C / C++ / MFC

26-Oct-09 9:40

in the name of god
hello anyone who is reading
i have a problem please help me:
in the code below is there any way which the class DerivedContainer in every where treat with DrivedMember as m_instance without static_cast?
as i have no well access to net if it is possible please send me the answer to sajadsadeghy@gmail.com or if not also thanks.

#include "stdafx.h"

class BaseMember
{
public:
int testBase;
BaseMember()
{

}

};
class DerivedMemer:public BaseMember
{

public:
DerivedMemer()
{

}
void SomeFunction()
{

}
int testDerived;

};

class BaseContainer
{
public:
BaseMember* m_instance;
BaseContainer()
{
m_instance=new BaseMember();
}

};
class DerivedContainer:public BaseContainer
{
public:
DerivedContainer()
{
m_instance=new DerivedMemer();
}
void TestFunction()
{
DerivedMemer* pIs=static_cast(this->m_instance);
pIs->testDerived=100;

}
};

int _tmain(int argc, _TCHAR* argv[])
{
DerivedContainer der;
der.TestFunction();
return 0;
}

thanks in advance .
valhamdolelah

David Crow26-Oct-09 9:54

26-Oct-09 9:54

khomeyni wrote:
DerivedMemer* pIs=static_cast(this->m_instance);

This does not compile. Try:

DerivedMemer *pIs = static_cast<DerivedMemer *>(this->m_instance);

You could also use:

DerivedMemer *pIs = (DerivedMemer *) this->m_instance;

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"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

khomeyni27-Oct-09 6:19

27-Oct-09 6:19

in the name of god
hello and thanks for your guide
but my question is that every time we need the m_instance of class DrivedContainer we must use TestFunction as in the main belowthat it is not good way to do this in every initializing;
is there any way to avoid writing TestFunction and casting the m_instance to DrivedMember class object?

void TestFunction()
{
DerivedMemer *pIs = static_cast<derivedmemer *="">(this->m_instance);
pIs->testDerived=100;
}

int main(int argc, _TCHAR* argv[])
{
DerivedContainer der;
der.TestFunction();
return 0;
}

thanks
valhamdolelah

David Crow27-Oct-09 6:30

27-Oct-09 6:30

khomeyni wrote:
...every time we need the m_instance of class DrivedContainer...

From where? It can be accessed from another method in DerivedContainer, and in main().

How are you wanting to get access to m_instance?

khomeyni27-Oct-09 6:56

27-Oct-09 6:56

in main i used :

DerivedContainer der;
der.TestFunction();

i mean that every time i create a new object of DrivedContainer i must cast m_instance of class DrivedContainer which has been inherited from BaseContainer to DrivedContainer.

class BaseContainer
{
public:
BaseMember* m_instance;
BaseContainer()
{
m_instance=new BaseMember();
}

};

int main(int argc, _TCHAR* argv[])
{
DerivedContainer der;
der.TestFunction();
}

you said there is another way for this. please say what i must to do?

valhamdolelah

David Crow27-Oct-09 7:36

27-Oct-09 7:36

khomeyni wrote:
you said there is another way for this. please say what i must to do?

I've not sure if it is the correct way, but one option would be:

class BaseContainer
{
public:
    BaseMember *m_instance;
    
    BaseContainer()
    {
        m_instance = new BaseMember();
    }
    
    BaseContainer( DerivedMemer *d )
    {
        m_instance = d;
    }
};
  
class DerivedContainer : public BaseContainer
{
public:
    DerivedContainer() : BaseContainer( new DerivedMemer )
    {
    }
};
  
void main( void )
{
    DerivedContainer der;
    BaseContainer bas;
}

This is a part of C++ that I've never had to bother/worry about.

khomeyni28-Oct-09 20:54

28-Oct-09 20:54

in the name of god
hello and thanks for your guide
but suppose that i want to create a function in DerivedContainer and use m_instance there then it is false for it and yet we must cast for each object.

example:

class DerivedContainer : public BaseContainer
{
public:
DerivedContainer() : BaseContainer( new DerivedMemer )
{
}
mynew_fun(){//here we need type_cast yet.
DerivedMember *nD=static_cast<derivedmember *=""> (this->m_instance);
}
};

Thread buttons

Nikz226-Oct-09 6:37

Nikz2

26-Oct-09 6:37

Hi. Sry to bother. I am creating some buttons in a UI-thread. And they creats just fine. Unique thing that bothers me, is that they don't draw itselfs. So i can use them, but i can't see them. I am using gdiplus to draw the buttons. I start it at the application thread. (i don't know if i should start it at my own thread too? and if i do it, sometimes the application doesn't starts, but doesn't matter the problem persists) So what could i do to make visible my buttons? (they have visible style and showwindow sw_show etc) (when i do this without thread it all looks fine) And other problem that i noticed, when the application is closed it calls the destructor of buttons created by my thread, so it raise exception. So.. can you help me? =) Tnx for any help.

