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As I understand it, VC++.Net incorporates the idea of a common runtime library, the CLR, that is installed with the .Net Framework. This allows a developer to use whatever .Net-enabled language is most convenient for the task at hand to create a program that will be compatible with other pieces written in other languages. Previous versions of C++ made it difficult to use, for instance, a control developed in VB, because of differences in the internal implementations of variable types and procedures. In the .Net scenario, all languages utilize the same libraries, and modules written in any language are interoperable. In theory, you can bang out a GUI on VB, a language nicely suited for that task, and implement the computation-intensive parts of the program in VC++, without having to worry about type conversions and such to accomodate the different ways these are implemented in each language.
There are probably several other reasons to adopt the .Net approach, but my understanding is limited by my lack of experience with it. I'll leave it to others to elaborate...
Some people think of it as a six-pack; I consider it more of a support group.
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I have set up the executable directory and it runs the new compiler.
But I get about 30 errors in my program that never showed up with the old compiler.
They appear to all arise from <code><afxtempl.h></code> (MFC 6).
I think it is to do with the new ISO conformance. I looked at the msdn library, and there are a few breaking changes todo with templates, but since im not very good with the technical error jargon, I don't have a clue what to do.
Could some look into it and tell me what i need to edit to get it to work?
I was really hoping I could save me a few $'s and just upgrade the compiler not the IDE, since all the new IDE features are mainly for .NET (which I don't care much about)
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Edit: I have tried CalcDynamicLayout(80, LM_HORZ|LM_LENGTHY); inside CMainFrame::OnCreate after the bar has been created and no luck 
How can I set the width or height of a CControlBar programmatically after it is created? The control bar when first created is large (very wide) and i'm not using SaveBarState or anything so each time program loads the control bar is huge???
I plan on eventually using LoadBarState, but how do I resize a control bar when application first run???
Thanks
Cheers 
How do I print my voice mail?
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CControlBar is a derived class from CWnd. You can apply any function related to CWnd on it.
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I tried calling SetWindowPos, but it didn't work???
How do I print my voice mail?
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Hi all, ibe been coding for over a year now, and ibe never actually stopped to think about this (duh).
if i need to define a constant value like a string, a number, etc. for my app
should i:
#define MY_STRING _T("this is a string")
#define MY_NUMBER 100
or:
const TCHAR* MY_STRING = _T("this is a string");
const int MY_NUMBER = 100;
and why?
needless to say, both approaches work fine, and most code ibe seen uses the #define approach, however, a book i have (Beginning Visual C++ by Ivor Horton) sais that i should use the "const" approach, and that the #define one is obsolete and should be avoided (doesnt mention why tho)
Thanks!
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You should not consider to use #define to create a constant.
#define define a macro. That mean, it will be used by preprocessor. There is not type checking here. The identifier, that appear after define keyword, exists only during preprocessing.
const define a constant. That mean, it will be used by compiler. Therefore, compiler do alot base on that define.
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1) Regarding to the very purpose in your question, the main difference is ~ scope. A define lasts its definition till the end of the compilation module; but a const literal only lives within its scope. For example, try to compile the code below:
void Foo()
{
#define MAX_SIZE 192
}
bool Bar()
{
#define MAX_SIZE 512 // Oops!
int iSize = MAX_SIZE;
}
When your program is very large with a lot of source files, and the define(s) hide somewhere very deep in some header file(s) included by the other header files, you would find it annoying, because it needs to undef and ......
2) There are some other reasons about avoiding macros (not related to your question). Please read Section 7.8 - Macro in the book The C++ Programming Language, 3rd by Stroustrup.
"Macros are very important in C but have far fewer uses in C++. The first rule about macros is: Don't use them unless you have to. Almost every macro demonstrates a flaw in the programming language, in the program, or in the programmer. Because they rearrange the program text before the compiler proper sees it, macros are also a major problem for many programming tools. ...... " ~ Stroustrup.
The section demonstrates many flaws!
Maxwell Chen
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Good points, ill stick with const from now on.
Thanks
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Be aware that const may allocate memory.
To say #define is obsolete is idiotic. It's a tool that is extremely useful. I prefer it not be used for strings, but on occasion it's the best solution for a problem.
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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Ok this is a really dasic dialog program but I can't figure what I'm donig wrong?? The problem I am having is get the dialog title to change to the caption of the button pressed. Help!!
--------------------Configuration: Retry - Win32 Debug--------------------
Compiling resources...
Compiling...
StdAfx.cpp
Compiling...
