C / C++ / MFC Discussion Boards

Anamika20056-Nov-06 19:58

Anamika2005

6-Nov-06 19:58

can somebody help me..
How to get the handle(HWND)of the window (dialog box)? i have tried the GetSafeHwnd()but as i don't have the Cwnd pointer also so that i can call this function . So how to get the CWnd pointer for that specific window?

Re: How get the handle of the window ?

Hamid_RT6-Nov-06 20:12

Hamid_RT

6-Nov-06 20:12

Is FindWindowhelpfuls ?

WhiteSky

Re: How get the handle of the window ?

Mark Salsbery7-Nov-06 6:37

Mark Salsbery

7-Nov-06 6:37

What do you need to get, an HWND or a CWnd pointer? Is the dialog in your app?

Re: How get the handle of the window ?

dharani7-Nov-06 21:38

dharani

7-Nov-06 21:38

Use
HWND hand= GetSafeHwnd();
CWnd* pWnd= CWnd::FromHandle();

redindian

Re: How get the handle of the window ?

dharani7-Nov-06 21:40

dharani

7-Nov-06 21:40

You do not need CWnd to call ::GetSafeHWnd()
::GetSafeHwnd() is a win32 API
CWnd::GetSafeHWnd is the same but MFC wrapped .

redindian

unresolved external symbol _wWinMain@16

Raghavendra Pise6-Nov-06 19:43

Raghavendra Pise

6-Nov-06 19:43

Hi Friends,
I am new to this discussion.
I am facing Linker error while building my project.

Error is:Creating library C:\Program Files\Quark\QuarkDDS 4\QuarkDDS\XTension\OptimakerSXT2.lib and object C:\Program Files\Quark\QuarkDDS 4\QuarkDDS\XTension\OptimakerSXT2.exp
LIBCD.lib(wwincrt0.obj) : error LNK2001: unresolved external symbol _wWinMain@16
C:\Program Files\Quark\QuarkDDS 4\QuarkDDS\XTension\OptimakerSXT2.xnt : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

I have done settings like: 1) c/c++ Tab->Preproccessor->WIN32,_DEBUG,_WINDOWS,_MBCS
2) Link-> Output->wWinMainCRTStartup.

Inspite of these settings i am getting Above errors.Anybody knows, please reply me.

Re: unresolved external symbol _wWinMain@16

prasad_som6-Nov-06 20:01

prasad_som

6-Nov-06 20:01

Raghavendra Pise wrote:
2) Link-> Output->wWinMainCRTStartup.

You might wanted to say Link-->Output-->Entry point symbol-->wWinMainCRTStartup

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: unresolved external symbol _wWinMain@16

Raghavendra Pise6-Nov-06 20:20

Raghavendra Pise

6-Nov-06 20:20

Hello Prasad,

Yes, I am using this setting in my project,
Link-->Output-->Entry point symbol-->wWinMainCRTStartup, but getting above errors.
I am not sure whether should i use this entry point or some other.If u know plz tell me

Raghavendra Pise

Re: unresolved external symbol _wWinMain@16

Hamid_RT6-Nov-06 20:02

Hamid_RT

6-Nov-06 20:02

I think you asked this question yesterday?did you get your answer

WhiteSky

Re: unresolved external symbol _wWinMain@16

Raghavendra Pise6-Nov-06 20:22

Raghavendra Pise

6-Nov-06 20:22

Ya yesterday i asked same question but didn't get solution,

I used thse settings.
Link-->Output-->Entry point symbol-->wWinMainCRTStartup, but getting above errors.
I am not sure whether should i use this entry point(wWinMainCRTStartup) or some other.If u know plz tell me

Re: unresolved external symbol _wWinMain@16

Hamid_RT7-Nov-06 4:20

Hamid_RT

7-Nov-06 4:20

See here[^] maybe its some helpful for you Smile | :)

WhiteSky

Re: unresolved external symbol _wWinMain@16

VCSharp0076-Nov-06 21:42

VCSharp007

6-Nov-06 21:42

Why you set 'entry point for UNICODE project' in a non-unicode project ??
We need not explicitly set any entry point sympol for Non-Unicode projects.

