C / C++ / MFC Discussion Boards

Re: Help!

josip cagalj17-Jun-07 22:31

josip cagalj

17-Jun-07 22:31

Thx!

Re: Help!

Hamid_RT17-Jun-07 22:29

Hamid_RT

17-Jun-07 22:29

Is that your program or you run a foreign program?

WhiteSky

Re: Help!

Naveen18-Jun-07 0:10

Naveen

18-Jun-07 0:10

GetCurrentDirectory() ..?

nave

[OpenedFileFinder]

Update text on one form from another form

braune17-Jun-07 21:44

braune

17-Jun-07 21:44

I have a program that displays a dialog box with a series of buttons and a text box for messages. When I select one of the buttons it creates an instance of a module that interfaces to some USB tools. Sometimes the work done by this interface module can take sometime to complete and I would like the interface module to update the text box on the dialog box. Is there an easy way to do this? I am using VC++ 6.0.

Eric

Re: Update text on one form from another form

Nelek17-Jun-07 21:51

Nelek

17-Jun-07 21:51

Hi,

you can set a control variable associated with the control you want to update, and then access them through a pointer to the window/dialog that has the ownership of those controls.

As example (In one of my programms):
Form3 has some buttons (m_cbBut1, m_cbBut2) and Form2 has a graphic (m_gGraph1). In Form3 I have a pointer to the Form2 (CFormView* m_pForm2).

When I use some of the buttons I put in the message OnButtonXClick something like:

OnClick ()
{
//some code
m_pForm2->m_gGraph1->Update (); //I make the update of my graphic
m_pForm2->m_cbBut1F2->ShowWindow (FALSE); //I make invisible a button near the graphic.
//some code
return;
}

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Update text on one form from another form

braune17-Jun-07 23:08

braune

17-Jun-07 23:08

How did you arrive with m_pForm2? I am using Dialog instead of Form, would that make a difference? I can not seem to get my control variables to show up.

Eric

Re: Update text on one form from another form

kanduripavan17-Jun-07 23:15

kanduripavan

17-Jun-07 23:15

hi,
have a CClass* (of the class where u have to update) as a dialog box member.
Before calling DoModal update this pointer and rest handle with the pointer.
Try it.Lets see .

Have a nice day

Re: Update text on one form from another form

Nelek17-Jun-07 23:24

Nelek

17-Jun-07 23:24

I have made it by using the View List of CDocument, because the form is connected to the document through a pDocTemplate. But the principe is the same.

You can take a pointer to your dialog, by taking the handler of the window that contains the dialog in you OnInitDialog and recasting it to a CDialog*...

Or another possibility is to use the moment you create the dialog to take the pointer.

For example:
//Instead of this...
CDialog newDlg;
int nAnswer = newDlg.DoModal ();
//...

//
//Use this
//
CDialog* m_pOpenedDialog; //Variable to get the connection to the dialog

CDialog* newDlg;
//here send the pointer to a variable in the other window to connect with
m_pOpenedDialog = newDlg;
int nAnswer = newDlg->DoModal ();

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Update text on one form from another form

braune18-Jun-07 4:52

braune

18-Jun-07 4:52

Maybe I am not explaining this correctly or do not not understand your solution. I will try to explain with example:
When I click on a button in my main form (CUsbDlg) it run the following:

void CUsbDlg::OnFormatBlock0()
{
CUsbIo cUsb;

//Setup the usb communication (load the bix file)
if(!cUsb.CommunicationSetup())

The problem is that I need cUsb to update a Static text box on the CUsbDlg form. There are items that happen within the CommunicationSetup that may take some time. I need to let the user know where we are in the process.

Eric

Re: Update text on one form from another form

David Crow18-Jun-07 8:41

David Crow

18-Jun-07 8:41

braune wrote:
The problem is that I need cUsb to update a Static text box on the CUsbDlg form.

Ok, so what's the problem? One way to achieve what you want is to have the CUsbIo class post messages back to CUsbDlg. In the handler for those messages, update the static controls.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

abort error dbcore.cpp

neha.agarwal2717-Jun-07 21:43

neha.agarwal27

17-Jun-07 21:43

Hello all,
I am trying to read excel file through my code.i have used CRecordSet class for that, but when i m trying to use Open function and passing null in place of sql; statement is give abort error dbcore.cpp. How to solve it....
can anybody please help me in this

Thanks in advance

Re: abort error dbcore.cpp

Hamid_RT17-Jun-07 22:36

Hamid_RT

17-Jun-07 22:36

See CSpreadSheet - A Class to Read and Write to Excel and Text Delimited Spreadsheet[^] for read & write to Excel.

WhiteSky

Re: abort error dbcore.cpp

neha.agarwal2717-Jun-07 23:25

neha.agarwal27

17-Jun-07 23:25

I was trying in this example only. There is a open function in this example
which opens the connection

m_sSql.Format("SELECT * FROM [%s$A1:IV65536]", m_sSheetName);
try
{
  m_rSheet->Open(CRecordset::forwardOnly, m_sSql, CRecordset::readOnly);
}

here in try block it passes m_sSql (sql command).
when i pass NULL instead of sql command it gives abort error.

