Re: CString + OPENFILENAME - C / C++ / MFC Discussion Boards

thangvel6-Oct-09 21:26

6-Oct-09 21:26

hai everybody,
please anyone tell me How to create a MS ACESS database file and add table on it during run time in a dialog based application using VC++ 6.0 ......?

thank u........ Rose | [Rose]

CString + OPENFILENAME

raviteja20206-Oct-09 21:18

raviteja2020

6-Oct-09 21:18

Hi,
The project I'm working on requires to open a bitmap image from a location, display it and then save the image at another location. In this project I use a variable in OnFileSave As Dlg as OPENFILENAME type.
But, I have already used the same variable during file open dialog as a CString type.
The problem is: I need to use the same variable for both the dialogs.
Plzz suggest a variable type that has the features of both CString and OPENFILENAME or any other alternate solution.
Thank you in advance.

Re: CString + OPENFILENAME

CPallini6-Oct-09 21:25

CPallini

6-Oct-09 21:25

raviteja2020 wrote:
The project I'm working on requires to open a bitmap image from a location, display it and then save the image at another location.

That's fine: your requirements are clear.

raviteja2020 wrote:
In this project I use a variable in OnFileSave As Dlg as OPENFILENAME type.

What does it mean, exactly?

raviteja2020 wrote:
But, I have already used the same variable during file open dialog as a CString type.

You...What?

raviteja2020 wrote:
The problem is: I need to use the same variable for both the dialogs.

Usually this can be done.

raviteja2020 wrote:
Plzz suggest a variable type that has the features of both CString and OPENFILENAME or any other alternate solution.

I would go with the 'alternate solution'. Anyway you should give us meaningful details.
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: CString + OPENFILENAME

raviteja20206-Oct-09 22:46

raviteja2020

6-Oct-09 22:46

CPallini wrote:

raviteja2020 wrote:
In this project I use a variable in OnFileSave As Dlg as OPENFILENAME type.

What does it mean, exactly?

I used a variable named m_imgName in the OnFileSaveAs() Dialog. the variable is of type OPENFILENAME.

CPallini wrote:

raviteja2020 wrote:
But, I have already used the same variable during file open dialog as a CString type.

You...What?

I have used same variable name in another dialog OnFileOpen(). In this dialog the variable is of type CString.

Now the problem is, I would like to declare a public variable so that it can do the work of both the variable types.
So I need a variable type as a combination of CString and OPENFILENAME.

Re: CString + OPENFILENAME

CPallini6-Oct-09 22:51

CPallini

6-Oct-09 22:51

raviteja2020 wrote:
Now the problem is, I would like to declare a public variable so that it can do the work of both the variable types.
So I need a variable type as a combination of CString and OPENFILENAME.

Nope. You don't need that. You may share, for instance, the CString object (and make it interact properly with the OPENFILENAME struct).

Could you please post the relevant code?
Smile | :)

Re: CString + OPENFILENAME

raviteja20206-Oct-09 23:03

raviteja2020

6-Oct-09 23:03

Initial declaration of the variable:
CString     m_imgName;

Using the variables in both dialogs
<pre>
void CSockDlg::OnFileOpen()
{
     CFileDialog m_ldFile(TRUE, m_imgName, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, szFilter);
     if (m_ldFile.DoModal() == IDOK)
     {
          m_imgName = m_ldFile.GetFileName();
          UpdateData(FALSE);
     }
}

void CSockDlg::OnFileSaveAs(HWND hWnd)
{
     OPENFILENAME m_imgName;
     TCHAR szPath[MAX_PATH];
     TCHAR szFile[MAX_PATH];
     ZeroMemory( &m_imgName, sizeof(OPENFILENAME) );
     m_imgName.lStructSize = sizeof(OPENFILENAME);

     szFile[0] = '\0';
     m_imgName.hwndOwner = hWnd;
     m_imgName.lpstrFile = szFile;
     m_imgName.nMaxFile = sizeof(szFile)/sizeof(*szFile);
     if (1)
     {
          m_imgName.lpstrInitialDir = szPath;
     }
     if ( GetSaveFileName( &m_imgName ) == TRUE )
     {
     }
     else
     {
     }
}

</pre>
Here I've declared the variable again in th OnFileSaveAs() so that my project runs temporarily.
I'll have to remove the declaration from the dialog and have to declare a public variable.
Thank you

Re: CString + OPENFILENAME

Richard MacCutchan6-Oct-09 23:19

Richard MacCutchan

6-Oct-09 23:19

I cannot quite figure out what you are trying to achieve here but you cannot use a single variable as two different types. If you need to share some information that is held in the OPENFILENAME structure, then just make that structure the public variable.