Or

If u intend make ur project UNICODE supportable then plz add 'UNICODE,_UNICODE' in c/c++ Tab->Preproccessor

Re: unresolved external symbol _wWinMain@16

Raghavendra Pise6-Nov-06 22:09

Raghavendra Pise

6-Nov-06 22:09

Thanks for ur feedback.
If i am remove entry point for my project, still i a getting same errors.

Creating library C:\Program Files\Quark\QuarkDDS 4\QuarkDDS\XTension\OptimakerSXT2.lib and object C:\Program Files\Quark\QuarkDDS 4\QuarkDDS\XTension\OptimakerSXT2.exp
LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
C:\Program Files\Quark\QuarkDDS 4\QuarkDDS\XTension\OptimakerSXT2.xnt : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

I think i should use some header file to resolve this problem.I already used <windows.h> header file.
Is there any header file, i have to include or any setting i want to do?

Re: unresolved external symbol _wWinMain@16

fat_boy6-Nov-06 23:43

fat_boy

6-Nov-06 23:43

From MSDN:

If you are using Unicode and MFC, you will get an unresolved external on _WinMain@16 if you don’t create an entrypoint to wWinMainCRTStartup. Use the /ENTRY option or type this value in the Project Settings dialog box. (To find this option in the development environment, click Settings on the Project menu, then click the Link tab, and click Output in the Category box.) See Unicode Programming Summary.

See the following Knowledge Base articles located in the Online Information System for more information. An easy way to reach an article is to copy a "Q" number above, open the Search dialog box from the Help menu and select the Query tab, then paste the number into the first text box and press ENTER.
Q125750 "PRB: Error LNK2001: '_WinMain@16': Unresolved External Symbol"

Q131204 "PRB: Wrong Project Selection Causes LNK2001 on _WinMain@16"

Q100639 "Unicode Support in the Microsoft Foundation Class Library"

Truth is the subjection of reality to an individuals perception

Re: unresolved external symbol _wWinMain@16

Raghavendra Pise7-Nov-06 0:34

Raghavendra Pise

7-Nov-06 0:34

Hi,
Thnaks for your feedback.
Sorry to say this, we are using DLL(BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpvReserved)) in our project not main or Winmain.

May i know Which entry-point want to use in my project?

Write text to the command prompt in Dlg based Appln.

zxc896-Nov-06 19:30

zxc89

6-Nov-06 19:30

I am using VC++ .NET(8 Version) to build a Dialog based application, however, my
application allows user to input command arguments from the Command prompt
window.

I want to write some help message when user enters "Some.exe /?" at the command prompt. How can I write text to the command prompt window if user enters the above arguments?(Some.exe /?)

Re: Write text to the command prompt in Dlg based Appln.

fat_boy6-Nov-06 23:50

fat_boy

6-Nov-06 23:50

I dont know about .Net, but MFC implements the following:

BOOL CSetupApp::InitInstance()
{
// Standard initialization
// If you are not using these features and wish to reduce the size
// of your final executable, you should remove from the following
// the specific initialization routines you do not need.

#ifdef _AFXDLL
Enable3dControls(); // Call this when using MFC in a shared DLL
#else
Enable3dControlsStatic(); // Call this when linking to MFC statically
#endif

CSetupDlg dlg;
m_pMainWnd = &dlg;

if(stricmp(m_lpCmdLine, "-f") == 0)
dlg.ForceInstall = TRUE;
else
dlg.ForceInstall = FALSE;

int nResponse = dlg.DoModal();
if (nResponse == IDOK)
{
// TODO: Place code here to handle when the dialog is
// dismissed with OK
}
else if (nResponse == IDCANCEL)
{
// TODO: Place code here to handle when the dialog is
// dismissed with Cancel
}

// Since the dialog has been closed, return FALSE so that we exit the
// application, rather than start the application's message pump.
return FALSE;
}

for dialog based apps.

ie, there is an inbuilt command line to the app, that you can handle, and choose to create the dialog or, in your case, just print to standard out.

Perhaps .Net has a similar mechanism.

