C / C++ / MFC

Re: Context Menu from the Status Bar..

4-Nov-02 7:45

You could subclass from CStatusBar and handle WM_LBUTTONDOWN and WM_LBUTTONUP.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Anonymous4-Nov-02 7:52

Anonymous

4-Nov-02 7:52

Yeah, I was trying to stay away from that.. I was hopeing to catch a message inside main frame.. I may just create a CStatusBar Class.. It would probably be easier.

Thanks!

Colored Grid

fossilman4-Nov-02 7:15

fossilman

4-Nov-02 7:15

I have a 2d array that I'd like to display in a colored grid. The colors on the grid would be based on the contents of the array. There would be 1 grid square for each point in the array.

Example:

I have int grid_data[ 3 ][ 3 ], I'd want to display a grid like

. . . .
. . . .
. . . .
. . . .

And would like to be able to change the colors of each point easily.

What's the best way to do this?

Thanks

Re: Colored Grid

Bill Wilson4-Nov-02 13:50

Bill Wilson

4-Nov-02 13:50

The easiest way is to use a grid control like MSFlexGrid.

Thanks for the help,
Bill

CHtmlView with Flash not repainting...

Happy_Dog4-Nov-02 7:15

Happy_Dog

4-Nov-02 7:15

I know this is a lot to ask from strangers Smile | :)

but any help would be appreciated. I am currently trying to recreate or modify the program here (this is the source <http://www.installsite.org/files/HTMLautoplaySrc.zip>). It is an executable that is used for launching a html page on a CD automatically (autorun). It reads options from an ini/inf file and opens the htm in a html control. I have at this point managed to recreate the application to about 95% completeness, but I found that mine has the same problem as the original. My htm page that is displayed contains a Flash file (swf) that has buttons with links to other htm/swf pages that are local (on the CD). If you launch one of these pages and it opens over the original window AND you close the new window BEFORE it finishes loading, the original page does not repaint. In other words it just shows white where the window was open over it. This also happens sometimes if you minimize the window then restore it again. If you let the new window load entirely everything works fine most of the time. I need to get this fixed. I am at an intermediate level (mostly self taught) of C++.

Thanks,
Steve

PS. I am willing to supply sample documents if you think it is the htm/swf causing the problem instead of the html control.

Ask about function parameters and pass a reference.

ooosawaddee34-Nov-02 7:02

ooosawaddee3

4-Nov-02 7:02

<br />
	CString m_n, m_e, n_str, e_str; <br />
	int n_strlen, e_strlen;<br />
	UINT k_keyID;<br />
<br />
                m_Proc.GetInfo(FileName, n_str, e_str, n_strlen, e_strlen, k_keyID);<br />
	<br />
                m_n = n_str;<br />
                m_e = e_str;<br />

These above is somepart of my code. m_Proc is object and call function GetInfo which have 5 function parameters (FileName, n_str, e_str, n_strlen, e_strlen, k_keyID)

These below is detail of GetInfo function

<br />
void CExtract::GetInfo(const CString& m_FileName, CString n_str, CString e_str, int n_strlen, int e_strlen, UINT keyID)<br />
	{<br />
n_str ="1234";<br />
e_str = "578756";<br />
n_strlen = 4;<br />
e_strlen = 6;<br />
keyID = 48756;<br />
}<br />

but when I see n_str value after exit GetInfo function. I see n_str = {""}
e_str = {""}

I expect n_str = {"1234"} , e_str = {"578756"}

Do you know how to solve my problem?
Thank you for your answer.

Re: Ask about function parameters and pass a reference.

ian mariano4-Nov-02 7:17

ian mariano

4-Nov-02 7:17

You're passing in parameters by value, which means you can alter them locally (in your function) but they won't be written to. You can use CString& (CString references), and int pointers, so you'd modify your program accordingly:

void CExtract::GetInfo(const CString& m_FileName, CString& n_str, CString& e_str, int* n_strlen, int* e_strlen, UINT* keyID)
{
n_str ="1234";
e_str = "578756";
*n_strlen = 4;
*e_strlen = 6;
*keyID = 48756;
}

//  and calling
m_Proc.GetInfo(FileName, n_str, e_str, &n_strlen, &e_strlen, &k_keyID);

You should probably do checks to make sure no NULL pointers are getting passed in, or just create an info class or structure to use, and pass that back and forth.

