Develop Reference

Drag & Drop from internet browser (winforms)

Application I'm making give user ability to drag picture onto it and then copy this image to several folders at once.
Everything works great when I use local file, but I can't make it work with images dragged from internet browser directly on form.
Sure, image is saved in correct folders but name is changed to gibberish with .bmp extension.
So for example when I drag 100kb image with name "image.jpg" from browser I get 3mb image with name "sInFeER.bmp". I'm testing it on Firefox. I know I'm actually copying image from browser temp folder when I do that and file name is already changed there.
How can I keep correct file name and extension in this situation? (and preferably get image NOT converted to huge bmp file...)
Code I'm using for testing:
private void button10_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true)
{
e.Effect = DragDropEffects.All;
}
}
private void button10_DragDrop(object sender, DragEventArgs e)
{
string[] draggedFiles = (string[])e.Data.GetData(DataFormats.FileDrop, false);
CatchFile(0, draggedFiles);
}
private void CatchFile(int id, string[] draggedFiles)
{
string directory = #”C:\test\”;
foreach (string file in draggedFiles)
{
Directory.CreateDirectory(directory);
File.Copy(file, directory + Path.GetFileName(file));
MessageBox.Show(Path.GetFileName(file)); // test
}
}

Thanks for all answers.
I've done some reading and decided that accessing original image when dragging from browser (Firefox) is pretty much impossible (without use of Firefox API), so I just used WebClient.DownloadFile to download dropped picture.
Here is code I ended with:
private void button10_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true)
{
e.Effect = DragDropEffects.All;
}
}
private void button10_DragDrop(object sender, DragEventArgs e)
{
string draggedFileUrl = (string)e.Data.GetData(DataFormats.Html, false);
string[] draggedFiles = (string[])e.Data.GetData(DataFormats.FileDrop, false);
CatchFile(draggedFiles, draggedFileUrl);
}
private void CatchFile(string[] draggedFiles, string draggedFileUrl)
{
string directory = #"C:\test\";
foreach (string file in draggedFiles)
{
Directory.CreateDirectory(directory);
if (string.IsNullOrEmpty(draggedFileUrl))
{
if (!File.Exists(directory + Path.GetFileName(file))) File.Copy(file, directory + Path.GetFileName(file));
else
{
MessageBox.Show("File with that name already exists!");
}
}
else
{
string fileUrl = GetSourceImage(draggedFileUrl);
if (!File.Exists(directory + Path.GetFileName(fileUrl)))
{
using (var client = new WebClient())
{
client.DownloadFileAsync(new Uri(fileUrl), directory + Path.GetFileName(fileUrl));
}
}
else
{
MessageBox.Show("File with that name already exists!");
}
}
// Test check:
if (string.IsNullOrEmpty(draggedFileUrl)) MessageBox.Show("File dragged from hard drive.\n\nName:\n" + Path.GetFileName(file));
else MessageBox.Show("File dragged frow browser.\n\nName:\n" + Path.GetFileName(GetSourceImage(draggedFileUrl)));
}
}
private string GetSourceImage(string str)
{
string finalString = string.Empty;
string firstString = "src=\"";
string lastString = "\"";
int startPos = str.IndexOf(firstString) + firstString.Length;
string modifiedString = str.Substring(startPos, str.Length - startPos);
int endPos = modifiedString.IndexOf(lastString);
finalString = modifiedString.Substring(0, endPos);
return finalString;
}
There is probably better way of doing that but this works for me. Doesn't seem to work with other browsers. (but I needed it only to work with Firefox so I don't care)

Looks like you were dragging pixels from firefox to your app, not the url. I would look on the mozilla site for more info on how to drag the url to your app. They have lots of programming stuff and APIs to interact with the browser.