Truth is the subjection of reality to an individuals perception

Backup policy algorithm.

baldha rakesh6-Nov-06 19:16

baldha rakesh

6-Nov-06 19:16

hi all,

can anybody help me on Differential Backup policy algorithm?

i want just algorithm for implement it on MFC.

Thanks & Regards
rakesh baldha

About Dll's

Neeraj Sinha6-Nov-06 19:14

Neeraj Sinha

6-Nov-06 19:14

Can you help me to know about the following dlls?
1.NSInst.dll
2.CPUID32.DLL
Actually as per my knowledge these dlls are used during creation
of installer setup file.But I don't know the exact purpose of these
dlls.If you have any resources or site link which can help me in
in this regard then please forward that to me.

With Regards

Neeraj Sinha
Netstudio
Pune

Re: About Dll's

Hamid_RT6-Nov-06 20:06

Hamid_RT

6-Nov-06 20:06

From where you download these files?

WhiteSky

problems on mutual class declaration introduction between classes

cy163@hotmail.com6-Nov-06 18:37

cy163@hotmail.com

6-Nov-06 18:37

There are two classes in my case, Class_A and Class_B. In Class_A.h, a Class_B member variable is declared. Hence, #include "Class_B.h" is put into Class_A.h. In Class_B.h, On the other hand, a Class_A member variable is declared. Hence, #include "Class_A.h" is put into Class_B.h.

However, the above arragement will cause C2146, C2501 errors. How to solve this dilemma.

Thanks,

Re: problems on mutual class declaration introduction between classes [modified]

Steve Echols6-Nov-06 18:51

Steve Echols

6-Nov-06 18:51

There's a couple of ways around the circular dependency problem:

a) Put your declarations in .h and put your definitions in .cpp.
b) Declare your classes, then in the same .h, put the definitions with the dependencies outside of the class.

a)

.h:

// Forward declarations (or includes)<br />
class Class_A;<br />
class Class_B;<br />
<br />
class Class_A<br />
{<br />
    Class_B* _b;<br />
<br />
    void func();<br />
};<br />
<br />
class Class_B<br />
{<br />
    Class_A* _a;<br />
<br />
    void func();<br />
};<br />

.cpp:

void Class_A::func()<br />
{<br />
    _b->func();<br />
}<br />
<br />
void Class_B::func()<br />
{<br />
    _a->func();<br />
}<br />

b)

.h:

// Forward declarations (or includes)<br />
class Class_A;<br />
class Class_B;<br />
<br />
class Class_A<br />
{<br />
    Class_B* _b;<br />
<br />
    void func();<br />
};<br />
<br />
class Class_B<br />
{<br />
    Class_A* _a;<br />
<br />
    void func();<br />
};<br />
<br />
<br />
// Definitions<br />
void Class_A::func()<br />
{<br />
    _b->func();<br />
}<br />
<br />
void Class_B::func()<br />
{<br />
    _a->func();<br />
}<br />

In either case, the classes are declared, then the class functions are defined after they're declared.

-- modified at 2:31 Tuesday 7th November, 2006

- S
50 cups of coffee and you know it's on!

Re: problems on mutual class declaration introduction between classes

Cedric Moonen6-Nov-06 20:25

Cedric Moonen

6-Nov-06 20:25

You certainly meant Class_A* _a and Class_B* _b for the class declaration, no ? Otherwise, if you don't work with pointer this won't work.

Cédric Moonen
Software developer

Charting control [Updated - v1.1]

Re: problems on mutual class declaration introduction between classes

Steve Echols6-Nov-06 20:29

Steve Echols

6-Nov-06 20:29

Oops! Yes. That's what I meant. My fingers got going a little too fast on the keyboard. Big Grin | :-D

Thanks!

- S
50 cups of coffee and you know it's on!

Re: problems on mutual class declaration introduction between classes

cy163@hotmail.com7-Nov-06 2:25

cy163@hotmail.com

7-Nov-06 2:25

I am a VC/MFC newbie. Why Class_A _a Class_B _b would cause errors. Why we cannot use them as we use 'int' 'float'. Would you please give more details.

Thank you.

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