Re: Loading Dll and calling class's methods - C / C++ / MFC Discussion Boards

amitesh29112-Sep-05 3:58

amitesh2911

2-Sep-05 3:58

hello friends i need to develop a vc++ program which can add new item in menu of excel and can oen a form to insert text in selected cells

MFC Application - Document handling

KSMANN2-Sep-05 3:51

KSMANN

2-Sep-05 3:51

Hello Friends

How can a MFC application determine if it was invoked in response to one of its registered file being double clicked?

regards,
Kuldeep

Re: MFC Application - Document handling

Roger Allen2-Sep-05 6:44

Roger Allen

2-Sep-05 6:44

You can check the command line that was passed to the application.

If you vote me down, my score will only get lower

Re: MFC Application - Document handling

ThatsAlok2-Sep-05 19:28

ThatsAlok

2-Sep-05 19:28

KSMANN wrote:
How can a MFC application determine if it was invoked in response to one of its registered file being double clicked?

In continaution With Mr. Roger, you have use to GetCommandLine() Api to reterive commandline.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Loading Dll and calling class's methods

Bernard382-Sep-05 3:38

Bernard38

2-Sep-05 3:38

Hi,

I'm quiet arrived...
I know how to load a Dll with LoadLibrary, and how to get a pointer function with GetProcAddress. And this, between Borland C++ Builder and Visual C++.
I know, with Borland only, how to return a class's pointer in an extern function (the pointer of the fonction is obtained by GetProcAddress). Then, I can call the class methods in the Dll loaded by loadlibrary.
But in visual, for the moment, i don't arrive to do the same ...

Thanks if you've a sample for instance ! Cool | :cool:

Re: Loading Dll and calling class's methods

Cedric Moonen2-Sep-05 3:49

Cedric Moonen

2-Sep-05 3:49

You could use the same principle as COM works: you have a function that will instantiate the object for you:

void GetObject(YourClass* & pInstance);

Your pointer is passed by reference that means the function won't make a copy of it so if you make a new, you will get the new adress in your program. Inside that function, you can then create your class (with new).

One really important thing is that you have to be carefull with memorory deletion: you cannot delete this object in your program !! It has to be freed in the DLL itselfs ('cause it has been allocated in the DLL memory). The best way to delete the object is to add a function for doing that:

void YourClass::Destroy()<br />
{<br />
  delete this;<br />
}

Hope this helps

Re: Loading Dll and calling class's methods

Bernard382-Sep-05 4:36

Bernard38

2-Sep-05 4:36

Thanks ! But I have one more problem (easyer for you ..) How tell (declare in a header ".h") to the linker that the reference of pInstance->MyMethod isn't to resolved in a ".lib" ??? - Damned visual I'm new in visual C++ lol -

Thanks again, Cool | :cool:

Re: Loading Dll and calling class's methods

Cedric Moonen2-Sep-05 5:12

Cedric Moonen

2-Sep-05 5:12

From what I know, you cannot. The compiler needs to know if the function you are calling is included in the file.

One solution to overcome the problem of including both the *.h and the *.cpp files in your project is to use an interface for your class: you just make your class inherits from a pure abstract class (a class that has no member variables and whose functions needs to be redefined in the child class). Something like:

class MyInterface<br />
{<br />
   // Constructor + Destructor<br />
<br />
   void Method1() = 0;<br />
   void Method2() = 0;<br />
   ....<br />
}

And in a separate file, you define your class that inherits of MyInterface:

class MyClass : public MyInterface<br />
{<br />
   void Method1();<br />
   void Method2();<br />
}

And the functions arre defined in the cpp file of the class.

So like that you only need to provide the .h file of the interface to your program and your program will only use a pointer to the interface. But inside the dll, when you create the pointer, you create in fact the child class.

Hope this helps

isspace. What about isreturn

LCI2-Sep-05 3:35

LCI

2-Sep-05 3:35

There is a function that checks for white space in a string called
isspace(int nTest)

Is there a similiar type function that looks for a "\n"?

I am trying to insert a \r before every instance of \n in an std::string

Re: isspace. What about isreturn

toxcct2-Sep-05 4:03

toxcct

2-Sep-05 4:03

isspace tests for spaces (' '), tabs ('\t') and new lines ('\n')...

why not using std::string::replace("\n", "\r\n") ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: isspace. What about isreturn

LCI2-Sep-05 4:30

LCI

2-Sep-05 4:30

That sounds like what i need. Was not aware of that.

What would the syntax look like for this?

I have

std::string Response;
//Response has large amount of text with many "\n"'s

Response.replace ("\n","\r\n"); i get an error 2661 on this line
//The above line should parse throuh and replace all occurrances of \n with \r\n right.

Re: isspace. What about isreturn

toxcct2-Sep-05 4:36

toxcct

2-Sep-05 4:36

you will find your happiness here[^]...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

I need to load custom data to Analysis Server (MS-OLAP) without going through any OLE DB

kuldeepjangir2-Sep-05 3:15

kuldeepjangir

2-Sep-05 3:15

Hello,

I am developing an application where I need to load custom data to Analysis Server (MS-OLAP) without going through any OLE DB Provider.
I am able to load data into dimensions/cubes using Microsoft OLE DB provider for ODBC Drivers. But my requirement is loading data at runtime from a buffer. Is there any way to do this? Are there any APIs which can help me to load this data directly?

Thanks & regards,

kuldeep kumar

0xc0000005 access violation --- Need Urgent help...