Re: Thread buttons

David Crow26-Oct-09 6:45

how to convert tiff to pdf it's urgent

26-Oct-09 6:45

Why not create the buttons in the primary thread?

Re: Thread buttons

Nikz226-Oct-09 7:26

Nikz2

26-Oct-09 7:26

Well.. It's complicated. It's not a simple button... That's why i tryed to do it in a thread, but i followed your idea and made instead of CreateButton(...) PostMessage(...) and it works. But i have certain troubles with it. For example i create one button, later other that have to works with previously created button. So how can i check that the message stack is empty?

eswar pothula26-Oct-09 5:23

eswar pothula

26-Oct-09 5:23

Hi all........
This is Eswar

I want help for any one, In my project convert from tiff image to pdf document. this project developed in vc++6.0, :

so please help me........ Frown | :(

thanks in advance

CPallini26-Oct-09 5:41

CPallini

26-Oct-09 5:41

May I politely google that for you [^]?
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]

David Crow26-Oct-09 6:04

26-Oct-09 6:04

eswar pothula wrote:
so please help me........

Consider yourself helped:

http://www.lmgtfy.com/?q=how+convert+tiff+to+pdf[^]

image processing toolkits | batch image processing

C^hris L^osinger26-Oct-09 11:10

C^hris L^osinger

26-Oct-09 11:10

get LibTiff. it includes a Tiff2Pdf utility.

http://www.remotesensing.org/libtiff/[^]

Hariharasudhan R26-Oct-09 16:10

Hariharasudhan R

26-Oct-09 16:10

Maybe this can help :
Convert Tiff To Pdf[^]

or

http://download.cnet.com/TIFF-to-PDF-API-Library/3000-2070_4-10488425.html[^]

Unicode problem

m_mun26-Oct-09 4:12

m_mun

26-Oct-09 4:12

Hi all,
I want to display a special font using UNICODE, in my MFC application.
I have used '_UNICODE' in preprocessor.
This is my syntax

TCHAR **strUnicode;
//...
wcscpy(strUnicode[0],L"U+0985"); //Bengali unicode of a single charecter

After that, i want to display bengali character by print value of 'strUnicode'. But it display 'U+0985'.

Can any one told me how to construct 'strUnicode' and to display charecter.

Thanks to all

Hristo-Bojilov26-Oct-09 4:25

Hristo-Bojilov

26-Oct-09 4:25

Try using something like that:

std::wstring str = L"Special letters: \u0985";
MessageBox(NULL,str.c_str(),L"Caption",MB_OK);

Life is a stage and we are all actors!

Nemanja Trifunovic26-Oct-09 4:34

26-Oct-09 4:34

Almost

std::wstring str = L"Special letters: \x0985";
MessageBox(NULL,str.c_str(),L"Caption",MB_OK);

utf8-cpp

Re: Unicode problem [modified]

Hristo-Bojilov26-Oct-09 4:58

Hristo-Bojilov

26-Oct-09 4:58

Is there any difference between \x20AC and \u20AC for example ?
Characters size or code page issues or other?
I've thought they display exactly the same and wcscmp confirmed that produced strings are identical.

Life is a stage and we are all actors!

Nemanja Trifunovic26-Oct-09 5:25

26-Oct-09 5:25

Hristo Bojilov wrote:
Is there any difference between \x20AC and \u20AC for example ?

The former is a character escape for a hex number - the later is not a valid C/C++ escape character[^].

[EDIT] But MS VC++ happily compiled it - apparently, a MS-specific extension [^]: "If a backslash precedes a character that does not appear in the table, the compiler handles the undefined character as the character itself. For example, \c is treated as an c."

Funny Smile | :)

[/EDIT]

utf8-cpp

modified on Monday, October 26, 2009 11:34 AM

David Crow26-Oct-09 6:08

26-Oct-09 6:08

Nemanja Trifunovic wrote:
But MS VC++ happily compiled it...

I got C4129 from VS6.

Nemanja Trifunovic26-Oct-09 6:30

Universal character names

26-Oct-09 6:30

DavidCrow wrote:
I got C4129 from VS6

So we found a case where VC6 is more standard-compliant than VC10 Beta 2 Smile | :)

utf8-cpp

Nemanja Trifunovic26-Oct-09 7:43