C / C++ / MFC Discussion Boards

JKallen4-Feb-05 15:06

4-Feb-05 15:06

When inheriting a virtual class, do I have to completely redefine virtual functions of the base class. For instance, does the function following COMENT A work, or do I have to completely rebuild the operator = function?

Thanks.

class Base{
public:
Base();
~Base();
virtual Base& operator = (const Base& base);
};

class Inherited : virtual public Base{
public:
Inherited();
~Inherited();
virtual Inherited& operator = (const Inherited& inherited);
};

//COMENT A
Inherited& Inherited::operator = (const Inherited& inherited){
if (&inherited != this){
Base::operator = (inherited);
//do some other copying
}
return *this;
}

Re: Virtual Classes

Bob Ciora5-Feb-05 2:59

Bob Ciora

5-Feb-05 2:59

Why are you using virtual inheritance here? Generally, you inherit virtually when you're using multiple inheritance, and when those base classes share some common base class at some point. For single inheritance, as in your example, you don't need to use virtual inheritance when declaring the class.

For your example, why not try compliling and single-stepping through the code? That way, you'll know if it works or not. Personally, I'm not sure Smile | :)

Bob Ciora

Re: Virtual Classes

JKallen5-Feb-05 4:55

JKallen

5-Feb-05 4:55

Hi. Thanks for your response. I am using multiple inheritance. I just didn't want to burden a potential responder with reading unecessary code.

With respect to your comment, I have stepped through, and it doesn't appear that I have to completely redefine the function. I can call the base function in the derived function even when the base function is virtual and it calls the right (or wrong depending on your view) version. The documentation suggests this should not be the case.

Active Contours - snake

merlinos4-Feb-05 11:03

merlinos

4-Feb-05 11:03

Does anyone know if there is a a C or C++ library to implement the GVF snake method for edge detection?
If not, has anybody tried to implement GVF?

Thanks,
Merlinos

Resizing view

act_x4-Feb-05 10:57

act_x

4-Feb-05 10:57

I have an MDI application and am forcing two different views for one document .
This is code I got from Code Guru

1. Create a second view class for the second type of data display (using ClassWizard).

2. Construct a second CMultiDocTemplate in CWinApp::InitInstance(), using the second view class and the same document and child frame as the first. Store its pointer in the app class, but do NOT call CWinApp::AddDocTemplate() with this one - otherwise the app will ask the user what type of doc to create whenever you try to create a new document.

3. In CWinApp::ExitInstance(), delete this second doc template as it does not get automatically deleted like the first one does (because it was not added to the app).

4. In the document's OnNewDocument(), get a pointer to the second template from the app object, and then call CreateNewFrame() and InitialUpdateFrame() (in that order) with this doc template; use the document's 'this' pointer for the document to use (so that the second view shares the first document), and NULL for the frame window (since the first MDI child frame does not exist when OnNewDocument() is called - this does not matter). The frame pointer to use in InitialUpdateFrame() is the return value from CreateNewFrame().

Note: As both views share the same document, OnNewDocument() only gets called once per document - therefore the above method of automatically creating the second frame will not cause any problems.

5. Each view can now do its own drawing based on the data in the document. Note that the second view will refer to a generic CDocument pointer, which you will have to cast to the correct document class.

I find that the views are not sized properly . Where exactly should i resize the view
In other words where should the code to grab the parents client rect and setting an appropriate position happen
is it in my CMDIChildWnd class ? If yes what call

Thanks

Engineering is the effort !

Help Creating Win32 Rich Text Box

InflatableGarfield4-Feb-05 9:27

InflatableGarfield

4-Feb-05 9:27

Hi, Ive been trying to make a standard Win32 Rich Text Box. Ive made this but the function never succeeds:

HWND main_text_handle = NULL;<br />
main_text_handle = CreateWindowEx(NULL,<br />
                                  "RICHEDIT_CLASS",<br />
                                  "",<br />
                                  WS_CHILD | WS_VISIBLE | ES_AUTOVSCROLL | ES_LEFT | ES_MULTILINE | ES_NOHIDESEL,<br />
                                  0, 0,<br />
                                  width, height,<br />
                                  main_window_handle,<br />
                                  NULL,<br />
                                  hinstance,<br />
                                  NULL);

Why wont the function work? Please help - staring at this function for hours isnt good for the brain.
Thanks!

Re: Help Creating Win32 Rich Text Box

C^hris L^osinger4-Feb-05 10:38

C^hris L^osinger

4-Feb-05 10:38

are you calling AfxInitRichEdit in your app's InitInstance ?

