VS 2005 C++ edit content of the CRichEditCtrl instance - c++

Question

I've installed a Windows XP Professional SP3 on a VMWare image and the Visual Studio 2005 on it. I've created a new dialog based C++ MFC project with /clr support. I've put a RichEdit 2.0 control onto the auto-generated dialog and I'm trying to read up a text file and put its content into this RichEdit 2.0 control by button click without formatting. I've added a variable to the RichEdit 2.0 called pCRichEditCtrl and here is my code which doesn't work.
CWinApp inheritance:
BOOL CTextFormatterApp::InitInstance()
{
...
AfxInitRichEdit2();
CWinApp::InitInstance();
...
}
CDialog inheritance:
void CTextFormatterDlg::OnBnClickedButton1()
{
StreamReader^ objReader = gcnew StreamReader("c:\\text.txt");
String ^sLine = "";
sLine = objReader->ReadLine();
while (sLine != nullptr)
{
pCRichEditCtrl.SetSel(pCRichEditCtrl.GetTextLength(), -1);
pCRichEditCtrl.ReplaceSel(CString(sLine));
sLine = objReader->ReadLine();
}
objReader->Close();
}
I don't know whether it counts but I get the following warnings at linking:
TextFormatterDlg.obj : warning LNK4248: unresolved typeref token (01000016) for 'AFX_CMDHANDLERINFO'; image may not run
TextFormatter.obj : warning LNK4248: unresolved typeref token (01000012) for 'AFX_CMDHANDLERINFO'; image may not run
TextFormatterDlg.obj : warning LNK4248: unresolved typeref token (01000015) for 'IAccessibleProxy'; image may not run
I'm not sure what I'm doing because I'm familiar only with newer frameworks and I don't know either Windows.
Input file exists, I can see the read text if I debug the application but I can't see any changes in the edit box. I've tried to call pCRichEditCtrl.UpdateData(true); but nothing has changed.
Is it enough to add a variable for getting the controller of the box (pCRichEditCtrl)? It seems to the pointer doesn't point to the proper control item.
Do you have any idea what is missing?

Answer 1

There's no need to use CLI to just read text files, try something like:
void CTextFormatterDlg::OnBnClickedButton1()
{ CStdioFile f1;
CString sLine;
if (!f1.Open(_T("c:\\text.txt"), CFile::modeRead | CFile::typeText))
return;
while (f1.ReadString(sLine))
{ pCRichEditCtrl.SetSel(pCRichEditCtrl.GetTextLength(), -1);
pCRichEditCtrl.ReplaceSel(sLine);
}
f1.Close();
}
EDIT: control variable pCRichEditCtrl
a) should be declared in the dialog class as CRichEditCtrl pCRichEditCtrl;
b) should be connected to the ID of the control (e.g.: IDC_RICHEDIT21), like
void CTextFormatterDlg::DoDataExchange(CDataExchange* pDX)
{ CDialogEx::DoDataExchange(pDX);
DDX_Control(pDX, IDC_RICHEDIT21, pCRichEditCtrl);
}
c) I have tested the following code and it works for me (adds "aa" to the control window on each button click)
pCRichEditCtrl.SetSel(pCRichEditCtrl.GetTextLength(), -1);
pCRichEditCtrl.ReplaceSel(TEXT("aa"));

Answer 2

I share the final solution with the community to be available for those who faces with the same issue. I don't know why do I have to use Update(FALSE); on the CWinApp inheritance two times but it solves everything. If someone has an idea or a better (nicer) solution don't hesitate to share it with us, I'll move the accepted flag to that version (if it is possible, I haven't tried it before).
void CTextFormatterDlg::OnBnClickedButton1()
{
StreamReader^ objReader = gcnew StreamReader("c:\\text.txt");
String ^sLine = objReader->ReadLine();
UpdateData(FALSE); //this is the first unexpected first aid
while (sLine != nullptr)
{
pCRichEditCtrl.SetSel(pCRichEditCtrl.GetTextLength(), -1);
pCRichEditCtrl.ReplaceSel(CString(sLine + "\r\n"));
UpdateData(FALSE); //this is the second unexpected first aid
sLine = objReader->ReadLine();
}
objReader->Close();
}