reference prob with namespace C++ - C / C++ / MFC Discussion Boards

::__argv ist NULL, but ::__argc is correct, why?

Erik25-Sep-11 23:58

25-Sep-11 23:58

Hi,

I am currently writing a unicode MFC application in VS 8, and I want to get my commandline arguments. So I use ::__argv and ::__argc, but while the argument count is always determined correctly, ::__argvs always NULL in my Apps InitInstance-method.

Why? m_lpCmdLine however works, but I'd rather want to use __argv. Any hint why this parameter is always NULL?

Re: ::__argv ist NULL, but ::__argc is correct, why?

Madhu Nair26-Sep-11 0:29

Madhu Nair

26-Sep-11 0:29

You should use CommandLineToArgvW[^] along with GetCommandLine[^] for UNICODE applications.

Re: ::__argv ist NULL, but ::__argc is correct, why?

jk chan26-Sep-11 3:52

jk chan

26-Sep-11 3:52

did u try __targv, i am not sure. just give a try.

If u can Dream... U can do it

Install LSP(Layered Service Provider) without a reboot?

Syouki_kou25-Sep-11 20:28

Syouki_kou

25-Sep-11 20:28

Generally speaking, installation or uninstall for LSP need a reboot. Is that possible not reboot after installation or uninstall in server edition windows, like 2003, 2008? If so, how could i do it, Any link or tip will be appreciated.

write multistring value to ADS key

jkirkerx25-Sep-11 13:08

jkirkerx

25-Sep-11 13:08

I'm missing something here. I can write a single value to a ads key, but I can't write a multistring value. I've been googling for hours, but can't really find anything on the subject

//Mime Types
	LPWSTR pszMimeMap[] = {
	L".application, application/x-ms-application", 
	L".deploy, application/octet-stream", 
	L".deploy,application/octet-stream", 
	L".flv, video/x-flv",	
	L".manifest, application/-x-ms-manifest", 
	L".msp, application/octet-stream", 
	L".msu, application/octet-stream"};
	dwNumber = sizeof(pszMimeMap)/sizeof(LPWSTR);
	hr = ADsBuildVarArrayStr(pszMimeMap, dwNumber, &var);
    hr = pADs->PutEx(ADS_PROPERTY_UPDATE, CComBSTR("MimeMap"), var); 
	VariantClear(&var);

I get the -214 something error in Hresult instead of the S_OK.

Re: write multistring value to ADS key

Richard Andrew x6425-Sep-11 14:05

Richard Andrew x64

25-Sep-11 14:05

The example in the docs shows to call this function first:

C++

VariantInit(&var);

http://msdn.microsoft.com/en-us/library/aa772179%28v=vs.85%29.aspx[^]

The difficult we do right away...
...the impossible takes slightly longer.

modified 25-Sep-11 20:15pm.

Re: write multistring value to ADS key

jkirkerx25-Sep-11 15:31

jkirkerx

25-Sep-11 15:31

Good Call, I added the line, must of missed it.

Well after hours of testing, I can write the ScriptMaps, but not the MimeMap, I get some -214 error.

hr = pADs->PutEx(ADS_PROPERTY_UPDATE, CComBSTR("MimeMap"), var);

I can write this ScriptMaps key as a multi-string, and it works fine.

};
    LPWSTR pszScriptMaps[] = 
    {
	L".asp,C:\\WINDOWS\\system32\\inetsrv\\asp.dll,5,GET,HEAD,POST,TRACE",
	L".cer,C:\\WINDOWS\\system32\\inetsrv\\asp.dll,5,GET,HEAD,POST,TRACE",
    };
    dwNumber = sizeof(pszScriptMaps)/sizeof(LPWSTR);
    VariantInit(&var);
    hr = ADsBuildVarArrayStr(pszScriptMaps, dwNumber, &var);
    if (SUCCEEDED(hr)) {
        hr = pADs->PutEx(ADS_PROPERTY_UPDATE, CComBSTR("ScriptMaps"), var);
    }
    VariantClear(&var);

modified 25-Sep-11 23:30pm.

reference prob with namespace C++

Schehaider_Aymen25-Sep-11 12:00

Schehaider_Aymen

25-Sep-11 12:00

Hello all,

I'm looking on the way that i could create my own namepsace and use it under C++.

