How could I get main window handle in CDocument? - C / C++ / MFC Discussion Boards

Gadjuka8-Jun-04 0:57

8-Jun-04 0:57

I try to create a dynamic char-array and then copy a certain number of chars from another string to it:

<br />
char *tempLabel = new char[labelLen];             //Line 1<br />
strncpy(tempLabel, label, labelLen);              //Line 2<br />

When I step through the code the variables contains:
After line 1:
label = "resolutionXììììììììì....aso" (is an [128]-array)
tempLabel = "ìììììììììììýýýý" (as you see, 4 chars too much)
labelLen= 11;

After line 2:
label = "resolutionXììììììììì....aso"
tempLabel = "resolutionXýýýý" (Still too big!)
labelLen= 11;

Why??? I don't want those 'ý'-s, what's wrong? Does anyone have a clue?

Re: Crazy char-array

jmkhael8-Jun-04 1:59

jmkhael

8-Jun-04 1:59

if(labelLen>0)
{
char *tempLabel = new char[labelLen+1]; //Line 1 make room for \0
strncpy(tempLabel, label, labelLen); //Line 2
}

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Crazy char-array

Manfred Staiger8-Jun-04 2:01

Manfred Staiger

8-Jun-04 2:01

Try this:

char *tempLabel = new char[labelLen]; //your Line 1
memset(tempLabel, (int)'\0', labelLen);
strcpy(tempLabel, label); //Line 2

MS

Re: Crazy char-array

David Crow8-Jun-04 2:34

David Crow

8-Jun-04 2:34

This is exactly how buffer overruns are exploited (i.e., using strcpy).

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Crazy char-array

John R. Shaw8-Jun-04 17:57

John R. Shaw

8-Jun-04 17:57

DavidCrow wrote:
This is exactly how buffer overruns are exploited

I would say how they are caused not exploited.

INTP

Re: Crazy char-array

David Crow9-Jun-04 2:18

David Crow

9-Jun-04 2:18

Fair enough, but the point remains. Wink | ;)

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Crazy char-array

Gadjuka8-Jun-04 2:11

Gadjuka

8-Jun-04 2:11

Thanks guys!

Really stupid of me to forget about that '\0'. I should remember that by now... Blush | :O

How could I get main window handle in CDocument?

chenbuaa8-Jun-04 0:52

chenbuaa

8-Jun-04 0:52

BOOL CBeginDoc::OnNewDocument()
{
if (!CDocument::OnNewDocument())
return FALSE;

// TODO: add reinitialization code here
// (SDI documents will reuse this document)

m_pScene = new CScene( AfxGetMainWnd()->m_hWnd );
return TRUE;
}
Program exit when execute AfxGetMainWnd(),what's wrong! Confused | :confused:

Re: How could I get main window handle in CDocument?

Manfred Staiger8-Jun-04 1:22

Manfred Staiger

8-Jun-04 1:22

When your application starts, the main window isn't already created when OnNewDocument is called the first time. Try this and it will work:

BOOL CBeginDoc::OnNewDocument()
{
if (!CDocument::OnNewDocument())
return FALSE;

// TODO: add reinitialization code here
// (SDI documents will reuse this document)

if(AfxGetApp()->m_pMainWnd!=0L)
{
m_pScene = new CScene( AfxGetMainWnd()->m_hWnd );
}

return TRUE;
}

Hope this helps

MS

Re: How could I get main window handle in CDocument?

Andrew Quinn AUS8-Jun-04 1:28

Andrew Quinn AUS

8-Jun-04 1:28

Hi there,

Because the MainFrame isn't the active window yet - AfxGetMainWnd will return a NULL pointer in which you use without testing.

Why is it that you are initialising your object with the Main window anyway? The object can use the AfxGetMainWnd when it needs access without you setting the value in the constructor. If you are setting the object to use a particular HWND, then set it to NULL in the constructor, then when the object needs the HWND test if it's NULL - if yes then perform AfxGetMainWnd otherwise use the HWND it has.

Hope this helps,
Andy

ActiveX Controls

sweep1238-Jun-04 0:43

sweep123

8-Jun-04 0:43

I have bought some ActiveX controls from Global Majic about 6 months ago (only get 3 months support), but when I deploy my application I get an Assertion error (its build for Release).
I dont see in the deployment (Visual Studio .Net 2002) how the OC are deployed.

Do I need to register them on the target PC?

Or is the Assertion proble a Red Herring?

Re: ActiveX Controls

Cedric Moonen8-Jun-04 1:14

Cedric Moonen

8-Jun-04 1:14

Normally you just have to copy the .ocx file on the target computer and register it using regsvr32.exe.

Re: ActiveX Controls

sweep1238-Jun-04 5:12

sweep123

8-Jun-04 5:12

OK, thanks. I just wondered if the deployment process would do this.

Windows Platform SDK

guy20048-Jun-04 0:36

guy2004

8-Jun-04 0:36

I want develop Firewall But how to use Windows Platform SDK. I want Help is it . Your can't explaint or detail about web to detail about Windows Platform SDK . Where i can find it .

Re: Windows Platform SDK

GuimaSun8-Jun-04 3:25

GuimaSun

8-Jun-04 3:25

The platform SDK ships with your Visual Studio installation, you don´t need to install it.
You can download the latest version from MS or install from an MSDN CD, it can be necessary if you need to use really new features, or uncommon APIs that don´t ships with VStudio, but usually it is the case for less than 1% of the programs you need to develop.

