C / C++ / MFC

Re: Reading Save File Problem

23-Nov-11 9:31

Please wrap your code using <pre> and </pre> tags... this is painful to look at.

David Crow26-Nov-11 6:50

David Crow

26-Nov-11 6:50

idbee2k3 wrote:
...is working but I am having problem...

That appears to be contradictory. It's either working or it isn't.

idbee2k3 wrote:
Did any one know what is wrong.

Hard to tell since you've not shown any code that reads or writes. The only thing you've shown is menu code which is completely irrelevant to the problem.

Use the debugger to narrow the problem down to just a handful of lines, then come back and post those.

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Using Main to grab command line arguments if it doesn't already exist?

Lucidation23-Nov-11 6:15

Lucidation

23-Nov-11 6:15

First off, I'm not sure if I'm quite in the right forum or not, so just let me know if I should post elsehwere. With that said...

I'm brand new to C++ and am trying to wrap my brain around something. I know that I can use a MAIN function in a .CPP file and use it to grab command line arguments. I'm trying to add this feature to an existing clump of code we've got at work (I'm trying to expand my skills, and it's a small utility we techies use only occasionally). Anyway, I can't figure out how to use a MAIN function if there isn't already one (I can make it work in a brand new test project just fine). My current attempt to tweak the code sort of looks like this:

C++

#include "stdafx.h"
#include ...a few other files.....

class CApp : public CWinAppEx
{
public:
	CApp();
	public:
	virtual BOOL InitInstance();
};

extern CApp theApp;


int main(int argc, char *argv[])
{
	MessageBox(NULL, L"This should display first, but doesn't currently show up at all.", NULL, NULL);
}


// CApp construction
CApp::CApp()
{
	MessageBox(NULL, L"This should display second, but currently shows up first.", NULL, NULL);
}


// CApp object
CApp theApp;


// CApp initialization
BOOL CApp::InitInstance()
//int main(array<System::String ^> ^args)
{
	MessageBox(NULL, L"This should display third, but currently shows up second.", NULL, NULL);
	...does other stuff here...
}

So what do I need to do to use MAIN correctly to grab the command line arguments?

Thanks!

Re: Using Main to grab command line arguments if it doesn't already exist?

Albert Holguin23-Nov-11 7:21

Re: Using Main to grab command line arguments if it doesn't already exist?

23-Nov-11 7:21

It looks like you're using MFC... in which case the main() function is hidden away in the framework. You need to do something a little different.

Here are some examples/documentation:
http://www.codeguru.com/forum/showthread.php?t=386406[^]
http://msdn.microsoft.com/en-us/library/zaydx040%28VS.80%29.aspx[^]
http://www.visualcpp.org/?p=33[^]

Good luck! Smile | :)

Chris Meech23-Nov-11 7:22

Chris Meech

23-Nov-11 7:22

You have code for a Windows application there. And it also looks like it is using MFC. You won't find a main(), nor will you need to. Odd, though is that you have 'theApp' declared twice. That's definitely not a good start.

There are methods of the CWinAppEx class that can be called in InitInstance to assist with command line handling. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]

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Re: Using Main to grab command line arguments if it doesn't already exist?

Chuck O'Toole23-Nov-11 7:43

Chuck O'Toole

23-Nov-11 7:43

As others have said, you either have main() or you have your WinApp (theApp) but not both. And definitely not two instantiations of theApp.

The command line arguments can be accessed during your InitInstance() function by looking at the m_lpCmdLine data member of your class.

There are a number of classes / functions that can help you parse it in the argc/argv style you're accustomed to, links are in earlier answers to this question.

Re: Using Main to grab command line arguments if it doesn't already exist?

Software_Developer23-Nov-11 7:52

Software_Developer

23-Nov-11 7:52

Look [here] for parsing C++ Command-Line Arguments in a console app's main. More [here] and [here].

Look [here] and [here] for parsing C++ Command-Line Arguments in MFC.
MSDN : [CWinApp::ParseCommandLine] and [CCommandLineInfo::CCommandLineInfo].

Re: Using Main to grab command line arguments if it doesn't already exist?