i wrote a .h file

C++

#ifndef FOO_H
#define FOO_H

namespace FOO
{
	int add (int a , int b);
}
	
#endif//FOO_H

and a cxx file

C++

#include "Foo.h"

namespace FOO
{
	int add (int a , int b)
	{
		return (a+b);
	}
}

And in the main prog (test.cxx) i did as shown below

C++

#include <iostream>
#include "Foo.h"

using namespace FOO;

int main(int argc, char **argv)
{
	
	std::cout << add(5, 6) << std::endl ;
	return 0;
}

when i compile the prog it mentions no problems but when i try to execute it it said

undefined reference to `FOO::add(int, int)' Unsure | :~

i look on the net but still having that issue.

how could i make it correct ?

thank you. Wink | ;)

"The Ultimate Limit Is Only Your Imagination."

Re: reference prob with namespace C++

Schehaider_Aymen25-Sep-11 12:39

Schehaider_Aymen

25-Sep-11 12:39

Ok i think that i resolved it by changing the .h file like this

C++

#ifndef FOO_H
#define FOO_H

namespace Foo
{
	int add (int a , int b)
	{
		return (a+b);
	}
}
	
#endif//FOO_H

So that mean's that :

1: when using namespace we can only use header files.
or
2: i ve an error somewhere in my previous files.

could someone help me with that ? i get Confused | :confused:

"The Ultimate Limit Is Only Your Imagination."

Re: reference prob with namespace C++

Emilio Garavaglia25-Sep-11 21:20

Emilio Garavaglia

25-Sep-11 21:20

What you did in your first post is correct.
The problem you run into is a LINKER problem, not compiler (if you are unsure about the difference, study a while how compile and linking process works)

Your "program" is actually made by two sources (main.cxx and foo.cxx): you have to compile them both, and link them together to produce a final executable. both the files must be inside your "project" configuration.

By placing the function definition in the header you solved the problem because now everything you need in known to main.cxx (that's probably the only file you compiled) But if you compile bot files now you will get a "symbol defined more than once" linked error.

So either:
- use separate files, but compile them all
- use only a single "cxx" and define everything the the header. But -in this second case- declare the functions you will define at header level as "inline" (inline int add(int a, int b) { ... }) to avoid multiple definitions in case of multiple compilations.

2 bugs found.
> recompile ...
65534 bugs found.
D'Oh! | :doh:

Re: reference prob with namespace C++

Schehaider_Aymen25-Sep-11 22:48

Schehaider_Aymen

25-Sep-11 22:48

You are all reasons,

I compiled the first post files with VS and in the project settings i included the Foo.cxx file and all worked fine.

I used Geany under ubuntu and in the console i wrote gcc test.cxx Foo.cxx -o Test.o
and then some warnings were releaved.

i think, as you said, i need to go backward and read more about linking files in C++ OMG | :OMG:

thank you for your help. Cool | :cool:

"The Ultimate Limit Is Only Your Imagination."

Re: reference prob with namespace C++

Richard MacCutchan25-Sep-11 23:03

Richard MacCutchan

25-Sep-11 23:03

Blood_HaZaRd wrote:
gcc test.cxx Foo.cxx -o Test.o

This is not correct, the output should be your executable file Test (note executables do not have .o extension). You should then be able to run your program by typing Test at the command prompt. Take a look at the man pages for gcc for more information on compile and link options.

Unrequited desire is character building. OriginalGriff

How to use CMimeMessage to send a mail with attached file?

yu-jian25-Sep-11 3:44

yu-jian

25-Sep-11 3:44

I use method, AttachFile of class CMimeMessage to add a file to mail
CMimeMessage msg;
...
msg.AttachFile(_T("d:\1.txt"), _T("1.txt"));

then use CSMTPConnection::SendMessage(msg) to send this mail, but I find that this mail does not send to my mail box.

The mail account is no problem, because a blank mail can be sent.
I do not know how to use CMimeMessage to send a file ?

Re: How to use CMimeMessage to send a mail with attached file?