Smita Duraphe2-Sep-05 3:06

Smita Duraphe

2-Sep-05 3:06

I have an ATL server exe multithreaded application and vb ActiveX Control as client. While running this apllication it crashes very randomly. While debugging step by step it does crashes very rarely but for the same if executed the debug exe, it gives error as "Unhandled exception in ntdll.dll :0xc0000005 access violation " The call stack shows

NTDLL! 77fcc1e1()
KERNEL32! 7c57919d()
CNoTrackObject::operator new(unsigned int 16) line 84 + 12 bytes
CThreadSlotData::SetValue(int 1, void * 0x001a7640) line 277 + 7 bytes
CThreadLocalObject::GetData(CNoTrackObject * (void)* 0x5f48f230 CThreadLocal<_AFX_THREAD_STATE>::CreateObject(void)) line 408
CThreadLocal<_AFX_THREAD_STATE>::GetData() line 173 + 13 bytes
CThreadLocal<_AFX_THREAD_STATE>::operator->() line 185 + 15 bytes
AfxGetModuleState() line 235 + 10 bytes
AfxGetModuleThreadState() line 253 + 5 bytes
AfxTermThread(HINSTANCE__ * 0x5f500000) line 283 + 5 bytes
DllMain(HINSTANCE__ * 0x5f500000, unsigned long 3, void * 0x00000000) line 138
_DllMainCRTStartup(void * 0x5f500000, unsigned long 3, void * 0x00000000) line 273 + 17 bytes
NTDLL! 77f830e7()
NTDLL! 77f837f5()
KERNEL32! 7c59b9f0()
KERNEL32! 7c57fe9a()
KERNEL32! 7c57b388()

I am not able to understand where to attack....
I am aware of the general causes for access violation.

Please suggest....at the earliest...
Smita

Keep your hearts free from hate, your mind from worry. Live simply, expect little, and give much. Fill your life with love. Scatter sunshine. Forget self, think of others. Do as you would be done by.

Re: 0xc0000005 access violation --- Need Urgent help...

ThatsAlok2-Sep-05 20:38

ThatsAlok

2-Sep-05 20:38

sduraphe@sarlatech.com wrote:
I am not able to understand where to attack....
I am aware of the general causes for access violation.

This type error generally come when you try to write on unintialised Pointers

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Outlook mail list

Member 2434132-Sep-05 2:36

Member 243413

2-Sep-05 2:36

Hi!
i want to read emails that have been downloaded in my outlook express.can anybody help me in this context.quick response will be highly appreciated.
regards
Aman-ul-haq

Re: Outlook mail list

ThatsAlok2-Sep-05 19:30

ThatsAlok

2-Sep-05 19:30

aman_ul_haq1888@hotmail.com wrote:
want to read emails that have been downloaded in my outlook express

IStoreNameSpace and IStoreFolder Interface will help in your case. Also, you can refer to this article....
http://www.codeproject.com/com/Outlook_Express_Messages.asp[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

DirectX SDK impact on performances

uplink22-Sep-05 2:18

uplink2

2-Sep-05 2:18

Hi,

I am thinking about installing DirectX9 SDK, but I am affraid about the performance impact.
I suppose the SDK comme will some "debug feature enabled" versions of DirectX libs.
Will those libs be used by commercial applications (i.e. games) instead of the normal end user ones and will it impact speed or stability ?

I am using Visual C++ 6.0 (SP6) on XP Home SP2.

Thanks for your advices/tips,
Th.

-- modified at 9:16 Friday 2nd September, 2005

Re: DirectX SDK impact on performances

LeFauve2-Sep-05 6:20

LeFauve

2-Sep-05 6:20

Perhaps you may re-install single user DirectX after the SDK?

Eric

"If it is not broken, do not fix it"

Re: DirectX SDK impact on performances

LeFauve3-Sep-05 23:51

LeFauve

3-Sep-05 23:51

After checking, it seems that you have a choice in DirectX control panel applet to use retail or debug versions.

Be aware that there are settings for many modules (Direct Input, D3D, ...).

But... (you'll hate me Poke tongue | ;-P

) after setting everything to "retail" I ran DiagFX whichfire me a warning about the fact I used a lib (only one) indebug mode and that it may be slower...

My advice: Use a different computer for coding and playing
Beside your issue, it is always tempting to use beta untested features on a development computer, and most very optimised games do not like this !

Good luck,
Eric

"If it is not broken, do not fix it"

VC6 -> .NET

mcsherry2-Sep-05 2:12

mcsherry

2-Sep-05 2:12

I've got a Visual Studio C++ 6.0 project which I am now trying to get working in VC++ .NET. I've encountered a problem with some file handling code which originally used <fstream.h>, I've changed this to use <fstream> however I am now encountering compilation errors when I'm accessing the file, e.g.

fileA.seekg ( EIGHTWORDS, ios::seek_dir::cur ) ;

it complains about the ios::seek_dir::cur part. Does anyone know what the equivelent 'flag' is in .NET and also where I can get a list of all other flags (MSDN doesn't seem to be much use on this)

TIA,
Andy

Re: VC6 -> .NET

toxcct2-Sep-05 2:40

toxcct

2-Sep-05 2:40

what is the error message ?

did you try prefixing with std:: ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: VC6 -> .NET

mcsherry2-Sep-05 2:54

mcsherry

2-Sep-05 2:54

Thanks for your reply, the exact message I get is:

"error C2510 : 'seek_dir' : left of '::' must be a class/struct/union"

I've tried putting std before it but that has no effect.

Re: VC6 -> .NET

toxcct2-Sep-05 2:59

toxcct

2-Sep-05 2:59

looking at the MSDN[^], you should use ios::cur directly...

the error message tells you that you apply the operator :: to a non object identifier (seek_dir is not a class but an enum)...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: VC6 -> .NET

mcsherry2-Sep-05 3:18

mcsherry

2-Sep-05 3:18

yep your right, thank you for helping me. Big Grin | :-D

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