Compressing & Uncompressing of text file - C / C++ / MFC Discussion Boards

vikramlinux31-Jul-06 23:59

31-Jul-06 23:59

Hi Friends,
I have a question about RTTI.
1) In C++ we have vptr pointing to vtables which helps to make use of
pointer as polymorphic entities.
2) Without knowing object type I can call methods of object using
those pointers.
So in which case RTTI is needed? ( Why I need to know my object
type?) What is the use case?

Vikram S

Re: RTTI

toxcct1-Aug-06 0:36

toxcct

1-Aug-06 0:36

class CObject {}
 
class CCar : public CObject {}
 
class CBus : public CObject {}
 
class CBike : public CObject {}
 
std::vector<CObject> vecVehicles;

then, how do you know if the elements inserted in the vector are Cars, Buses or Bikes without RTTI ?

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: RTTI

ThatsAlok1-Aug-06 23:52

ThatsAlok

1-Aug-06 23:52

toxcct wrote:
then, how do you know if the elements inserted in the vector are Cars, Buses or Bikes without RTTI ?

Right!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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SQL Scripting in a Batch File

Programm3r31-Jul-06 23:55

Programm3r

31-Jul-06 23:55

Hi all,

I wrote a batch file, with I call from my VC program, but....

Well first of all, I would like to know if it is possible to put sql scripting in a batch file for execution?

I can connect to the MySql Server with a batch file but can't execute anymore commands (MySql command like reading from a file). I don't know how to do this, so If anyone could point me to a site or help me .... well just thanx in advance

Regards

Programm3r

Regards

Programm3r

Re: SQL Scripting in a Batch File

toxcct31-Jul-06 23:57

toxcct

31-Jul-06 23:57

this is more a question for the SQL forum[^] or even for the general questions forum

TOXCCT >>> GEII power

[VisualCalc 3.0 updated ][Flags Beginner's Guide new! ]

Re: SQL Scripting in a Batch File

Programm3r31-Jul-06 23:59

Programm3r

31-Jul-06 23:59

Thought so ..... my bad

Thanx anyway
Blush | :O

Regards

Programm3r

Re: SQL Scripting in a Batch File

David Crow1-Aug-06 3:16

David Crow

1-Aug-06 3:16

A batch (.bat) file is nothing more than a collection of commands that could just as easily be executed from a command prompt. That said, if you can issue the SQL commands from a command prompt, then you can also do such from a batch file.

"Money talks. When my money starts to talk, I get a bill to shut it up." - Frank

"Judge not by the eye but by the heart." - Native American Proverb

Compressing & Uncompressing of text file

Suresh H31-Jul-06 23:37

Suresh H

31-Jul-06 23:37

Hi,

I have one program which writes some text to a file, and save it and closes.
If we click on the file the contents can be read {text file}.

I want to know is there any way I can make a file unreadable when its opened from outside, I want to know to how to compress when file when it is closed and uncompressed when it is opened by the program.

Can u please give me some suggestions.

Thanking you,
Suresh H.

Re: Compressing & Uncompressing of text file

Marc Soleda1-Aug-06 0:12

Marc Soleda

1-Aug-06 0:12

Why don't you encrypt/decrypt it?

Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

Re: Compressing & Uncompressing of text file

Suresh H1-Aug-06 0:16

Suresh H

1-Aug-06 0:16

Hi, Thanks for the reply.

How to do that ??? can u please give me some suggestions and also along that i want to compress the file.

Re: Compressing & Uncompressing of text file

Marc Soleda1-Aug-06 0:58

Marc Soleda

1-Aug-06 0:58

You can find several in Criptography[^] category.

I have tested this one[^] and I think you could use it. All depends on the degree of security you need or if you just needs a first stop for a possible opener.