Issue with output location when saving file

Currently having an issue when saving a merged word. doc to a specific location using a filebrowser dialog
// input destintion
private string[] sourceFiles;
private void browseButton_Click(object sender, EventArgs e)
{
FolderBrowserDialog diagBrowser = new FolderBrowserDialog();
diagBrowser.Description = "Select a folder which contains files needing combined...";
// Default folder, altered when the user selects folder of choice
string selectedFolder = #"";
diagBrowser.SelectedPath = selectedFolder;
// initial file path display
folderPath.Text = diagBrowser.SelectedPath;
if (DialogResult.OK == diagBrowser.ShowDialog())
{
// Grab the folder that was chosen
selectedFolder = diagBrowser.SelectedPath;
folderPath.Text = diagBrowser.SelectedPath;
sourceFiles = Directory.GetFiles(selectedFolder, "*.doc");
}
}
// output destintion
private string[] sourceFileOutput;
private void browseButtonOut_Click(object sender, EventArgs e)
{
FolderBrowserDialog diagBrowserOutput = new FolderBrowserDialog();
diagBrowserOutput.Description = "Select a folder location to save the document...";
// Default folder, altered when the user selects folder of choice
string outputFolder = #"";
diagBrowserOutput.SelectedPath = outputFolder;
// output file path display
outputPath.Text = diagBrowserOutput.SelectedPath;
if (DialogResult.OK == diagBrowserOutput.ShowDialog())
{
outputFolder = diagBrowserOutput.SelectedPath;
outputPath.Text = diagBrowserOutput.SelectedPath;
sourceFileOutput = Directory.GetFiles(outputFolder);
}
}
private void combineButton_Click(object sender, EventArgs e)
{
if (sourceFiles != null && sourceFiles.Length > 0)
{
string outputFileName = (sourceFileOutput + "Combined.docx");
MsWord.Merge(sourceFiles, outputFileName, true);
// Message displaying how many files are combined.
MessageBox.Show("A total of " + sourceFiles.Length.ToString() + " documents have been merged", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
// Message displaying error.
MessageBox.Show("Please a select a relevant folder with documents to combine", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
instead of getting the 'combined.docx' in the location chosen, i instead get a file called 'System.String[]Combined' saved on the desktop. Obviously there is something clashing regarding the name and the user selected file path.
i currently have the input folder options working however the output + file name doesn't seem to be working correctly.
any suggestions or help would be greatly appreciated, thank you.

string outputFileName = (sourceFileOutput + "Combined.docx");
This should probably read
string outputFileName = selectedFolder + "Combined.docx";
That said, please use Path.Combine to combine two parts of a path.

got the program to use the 'selected' destination.
// output destintion
string outputFolder = #"";
private void browseButtonOut_Click(object sender, EventArgs e)
{
FolderBrowserDialog diagBrowserOutput = new FolderBrowserDialog();
diagBrowserOutput.Description = "Select a folder location to save the document...";
// Default folder, altered when the user selects folder of choice
diagBrowserOutput.SelectedPath = outputFolder;
// output file path display
outputPath.Text = diagBrowserOutput.SelectedPath;
if (DialogResult.OK == diagBrowserOutput.ShowDialog())
{
outputFolder = diagBrowserOutput.SelectedPath;
outputPath.Text = diagBrowserOutput.SelectedPath;
}
}
private void combineButton_Click(object sender, EventArgs e)
{
if (sourceFiles != null && sourceFiles.Length > 0)
{
string folderFolder = outputFolder;
string outputFile = "Combined.docx";
string outputFileName = Path.Combine(folderFolder, outputFile);
MsWord.Merge(sourceFiles, outputFileName, true);
// Message displaying how many files are combined.
MessageBox.Show("A total of " + sourceFiles.Length.ToString() + " documents have been merged", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
i used the path.combine as suggested, as played around with the variables i had used.

Creating a text file with user entered name using c#

hi i have a webform where i am trying to create a txt file in a particular directory but i want to the name of the txt file to be entered by the user but I am not getting it how to do it please help
the code below creates a text file with name NameBox.Text.ToString I dont want that please help and thanks.
protected void Page_Load(object sender, EventArgs e)
{
NameLabel.Visible = false;
NameBox.Visible = false;
submit.Visible = false;
}
protected void Button1_Click(object sender, EventArgs e)
{
NameLabel.Visible = true;
NameBox.Visible = true;
submit.Visible = true;
}
protected void submit_Click(object sender, EventArgs e)
{
// string fname = NameBox.Text;
string path = #"D:\NameBox.Text.ToString.txt";
try
{
// Delete the file if it exists.
if (File.Exists(path))
{
// Note that no lock is put on the
// file and the possibility exists
// that another process could do
// something with it between
// the calls to Exists and Delete.
File.Delete(path);
}
// Create the file.
using (FileStream fs = File.Create(path))
{
Byte[] info = new UTF8Encoding(true).GetBytes("This is some text in the file.");
// Add some information to the file.
fs.Write(info, 0, info.Length);
}
// Open the stream and read it back.
using (StreamReader sr = File.OpenText(path))
{
string s = "";
while ((s = sr.ReadLine()) != null)
{
Console.WriteLine(s);
}
}
}
catch (Exception Ex)
{
Console.WriteLine(Ex.ToString());
}
}
}

First, keep in mind that your IIS will not allow you to access your local file System as you expcect in a "console" application, maybe running with local admin rights.
Second, be sware of illegal characters for file names, you need to check or replace it.
And third, what if two users decide to use the same filename?
As Dejan Dakic already mentioned, step back and reconsider, maybe about using a database, like SQLite or something else.

string path = #"D:\NameBox.Text.ToString.txt";
That won't work. if your textfield is called "NameBox" you need to access the value of its text which is not possible within a String.
Try this:
String path = #"D:\" + NameBox.Text + ".txt";
If you're new to programming, I'd suggest to go get a book or some tutorials and get started that way! :)

Open a directory and process files/folders in background worker query

I have the following code, I'm trying to open a directory and process the files in it via the Background worker but I am having issues with it.
The error I have is (The name filePath does not exist in the current context), which I can understand because it's stored in another method? if someone could point out to me what is wrong with my code it would be appreciated. Folderbrowser doesn't work under the Background worker section.
private void btnFiles_Click(object sender, EventArgs e)
{
//btnFiles.Enabled = false;
btnSTOP.Enabled = true;
//Clear text fields
listBoxResults.Items.Clear();
listBoxPath.Items.Clear();
txtItemsFound.Text = String.Empty;
//Open folder browser for user to select the folder to scan
DialogResult result = folderBrowserDialog1.ShowDialog();
if (result == DialogResult.OK)
{
//Store selected folder path
string filePath = folderBrowserDialog1.SelectedPath;
}
//Start the async operation here
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
//Process the folder
try
{
foreach (string dir in Alphaleonis.Win32.Filesystem.Directory.EnumerateFiles(filePath, "*.*", SearchOption.AllDirectories, true))
{
//Populate List Box with all files found
this.Invoke(new Action(() => listUpdate2(dir)));
FileInfo fi = new FileInfo(dir);
if (fi.Length == 0)
{
//Populate List Box with all empty files found
this.Invoke(new Action(() => listUpdate1(dir + Environment.NewLine)));
}
}
}
//Catch exceptions
catch (Exception err)
{
// This code just writes out the message and continues to recurse.
log.Add(err.Message);
//throw;
}
finally
{
//add a count of the empty files here
txtItemsFound.Text = listBoxResults.Items.Count.ToString();
// Write out all the files that could not be processed.
foreach (string s in log)
{
this.Invoke(new Action(() => listUpdate1(s)));
}
log.Clear();
MessageBox.Show("Scanning Complete", "Done", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
//If cancel button was pressed while the execution is in progress
//Change the state from cancellation ---> cancelled
if (backgroundWorker1.CancellationPending)
{
e.Cancel = true;
//backgroundWorker1.ReportProgress(0);
return;
}
//}
//Report 100% completion on operation completed
backgroundWorker1.ReportProgress(100);
}

#DonBoitnott solution is the most general for data flow inside class. Specifically to BackgroundWorker there is another one exists
private void btnFiles_Click(object sender, EventArgs e)
{
...
// pass folder name
backgroundWorker1.RunWorkerAsync(folderBrowserDialog1.SelectedPath);
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
// get passed folder name
string filePath = (string)e.Argument;
...
}