André Kraak25-Sep-11 4:38

André Kraak

25-Sep-11 4:38

This Mailer Sample[^] demonstrates the use of CMimeMessage::AttachFile[^].

0100000101101110011001000111001011101001

Watch cannot find symbol $x

AlecJames24-Sep-11 4:35

AlecJames

24-Sep-11 4:35

This is a C console application in VS2008.

I've got a script language similar to C but the host application has very few debug facilites. With a little modification I can convert the script to plain C and run it in a wrapper in a console app. In the script all variables must start $. If I try to watch a variable $x the watch window says:

$x	CXX0017: Error: symbol "x" not found

If I #define $x x it finds it OK but I have to redefine all my variables this way in order to watch them.

Does anyone know why VS doesn't like the leading $ and whether it's possible to configure it to accept it as a normal symbol?

Thanks
A

Re: Watch cannot find symbol $x

Richard MacCutchan24-Sep-11 5:56

Richard MacCutchan

24-Sep-11 5:56

This looks like a mistake on Microsoft's part. Even though they allow a variable to start with a dollar sign, the debugger does not seem to recognise it.

Unrequited desire is character building. OriginalGriff

Re: Watch cannot find symbol $x

Albert Holguin24-Sep-11 6:34

Albert Holguin

24-Sep-11 6:34

If that is an error... interesting catch... Thumbs Up | :thumbsup:

It wouldn't be the first time one part of the MS IDE doesn't match what another part does.

Re: Watch cannot find symbol $x

Richard MacCutchan24-Sep-11 6:43

Richard MacCutchan

24-Sep-11 6:43

Having never used the dollar sign (a Microsoft extension) for identifier names I thought it worth a try.

Unrequited desire is character building. OriginalGriff

VC++ Graphs.

Vijay Rajanna23-Sep-11 7:08

Vijay Rajanna

23-Sep-11 7:08

Hi,
In my VC++ project I have to draw 2D graphs (X,Y). I would like to know which component I have to use for the same.

Also, The graphs should be rendered at run time continuously for the input values, same like display of ECG machine.

I'm using VS 2010 Express edition..

Hope you have understood my issue, kindly reply,

Regards,
Vijay.

Re: VC++ Graphs.

Rajesh R Subramanian23-Sep-11 7:20

Rajesh R Subramanian

23-Sep-11 7:20

Cedric had an article on that. I'm not sure if that would suit your needs, but take a look at it: High-speed Charting Control[^]

"Real men drive manual transmission" - Rajesh.

Re: VC++ Graphs.

Albert Holguin23-Sep-11 8:36

Albert Holguin

23-Sep-11 8:36

Using the Windows GDI is relatively simple once you get used to it. It should be relatively easy to draw 2D graphs with it even at high rates (for high rates, read up on bitblt).

Re: VC++ Graphs.

Vijay Rajanna23-Sep-11 9:01

Vijay Rajanna

23-Sep-11 9:01

Hi,
Thanks all, after exploring I could see that I can directly use "Chart" control provided by VS.

~Vijay.

Re: VC++ Graphs.

Software_Developer23-Sep-11 9:37

Software_Developer

23-Sep-11 9:37

ECG recording, storing, filtering and recognition
ECG recording, storing, filtering and recognition[^]

Re: VC++ Graphs.

Cedric Moonen25-Sep-11 20:31

Cedric Moonen

25-Sep-11 20:31

Hi,

Rajesh already pointed out to my chart control article, but just to let you know that I think it will fit perfectly with your case: it was originaly developed for medical applications (one of the use was for ECG).

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Can I use a SetTimer() API in a console c++ app.

JosephJohnAllen23-Sep-11 5:57

JosephJohnAllen

23-Sep-11 5:57

I have a console application that is using a DLL that uses a SetTimer() call to create a timer and fire a function within itself. The call is below...

SetTimer((HWND)NULL, 0, timer_num, (TIMERPROC)UnSyncMsgTimer)) == 0)

It is expecting to receive timer messages but this never happens, I assume because mine is a console application and not a standard Windows GUI application (like where the DLL was originally used). This stops a key part of the DLLs functionality from working.

My application needs to stay a console application and I cannot change the DLL.

Does anybody know of a work around to make this work?

Thanks, Joseph

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