Re: Saving data to a file

From:

King Menelaus <menelaus@nowhere.fake>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 22 Apr 2008 11:55:47 -0700

Message-ID:

<ud6dnT5qY84rqZPVnZ2dnUVZ_oWdnZ2d@scnresearch.com>

Indeed. Thanks for the correction.

-JJ

AliR (VC++ MVP) wrote:

In a CByteArray GetData returns a BYTE * which can be implicitly casted to a
void *.

AliR.

"King Menelaus" <menelaus@nowhere.fake> wrote in message
news:wpmdnfWYJpagt5PVnZ2dnUVZ_jednZ2d@scnresearch.com...

Write() wants a pointer to a buffer. GetData() returns a pointer to an
array of pointers. You need to be more specific about which buffer in the
array of buffers you wish to write out.

-JJ

Kahlua wrote:

Oops,

The line the error points to is:
if(out.Write(buffer.GetData(), buffer.GetSize()) != buffer.GetSize()){

Thanks,
Ed

"Joseph M. Newcomer" <newcomer@flounder.com> wrote in message
news:rt6s04dcaakqnaafiqmv6ail311l1vg5pp@4ax.com...

It would be a great help if we knew what line it occurs on! Adding a
comment like

// <== line 854

would go a long way to helping us understand what is going on here.

Offhand I don't see anything in this code that would generate that
error.
joe
On Tue, 22 Apr 2008 16:23:04 GMT, "Kahlua" <kahlua@right.here> wrote:

When I build this I get the following error:
C:\MyProjects\MyDlg.cpp(854) : error C2120: 'void' illegal with all
types
Never seen this error before.
Thanks for all the help here so far.

void CMyDlg::OnClickhere()
{
CByteArray buffer;
CFile out;

for (int i=0; i<20; i++) //just inserting some binary test data to
buffer
   buffer.InsertAt(i, 0x05);

if(out.Write(buffer.GetData(), buffer.GetSize()) != buffer.GetSize()){
   DWORD err = ::GetLastError();
   CString msg;
   msg.Format(_T("Error writing file: %d"), err);
   AfxMessageBox(msg);
   return;
}
out.Close();
}

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm