C / C++ / MFC

David Crow10-Sep-12 2:38

David Crow

10-Sep-12 2:38

sunilkpv wrote:
Because the CHttpFile->Read function doesn't exit if the connection isn't lost.

Are you saying that it should exit if the connection is not lost?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

Sunil P V10-Sep-12 19:04

Sunil P V

10-Sep-12 19:04

Sorry. That was a typo. What you said is right. I found a solution for this by setting a timeout using the CInternetSession class.

However I have ended up with another similar problem. I am reading a file over the network drive using CFIle class. Now if the network drive access is lost (due to any reason) can we get to know this. The read() function continues without breaking. How can this be solved?? Please help...

Sunil

_Flaviu10-Sep-12 21:01

_Flaviu

10-Sep-12 21:01

I give some code :

C++

BOOL CYourDoc::DownloadFile(CString sAddress, CString& sResult)
{
	CString sTemp;
	BOOL bRet = FALSE;
	CInternetSession ISession;
	CInternetFile* pIFile = NULL;
	CMainFrame* pFrame = (CMainFrame*)AfxGetMainWnd();

	try
	{
		pIFile = (CInternetFile*)ISession.OpenURL(sAddress);
		while(pIFile->ReadString(sTemp))sResult += sTemp;
		bRet = TRUE;
	}
	catch(CException* pException)
	{
		pException->GetErrorMessage(sTemp.GetBuffer(255),255);
		sTemp.ReleaseBuffer();
		pException->Delete();
		pFrame->SetMessageText(sTemp);
	}

	if(pIFile)
	{
		pIFile->Close();
		delete pIFile;
	}

	ISession.Close();

	return bRet;
}

I this code, when something happened, throw an exception, there you can do whatever you want ... I hope this help you ...

How to set Image' Document Size ?

David Crow11-Sep-12 3:06

David Crow

11-Sep-12 3:06

sunilkpv wrote:
The read() function continues without breaking.

What is it continuing doing? Reading what? What does your read loop look like?

002comp9-Sep-12 22:18

002comp

9-Sep-12 22:18

Hello Friends

I am creating a application in which I am saving a image as bmp using BITMAPINFOHEADER.
But this structure' height/Width variable is saving image size in Pixels and that i coming fine If i check in Photoshop. But Its Document size[height and width in inches] is not coming fine.As its resolution is by default 72.
And then this Document size is not matching up with mine application ht/width in inches.

Is there any other member varible of BITMAPINFOHEADER structure where I can directly set image size[ht/wd] in inches?

Or any other way So that i can get actual size of image If i open it in some image viewer?

Regards
Yogesh Sikri

Re: How to set Image' Document Size ?

pasztorpisti9-Sep-12 23:10

Re: How to set Image' Document Size ?

9-Sep-12 23:10

Check out the biXPelsPerMeter and biYPelsPerMeter members that are in pixels/meter units: BITMAPINFOHEADER[^].

002comp9-Sep-12 23:32

002comp

9-Sep-12 23:32

Now,I setted it value to 0x0ec4. and Image size in Inches are coming fine when I look in photoshop. Thanks A Lot.
But,its coming fine for bmp and tiff.For tga ,its coming default res 72.
Any Idea?

Regards
Yogesh

Re: How to set Image' Document Size ?

C^hris L^osinger10-Sep-12 1:11

C^hris L^osinger

10-Sep-12 1:11

as far as i know, the TGA format does not provide a method of storing DPI info.

image processing toolkits | batch image processing

Highlighting some text in CEdit

Hadi Dayvary9-Sep-12 21:57

Hadi Dayvary

9-Sep-12 21:57

Hi What is the best way to create an edit box (derived from CEdit) that can draw a red line under wrong words for example. and then user can right click on it and correct it from a sugested menu list. (Like what visual assist does in Visual Studio)

Doing it insdie OnPaint() is not easy because we must take care of single or multi line, and maybe some other thing.

An example or project will help a lot.

Regards
Hadi

www.logicsims.ir

Re: Highlighting some text in CEdit

_Flaviu10-Sep-12 19:31

_Flaviu

10-Sep-12 19:31

Have you think to use CRichEditCtrl instead of CEdit ?

Re: Highlighting some text in CEdit

Hadi Dayvary10-Sep-12 22:33

Hadi Dayvary

10-Sep-12 22:33

Hi Thanks
It seems everything will be more dificult with CRichEdit
I found this project:
Spell Checking Edit Control (Using HunSpell)[^]

www.logicsims.ir

NON-SCALAR TYPE CONVERSION!?

Jorgmen9-Sep-12 8:58

Jorgmen

9-Sep-12 8:58

Sorry you all for bothering on Sunday:
I'm new using C++ and I need to simulate a Social network, but I'm having troubles doing a "member": this
is the code is very simple:

I hava a header called "structs.h"

struct Miembro{
int id;
int activo;
int pass;

Miembro(int a, int b, int c)
{
id = a;
activo = b;
pass = c;
}
};

//******************************
//Main is like:

#include <cstdlib>
#include <iostream>
#include <string>
#include "structs.h"

using namespace std;

int main(void)
{
	
cout<< "hola";

string nombre;
nombre = "Jorge";
cout <<"  "<< nombre << endl;
	
Miembro memb = new Miembro(1, 1, 123);


	
//	system("pause");
//	return 0;
}

F:\main.cpp In function 'int main()':
17 37 F:\main.cpp [Error] conversion from 'Miembro*' to non-scalar type 'Miembro' requested
F:\Makefile.win [Error] [main.o] Error 1 (if this is the only error: please check your library includes)

jorgmen

enhzflep9-Sep-12 9:40

enhzflep

9-Sep-12 9:40

Because you're creating a new Miembro in this way, all you get back is a pointer to it. You then try to assign this pointer to an object of type Miembro.

Just change it to this:

C++

Miembro *memb = new Miembro(1,1,123);

Make it work. Then do it better - Andrei Straut

pasztorpisti9-Sep-12 9:52

9-Sep-12 9:52

OR, you can just say

C++

Miembro memb(1, 1, 123);

and this will allocate the memb object on the stack. I think this is the recommended way to allocate small objects whenver possible. Objects allocated on the stack are deleted automatically for you when they run out of scope (usually at the end of your function or if-block or whatever). If you allocate an object from the heap then you get a pointer to the heap and you must delete that object via its pointer when you done with it using the delete keyword. By forgetting to delete heap objects your program might continuously 'eat' the memory until you exit the program (this memory waste is called 'memory leak').

Jorgmen9-Sep-12 10:52

Jorgmen

9-Sep-12 10:52

Thaks for your replays:
now i have a new q?

C++

struct Miembro{
int id;
int activo;
int pass;

Miembro(int a, int b, int c)
{
id = a;
activo = b;
pass = c;
}
};

struct NodoMiembro{
NodoMiembro * nextmiem;
NodoMiembro * prevmiem;
Miembro persona;

NodoMiembro(Miembro nuevo){
nextmiem = prevmiem = NULL;
persona = nuevo;
}
};

struct ListaMiembros{
NodoMiembro * lastmember;
NodoMiembro * firstmember;

ListaMiembros(){
lastmember = firstmember = NULL;

}

I can't compile this, I'm having headache because of c++: it says:

4 0 F:\main.cpp In file included from main.cpp
F:\structs.h In constructor 'NodoMiembro::NodoMiembro(Miembro)':

31 27 F:\structs.h [Error] no matching function for call to 'Miembro::Miembro()'

31 27 F:\structs.h [Error] candidates are:

17 1 F:\structs.h Miembro::Miembro(int, int, int)

17 1 F:\structs.h candidate expects 3 arguments, 0 provided

12 8 F:\structs.h Miembro::Miembro(const Miembro&)

12 8 F:\structs.h candidate expects 1 argument, 0 provided

F:\structs.h At global scope:

WHY NodoMiembro can't have a "Miembro xxx" as parameter in the constructor???

enhzflep9-Sep-12 12:33

enhzflep

9-Sep-12 12:33

Ooo-ouch!

Those warning messages are pretty nasty. They offered me no help at all in solving the problem. At first I thought it may be a result of being structs, rather than classes - no, of course not. Default access is public instead of private, but it did then get me thinking.

I was writing out the constructors when the idea of default constructors hit me in the face..

Notice in your NodoMiembro definition, you have a variable of type Miembro? Well, have a close look at the way it's defined - It's just Miembro persona;

Just back-up a bit and think what would happen if you tried to instantiate the struct like this in your main() - it would fail miserably.

Here:

C++

#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

struct Miembro
{
    int id;
    int activo;
    int pass;

    Miembro(int a, int b, int c)
    {
        id = a;
        activo = b;
        pass = c;
    }
};
int main(void)
{
    Miembro a;
}

Basically, the fix is to add default constructors to both the the Miembro and the NodoMiembro structs.

C++

Miembro()
{
    id=activo=pass=0;
}

and

C++

NodoMiembro()
{
    nextmiem = prevmiem = NULL;
}

Make it work. Then do it better - Andrei Straut

Chuck O'Toole9-Sep-12 12:39

Chuck O'Toole

9-Sep-12 12:39

The declaration

Miembro persona;

is the same as saying

Miembro persona();

(constructor with 0 arguments) but the only constructor you defined requires 3 arguments

Miembro(int a, int b, int c)

so the compiler cannot resolve the reference.

pasztorpisti9-Sep-12 14:07

9-Sep-12 14:07

Chuck O'Toole wrote:
Miembro persona;
is the same as saying
Miembro persona();

Just want to mention an exotic exception: If Miembro was a POD type then the two statements had different effects. The first wouldn't initialize the variable while the second would zero initialize. PODs are primitive types - ints, bools, etc... and structs/classes without any explicitly declared constructors/destructor/virtual methods (briefly: C-struct compatible stuff).

pasztorpisti9-Sep-12 14:09

9-Sep-12 14:09

Jorgmen wrote:
Sorry you all for bothering on Sunday

Those who don't want to be bothered simply don't login on sunday... Smile | :)