C / C++ / MFC

24-Nov-05 14:19

Hello everyone! Big Grin | :-D

OK, simple question... How can I read the contents of a file? I got the ReadFile() function, but none of it's parameters is a string! Does anyone know? Thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

PJ Arends24-Nov-05 16:26

PJ Arends

24-Nov-05 16:26

The second parameter can be used as a string. It is an LPVOID, so you can easily pass a char* pointer there.

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Lord Kixdemp25-Nov-05 22:14

25-Nov-05 22:14

Yeah... thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

ThatsAlok29-Nov-05 1:09

ThatsAlok

29-Nov-05 1:09

Kixdemp wrote:
How can I read the contents of a file? I got the ReadFile() function, but none of it's parameters is a string! Does anyone know?

if it normal text file... better use CStdioFile class

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VC Forum Q&A :- I/ IV

Lord Kixdemp29-Nov-05 8:50

How to transfer the filename defined as CString in CreateProcess to load the specified file

29-Nov-05 8:50

Hmm... didn't know of that... But I'll try it! Thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

greenwyx24-Nov-05 14:03

greenwyx

24-Nov-05 14:03

I use the CreateProcess() in VC.At frist, I defined a CString to get the filepath and filename.for example :
CString SelectedFile;
CFileDialog FileDialogBox(TRUE,NULL,"*.dxf",OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,szFileFilter,this);
if(FileDialogBox.DoModal()==IDOK)
{
SelectedFile=FileDialogBox.GetPathName();
}
Then in the CreateProcess() ,I want to run another programmer called "draw.exe".
My question is ,how the CreateProcess() get the value of SelectedFile when run the "draw.exe".
My purpuse is specifying the filepath and filename fristly ,and runing the "draw.exe" to load it.
Thank you

Re: How to transfer the filename defined as CString in CreateProcess to load the specified file

PJ Arends24-Nov-05 16:29

PJ Arends

24-Nov-05 16:29

Pass SelectedFile as the second parameter.

CreateFile("draw.exe", SelectedFile, ...);

Re: How to transfer the filename defined as CString in CreateProcess to load the specified file

greenwyx27-Nov-05 15:00

greenwyx

27-Nov-05 15:00

Thank you for your help.
I have worked it out.The second parameter shuould turn to the (LPSTR)type. So it may be (LPSTR)(LPCTSTR)SelectedFile.
Thank you.

Compiling generated code?

Lord Kixdemp24-Nov-05 11:26

24-Nov-05 11:26

Hello everyone! Big Grin | :-D

OK, I finally tried the VC++ 2003 Everett I had in my closet and it worked! Big Grin | :-D

I want to make a program now, but it requires code generation... I know how to do the code, but how do I compile it? In C# we used the CodeDom class if I remember correctly and it compiled it for us, but how do I do it in MFC? Thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

Christian Graus24-Nov-05 11:51

Christian Graus

24-Nov-05 11:51

You can't. Any machine that runs .NET has a compiler in the framework. That is not true of C++, which compiles to native code.

Christian Graus - Microsoft MVP - C++

Lord Kixdemp24-Nov-05 11:57

24-Nov-05 11:57

Hmm... Is there any reliable compiler that I can use and is small? Thanks! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

Christian Graus24-Nov-05 11:58

Christian Graus

24-Nov-05 11:58

It just plain does not work that way. You could try to use gcc if you're compiling standard C++, but I'd say that your best option is to use C++/CLI and then use .NET to generate code on the fly.

Christian Graus - Microsoft MVP - C++

Lord Kixdemp24-Nov-05 12:23

24-Nov-05 12:23

Hmm... no, I can't use .NET... Do you know what are the basic GCC files that I need? It's like 140 MB... Frown | :(

Thanks!

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

Christian Graus24-Nov-05 12:26

Christian Graus

24-Nov-05 12:26

My overall opinion is that you're screwed here. I have no idea what GCC files you need, and once you have them, they will create an exe that you can run. You're not going to be able to compile code within the process that you're running.

Christian Graus - Microsoft MVP - C++

Lord Kixdemp24-Nov-05 14:17

24-Nov-05 14:17

Yeah, I'll stop working on that then... Confused | :confused:

Thanks anyways! Wink | ;-)

Lord Kixdemp
www.SulfurMidis.com
www.SulfurSoft.tk
[ftp://][http://][hotline://]tsfc.ath.cx

CEdit

LeeeNN24-Nov-05 10:37

LeeeNN

24-Nov-05 10:37

How many characters can a CEdit Control can obtain. In my App if I keep store data into CEdit, Cedit won't display data after a certain amount of time.

Thanks

BadKarma24-Nov-05 11:17

BadKarma

24-Nov-05 11:17

Hi
Because the usage of DDX conversion to CString the edit box has the same limitations.
I have read somewhere that this would be around 30.000 byte in VC6.0 . I'm not 100% certain if this is true or if this limitation still stands in VC7.1 or VC8.0

You could probably load more data into an window without the usage of DDX functions or CString values.

codito ergo sum

LeeeNN24-Nov-05 18:56

LeeeNN

24-Nov-05 18:56

Thank you for you replay. How could I use a CEdit control without DDX?
I use
m_pEdit->SetSel( -1, -1 ); // curser to text end
m_pEdit->Replace( strAddedText );

It displays for a while, then stucked.

Any solution?

BadKarma24-Nov-05 22:22

BadKarma

24-Nov-05 22:22

Hi,

you've got to do it the hard way, dont use CString use a char buffer to access the edit box.
But char buffers are a very hard way to deal with strings so it would be better to use the std::string class. (this requires #include <string>
You will need to get the text from the control then append your extra data and next send the text back to the control. To simplefy this I wrote 2 wrapper funtions SetText and GetText. This gives the following code:

std::string CMyDlg::GetText(UINT uiControl)
{
  //
  //	Get Window to the control
  //
  CWnd* pWnd = GetDlgItem(uiControl);
	
  if(pWnd)
  {
    std::string sTemp;

    //
    //  Get Text length and allocate buffer - the hard way :)
    //
    int iLen = pWnd->GetWindowTextLength();
    char* pBuffer = new char[iLen+1];
		
    //
    //	Get text and assing to string
    //
    pWnd->GetWindowText(pBuffer, iLen+1);		
    sTemp.assign(pBuffer, iLen);

    //
    //  Release the buffer
    //		
    delete pBuffer;

    return sTemp;
  }
  return "";
}

void CMyDlg::SetText(UINT uiControl, std::string sText)
{
  //
  //	Get Window to the control
  //
  CWnd* pWnd = GetDlgItem(uiControl);

  if(pWnd)
  {
    pWnd->SetWindowText(sText.data());
  }
}

void CMyDlg::AddText(std::string sAdd)
{
  std::string sText = GetText(IDC_MY_EDIT);
  sText += sAdd;
  SetText(IDC_MY_EDIT, sText);
}

This should work ...

codito ergo sum