case you need any further information, please let me know.
Thanks
PanB
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Your question is unclear.
It is a crappy thing, but it's life -^ Carlo Pallini
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Ok.
Lets say I have a Win32 C++ DLL and there is an exposed function Calculation().
Now if I call this function from C++ Source Code OR if I call this from C# Source code, then will there be any performance issue, as far as function Calculation() is concerned?
Thanks.
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What does your profiling test results say?
It is a crappy thing, but it's life -^ Carlo Pallini
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I have not done any profiling OR I even dont have any setup like that.
Just want to have a view from other side? As per my understanding there should not be any difference in terms of performance. What do you say?
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IIRC it depends on the number and type of parameters you pass to it and the return value. Short functions have significant overhead, especially if they have string arguments.
Why didn't you just test it though?
PankajB wrote: I have not done any profiling OR I even dont have any setup like that.
So which is it?
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It seems that you did'nt get me.
Case 1:
Win32 DLL is being used by C++ application. Called an exposed function, lets say ABC().
Case 2:
Same Win32 DLL is being used now by C# application. Called an exposed function, lets say ABC().
[Previous C++ Application closed. Both of these callings C++/C# are independent to each other]
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Managed code is slower than native, but just for calling a function in a library, I don't think there should be any difference as such. Further more, if you are talking about the execution time of the function within the DLL, that should remain the same (within the DLL), no matter what environment are you executing it from.
I recommend that you do a little profiling and test it out. You don't need any setup as such. VS 2008 has profiling features inbuilt, or you could use a high resolution counter to find out how long has the function taken to execute from within the test environment (native or managed).
It is a crappy thing, but it's life -^ Carlo Pallini
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I did get you.
Case 1: nothing to see here, normal case.
Case 2: even if the C++ application was still running, it has nothing to do with it. Nothing. Why did you even bring it up? Anyway, a call from C# to a native function requires marshaling of the arguments and the return value (if it returns), which is obviously slower than not marshaling. The amount of marshaling is (equally obviously) dependent on the number of arguments and their type (so for some types, also of their size)
edit: oh and IIRC the .NET runtime also does some safety checks with regards to the stack, but I don't know what it checks
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The native DLL is compiled. In theory, the functions within it will have the same performance regardless of what program is calling it, be it C++, C#, VBA, etc.. The theory falls down once you look at the program in question as a whole. Due to paging, the memory cache, pipelining issues, how the call is made (i.e interop) and so forth, the actual performance in real world conditions may vary.
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Hi all,
I m working on MFC applications,i have some things by which my application detect by antivirus.
List of actions are mention as follows that is detected by antivirus.
1. Key hook of keyboad.
2. Sending an email by my application.
3. Use Shell execute to run another application.
4. Command use to put an application in startUp.
...
please tell me how can i do all these work without detecting by antivirus.
Please help me for this.
thanks in advance.
To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.
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"_$h@nky_" wrote: I m working on MFC applications,i have some things by which my application detect by antivirus.
List of actions are mention as follows that is detected by antivirus.
1. Key hook of keyboad.
2. Sending an email by my application.
3. Use Shell execute to run another application.
4. Command use to put an application in startUp.
...
please tell me how can i do all these work without detecting by antivirus.
Most of my applications do all of these, most of the time, and none of them were detected as a virus by any AV program. What else is your program doing?
It is a crappy thing, but it's life -^ Carlo Pallini
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On other application not detected by any AV.
one more thing that is i m not mentioned,If i m use same code in VB.net than also its detected by AV.
Suggest me some solution for VB.net also.
To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.
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A lot of anti-virus/spyware/malware suites will alert users when an application attempts items 1, 2 and 4 on your list IF the application is not digitally signed. Once the user gives that application permission to execute those tasks the AV software is unlikely to show the alert again unless the executable is changed.
Chances are your AV software is displaying an alert every time you recompile because the executable has changed.
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How can i digitally signed my application.
To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.
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Please provide me any example for apply digital signature.
thanks.
To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.
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Ummmmmmm you might want to try a different approach. I suggest giving Research 101[^] a try.
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good day,
is it possible to display the values/result from the editbox to the listbox? by how?
m_list.???
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CEdit::GetWindowText() and CListBox::AddString() should help you.
It is a crappy thing, but it's life -^ Carlo Pallini
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what is the exact code to get the value of the editbox (variable type double) and displays in the listbox?
i tried : m_list.GetText(m_list.GetCurSel(), m_edit1) but after building committed errors...
please help.
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Instead of having the variable type as double, I'll recommend that you have it as a control variable, and call m_Edit.GetWindowText() and then convert it to a number with _ttol() or _ttoi(), etc.,
It is a crappy thing, but it's life -^ Carlo Pallini
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can u please give me some sample code of it? i dont know how to use tt01() or ttoi?
please help...
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thank you my code is runnig now i just change it to control and use getwindowtext.
thank you very much
neil
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Hi all,
I know global variables are bad. I'm trying to write my first game. Its like tetris where you have different shapes. I have a linked list of shapes. Where am I supposed to declare this list in a Win32 app?
I thought the best place would be in the LRESULT CALLBACK WndProc under the switch(msg) case WM_CREATE. However, I'm getting some errors doing that (some error about the initialization being skipped by some case labels).
I cant declare the list in WinMain because I need to use it in LRESULT CALLBACK to modify its content...
Currently, I have my list declared as a global variable and it works well like that. I'm trying to understand what the alternative is (trying to develop good coding habits).
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