Re: System(pause) - C / C++ / MFC Discussion Boards

Re: System(pause)

Cedric Moonen22-Jul-08 22:27

Cedric Moonen

22-Jul-08 22:27

T.RATHA KRISHNAN wrote:
The application closes without any notice.

If the application crashes, nothing will be able to show the console window (your code won't be executed because your application crashed). Instead, try to debug your application using the debugger, it is much more powerfull than what you could print in the console.

Cédric Moonen
Software developer

Charting control [v1.4]
OpenGL game tutorial in C++

Re: System(pause)

T.RATHA KRISHNAN22-Jul-08 22:42

T.RATHA KRISHNAN

22-Jul-08 22:42

Sorry!
I don't know how to find at which point the crash occurs? Can u please explain?

Re: System(pause)

CPallini22-Jul-08 22:58

CPallini

22-Jul-08 22:58

What about a look at documentation [^].
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: System(pause)

Rajesh R Subramanian1-Aug-08 20:41

Rajesh R Subramanian

1-Aug-08 20:41

This is upsetting. I want your opinion and support here, pal:

http://www.codeproject.com/script/Forums/View.aspx?fid=2605&msg=2661564[^]

Please leave us our small pleasures, they are small, but they are ours! - Mycroft Holmes ^

.·´¯`·->Rajesh<-·´¯`·.
[Microsoft MVP - Visual C++]

Re: System(pause)

David Crow23-Jul-08 3:35

David Crow

23-Jul-08 3:35

Cedric Moonen wrote:
If the application crashes...

What crash?

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: System(pause)

Cedric Moonen23-Jul-08 4:24

Cedric Moonen

23-Jul-08 4:24

That's why I said if Smile | :)

. That was a guess from the symptoms if was describing: the application closes without notice and even puttin a system("pause") doesn't stop the windo to close. Sounds very close to a crash to me.
Anyway, using the debugger for such purpose (even if the application doesn't crash) brings much more info than trying to output text on the console trying to guess what is happening.

Cédric Moonen
Software developer

Charting control [v1.4]
OpenGL game tutorial in C++

Re: System(pause)

David Crow23-Jul-08 4:57

David Crow

23-Jul-08 4:57

Cedric Moonen wrote:
...and even puttin a system("pause") doesn't stop the windo to close.

Most likely because LOG_INFO() and the subsequent call to system() are operating on two different command prompt windows. I don't see any way for the OP's current design to work.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: System(pause)

Rajesh R Subramanian22-Jul-08 23:23

Rajesh R Subramanian

22-Jul-08 23:23

T.RATHA KRISHNAN wrote:
system("PAUSE");

Why do you have to call system("pause")? It is a very resource expensive call and is still not the fastest thing in the world. Can't you just use getch() or something else similar?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Re: System(pause)

T.RATHA KRISHNAN22-Jul-08 23:37

T.RATHA KRISHNAN

22-Jul-08 23:37

Rajesh R Subramanian wrote:
Can't you just use getch() or something else similar?

I've used getchar(). But i didn't get the result. i.e I could not see my console's contents.(It doesn't pause). What else to do?

Re: System(pause)

Rajesh R Subramanian22-Jul-08 23:39

Rajesh R Subramanian

22-Jul-08 23:39

Is it C or C++? If it is C++, how about std::cin.get()?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Re: System(pause)

T.RATHA KRISHNAN22-Jul-08 23:45

T.RATHA KRISHNAN

22-Jul-08 23:45

Rajesh R Subramanian wrote:
If it is C++, how about std::cin.get()?

It's C++ only. I've just tested with this also(std::cin.get()). But I didn't get the result. Moreover, the output window displays "Native' has exited with code 3 (0x3)". Not the first time. When I try to use "system("PAUSE");", it displays the same message.

Re: System(pause)

Rajesh R Subramanian22-Jul-08 23:47

Rajesh R Subramanian

22-Jul-08 23:47

We're diggin' a deep hole. Let me ask you, What does "didn't get the result" mean? What are you expecting to achieve with system("pause")?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Re: System(pause)

T.RATHA KRISHNAN22-Jul-08 23:53

T.RATHA KRISHNAN

22-Jul-08 23:53

Rajesh R Subramanian wrote:
What are you expecting to achieve with system("pause")?

My application is running and it closes with out any notice. I want to display one message to the console before it closes. So I used system("PAUSE") command. It didn't work. What else to do?

Re: System(pause)

Cedric Moonen23-Jul-08 0:09

Cedric Moonen

23-Jul-08 0:09

As I already told you, if your application crashes you can't display anything in the console anymore. Why don't you learn to use your debugger properly ? It will save you a lot of time and headaches in the future and it is not very difficult to use.
To begin, simply press F5 to start your debugger. Normally, it will already point you to the crash location. You can still put breakpoints in your code (F9) to see the evolution.
Why not just experiment a bit with it ? It won't kill your PC and you will learn much more doing that than asking questions in a forum.

Cédric Moonen
Software developer

Charting control [v1.4]
OpenGL game tutorial in C++

Re: System(pause)

Rajesh R Subramanian23-Jul-08 0:36

Rajesh R Subramanian

23-Jul-08 0:36

At first, the system("pause") caught my attention and therefore I replied. Now, you simply cannot output something "after" your program has crashed, because it is already dead. No matter what you do.