GuimaSun
www.nexsun.com.br
NEXSUN TechZone

Re: Windows Platform SDK

Diddy10-Jun-04 2:56

Diddy

10-Jun-04 2:56

Errrrrrrrrrr.

If your talking about VC6 - that was shiped in 98. If you set WINVER to 0x500 to target Win 98 and 2k, you will get a message saying that the headerd included with VC6 are for the BETA versions of these OS's.

Yes, you don't need to install the new platform SDK for most things. But the one that comes with VC6 can only really be used to offically target NT and 95.... Anything that 98 has and 95 doesn't, you should use a newer SDK.

Re: Windows Platform SDK

Diddy8-Jun-04 3:27

Diddy

8-Jun-04 3:27

Get it from http://www.microsoft.com/msdownload/platformsdk/sdkupdate/

Finding process genereating ARP reuquests

abdul moeed7-Jun-04 23:46

abdul moeed

7-Jun-04 23:46

I want to develop a VC application which can tell me the name of process or the application generating ARP Requests.

Service Running on a Port

abdul moeed7-Jun-04 23:43

abdul moeed

7-Jun-04 23:43

I am developing a ports scanner for networks. Is there any way to find out what service is running on an open port, i ll be just scanning the popular ports e.g ftp,telnet,http etc, given u have the Admin rights of the domain and what if you don't have the admin rights of the domain.

Removing a monitor program

Shree7-Jun-04 23:43

Shree

7-Jun-04 23:43

Some addon type of programs monitor the host program, and once it is created, they add a control to the program. The control is then a child of the host program (as observed using Spy++). If we close the monitor program, then the host program gives an illegal operation error.

How is this done, and how can we programmatically and safely remove the monitor program?

Executable's Name

ShankarPS7-Jun-04 23:30

ShankarPS

7-Jun-04 23:30

Is it possible to get executable's name using it's handle?

Re: Executable's Name

Member 1624627-Jun-04 23:33

Member 162462

7-Jun-04 23:33

Use This

DWORD GetModuleFileNameEx(
HANDLE hProcess, // handle to process
HMODULE hModule, // handle to module
LPTSTR lpFilename, // path buffer
DWORD nSize // maximum characters to retrieve
);

DWORD GetModuleFileName(
HMODULE hModule, // handle to module
LPTSTR lpFilename, // file name of module
DWORD nSize // size of buffer
);

~Rahuraman.K

Re: Executable's Name

ShankarPS8-Jun-04 1:25

ShankarPS

8-Jun-04 1:25

Thanks, GetModuleFileNameEx works but again it needs processid.

Re: Executable's Name

Blake Miller9-Jun-04 4:11

Blake Miller

9-Jun-04 4:11

Okay, so call GetCurrentProcessId() first.

Fail to initialise a CView derived view within a Splitter Window

Seve Ho7-Jun-04 23:13

Seve Ho

7-Jun-04 23:13

Hi All,

I am writing a MFC program. It has a splitter window which contains 2 CView and CFormView derived Views. I wrote it based on the acticle written by pt315 "Splitter Window Tutorial".(http://www.codeproject.com/splitter/splitterwindowtutorial.asp"

The program up and running in VC7 debug mode. However, when I run the .exe file built by VC7, it seems cannot create the CView derived View and the program abort with 2 messagebox, "Error setting up left view" and "Fail to create empty document".

And I dont have any idea about why it fail when running by .exe.

I attached the code where the problem occur. Could anyone provide me some advice why this is happened? Confused | :confused:

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) <br />
{<br />
<br />
	//calculate client size<br />
	CRect cr;<br />
	GetWindowRect( &cr );<br />
	<br />
	// Create the main splitter with 1 row and 2 columns<br />
	if ( !m_mainSplitter.CreateStatic( this, 1, 2 ) )<br />
	{<br />
		MessageBox( "Error setting up m_mainSplitter", "ERROR", MB_OK | MB_ICONERROR );<br />
		return FALSE;<br />
	}<br />
<br />
	// The views for each pane must be created <br />
	if ( !m_mainSplitter.CreateView( 0, 0, RUNTIME_CLASS(CMPVIEWERView),<br />
		CSize(cr.Width()/2, cr.Height()), pContext ) )<br />
	{<br />
		MessageBox( "Error setting up left view", "ERROR", MB_OK | MB_ICONERROR );<br />
		return FALSE;<br />
	}<br />
<br />
	if ( !m_mainSplitter.CreateView( 0, 1, RUNTIME_CLASS(CSTATVIEW),<br />
		CSize(cr.Width()/2, cr.Height()), pContext ) )<br />
	{<br />
		MessageBox( "Error setting up right view", "ERROR", MB_OK | MB_ICONERROR );<br />
		return FALSE;<br />
	}<br />
<br />
	//change flag to show splitter created<br />
	m_bInitSplitter = true;<br />
<br />
	CMPVIEWERView * mpv ;											// Set 2-View Pointers<br />
	mpv = (CMPVIEWERView *) m_mainSplitter.GetPane(0,0);			<br />
	mpv->m_pStatView = (CSTATVIEW *) m_mainSplitter.GetPane(0, 1);<br />
<br />
	m_pMPVIEWERView = mpv;<br />
<br />
	//return TRUE instead of the parent method since that would<br />
	//not show our window<br />
	return TRUE;<br />
}

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