"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano - http://www.ian-space.com/

Saving int's, floats, BYTEs to file

Kuniva4-Nov-02 6:46

Kuniva

4-Nov-02 6:46

Hi I know how to save strings to a file using MFC and without MFC (file streams).
But i would like to know how i can save integers and floats and BYTEs and other things like that. I mean,.. i just used to convert them to a string and save them that way but that actually takes up more space in the end so it seems. So how do i save them binary? like... an integer is 4 bytes right? how do i save it to a file so it only takes up 4 bytes? Same for a float..

Thank you.

Kuniva
--------------------------------------------

Ravi Bhavnani4-Nov-02 7:25

4-Nov-02 7:25

3 suggestions: serialize, serialize, serialize. Smile | :)

See this[^] article.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Kuniva4-Nov-02 7:44

Kuniva

4-Nov-02 7:44

Thanks!!!

Great article btw Wink | ;)

Kuniva
--------------------------------------------

Carlos Antollini4-Nov-02 7:41

Carlos Antollini

4-Nov-02 7:41

It's only a sample...

typedef struct 
{
	DWORD Version;
	DWORD QueryPosition;
	DWORD GridPosition;
	DWORD ChartPosition;
	DWORD NotePosition;
	BOOL IsStatic;
}HEADER;

HEADER header;

header.Version = (DWORD)1.0;
header.QueryPosition = 1230;
header.GridPosition = 0;
header.ChartPosition = 0;
header.IsStatic = TRUE;

pFile.Open(strFileName, CFile::typeBinary | CFile::modeCreate | CFile::modeWrite);
pFile.Write(&header, sizeof(HEADER));

Regards

Carlos Antollini.
Pi Five[^]Creator

Sonork ID 100.10529 cantollini

Christian Graus4-Nov-02 9:57

Christian Graus

4-Nov-02 9:57

If you're using file streams, just pass them in

ofstream fs("c:\myfile.txt");
fs << "This is a string " << 42 << 'a' << 9.627;

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

During last 10 years, with invention of VB and similar programming environments, every ill-educated moron became able to develop software. - Alex E. - 12-Sept-2002

how can I debug this?

ns4-Nov-02 6:40

4-Nov-02 6:40

The release version works fine. In the debug version it crashes.

I do this:

POSITION pos = pDoc->GetFirstViewPosition();
while (pos!=NULL)
{
    CDlgLists* pView = (CDlgLists*)(pDoc->GetNextView(pos));
    ASSERT_VALID(pView);

    pView->m_list1.DeleteAllItems();

    pView->PostMessage(WM_COMMAND, IDC_BUTTONHIDEV2,0);
}

Crashes at pView->m_list1.DeleteAllItems(); in

_AFXCMN_INLINE BOOL CListCtrl::DeleteAllItems()
	{ ASSERT(::IsWindow(m_hWnd)); return (BOOL) ::SendMessage(m_hWnd, LVM_DELETEALLITEMS, 0, 0L); }

Why does release work? How can I make the debug work as well?

Appreciate your help,
ns

Andreas Saurwein4-Nov-02 6:41

Andreas Saurwein

4-Nov-02 6:41

ns wrote:
{ ASSERT(::IsWindow(m_hWnd)); return (BOOL) ::SendMessage(m_hWnd, LVM_DELETEALLITEMS, 0, 0L); }

Seems that you dont have a valid window handle there. I would guess that your pView->m_list1 member is not more valid.