Please use the debugger, as Cedric already said.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.

Microsoft MVP - Visual C++[^]

Re: System(pause)

David Crow23-Jul-08 3:37

David Crow

23-Jul-08 3:37

Try executing this code from outside of the IDE, with a command prompt window already open.

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Convert BSTR to Const char*

manju#12322-Jul-08 21:40

manju#123

22-Jul-08 21:40

Hi all..

As i am new c# .net......I have created a structure in Dll and calling that DLL in vc++ console Application....
I am getting the structure variable in my console application...

when i put printf..I am able to see the values..
but when i save it in a text file i am getting buffer value ..

Actually i am trying with code..

<br />
const _TCHAR *elementName[100];<br />
const _TCHAR *elementValue[100];<br />
Sharepoint_API::StructGetSite HUGEP *pBSTR;	<br />
	hr = SafeArrayAccessData(pICalc->GetData, (void HUGEP* FAR*)&pBSTR);	<br />
	for(i=0; i<pBSTR[0].totAttribute; i++){<br />
		elementName [i] = "NAME";<br />
		elementValue[i] = (LPCTSTR)pBSTR[i].Atrribute;		<br />
		printf("%d. is  %S \n", i+1, elementValue[i]);<br />
		ofstream TestFile("E:\\Test.txt",ios::app);<br />
		if(TestFile) <br />
		{<br />
			TestFile<<elementValue[i];//"dd";//elementValue[i];<br />
		}<br />
		else if(!TestFile) <br />
		{<br />
		}<br />
		TestFile.close();

In printf I am getting the correct value...

but in text file i am getting "h"

pBSTR[0].totAttribute is the total count i am getting from structure from dll

thank you....very much..

manju

Hi..
I am Mnaju.I have Completed my B.E Computers Science.Lokking for a job.I am interested in VC++
manju

Re: Convert BSTR to Const char*

CPallini22-Jul-08 22:27

CPallini

22-Jul-08 22:27

Probably you've to replace

TestFile << elementValue[i];

with

TestFile.write( (const char*) elementValue[i], _tcslen(elementValue[i])*sizeof(TCHAR));

since even a wostream would not do the trick.

Smile | :)

Re: Convert BSTR to Const char*

manju#12322-Jul-08 22:51

manju#123

22-Jul-08 22:51

Sorry sir...
not working..
yet the same result..
I am getting output as

hhhhh

Hi..
I am Mnaju.I have Completed my B.E Computers Science.Lokking for a job.I am interested in VC++
manju

Re: Convert BSTR to Const char*

CPallini22-Jul-08 23:26

CPallini

22-Jul-08 23:26

What's the input, instead?

Re: Convert BSTR to Const char*

manju#12322-Jul-08 23:32

manju#123

22-Jul-08 23:32

CPallini wrote:
What's the input, instead?

Actually i will get the sharepoint folders which are stored in structures in the dll...
Actually i must get

/////////////////////////////
http://sharepoint/Docs
http://sharepoint/News
http://sharepoint/Reports
http://sharepoint/SearchCenter
http://sharepoint/SiteDirectory

/////////////////////////////
when i put printf

i.e printf("%d. is %S \n", i+1, elementValue[i]);

I am getting the value for elementValue[i]

Hi..
I am Mnaju.I have Completed my B.E Computers Science.Lokking for a job.I am interested in VC++
manju

Re: Convert BSTR to Const char*

CPallini23-Jul-08 0:11

CPallini

23-Jul-08 0:11

If you need to write a UNICODE file the code I provided works fine but you have to put the proper BOM at the very start of the file, for instance

  TCHAR * szIn = _T("http://sharepoint/Docs");
  ofstream of("foo.txt", ios::out);
#ifdef _UNICODE
  TCHAR BOM = 0xFEFF;
  of.write((const char *) &BOM, sizeof(TCHAR));
#endif
  of.write((const char *) szIn, _tcslen(szIn)* sizeof(TCHAR));
  of.close();

On the other hand, if you need to write a ANSI file then follow Naveen suggestion: use wofstream instead of ofstream.

Re: Convert BSTR to Const char*

Rajesh R Subramanian30-Jul-08 23:00

Rajesh R Subramanian

30-Jul-08 23:00

Please leave us our small pleasures, they are small, but they are ours! - Mycroft Holmes ^

.·´¯`·->Rajesh<-·´¯`·.
Microsoft MVP - Visual C++[^]

CPallini30-Jul-08 23:21

CPallini

30-Jul-08 23:21

Rajesh R Subramanian wrote:
[Suspicious]

Re: ?

Rajesh R Subramanian30-Jul-08 23:25

Rajesh R Subramanian

30-Jul-08 23:25

Hint: That's just not an emoticon, it is a hyperlink, in my previous post.

A post of mine is downvoted for no good reason (IMHO) in that thread. So, superhero intervention needed.

Please leave us our small pleasures, they are small, but they are ours! - Mycroft Holmes ^

.·´¯`·->Rajesh<-·´¯`·.
Microsoft MVP - Visual C++[^]

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