Re: Tree control alignment - C / C++ / MFC Discussion Boards

Tomasz Sowinski30-Aug-02 0:37

30-Aug-02 0:37

Quick search on sourceForge(t) reveals this:

http://sourceforge.net/projects/mingw/[^]

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

load file in buffer

Brakanjan29-Aug-02 22:44

Brakanjan

29-Aug-02 22:44

hi
I'm new to C++ and would like to know how to load a file into a buffer. Is it something like
char *buf1 = fopen(??);
though that does not seem to work

thanks

Re: load file in buffer

jmkhael29-Aug-02 23:31

jmkhael

29-Aug-02 23:31

FILE * pf;
pf = fopen("C:\\File\\Path\\File.extension" , "R" );

if (pf) { // File well opened
// in order to read work on the fread function

}

if u want to use MFC see the CStdioFile or CFile class

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: load file in buffer

Brakanjan30-Aug-02 2:49

Brakanjan

30-Aug-02 2:49

tx for the reply.
pf (file in my case) unfortunately does change, but to 0, so the if function isn't entered. The file does exist, cuase I'm using the following code:

FILE *file;
CFileDialog cf(TRUE);

//Get Filename
if (cf.DoModal() == IDOK)
{
CString m_pathname1 = cf.GetPathName();
file=fopen(m_pathname1,"R");
}

if (file)
{
//does not enter here!!
}

what am I doing wrong?

Re: load file in buffer

Brakanjan30-Aug-02 2:56

Brakanjan

30-Aug-02 2:56

tx for the reply
pf (file in my case) unfortunately does change, but to 0, so the if function isn't entered. The file does exist, cuase I'm using the following code:

FILE *file;
CFileDialog cf(TRUE);

//Get Filename
if (cf.DoModal() == IDOK)
{
CString m_pathname1 = cf.GetPathName();
file=fopen(m_pathname1,"R");
}

if (file)
{
//does not enter here!!
}

what am I doing wrong?

Re: load file in buffer

pépé30-Aug-02 4:18

pépé

30-Aug-02 4:18

file=fopen(m_pathname1,"r");

with a lowercase 'r'

"640K ought to be enough for anybody."
Bill Gates

Tree control alignment

Anonymous29-Aug-02 22:40

Anonymous

29-Aug-02 22:40

I like to right align tree control. If you know any idea then please tell me. Actually i want to print tree items in Arabic and for this purpose i needed to change the alignment of tree control items. If you know any such sample application or method then please tell me.

Re: Tree control alignment

Tomasz Sowinski29-Aug-02 23:34

Tomasz Sowinski

29-Aug-02 23:34

I guess you should check WS_EX_LAYOUTRTL and SetProcessDefaultLayout. The following article has more information:

http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0499/multilangUnicode/multilangUnicode.htm[^]

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Access of PropertyPage members

Arjan Schouten29-Aug-02 22:39

Arjan Schouten

29-Aug-02 22:39

Hi,

I want to access member functions of my derived CPropertyPage
Classes from the PropertySheet in a for loop. The problem is that I don't how to get a pointer to the correct PropertyPage Class

I can do it like this

<br />
CParameterList parList;<br />
CMainPage* mainPage = GetPage(0);<br />
parList = mainPage->GetList();<br />
DoStuff();<br />
<br />
CDrivePage* drivePage = GetPage(1);<br />
parList = drivePage->GetList();<br />
DoStuff();<br />
<br />
and more<br />

But it would make more sence if I could do it in a loop

<br />
for (int i = 0 ; i < GetPageCount(); i++)<br />
{<br />
CParameterList parList;<br />
CPropertyPage* page = GetPage(i); // Now I can only access     members of the base class<br />
parList = page->GetList();                  // So this would not work <br />
DoStuff();<br />
}<br />

van Padoea

Re: Access of PropertyPage members

Pavel Klocek29-Aug-02 23:17

Pavel Klocek

29-Aug-02 23:17

1) You can use IsKindOf:

CPropertyPage* page = GetPage(i); <br />
if(page.IsKindOf(RUNTIME_CLASS(CMainPage))) ((CMainPage*)page)->GetList();

2) If you have GetList() methods in all your pages, you can derive your pages from a intermediate class which defines the GetList() method as virtual:

class CListPage:CPropertyPage<br />
{<br />
    virtual CParameterList GetList()=0;<br />
    ...<br />
}<br />
<br />
class CMainPage:CListPage<br />
{<br />
   virtual CParameterList GetList(){...}<br />
   ...<br />
}

Sonork 100.15206;PavelK

Re: Access of PropertyPage members

Arjan Schouten29-Aug-02 23:33

Arjan Schouten

29-Aug-02 23:33

Thank you,

Will try option 2 first.

van Padoea.

If every fool wore a crown, we would all be king - Lard

A question about a strange "extern" statement.