C^hris L^osinger23-Nov-11 8:41

C^hris L^osinger

23-Nov-11 8:41

in your CWinApp:InitInstance, you should be able to access the __argv and __argc variables.

image processing toolkits | batch image processing

Re: Using Main to grab command line arguments if it doesn't already exist?

Chuck O'Toole23-Nov-11 9:36

Chuck O'Toole

23-Nov-11 9:36

I did not know that, been tokenizing m_lpCmdLine myself. +5 for the info.

Bit Fielf In UML

Member 842679823-Nov-11 0:29

23-Nov-11 0:29

Hi ,

How can we represent structure bitfiled in the UML Model??

Re: Bit Fielf In UML

Software_Developer23-Nov-11 0:43

Software_Developer

23-Nov-11 0:43

Like [ this ].

Full article [ here ].

Member 842679823-Nov-11 1:13

23-Nov-11 1:13

If i have the following case,

Struct Mode
{

union
{
unsigned char MSB;
struct
{
unsigned char a:2
unsigned char b:3
unsigned char c:3

}

}

}

How to model the struct "Mode" in the class diagram?

Software_Developer23-Nov-11 3:24

Software_Developer

23-Nov-11 3:24

[ Here ] is a good UML primer.

C++

#include <iostream>
using namespace std;

/****************
*    class      *
*****************/

class c_Mode
{
public:
        union
        {
            unsigned char MSB;
            struct
            {
                unsigned char a:2;
                unsigned char b:3;
                unsigned char c:3;

            };

        };

} ;

/****************
*    struct     *
*****************/

struct s_Mode
{
public:
        union
        {
            unsigned char MSB;
            struct
            {
                unsigned char a:2;
                unsigned char b:3;
                unsigned char c:3;

            };

        };

} ;



int main()
{

    //  class
    c_Mode clsMode;
    clsMode.a=0;
    clsMode.MSB=0;

    //  struct
    s_Mode mode ;
    mode.a=0;
    mode.MSB=0;



    return 0;
}

Member 842679824-Nov-11 7:05

24-Nov-11 7:05

which model is correct for the above code??

http://s1209.photobucket.com/albums/cc395/phan-tom/[^]

modified 26-Nov-11 3:01am.

Member 842679825-Nov-11 21:23

Doesn't open heading file VC ++

25-Nov-11 21:23

The Link..
http://s1209.photobucket.com/albums/cc395/phan-tom/[^]

PeLeg8922-Nov-11 23:55

PeLeg89

22-Nov-11 23:55

People Hi!People, prompt why VC ++ doesn't open title files, can where it is necessary to adjust?
It is all to be in one folder, and doesn't want to open. Confused | :confused:

Richard MacCutchan23-Nov-11 0:04

Richard MacCutchan

23-Nov-11 0:04

Your question is not very clear, but if you are having trouble accessing files in your project then check that the location property is correct.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

PeLeg8923-Nov-11 0:14

PeLeg89

23-Nov-11 0:14

Ok! in my project there is two file-first main.cpp and main.h,and i am using command #nclude"main.h",But in the с++ editor the error that can't open this file Frown | :(

Both files are in one directory

Richard MacCutchan23-Nov-11 0:30

Richard MacCutchan

23-Nov-11 0:30

What do you mean "can't open"? If both files are in the correct directory then the editor will find them. You must have some other problem that is preventing it from locating the file. I presume the word "#nclude" above is a simple typo here only and not in your source file.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Erudite_Eric23-Nov-11 1:24

Erudite_Eric

23-Nov-11 1:24

PeLeg89 wrote:
#nclude

Try #include Smile | :)

==============================

Nothing to say.

Albert Holguin23-Nov-11 2:47

23-Nov-11 2:47

If your editor can't find a file, it means either:
0. File doesn't exist.
1. Path is not specified correctly in the include (if using entire path).
2. Path is not part of the project library/include directories (if using <>).
3. I believe I've also seen this occur if the file is not part of the project (although don't quote me on that one, don't quite remember)

PeLeg8923-Nov-11 2:56

PeLeg89

23-Nov-11 2:56

Thank all,you helped me Smile | :)

,I think this is 3 item

Albert Holguin23-Nov-11 3:32