Confusued

CThreadsView::CThreadsView()
{
// TODO: add construction code here
CFileDialog _FileBox(TRUE,"*.mdb");

ThreadOnOff = FALSE;
_ST = NULL;
GetKeyDBFileValues("KanComm\\DISPLAY",&MyDataName);
MessageBox("Point -1 " + MyDataName);
if ( MyDataName == "" )
{
//if no database open file find
MessageBox(MyDataName);
_FileBox.DoModal();
MyDataName = _FileBox.GetPathName();
}
if ( MyDataName == "" )
{
MessageBox("Cannot create window without a database connection");
return;
}

_PortSettings = "COM2 baud=19200 parity=N data=8";
MyData.Open(MyDataName);
if (!MyData.IsOpen() )
MessageBox("DataBase is not open");
}




I have a question. When I run this code in debug mode it runs right; but when I run it in release mode the MyDataName is set to the proper string, but the condition of [MyDataName ==%2

Well to start with, in C/C++ it's never a good idea to start any variable or function names with an underscore (look up Decorated Names in the help files).

Now your code... have you tried using CString::IsEmpty()?

I've changed all class member variables to begin with m_

CThreadsView::CThreadsView()
{
CFileDialog FileBox(TRUE,"*.mdb");
m_ThreadOnOff = FALSE;
m_ST = NULL;

GetKeyDBFileValues("KanComm\\DISPLAY",&m_MyDataName);

// Assume that the above function returns the correct value

MessageBox("Point -1 " + m_MyDataName);

if ( m_MyDataName.IsEmpty() )
{
//if no database open file find
// MessageBox(MyDataName); // We know it's empty at this point
if (FileBox.DoModal() == IDOK)
{
m_MyDataName = FileBox.GetPathName();
}
else
{
MessageBox("Cannot create window without a database connection");
return;
}
}

m_PortSettings = "COM2 baud=19200 parity=N data=8";

m_MyData.Open(m_MyDataName);

if (!m_MyData.IsOpen() )
MessageBox("DataBase is not open");
}

My other caveat would be that I don't think the constructor is the right place for this... Have you thought about having a public member function CThreadsView::OpenConnection() or something?

Rail

Recording Engineer/Software Developer
Rail Jon Rogut Software
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http://home.earthlink.net/~railro/