i have a problem with csv file reading. I'm pretty new to mfc and i hope someone can help me. So...i have a button and with it i open file dialog and choose csv file. In csv file i have diferent shapes(rectangle,ellipse,pollygon) with color and position info(separtor is ;). Now i need to show this informations in a ListBox and here i'm stuck. I got so far(code)...and i don't know it's ok and i can't find any good help so i hope someone can give me a hint.
void CDialogDrawing::OnBnClickedButton2()
{
TCHAR filtri[] = _T("CSV files (*.csv)|*.csv||");
CString path;
CFileDialog dlg(TRUE, _T("csv"), _T("*.csv"), OFN_FILEMUSTEXIST | OFN_HIDEREADONLY, filtri);
dlg.m_ofn.lpstrTitle = _T("Open...");
if(dlg.DoModal() == IDOK) //OK
{
path = dlg.GetPathName();
//
CStdioFile readFile;
CFileException fileException;
CString strLine;
if(readFile.Open(path, CFile::modeRead, &fileException))
{
while (readFile.ReadString(strLine));
{
seznamLikov.AddString(strLine);
}
}
else
{
CString strErrorMsg;
strErrorMsg.Format(_T("Can't open file %s , error : %u"), path, fileException.m_cause);
AfxMessageBox(strErrorMsg);
}
readFile.Close();
}
}
Trailing semi-colon after the while:
while (readFile.ReadString(strLine));
{
seznamLikov.AddString(strLine);
}
remove it as it is equivalent to:
while (readFile.ReadString(strLine)) {}
{
seznamLikov.AddString(strLine);
}
meaning AddString() will be invoked only once, after ReadString() fails.
Related
I'm trying to serialize a listbox in MFC.
I used this code :
CFileDialog fileDlg(FALSE, _T(".txt"), NULL, 0, _T("Text File (.txt)|*.txt|")
_T("All files (*.*)|*.*||"));
if (fileDlg.DoModal() == IDOK)
{
const int numItems = m_listBox.GetCount();
CString itemText;
CStdioFile file;
if (file.Open(fileDlg.GetFileName(), CStdioFile::modeCreate | CStdioFile::modeWrite))
{
for (int i = 0; i < numItems; ++i)
{
m_listBox.GetText(i, itemText);
file.WriteString(itemText);
file.WriteString(_T("\n"));
}
file.Close();
}
But the saved file is always empty.
I tried a lot of versions of functions that save from listbox to text file but it didn't work.
In your code you are using CFileDialog::GetFileName. Is that intentional? That will only pass in the file name.
I would use CFileDialog::GetPathName which returns the full path to the file.
And you should be using a debugger (compile in debug mode) so you can walk your code.
The CStdioFile::Open method can also be passed a pointer to an exception object. Have a look at the help.
I want to list all my files and folders (include sub-folders) and show it into my list box so I think about writing a recursive function to display them. But the code work well if I show all files and folders in the selecting folder, but it can not scan in sub-folders (it show only the first folder and no more). Please help me to know what is the error?
This is my function (I add it into my Dialog class)
void CFileListingDlg::ListFile(CString path)
{
CFileFind hFile;
BOOL bFound;
CString filePath;
bFound=hFile.FindFile(path+L"\\*.*");
while(bFound)
{
bFound=hFile.FindNextFile();
if(!hFile.IsDots())
{
m_lFiles.AddString(hFile.GetFilePath());
//It work well with selecting folder if I remove this line
//But it shows only first folder when I use it
if(hFile.IsDirectory()) ListFile(hFile.GetFilePath()+L"\\*.*");
}
}
}
And then, I call it when click Browser button with the code
void CFileListingDlg::OnBnClickedBtnBrowse()
{
// TODO: Add your control notification handler code here
// TODO: Add your control notification handler code here
CFolderPickerDialog folderDialog(_T("E:\\Test"));
if(folderDialog.DoModal()==IDOK)
{
m_eFolder.SetWindowText(folderDialog.GetPathName());
m_lFiles.ResetContent();
ListFile(folderDialog.GetPathName());
}
}
Here is the proper way to implement recursive files listing:
void ListFiles(const CString& sPath, CStringArray& files)
{
CFileFind finder;
// build a string with wildcards
CString sWildcard(sPath);
sWildcard += _T("\\*.*");
BOOL bWorking = finder.FindFile(sWildcard);
while (bWorking)
{
bWorking = finder.FindNextFile();
// skip . and .. files; otherwise, we'd
// recur infinitely!
if (finder.IsDots())
continue;
// if it's a directory, recursively traverse it
if (finder.IsDirectory())
{
CString sFile = finder.GetFilePath();
files.Add(sFile);
ListFiles(sFile, files);
}
}
finder.Close();
}
I have been creating an application in qt. I have added open function in it, but was happening that when I open an already open file, it again opens the same file instead of pointing it to already opened file.
void MainWindow::actionOpen()
{
QFileInfo fileInfo = UIUtils::openFile(this);
if (!fileInfo.exists()) {
return;
}
if (!MainWindow::mdiMode && !maybeSave()) {
return;
}
openFile(fileInfo.filePath());
}
Please help me to solve the problem.
I'm not 100 % clear on what the issue is, but if you don't want to run the openFile function on files you've previously opened, you have to keep a record.
For instance, define a QList in your header file:
QList<QFileInfo> knownFiles;
And then keep it up to date and check it:
void MainWindow::actionOpen()
{
QFileInfo fileInfo = UIUtils::openFile(this);
if (!fileInfo.exists()) {
return;
}
if (!MainWindow::mdiMode && !maybeSave()) {
return;
}
bool fileIsKnown = false;
for(qint64 i=0; i<knownFiles.length(); i++)
if(knownFiles.at(i) == fileInfo)
{
fileIsKnown = true;
break;
}
if(!fileIsKnown)
{
knownFiles << fileInfo;
openFile(fileInfo.filePath());
}
}
I don't know what you mean when you say "instead of pointing it to already opened file.".
this is my first question here, i always found the answers i need but today, that "always" has ended haha. My problem is that i'm trying to read a text file with QFile and QTextStream and save the values inside an STL vector. When i try to read the vector, I obtain that is empty(forgive any mistakes with my english, is no my first language). Here i leave you the methods.
bool TGraphic::process_data( void )
{
bool openingOk = false;
QString line;
if(QFile::exists( this->input_file.fileName() ))
{
openingOk = this->input_file.open(QIODevice::Text | QIODevice::ReadOnly);
QTextStream flujo(&input_file);
while(!(flujo.atEnd()))
{
line = flujo.readLine();
this->data.push_back( line.toInt() ); // data is std::vector<int> data;
}
}
return openingOk;
}
The compiler doesn't give me any errors but when i do this
void Ventana::on_pbGraphic_clicked()
{
imgGen = new TGraphic(fileName);
std::vector<int> aux(imgGen->getVector());
bool dataOk, graphicOk;
img = new QPixmap(400, 300);
dataOk = imgGen->process_data();
graphicOk = imgGen->process_graphic(*img);
if(dataOk && graphicOk && !(aux.empty())) // ** THE LAS CONDITION GAVE ME FALSE **
{
//ui->labGraphic->setPixmap(*img);
ui->labNombreArchivo->setText(QString::number(aux[0])); // I TRIED TO GET THE
} // THE FIRST VALUE OF
else // THE VECTOR AND THE
{ // PROGRAM FAILS THERE.
ui->labGraphic->setText("Error.");
}
}
in dialog.cpp i get a false. Can you guys help to see where is the problem? If you need extra information ask me. Thanks!
I have created a grid function using list control. There are two columns in the list. Data and NAME.
The user should select a file; and the data inside the file should be diplayed in first column "DATA" and file name should be displayed in the 2nd column "NAME".
I have written a code but nothing is appearing in the list
CFileFind finder;
bool bFound;
CString filename = "C:\\ Location\\*.txt";
bFound = finder.FindFile(filename);
if(bFound)
{
while(bFound)
{
bFound = finder.FindNextFile();
if(bFound)
{
m_List.AddString(finder.GetFileName()); //This is where the actual data is added
}
}
CStdioFile files;
CFileException exp;
CString strLine;
if (files.Open(filename, CFile::modeRead, &exp))
{
while(files.ReadString(strLine)){}
}
}
void CuserspecificationDlg::InsertItems()
{
HWND hWnd = ::GetDlgItem(m_hWnd, IDC_LIST1);
// Set the LVCOLUMN structure with the required
// column information
..
..
SetCell(hWnd,out,1,1); // where out is the Cstring variable for edit control
}
What can be the mistake?
Please see a tutorial on how to use List box here. You could define a member variable of type CListBox that is mapped to your list box via the control wizard.