I hope it helps,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

Re: Compressing & Uncompressing of text file

Hamid_RT1-Aug-06 0:22

Hamid_RT

1-Aug-06 0:22

SeeZipper Component [^] maybe it is some helpful to you

WhiteSky

Re: Compressing & Uncompressing of text file

Suresh H1-Aug-06 0:43

Suresh H

1-Aug-06 0:43

Thank you very much for the link I will check it.

ActiveX function return pointer

majco33331-Jul-06 23:33

majco333

31-Jul-06 23:33

Hi,

I need create function which returned pointer

for example:

void* tmp;
return tmp

Can ActiveX returned pointer to the external application???
Because I don't know how do it.

Function in external apllication which used ActiveX is for e.:

InvokeHelper(0x11, DISPATCH_METHOD, VT_BOOL, (void*)&result, NULL);

instead VT_BOOL I need poiter variable...

Please help me...

GUI technologies [modified]

A_Fa31-Jul-06 23:33

A_Fa

31-Jul-06 23:33

Hi all friends .

Is any technology for developing graphics program (GUI programming) faster than DirectDraw ?

Thank in advance .

Re: GUI technologies

Hamid_RT1-Aug-06 0:22

Hamid_RT

1-Aug-06 0:22

What do you need?

WhiteSky

Re: GUI technologies

ThatsAlok1-Aug-06 23:52

ThatsAlok

1-Aug-06 23:52

A_Fa wrote:
Is any technology for developing graphics program (GUI programming) faster than DirectDraw ?

Is OpenGl is of any use? do you want to make game?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You

PrintPreview problem

mikobi31-Jul-06 23:28

mikobi

31-Jul-06 23:28

Dear Sir,
I still have difficult to do printPreview.

I need to do printPreview without doc/view facilities , to preview more than one pages.
And I can have more than one dialogs to preview.

Who can help me?

Re: PrintPreview problem

Christopher Stratmann31-Jul-06 23:58

Christopher Stratmann

31-Jul-06 23:58

This is what I used. I first got printing to work without the doc/view architecture. Check this out. http://www.codeproject.com/printing/printing_wo_docview.asp[^] After that I moved on to the print preview. I used this....http://www.codeproject.com/printing/printextension.asp[^] As you can see on this last web page are a couple of comments at the bottom of the web page of the troubles and fixes which I have encountered.

Chris

Re: PrintPreview problem

mikobi1-Aug-06 1:39

mikobi

1-Aug-06 1:39

I go directly to the printpreview adresse.
After doing all, I have this message on #include "PrintExtension.h";
fatal error C1083: Cannot open include file: 'PrintExtension.h': No such file or directory

What to do ?

Re: PrintPreview problem

Hamid_RT1-Aug-06 2:37

Hamid_RT

1-Aug-06 2:37

check you have this file and check path from this file is correct

WhiteSky

Re: PrintPreview problem

mikobi1-Aug-06 2:43

mikobi

1-Aug-06 2:43

Whar is true is that this fine don't exist, we have only *.lib and *.dll that I put thoses in the program path and c:\windows\system32, but still have the same error

Re: PrintPreview problem

mikobi1-Aug-06 3:11

mikobi

1-Aug-06 3:11

From the demo example copy this file to my path but i have this message:
C:\backupmik\research\help\dialogpreview.cpp(16) : error C2039: 'classCPrintPreviewDialog' : is not a member of 'CPrintPreviewDialog'

I don't understank because this file I copy it like that from the dem project.

Re: PrintPreview problem

Hamid_RT1-Aug-06 5:09

Hamid_RT

1-Aug-06 5:09

error C2039: 'classCPrintPreviewDialog' : is not a member of 'CPrintPreviewDialog'
maybe you need to include a file(header) that has CPrintPreviewDialog

WhiteSky

Re: PrintPreview problem

mikobi4-Aug-06 6:18

mikobi

4-Aug-06 6:18

Thanks to all for your help.

I did'nt reply soon because I have problems with my provider.

I try all ideas we have sended me and I have a good result.

Thanks to all again.

Last Visit: 31-Dec-99 18:00 Last Update: 3-May-24 0:00

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