Re: CString + OPENFILENAME

CPallini6-Oct-09 23:29

CPallini

6-Oct-09 23:29

void CSockDlg::OnFileSaveAs(HWND hWnd)
{
     OPENFILENAME ofn;
     TCHAR szPath[MAX_PATH];
     TCHAR szFile[MAX_PATH];
     ZeroMemory( &amp;ofn, sizeof(ofn) );
     m_imgName.lStructSize = sizeof(ofn);

     szFile[0] = '\0';
     ofn.hwndOwner = hWnd;
     ofn.lpstrFile = szFile;
     ofn.nMaxFile = sizeof(szFile)/sizeof(szFile[0]);
     ofn.lpstrInitialDir = szPath;
     if ( GetSaveFileName( &ofn ) == TRUE )
     {
       // here set properly m_imgName
       // BTW: why don't you used CFileDialog instead of GetSaveFileName?
     }
     else
     {
     }
}

raviteja2020 wrote:
Here I've declared the variable again in th OnFileSaveAs() so that my project runs temporarily.
I'll have to remove the declaration from the dialog and have to declare a public variable.

Variable m_imgName doesn't need to be declared public (needs to be a class member, not a local variable), as it is used in its owner class code.
Smile | :)

Re: CString + OPENFILENAME

Stuart Dootson6-Oct-09 21:28

Stuart Dootson

6-Oct-09 21:28

raviteja2020 wrote:
same variable

Same variable? Or same variable name? Illustrate what you mean with code, please.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: CString + OPENFILENAME

KarstenK6-Oct-09 21:52

KarstenK

6-Oct-09 21:52

At first learn to clearly describe the problem. This is really often half of the solution. Blush | :O

Press F1 for help or google it.
Greetings from Germany

Re: CString + OPENFILENAME

David Crow7-Oct-09 3:33

David Crow

7-Oct-09 3:33

Why are you using a CFileDialog object for opening and GetSaveFileName() for saving?

As far as your question goes, consider:

int x = 5;
  
void main( void )
{
    int x = 10;
    cout << x; // what do you suppose this prints?
}

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

ratprita6-Oct-09 20:33

ratprita

6-Oct-09 20:33

Anyone know the code for creating a file using CreateFile(), Writing the listbox contents into the file using WriteFile() and reading the contents of the file into a listbox using ReadFile() ?

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

Michael Schubert6-Oct-09 20:41

Michael Schubert

6-Oct-09 20:41

I suggest the documentation for these functions on MSDN.

Go to http://msdn.microsoft.com/en-us/library/default.aspx[^] and type the name of the function in the search box.

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

goonyangxiaofang6-Oct-09 20:41

goonyangxiaofang

6-Oct-09 20:41

You can find your answer in MSDN.

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

ratprita6-Oct-09 21:22

ratprita

6-Oct-09 21:22

I need code urgently. Pls help.

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

CPallini6-Oct-09 21:25

CPallini

6-Oct-09 21:25

ratprita wrote:
I need code urgently.

BTW: its a quite simple task and you're a developer, aren't you? The documentation is your best friend.
Smile | :)

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

Richard MacCutchan6-Oct-09 23:22

Richard MacCutchan

6-Oct-09 23:22

ratprita wrote:
I need code urgently.

Then why not go and look for it? It's all here[^].

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

CPallini6-Oct-09 21:20

CPallini

6-Oct-09 21:20

Yes.

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

KarstenK6-Oct-09 21:55

KarstenK

6-Oct-09 21:55

you are fullfilling most conditions of bad questioning in forums. D'Oh! | :doh:

tip: listbox <-> string <-> file

Do your homework by reading the docs (aka RTFM)

SCNR

Press F1 for help or google it.
Greetings from Germany

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

Rajesh R Subramanian6-Oct-09 22:03

Rajesh R Subramanian

6-Oct-09 22:03

A list box or an edit box? A list box is not some sort of a "text container" that you can dump text into. So, you'll have to do a bit of work (parse entries and add it to the list box).

I'm sure all those functions are documented and there are plenty of examples out there. Not to mention if you're using MFC, things will be easier.

It is a crappy thing, but it's life -^ Carlo Pallini

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

wangningyu6-Oct-09 22:34

wangningyu

6-Oct-09 22:34

you can use struct.

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

Michael Schubert6-Oct-09 22:44

Michael Schubert

6-Oct-09 22:44

wangningyu wrote:
you can use struct.

That is about as useful as telling him to use butter and cheese.

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

Iain Clarke, Warrior Programmer6-Oct-09 23:03

Iain Clarke, Warrior Programmer

6-Oct-09 23:03

At least your suggestion leads to a sandwich. Mmmm, food...

Iain.

I have now moved to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), or need contract work done, give me a job! http://cv.imcsoft.co.uk/[^]

Re: Usage of Win32APIs CreateFile(),WriteFile() and ReadFile()

CPallini6-Oct-09 23:44

CPallini

6-Oct-09 23:44

Michael Schubert wrote:
That is about as useful as telling him to use butter and cheese.

I guess butter & cheese are more useful. Big Grin | :-D

increment decrement in C++

hrishiS6-Oct-09 20:18

hrishiS

6-Oct-09 20:18

Hi to All,

Here is a question i came across , but could not find an answer,Could anyone please tell me the reason

output of the line

printf("%d %d %d",++i,i++,++i);

according to me it should be 3,1,1 (since, when the control comes to the third(right to left)incrementation ,the value of i is 2,...and since its a preincrement, it should give a result 3...and at last since printf is based on stack....results will pop out like 3,1,1....

But its showing 2, 1, 1
also when I tried with
printf("%d %d %d",++i,i,++i);
it still shows 2, 1, 1

why so?

-----------------------------
I am a beginner

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