Re: Omit Forward Declaration ? - C / C++ / MFC Discussion Boards

Re: Using delegates in vc++

Madhu Nair29-Dec-09 22:03

Madhu Nair

29-Dec-09 22:03

Anu_Bala wrote:
static void OnCallClick(CString msg)
{
}

static void OnCallClick(System::String^ msg)<br />
{<br />
}

Its only a guess... please try ; I think the reason is already said by Maxwell.

Re: Using delegates in vc++

Anu_Bala29-Dec-09 22:22

Anu_Bala

29-Dec-09 22:22

Its working.Thank u so much.

But i cannot enter any text in that.Actually in Combobox,IsEditable is TRUE.
But i cannot enter anything.But this event is working fine.

Anu

Re: Using delegates in vc++

KingsGambit29-Dec-09 22:23

KingsGambit

29-Dec-09 22:23

It seems the delegate expects an argument of type String^ and your function is using CString as argument.

Omit Forward Declaration ?

ekimpl29-Dec-09 21:38

ekimpl

29-Dec-09 21:38

Hi, I am learning C++ right now and I am analysing some VS2008 example of MFC. But I think it's not important in this case.

"modeldlg.h"
class CMainDlg
{
  CAdderDialog* m_pModeless;
}

What I want to ask is, if it is possible to omit forward declaration of CAdderDialog, because it is not present in "modeldlg.h" and somehow it compiles OK. When I try to make the same code on my own, it doesn't compile.

Re: Omit Forward Declaration ?

«_Superman_»29-Dec-09 21:44

«_Superman_»

29-Dec-09 21:44

You will definitely need a forward declaration of the CAdderDialog class since you're creating a pointer of that type.
If you where creating an object of this type you would need to include the entire class definition.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Re: Omit Forward Declaration ?

ekimpl29-Dec-09 21:55

ekimpl

29-Dec-09 21:55

Yes, I think so too. But as I have written it is compiling. Do You have any explanantion why ? Maybe it is some project property ?

Complete file modeldlg.h

// CMainDlg dialog

class CMainDlg : public CDialog
{
// Construction
public:
	CMainDlg(CWnd* pParent = NULL); // standard constructor

	void BoxDone();

// Dialog Data
	//{{AFX_DATA(CMainDlg)
	enum { IDD = IDD_MAIN_DIALOG };
		// NOTE: the ClassWizard will add data members here
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CMainDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	HICON m_hIcon;
	<big>CAdderDialog* m_pModeless;</big>

	// Generated message map functions
	//{{AFX_MSG(CMainDlg)
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	virtual void OnOK();
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
public:
	afx_msg void OnBnClickedOk();
};

Re: Omit Forward Declaration ?

CPallini29-Dec-09 22:15

CPallini

29-Dec-09 22:15

Check well the header(s), I suppose Visual Studio put in place the forward declaration for you (yes, VS does such things...).
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Omit Forward Declaration ?

ekimpl29-Dec-09 22:37

ekimpl

29-Dec-09 22:37

Thanks for the clue. The problem was with include order. Now I know that in i.e. "MyClass.cpp" the "MyClass.h" include should be the last include.

Writing directly on a harddisk without using File

Le@rner29-Dec-09 21:03

Le@rner

29-Dec-09 21:03

Hi all,

How can we write at a given sector in my hard disk?

I have tried it using this code but nothing happens

HANDLE			hFile ;
	DWORD dwResult;


	hFile  = CreateFile (L"\\\\.\\PhysicalDrive3",
					   GENERIC_WRITE,
					   0,                      // do not share
                       NULL,                   // default security
                       CREATE_ALWAYS,          // overwrite existing
                       FILE_ATTRIBUTE_NORMAL,  // normal file
                       NULL);  
	WriteFile (hFile, TEST_STR, strlen(TEST_STR), &dwResult, NULL);

Can anybody help me in this?

Thanks in advance

To accomplish great things, we must not only act, but also dream;
not only plan, but also believe.

Re: Writing directly on a harddisk without using File

Maxwell Chen29-Dec-09 21:09

Maxwell Chen

29-Dec-09 21:09

I wrote some small tool to read and write HDD sectors 6 years ago under WinXP. If I recall correctly, the buffer has to fit the size of a sector (or n folds, aka: N * 512 bytes). Otherwise it rejects and nothing will happen.

Maxwell Chen

Re: Writing directly on a harddisk without using File

raja jamwal31-Dec-09 8:15

raja jamwal

31-Dec-09 8:15

Well unfortunately Windows OS after 2000 or may be NT wouldn't allow you this, check out my post here

http://cyberlifeday.blogspot.com/2009/12/booting-windowslinux-os-any.html

in brief to do same, you'll need to change drive letter to A: or B:, read the post for reason and behind the scenes. Smile | :)

Sharing the socket FD cross process

vikramlinux29-Dec-09 20:44

vikramlinux

29-Dec-09 20:44

Hi All,
Is there any way using which I can share my socket deccripter between multiple processes?

~ Vikram S

Re: Sharing the socket FD cross process

CPallini29-Dec-09 21:30

CPallini

29-Dec-09 21:30

Apparently, yes [^](I never done it).
Smile | :)

AFX_MANAGE_STATE (AfxGetStaticModuleState ()) not working

Karismatic29-Dec-09 19:18

Karismatic

29-Dec-09 19:18

Hi experts,

I have a dll that uses MFC as shared dll and it has many dialogs in it & was working fine till the time the project was in VS 2002 but recently I have converted the VS 2002 project to VS 2008 project and now none of the dialog is showing up. So, could anyone please suggest whats going wrong.

