C / C++ / MFC

AbhishekBK wrote:

what is SOMEFILE_H ?

#ifndef AbhishekBK
#define AbhishekBK 
...
#endif

"The largest fire starts but with the smallest spark." - David Crow

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

moodsey211 wrote:

For example the #include statement is a preprocessor command that tells the compiler to include first the file...

"The largest fire starts but with the smallest spark." - David Crow

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

Parent.h :
 
<font color=blue>class</font> CParent {
    <font color=green>//...</font>
};

Child.h :
 
<font color=blue>#include</font> <font color=gray>"Parent.h"</font>    <font color=green>// needed for inheritence purpose</font>
 
<font color=blue>class</font> CChild : <font color=blue>public</font> CParent {
    <font color=green>//...</font>
};

main .cpp :
 
<font color=blue>#include</font> <font color=gray>"Parent.h"</font>
<font color=blue>#include</font> <font color=gray>"Child.h"</font>
 
<font color=blue>void main</font> (<font color=blue>void</font>) {
}

<font color=green>//Including the Parent.h requested in the original main.cpp...</font>
<font color=blue>class</font> CParent {
    <font color=green>//...</font>
};
 
<font color=green>//Including the Child.h requested in the original main.cpp...</font>
<font color=green>//...so also including the Parent.h requested in Child.h...</font>
<font color=blue>class</font> CParent {
    <font color=green>//...</font>
};
<font color=blue>class</font> CChild : <font color=blue>public</font> CParent {
    <font color=green>//...</font>
};
 
<font color=blue>void main</font> (<font color=blue>void</font>) {
}

toxcct wrote:

#ifndef tells the preprocessor to test if the macro is not defined.
if if is not, then the preprocessor #defines it and executes the body of the #if/#endif bloc.

#ifndef _MYFILE_H_
#define _MYFILE_H_

Stephen Hewitt wrote:

This isn’t the case, if the macro isn’t defined the body is executed but the macro isn’t #defined

m_Button.ModifyStyle(0,BS_OWNERDRAW); //in your main class insert this code
m_Button is CMyButton1
//////////////////

///////////in header file
class CMyButton1 : public CButton
{
	DECLARE_DYNAMIC(CMyButton1)

public:
	CMyButton1();
	virtual ~CMyButton1();
protected:
	DECLARE_MESSAGE_MAP()
public:
	virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
};


IMPLEMENT_DYNAMIC(CMyButton1, CButton)
CMyButton1::CMyButton1()
{
}

CMyButton1::~CMyButton1()
{
}


BEGIN_MESSAGE_MAP(CMyButton1, CButton)
	
END_MESSAGE_MAP()

void CMyButton1::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CDC dc;
dc.Attach(lpDrawItemStruct->hDC);
CRect rt;
rt = lpDrawItemStruct->rcItem;


dc.SetBkMode(0);

CString str;
GetWindowText(str);

if ( (lpDrawItemStruct->itemState & ODS_SELECTED) )
{
dc.FrameRect(&rt,&CBrush(RGB(110,170,210)));
dc.SetTextColor(RGB(0,0,0));
dc.FillRect(&rt,&CBrush(RGB(190,210,210)));
}
else
{
dc.FrameRect(&rt,&CBrush(RGB(0,0,0)));
dc.SetTextColor(RGB(255,255,255));
dc.FillRect(&rt,&CBrush(RGB(100,170,210)));
}
dc.DrawText(str,rt,DT_CENTER|DT_VCENTER|DT_SINGLELINE);
dc.Detach();
}

</code>

dashprasannajit wrote:

I can't find this atls.lib anywhere, on my computer or the Internet.

"The largest fire starts but with the smallest spark." - David Crow

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