Retry.cpp
c:\c++ projects\retry\retrydlg.h(18) : error C2061: syntax error : identifier 'UNIT'
c:\c++ projects\retry\retrydlg.h(19) : error C2146: syntax error : missing ';' before identifier 'm_nIDofLastButton'
c:\c++ projects\retry\retrydlg.h(19) : error C2501: 'UNIT' : missing storage-class or type specifiers
c:\c++ projects\retry\retrydlg.h(19) : error C2501: 'm_nIDofLastButton' : missing storage-class or type specifiers
RetryDlg.cpp
c:\c++ projects\retry\retrydlg.h(18) : error C2061: syntax error : identifier 'UNIT'
c:\c++ projects\retry\retrydlg.h(19) : error C2146: syntax error : missing ';' before identifier 'm_nIDofLastButton'
c:\c++ projects\retry\retrydlg.h(19) : error C2501: 'UNIT' : missing storage-class or type specifiers
c:\c++ projects\retry\retrydlg.h(19) : error C2501: 'm_nIDofLastButton' : missing storage-class or type specifiers
C:\C++ Projects\Retry\RetryDlg.cpp(208) : error C2660: 'ChangeDialogTitle' : function does not take 1 parameters
C:\C++ Projects\Retry\RetryDlg.cpp(213) : error C2660: 'ChangeDialogTitle' : function does not take 1 parameters
C:\C++ Projects\Retry\RetryDlg.cpp(218) : error C2660: 'ChangeDialogTitle' : function does not take 1 parameters
C:\C++ Projects\Retry\RetryDlg.cpp(221) : error C2065: 'UNIT' : undeclared identifier
C:\C++ Projects\Retry\RetryDlg.cpp(221) : error C2146: syntax error : missing ')' before identifier 'nID'
C:\C++ Projects\Retry\RetryDlg.cpp(221) : error C2182: 'ChangeDialogTitle' : illegal use of type 'void'
C:\C++ Projects\Retry\RetryDlg.cpp(221) : error C2350: 'CRetryDlg::ChangeDialogTitle' is not a static member
C:\C++ Projects\Retry\RetryDlg.cpp(221) : error C2059: syntax error : ')'
C:\C++ Projects\Retry\RetryDlg.cpp(222) : error C2143: syntax error : missing ';' before '{'
C:\C++ Projects\Retry\RetryDlg.cpp(222) : error C2447: missing function header (old-style formal list?)
Generating Code...
Error executing cl.exe.
Retry.exe - 18 error(s), 0 warning(s)
// RetryDlg.h : header file
//
#if !defined(AFX_RETRYDLG_H__4A3C71B3_E316_48A5_B38E_7F3E778D47DD__INCLUDED_)
#define AFX_RETRYDLG_H__4A3C71B3_E316_48A5_B38E_7F3E778D47DD__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
/////////////////////////////////////////////////////////////////////////////
// CRetryDlg dialog
class CRetryDlg : public CDialog
{
// Construction
public:
// Trouble Rigth Here Line 18
void ChangeDialogTitle(UNIT nID);
// Trouble Rigth Here Line 19
UNIT m_nIDofLastButton;
CRetryDlg(CWnd* pParent = NULL); // standard constructor
// Dialog Data
//{{AFX_DATA(CRetryDlg)
enum { IDD = IDD_RETRY_DIALOG };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CRetryDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
HICON m_hIcon;
// Generated message map functions
//{{AFX_MSG(CRetryDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnSh();
afx_msg void OnEd();
afx_msg void OnL();
afx_msg void OnC();
afx_msg void OnR();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_RETRYDLG_H__4A3C71B3_E316_48A5_B38E_7F3E778D47DD__INCLUDED_)
// RetryDlg.cpp : implementation file
//
#include "stdafx.h"
#include "Retry.h"
#include "RetryDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
afx_msg void OnPlus();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
ON_BN_CLICKED(IDC_Plus, OnPlus)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CRetryDlg dialog
CRetryDlg::CRetryDlg(CWnd* pParent /*=NULL*/)
: CDialog(CRetryDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CRetryDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CRetryDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CRetryDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CRetryDlg, CDialog)
//{{AFX_MSG_MAP(CRetryDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_SH, OnSh)
ON_BN_CLICKED(IDC_ED, OnEd)
ON_BN_CLICKED(IDC_L, OnL)
ON_BN_CLICKED(IDC_C, OnC)
ON_BN_CLICKED(IDC_R, OnR)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CRetryDlg message handlers
BOOL CRetryDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// TODO: Add extra initialization here
return TRUE; // return TRUE unless you set the focus to a control
}
void CRetryDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
void CRetryDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CRetryDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CRetryDlg::OnSh()
{
BOOL bVisible = GetDlgItem(IDC_L) ->IsWindowVisible();
GetDlgItem(IDC_L) ->ShowWindow(bVisible? SW_HIDE : SW_SHOW);
GetDlgItem(IDC_C) ->ShowWindow(bVisible? SW_HIDE : SW_SHOW);
GetDlgItem(IDC_R) ->ShowWindow(bVisible? SW_HIDE : SW_SHOW);
GetDlgItem(IDC_SH) ->SetWindowText(bVisible? "SHOW" : "HIDE");
}
void CRetryDlg::OnEd()
{
BOOL bState = GetDlgItem(IDC_L) ->IsWindowEnabled();
GetDlgItem(IDC_L) ->EnableWindow(!bState);
GetDlgItem(IDC_C) ->EnableWindow(!bState);
GetDlgItem(IDC_R) ->EnableWindow(!bState);
GetDlgItem(IDC_ED) ->SetWindowText(bState? "ENABLE" : "DISABLE");
}
void CAboutDlg::OnPlus()
{
MessageBox ("Please Register Your Shareware", "!!!!!!");
}
void CRetryDlg::OnL()
{
ChangeDialogTitle(IDC_L);
}
void CRetryDlg::OnC()
{
ChangeDialogTitle(IDC_C);
}
void CRetryDlg::OnR()
{
ChangeDialogTitle(IDC_R);
}
void CRetryDlg::ChangeDialogTitle(UNIT nID)
{
CString strCaption;
GetDlgItem(nID) ->GetWindowText(strCaption);
strCaption += " was pressed";
if(m_nIDofLastButton == nID)
strCaption += " again";
SetWindowText(strCaption);
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---Mark---- wrote:
c:\c++ projects\retry\retrydlg.h(18) : error C2061: syntax error : identifier 'UNIT'
Mark, open the file, retrydlg.h, and correct the typename 'UNIT' with 'UINT'.