Regards,
Pankaj Sachdeva

There is no future lies in any job but future lies in the person who holds the job

Re: AFX_MANAGE_STATE (AfxGetStaticModuleState ()) not working

KingsGambit29-Dec-09 19:45

KingsGambit

29-Dec-09 19:45

Can you debug an see what is causing the issue?

Re: AFX_MANAGE_STATE (AfxGetStaticModuleState ()) not working

Karismatic29-Dec-09 21:16

Karismatic

29-Dec-09 21:16

DoModal is just returning -1 which means that DoModal is unable to create the dialog.

Regards,
Pankaj Sachdeva

There is no future lies in any job but future lies in the person who holds the job

Re: AFX_MANAGE_STATE (AfxGetStaticModuleState ()) not working

Madhu Nair29-Dec-09 21:43

Madhu Nair

29-Dec-09 21:43

Karismatic wrote:
DoModal is just returning -1 which means that DoModal is unable to create the dialog.

Use GetLastError[^] to check the error code, it may give you some hints, hopefully.

sending wav files using UPD protocol in vc++

janaswamy uday29-Dec-09 18:56

janaswamy uday

29-Dec-09 18:56

Hi all,

I want to transfer a Wave File using UDP. how this is possible. Please give me steps what to follow exaclty. so that the wave file must be transfer to destination machine.

thanks in advance,
uday

Re: sending wav files using UPD protocol in vc++

KingsGambit29-Dec-09 19:55

KingsGambit

29-Dec-09 19:55

Following link might be useful on how to use UDP sockets:
http://msdn.microsoft.com/en-us/library/ms738545(VS.85).aspx[^]

Re: sending wav files using UPD protocol in vc++

raja jamwal31-Dec-09 8:22

raja jamwal

31-Dec-09 8:22

first of all why you going for some file transfer using UDP, if you, then you need to implement something that counts on packets recieved, that would be something like tcp implementation, so why not just go for tcp as transport protocol moreover many ISP aren't good with UDP data transfer, I mean their bandwidth controller goes on dropping lot of UDP packets....
it'll be good if you elaborate your problem...tell you one interesting thing FTP is indeed based on UDP with same as I said above.

Re: sending wav files using UPD protocol in vc++

janaswamy uday1-Jan-10 23:44

janaswamy uday

1-Jan-10 23:44

Its not my Intrest. Client want to Implement in UDP. So i have to go through that.

[Resolved] CButtonST question, Remove the residue of old icon while setting a new icon with SetIcon [modified]

Maxwell Chen29-Dec-09 18:51

Maxwell Chen

29-Dec-09 18:51

I am maintaining the source code which uses CButtonST buttons as icon controls to display transparent and overlay icons (for the small arrow at the corner of the main icon) on the GUI. User can change the icon.

When user is changing the icon, what I do in the code is to invoke CButtonST::SetIcon with another HICON handle. But there is the residue of the old icon which is unwanted. The new icon overlaps on top of the old one.

How to remove the old residue icon? Please advise. Thanks.

According to the comment by the author of CButtonST, calling SetIcon(0, 0) can remove any old icons from it.
[ quote ] // Pass NULL to remove any icon from the button. [ / quote ]
But in fact this call makes the application crash!

[Update]
I found someone had added two lines in CButtonST::FreeResources to do DeleteDC() and DeleteObject(). This issue was caused by these two calls. The problem is fixed after removing them. Big Grin | :-D

Maxwell Chen

modified on Wednesday, December 30, 2009 3:36 AM

Re: CButtonST question, Remove the residue of old icon while setting a new icon with SetIcon

KingsGambit29-Dec-09 19:47

KingsGambit

29-Dec-09 19:47

Can you debug and see why SetIcon(0, 0) fails?

Re: CButtonST question, Remove the residue of old icon while setting a new icon with SetIcon

Maxwell Chen29-Dec-09 20:03

Maxwell Chen

29-Dec-09 20:03

Rejeesh.T.S wrote:
Can you debug and see why SetIcon(0, 0) fails?

There are 3 versions of SetIcon, one is SetIcon(int, int) and the second is SetIcon(HICON, HICON).

I think the compiler links it to SetIcon(int, int) when I wrote SetIcon(NULL, NULL). So I casted it to force it invoke the correct version by SetIcon((HICON)NULL /* second arg has default val */). And it does not crash now.

But there is still old residue icon. I just downloaded the demo source of CButtonST v3.9 from CodeProject, and modified the code to make it change icon dynamically. I do not see it have this problem. And I compared the source code of CButtonST between the demo source and my code. They look the same regarding the icon drawing portion. This is so weird ...

Maxwell Chen

ToolBar in singe document view

Anu_Bala29-Dec-09 18:25

Anu_Bala

29-Dec-09 18:25

Hi,
In my applcaiton i have lot of views.But mainframe should be hided.So i created as single document each view as follow

pGroupViewTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CCentumVPDoc),
		RUNTIME_CLASS(CFrameWnd), 
		RUNTIME_CLASS(CGroupView));
	AddDocTemplate(pGroupViewTemplate);

pGraphViewTemplate = new CSingleDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CCentumVPDoc),
		RUNTIME_CLASS(CFrameWnd), 		 
		RUNTIME_CLASS(CGraphView));
	AddDocTemplate(pGraphViewTemplate);

I wil hide the mainframe window by
pMainFrame->ShowWindow(SW_HIDE/*m_nCmdShow*/);

But now i want toolbars for every view.I dont know where i put the code for getting toolbar.If it is MDI wnidow,then i will put that code in chilframe class.
Mainly to hide mainframe window,i avoid MDI.
What cna i do?

Anu

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.