(you should)

Image Toolkits | Image Processing | Cleek

Re: Help Creating Win32 Rich Text Box

InflatableGarfield4-Feb-05 11:17

InflatableGarfield

4-Feb-05 11:17

Thanks, but...

Where is the AfxInitRichEdit function? What do I need to include?

Re: Help Creating Win32 Rich Text Box

C^hris L^osinger4-Feb-05 12:32

C^hris L^osinger

4-Feb-05 12:32

InflatableGarfield wrote:
Where is the AfxInitRichEdit function?

Viewrich.cpp

InflatableGarfield wrote:
What do I need to include?

afxwin.h

Image Toolkits | Image Processing | Cleek

Re: Help Creating Win32 Rich Text Box

Jörgen Sigvardsson4-Feb-05 13:03

Jörgen Sigvardsson

4-Feb-05 13:03

You need to load the richedit control DLL. Calling LoadLibrary(_T("riched20.dll")) before CreateWindowsEx() should do the trick.

--
My name in Katakana is ヨルゲン.
My name in German is Jörgen.

I blog too now[^]

Re: Help Creating Win32 Rich Text Box

Jörgen Sigvardsson4-Feb-05 12:58

Jörgen Sigvardsson

4-Feb-05 12:58

I don't think AfxXXX() does any good in a pure win32 program...

--
My name in Katakana is ヨルゲン.
My name in German is Jörgen.

I blog too now[^]

Re: Help Creating Win32 Rich Text Box

Jörgen Sigvardsson4-Feb-05 13:10

Jörgen Sigvardsson

4-Feb-05 13:10

BTW, you should use RICHEDIT_CLASS as argument to CreateWindowEx, and not "RICHEDIT_CLASS". RICHEDIT_CLASS is a #define, expanding into either "RichEdit20A" or "RichEdit20W" depending on your unicode preference.

--
My name in Katakana is ヨルゲン.
My name in German is Jörgen.

I blog too now[^]

Re: Help Creating Win32 Rich Text Box

InflatableGarfield5-Feb-05 0:02

InflatableGarfield

5-Feb-05 0:02

I think Ive got it - heres my current code:

LoadLibrary("riched20.dll")<br />
main_text_handle = CreateWindowEx(NULL,<br />
RICHEDIT_CLASS,<br />
"",<br />
WS_CHILD | WS_BORDER | WS_VISIBLE | ES_AUTOVSCROLL | ES_LEFT | ES_MULTILINE | ES_NOHIDESEL,<br />
0, 0,<br />
width, height,<br />
main_window_handle,<br />
NULL,<br />
hinstance,<br />
NULL)

Just need to look at some of the messages on MSDN but it works!
Thanks everyone for your help!

Moving Projects

Grahamfff4-Feb-05 9:19

Grahamfff

4-Feb-05 9:19

My project (VS 7.1) builds and run OK on my Windows 2K PC, but when I clean the solution and copy it over to a Windows XP PC I get loads of error, (see below) I cant seem to find the cause.

The cod HAS NOT changed!

c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1553): error C2059: syntax error : ')'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1640): error C2059: syntax error : ')'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1647): error C2059: syntax error : ')'
\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(205): error C2143: syntax error : missing ';' before '*'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1620): error C2143: syntax error : missing ';' before '__stdcall'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1553): error C2146: syntax error : missing ')' before identifier 'hResData'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): error C2146: syntax error : missing ')' before identifier 'hResData'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(5216): error C2146: syntax error : missing ';' before identifier 'CompletionPort'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(5216): error C2146: syntax error : missing ';' before identifier 'CompletionPort'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(208): error C2146: syntax error : missing ';' before identifier 'GLOBALHANDLE'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(208): error C2146: syntax error : missing ';' before identifier 'GLOBALHANDLE'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1628): error C2370: 'HGLOBAL' : redefinition; different storage class
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(205): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(206): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(207): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(208): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(209): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(334): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(340): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(204): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(205): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(206): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(207): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(208): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(209): error C2378: 'HANDLE' : redefinition; symbol cannot be overloaded with a typedef
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): error C2440: 'initializing' : cannot convert from 'int' to 'LPVOID'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1655): error C2440: 'initializing' : cannot convert from 'int' to 'LPVOID'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): error C2440: 'initializing' : cannot convert from 'int' to 'LPVOID'
\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1671): error C2491: 'GlobalUnlock' : definition of dllimport data not allowed
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): error C2491: 'LockResource' : definition of dllimport data not allowed
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): error C2491: 'LockResource' : definition of dllimport data not allowed
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(683): error C2501: '_CREATE_PROCESS_DEBUG_INFO::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(684): error C2501: '_CREATE_PROCESS_DEBUG_INFO::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(685): error C2501: '_CREATE_PROCESS_DEBUG_INFO::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(683): error C2501: '_CREATE_PROCESS_DEBUG_INFO::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(684): error C2501: '_CREATE_PROCESS_DEBUG_INFO::HANDLE' : missing storage-class or type specifiers
C2501: '_PROCESS_INFORMATION::hThread' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(8211): error C2501: '_RTL_CRITICAL_SECTION::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(8212): error C2501: '_RTL_CRITICAL_SECTION::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinNT.h(8211): error C2501: '_RTL_CRITICAL_SECTION::HANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1620): error C2501: 'HGLOBAL' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1628): error C2501: 'HGLOBAL' : missing storage-class or type specifiers
\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(204): error C2501: 'SPHANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinDef.h(204): error C2501: 'SPHANDLE' : missing storage-class or type specifiers
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1630): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1639): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1646): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1654): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1670): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1630): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1639): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1646): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1654): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1670): error C3861: 'HGLOBAL': identifier not found, even with argument-dependent lookup
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1676): fatal error C1003: error count exceeds 100; stopping compilation
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1676): fatal error C1003: error count exceeds 100; stopping compilation
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1553): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1630): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1640): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1647): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1655): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1671): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1553): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1560): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1630): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1640): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1647): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1655): warning C4229: anachronism used : modifiers on data are ignored
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1671): warning C4229: anachronism used : modifiers on data are ignored