In release builds you will send a message to a non-existant window, which is not much of a problem for windows. But in the debug build, the ASSERT() checks for this condition, because obviously something is wrong in your code. Set a breakpoint in the while() loop and check the pView and m_list1 variables.

I keep submitting “VB” as a Priority-1 bug, but apparently no one here knows how to fix it. Nick Hodapp, Semicolon

ns4-Nov-02 7:55

4-Nov-02 7:55

pView was not NULL. But I didnt know how to check to see if m_list1 is Not NULL since it crashes at that line..Is that what I am to do? Hover over m_list1 and see if its something not 0?

Appreciate your help,
ns

Ravi Bhavnani4-Nov-02 7:23

4-Nov-02 7:23

Andreas is right. But to answer the question "How can I make the debug work as well" Smile | :)

here's a suggestion:

Add a public bool m_bInitialized member to your CDlgLists class and set it to false in the view's constructor.
Override CView::OnInitialUpdate() and set m_bInitialized to true.
Modify the problem code to check if m_bInitialized is true before mucking with the view's controls.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

ns4-Nov-02 7:44

4-Nov-02 7:44

Okay. That sounds good. I see that pView is not Null. I just tried:

POSITION pos = pDoc->GetFirstViewPosition();
while (pos!=NULL)
{
    CDlgLists* pView = (CDlgLists*)(pDoc->GetNextView(pos));
    ASSERT_VALID(pView);

    <code>if(NULL != pView->m_list1.GetSafeHwnd())</code>
    {
        pView->m_list1.DeleteAllItems();

        pView->PostMessage(WM_COMMAND, IDC_BUTTONHIDEV2,0);

    }
}

but it still crashes. Now I'll try your idea...

Appreciate your help,
ns

Ravi Bhavnani4-Nov-02 7:46

I am shocked!(pleasantly)

4-Nov-02 7:46

Btw, happy festival of lights. (I think it was yesterday.)

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

ns4-Nov-02 7:53

4-Nov-02 7:53

Your BOOL idea works great! Why didnt my GetSafeHwnd idea work? Isnt it equivalent? Whats the subtle difference between your approach and mine?

Happy Lights to you too! I lose track of these things - though my mom is a real surfer and keeps me informed via email. They have one of those webTV thingies...

Appreciate your help,
ns

Re: I am shocked!(pleasantly)

Ravi Bhavnani4-Nov-02 9:27

4-Nov-02 9:27

You were checking that the view was valid. But the controls within the form view may not get completely set up until the view is shown. OnInitialUpdate() catches the initial display, hence the bool guarantees that all is well.

ns wrote:
They have one of those webTV thingies...
I'm so jealous! I set up my dad with a laptop and internet service, but he's so busy taking care of mom that he has no time to use it. Sad, 'cos he's such a gadget fan and at 83 has the wherewithall of a young man.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

ns4-Nov-02 8:13

4-Nov-02 8:13

I put the BOOL as false in the constructor. How come the constructor runs even if view2 hasnt been spawned yet? I can see that it would get set to TRUE in OnInitDialog(), but at what stage does the constructor run? I have a SwitchView function in my MDI app which either creates if necessary, the view, or else it just switches.

CView*  pView;


POSITION pos;

pos    =   pDoc->GetFirstViewPosition();

while( pos != NULL )
{
    pView = pDoc->GetNextView( pos );

    if( pView->IsKindOf( pViewClass ) )
    {
        pView->GetParentFrame()->ActivateFrame();

        return TRUE;
    }
}


pChild = (CMDIChildWnd*) pTemplate->CreateNewFrame(pDoc, NULL );

Which line runs the constructor?

Another very puzzling fact is that even though I hadnt run SwitchView, pView still came out to be nonNUll in my debugging......pos wasnt NULL....

Appreciate your help,
ns

Ravi Bhavnani4-Nov-02 9:29

4-Nov-02 9:29

The view might be created (constructed) when it's added to the multi doc template. Btw, tell me you meant OnInitialUpdate(), not OnInitDialog(), right? Smile | :)

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com