Maxwell Chen
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Thanks!!!!
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I am a noob and that wasn kind of a lame mistake
But how would I in the future narrow down and single out my misspelling
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---Mark--- wrote:
But how would I in the future narrow down and single out my misspelling
When we are fixing the compilation errors, the 1st error is the most important one we have to look at. Basically the rest hundrads would probably be gone after we have fixed the first.
Regarding to the misspellings, hummm.... The only way, I guess, is to take a rest and have a cup of tea. Later you will see more clearer!
Maxwell Chen
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Hello all,
I used to program Unix(C/C++) and now trying to learn program in Windows. I would appreciate if someone could kindly recommend me some resources, books, URLs, for learning Windows programming. I am espeacilly interested in system and network programming, and device driver development. These are the area I used to do when I programmed Unix.
Thank you very much.
I can be reached at vnm6@lycos.com
I am a Unix programmer and trying to learn Windows now.
Ken Ji
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Try Programming Windows by Charles Petzold, Ms Press (C++)
Chris Maunder has a list of recommended books in one of his article. Do check on that also.
Sonork 100.41263:Anthony_Yio
Life is about experiencing ...
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Thank you Anthony for your info.
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Hello I was trying to debug this code (see below), because after a few minutes it crashes.
So I used a try{ }catch(...) to catch the exception but I dont know what type of exception it was. Is there a way to tell?
I tried using TRY{} CATCH_ALL() but it dod not catch anything??
try{<br />
DeleteObject(hbr);
hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);<br />
if (nCtlColor == CTLCOLOR_STATIC )<br />
{<br />
CWnd *Ctrl = GetDlgItem(pWnd->GetDlgCtrlID());<br />
<br />
if (Ctrl)<br />
{ <br />
CRect Rect; <br />
Ctrl->GetWindowRect(&Rect);<br />
this->ScreenToClient(&Rect);<br />
COLORREF Clr = GetDC()->GetPixel(Rect.left-1, Rect.top-1);<br />
hbr = CreateSolidBrush(Clr);<br />
ASSERT(pDC);<br />
if(!m_staticTextBgd)<br />
pDC->SetBkColor(Clr);<br />
pDC->SetTextColor(RGB(m_fntR,m_fntG,m_fntB));<br />
pDC->SetBkMode(m_staticTextBgd?OPAQUE:TRANSPARENT);<br />
}<br />
}<br />
}<br />
catch(...)<br />
{<br />
printf("Error");<br />
}<br />
I tried catching CResourceException and CMemoryException and many others but it did not catch anything?
How do I know what exception is being thrown?
---
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Try catching a CException, that might work. If it does get the error message and it might help you figure out what type of exception is being thrown.
- Aaron
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First thing I tried, it seems it does not throw a CException at all.
I am sure it is a memory resource overflow problem, even though I am deleting my HBRUSH object.
---
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Appart from not knowing how to get infomation from an unknown exception, I have fixed my code problem.
COLORREF Clr = GetDC()->GetPixel(Rect.left-1, Rect.top-1);
This line does not like being called so often.(why??) So I just set Clr to the background color as it actually does not change after initilising it.
Clr = RGB(m_bkR, m_bkG, m_bkB);
cheers
---
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There are a limited number of device contexts available at any one time. Every time this executes, you are locking one of these DCs with GetDC() but not releasing it with ReleaseDC(). Eventually, there will be no DCs available, and GetDC() will return NULL. Since you're not doing any error checking, you'll get a NULL-pointer exception while trying to call GetPixel().
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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Two questions:
One, can interface methods have default parameters? i.e.
HRESULT MyMethod ([in] int size = 0) Two, can a class that implements and interface have a constructor with paramaters?
Thanks!
- Aaron
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