grahamfff

Re: Moving Projects

Steve Maier4-Feb-05 9:59

Steve Maier

4-Feb-05 9:59

Do you have the same build environment including platform SDK on both machines?

Steve Maier, MCSD MCAD

Re: Moving Projects

Grahamfff4-Feb-05 10:02

Grahamfff

4-Feb-05 10:02

I installed VS 7.1 on both PCs from the same set of disks.

They were no problems with VS 7.0, but some project (not all) produce these errors with VS 7.1.

grahamfff

Re: Moving Projects

Steve Maier4-Feb-05 10:07

Steve Maier

4-Feb-05 10:07

I only have VS2005 installed here, but what does the line in Winbase.h say?

c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\WinBase.h(1553): error C2059: syntax error : ')'

Steve Maier, MCSD MCAD

Re: Moving Projects

Grahamfff5-Feb-05 3:54

Grahamfff

5-Feb-05 3:54

Th line in WinBase.h is highlighted below:-

WINBASEAPI
BOOL
WINAPI
FreeResource(
IN HGLOBAL hResData
); <-------------------

grahamfff

iPod SDK?

Ravi Bhavnani4-Feb-05 8:47

Ravi Bhavnani

4-Feb-05 8:47

Much to my surprise, I received a 20G iPod (and a yet to arrive auto accessory) for my birthday! Naturally, the first thing I want to do is to write my own cataloging and song transfer tool. I have a fair amount of code to handle cataloging, MP3 tags, playback, etc. but I have no idea how to communicate with the iPod from a Windows app.

Any pointers would be much appreciated. Thanks!

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

(Never mind) iPod SDK?

Ravi Bhavnani4-Feb-05 9:08

Ravi Bhavnani

4-Feb-05 9:08

iTunes COM SDK[^] Cool | :cool:

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Re: (Never mind) iPod SDK?

2249174-Feb-05 18:04

224917

4-Feb-05 18:04

Thanks

suhredayan
There is no spoon.

Re: (Never mind) iPod SDK?

ThatsAlok4-Feb-05 22:11

ThatsAlok

4-Feb-05 22:11

Gudie Gudie,
But i Don't have One Sigh | :sigh:

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

Java gui to c++ back end

monageasmear4-Feb-05 8:24

monageasmear

4-Feb-05 8:24

Can anyone guide me in the right direction here want a java gui to link to my Visual c++ files, any ideas????

Re: Java gui to c++ back end

Peter Weyzen4-Feb-05 8:37

Peter Weyzen

4-Feb-05 8:37

You should visit a thing called JNI -- Java Native Interface.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<A HREF="http://www.santacruznetworks.com">Santa Cruz Networks</A>

Re: Java gui to c++ back end

Ravi Bhavnani4-Feb-05 8:38

Ravi Bhavnani

4-Feb-05 8:38

What do you mean by "link to my Visual c++ files" ? Are you looking for a Java IDE for VC++ development? If so, Eclipse[^] is almost definitely the way to go.

/ravi

My new year's resolution: 2048 x 1536
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