George Ma29-Aug-02 22:30

George Ma

29-Aug-02 22:30

Hi, everyone!

Take a look at the following source codes,

--------
#ifdef __cplusplus
extern "C" {
#endif
--------

In my experience, we can use function and variable after
the key word "extern", but what means "C" {
here?

Cheers,
George

Re: A question about a strange "extern" statement.

Dominik Reichl29-Aug-02 22:41

Dominik Reichl

29-Aug-02 22:41

This means that all following exported functions are in C style (and not C++, even if you are coding in C++).

If you declare something as C, you cannot use polymorphy (two functions with same name but different parameters). Every function has a unique name.

Using this declaration, you can use the DLL in Visual Basic or Pascal for example.

Big Grin | :-D

Dominik

Re: A question about a strange "extern" statement.

Tomasz Sowinski29-Aug-02 23:42

Tomasz Sowinski

29-Aug-02 23:42

Dominik Reichl wrote:
If you declare something as C, you cannot use polymorphy (two functions with same name but different parameters).

Actually, this C++ feature is called 'overloading', not 'polymorphism' Smile | :)

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Re: A question about a strange "extern" statement.

Nish Nishant29-Aug-02 23:42

Nish Nishant

29-Aug-02 23:42

Tomasz Sowinski wrote:
Actually, this C++ feature is called 'overloading', not 'polymorphism'

Yeah, but very curiously I have heard quite a few people refer to overloading as a kind of static polymorphism whereas the actual polymorphism is referred to as dynamic polymorphism. I thought it was some kinda Trivandrum thing Smile | :)

Anyway since I wasn't sure I decided not to correct them Smile | :)

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: A question about a strange "extern" statement.

Tomasz Sowinski29-Aug-02 23:51

Tomasz Sowinski

29-Aug-02 23:51

Nishant S wrote:
I have heard quite a few people refer to overloading as a kind of static polymorphism

Confused | :confused:

Strange - I don't know where they get this. Can you ask them for reference?

I believe there's a distinction between compile-time polymorphism (templates) and run-time polymorphism (inheritance/virtual functions).

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Re: A question about a strange "extern" statement.

Joaquín M López Muñoz30-Aug-02 0:47

Joaquín M López Muñoz

30-Aug-02 0:47

Alexandrescu says something of the sort somewhere in his book "Modern C++ Desisgn", if my memory serves me well.

If you think it over, the mechanism by which one or other overload of a given function is selected mimics polymorhpism in which it is the type of the objects involved that drives the selection of the right implementation:

class A{...};
class B:public A{...};
 
void f(A& a);
 
A a;
B b;
f(a); // uses f(A&);
f(b); // uses f(A&);

If now we define an additional overload things change:

class A{...};
class B:public A{...};
 
void f(A& a);
void f(B& b);
 
A a;
B b;
f(a); // uses f(A&);
f(b); // uses f(B&);

IMHO this is a very close compile-time equivalent to virtualness.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

PS: Anyway, I totally agree with you polymorphism is commonly used to refer to the run-time kind.

Re: A question about a strange "extern" statement.

Tomasz Sowinski30-Aug-02 0:54

Tomasz Sowinski

30-Aug-02 0:54

You're right. Alexandrescu, "Modern C++ Design", page 264 Smile | :)

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Re: A question about a strange "extern" statement.

Nish Nishant30-Aug-02 1:08

Nish Nishant

30-Aug-02 1:08

Wow Joaq. That was indeed useful infor Smile | :)

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: A question about a strange "extern" statement.

George Ma30-Aug-02 1:33

George Ma

30-Aug-02 1:33

Thanks, Dominik pal!

Your reply has resolved all my doubts!

Cheers,
George

Re: A question about a strange "extern" statement.

markkuk30-Aug-02 1:05

markkuk

30-Aug-02 1:05

This is used in header files that must be compatible with both C and C++. extern "C" tells the C++ compiler that anything inside the curly braces { } must be treated as C language declarations.

Re: A question about a strange "extern" statement.

George Ma30-Aug-02 1:34

George Ma

30-Aug-02 1:34

Thanks, markkuk, my old friend!

Your reply has resolved all my doubts!

Cheers,
George

How to hook Win32 function call?

sonshiro29-Aug-02 21:18

sonshiro

29-Aug-02 21:18

I want to install hook to detect Win32 function called, eg. ::TextOut(). What type of hook I should use?

Re: How to hook Win32 function call?

Joaquín M López Muñoz29-Aug-02 21:27

Joaquín M López Muñoz

29-Aug-02 21:27

PJ Naughter has it all packaged in his article HookImportFunctionByName v1.0
[^].

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: How to hook Win32 function call?

Stephane Rodriguez.29-Aug-02 22:22

Stephane Rodriguez.

29-Aug-02 22:22

This one on Codeguru rocks,

And I swallow a small raisin.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.