Acutally i m trying to read my excel sheet without using sql command...

Re: abort error dbcore.cpp

David Crow18-Jun-07 3:12

David Crow

18-Jun-07 3:12

neha.agarwal27 wrote:
...give abort error dbcore.cpp.

Are you referring to an assertion?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Zip/Archive

Jai Praful Ved17-Jun-07 21:43

Jai Praful Ved

17-Jun-07 21:43

Hi there !!

I would like to seek some help to understand if there are direct Windows API (C++) to create a zip file from multiple files.

I have a set of files which i want to package into one zip file programmatically.

Please let me know what is the best possible way to to get this done.

Thanks and Regards,
Jai Praful Ved

Re: Zip/Archive

karle17-Jun-07 22:27

karle

17-Jun-07 22:27

As far as I know there is no windows API support for handling ZIP files.
Windows just supports cab files.

I you want to process zip files from c++ you should zlib which is free.
Just google for "zlib" or see
<http: en.wikipedia.org="" wiki="" zlib="">

Re: Zip/Archive

Jai Praful Ved17-Jun-07 23:21

Jai Praful Ved

17-Jun-07 23:21

Will I be able to use zlib library to make a package out of a number of files into one zip file ?

Let me give you some details. I have a set of files and folders with data. I want to programmatically package these files and folders into a single zip file. The zlib works for buffers and I have a set of files and folders to work with......

Please guide me !!

Regards,
Jai Praful Ved

Re: Zip/Archive

Hamid_RT17-Jun-07 22:32

Hamid_RT

17-Jun-07 22:32

See LiteZip and LiteUnzip[^]
Zip and Unzip in the MFC way
[^]
XZip and XUnzip - Add zip and/or unzip to your app with no extra .lib or .dll[^]

WhiteSky

dialog box derived from CWnd class

prithaa17-Jun-07 21:40

prithaa

17-Jun-07 21:40

Hello,

I have derived a class from CWnd to make a dialog box.I was not able to derive a class from CDialog since it needed a dialog resource ID which I don't have.So I derived a class from CWnd .
But how do I make the window behave like a dialog where the user will not be able to activate any other window before closing this window(dialog).

Thanks
Prithaa

Re: dialog box derived from CWnd class

Nelek17-Jun-07 21:57

Nelek

17-Jun-07 21:57

If you need Dialog behaviour, it will be better if you derive from CDialog. The ID is automatically set by the assistant if you are using it, but you can set it dinamically too. Take a look to the function (VC++ 6 help quote)

CDialog::CreateIndirect ():
Creates a modeless dialog box from a dialog-box template in memory (not resource-based).

CDialog::InitModalIndirect ():
Creates a modal dialog box from a dialog-box template in memory (not resource-based). The parameters are stored until the function DoModal is called.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: dialog box derived from CWnd class

prithaa17-Jun-07 22:43

prithaa

17-Jun-07 22:43

Thanks Nelek

So do you mean that I can derive a class from CDialog without any resource template and call the function InitModalIndirect().But this function requires lpDialogTemplate, so I should make that structure and add the windows
controls as I want them in the class.

Will it be that simple?

Pritha

Re: dialog box derived from CWnd class

Nelek17-Jun-07 23:25

Nelek

17-Jun-07 23:25

It should, but I can not say it will Wink | ;)

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: dialog box derived from CWnd class

prithaa18-Jun-07 0:16

prithaa

18-Jun-07 0:16

Thanks Nelek

I will try that.

Prithaa
Bye

Re: dialog box derived from CWnd class

Nelek18-Jun-07 4:13

Nelek

18-Jun-07 4:13

Just one thing more, as well you should try to write new messages with new questions... if it is something related with this... please tell me here about the new message, I will have a email if something is added to this post. It is to avoid not reading a message related Smile | :)

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Linkage of local static variables in inline member function

Stephen Boissiere17-Jun-07 21:35

Stephen Boissiere

17-Jun-07 21:35

Hi, I recently posted an article (http://www.codeproject.com/useritems/VC2003MeyersSingletonBug.asp) and one of the comments raised a question that I cannot find a definitive answer for. I'm hoping somebody can help here. The question is:

In C++, if an inline class member function that contains a local static variable is included in a header which is included in more than one CPP file, does the linker garuantee that the static variable is treated as a single instance?

So in foo.h:

class foo
{
public:
    int bar()
    {
        static int i = 0;
        ++i;
        return i;
    }
};

And in fooA.cpp:

#include "foo.h"
extern void fooB();
int main()
{
    foo f;
    printf ( "%i", f.bar());
    fooB();
    return 0;
};

And in fooB.cpp:

#include "foo.h"
void fooB()
{
    foo f;
    printf ( "%i", f.bar());
};

Should I get the output:

Or:

BTW, I know what actually happens in my similar real code - I get "12" which is what I expect. But I'd like to know if this is C++ standard behaviour, undefined in the standard or just an MS compiler quirk. Thanks for reading.

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