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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 ) ;
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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?
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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?
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file=fopen(m_pathname1,"r");
with a lowercase 'r'
"640K ought to be enough for anybody."
Bill Gates
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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.
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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);
parList = page->GetList();
DoStuff();<br />
}<br />
van Padoea
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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
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Thank you,
Will try option 2 first.
van Padoea.
If every fool wore a crown, we would all be king - Lard
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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
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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.
Dominik
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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' 
Tomasz Sowinski -- http://www.shooltz.com
Free your mind and your ass will follow.
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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 Anyway since I wasn't sure I decided not to correct them
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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Nishant S wrote:
I have heard quite a few people refer to overloading as a kind of static polymorphism
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.
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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);
f(b); 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);
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.
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You're right. Alexandrescu, "Modern C++ Design", page 264
Tomasz Sowinski -- http://www.shooltz.com
Free your mind and your ass will follow.
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Thanks, Dominik pal!
Your reply has resolved all my doubts!
Cheers,
George
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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.
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Thanks, markkuk, my old friend!
Your reply has resolved all my doubts!
Cheers,
George
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I want to install hook to detect Win32 function called, eg. ::TextOut(). What type of hook I should use?
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This one on Codeguru rocks,
And I swallow a small raisin.
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Hello everyone!
My problem is as follows...
I've created a RichEditCtrl which contains text with various font sizes,
formatting and the total number of lines exceedes the visible window.
I want to calculate the number of visible lines that are in it.
I'd appriciate any suggestions....
Thanks
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Issue a resize message to the control like this:
DWORD dwEventMask=m_richedit_ayuda.GetEventMask();
dwEventMask|=ENM_REQUESTRESIZE;
m_richedit.SetEventMask(dwEventMask);
m_richedit.RequestResize(); Then, have EM_REQUESTRESIZE handled: there you are provided with the new size. It is up to you to do the actual resizing or not:
void CYourDlg::OnRichEditRequestResize(NMHDR* pNMHDR, LRESULT* pResult)
{
REQRESIZE *pReqResize = reinterpret_cast<REQRESIZE *>(pNMHDR);
CRect rect(pReqResize->rc);
m_richedit_ayuda.SetWindowPos(NULL,0,0,rect.Width(),rect.Height(),SWP_NOMOVE|SWP_NOZORDER);
*pResult = 0;
}
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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