The variable "filePath" is being declared local to the btnFiles_Click method. In order for it to be used elsewhere, it must be declared global to the code page:
public class Form1
{
private String _filePath = null;
private void btnFiles_Click(object sender, EventArgs e)
{
//get your file and assign _filePath here...
_filePath = folderBrowserDialog1.SelectedPath;
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
//use _filePath here...
}
}

C# Windows Forms - Select and Copy Multiple Files w MultiSelect, OpenFileDialog, & FileBrowserDialog

I'm developing a WinForms application using C# with an OpenFileDialog and FileBrowserDialog and I'd like to:
Enable selection of multiple xls files.
After selection is made, Display selected xlsx filenames in textbox
Copy the selected files to a separate directory Consolidated
How can I accomplish this?

Here is sample code:
OpenFileDialog od = new OpenFileDialog();
od.Filter = "XLS files|*.xls";
od.Multiselect = true;
if (od.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string tempFolder = System.IO.Path.GetTempPath();
foreach (string fileName in od.FileNames)
{
System.IO.File.Copy(fileName, tempFolder + #"\" + System.IO.Path.GetFileName(fileName));
}
}

There is MultiSelect property of OpenFileDialog which you need to set to true to allow selecting multiple files.
Here is a code example from MSDN which allows the user to select a multiple number of images and display them in PictureBox controls on a Form:
private void Form1_Load(object sender, EventArgs e)
{
InitializeOpenFileDialog();
}
private void InitializeOpenFileDialog()
{
// Set the file dialog to filter for graphics files.
this.openFileDialog1.Filter =
"Images (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF|" +
"All files (*.*)|*.*";
// Allow the user to select multiple images.
this.openFileDialog1.Multiselect = true;
this.openFileDialog1.Title = "My Image Browser";
}
private void selectFilesButton_Click(object sender, EventArgs e)
{
DialogResult dr = this.openFileDialog1.ShowDialog();
if (dr == System.Windows.Forms.DialogResult.OK)
{
// Read the files
foreach (String file in openFileDialog1.FileNames)
{
// Create a PictureBox.
try
{
PictureBox pb = new PictureBox();
Image loadedImage = Image.FromFile(file);
pb.Height = loadedImage.Height;
pb.Width = loadedImage.Width;
pb.Image = loadedImage;
flowLayoutPanel1.Controls.Add(pb);
}
catch (SecurityException ex)
{
// The user lacks appropriate permissions to read files, discover paths, etc.
MessageBox.Show("Security error. Please contact your administrator for details.\n\n" +
"Error message: " + ex.Message + "\n\n" +
"Details (send to Support):\n\n" + ex.StackTrace
);
}
catch (Exception ex)
{
// Could not load the image - probably related to Windows file system permissions.
MessageBox.Show("Cannot display the image: " + file.Substring(file.LastIndexOf('\\'))
+ ". You may not have permission to read the file, or " +
"it may be corrupt.\n\nReported error: " + ex.Message);
}
}
}

Combining both answers, here's the code I came up with to:
Enabling the user to Select Multiple XLSX Files (using MultiSelect, OpenFileDialog, this.OpenFileDialog Properties & FileBrowserDialog)
After selection is made, Display Selected XLSX Filenames in Textbox (by setting textBoxSourceFiles.Text value to sourceFileOpenFileDialog.FileNames)
Copy the Selected Files to a separate Consolidated directory (using foreach loop, System.IO.File.Copy, System.IO.Path.GetFileName, sourceFileOpenFileDialog.FileName)
private void sourceFiles_Click(object sender, EventArgs e)
{
Stream myStream;
OpenFileDialog sourceFileOpenFileDialog = new OpenFileDialog();
this.sourceFileOpenFileDialog.InitialDirectory = "i:\\CommissisionReconciliation\\Review\\";
this.sourceFileOpenFileDialog.Filter = "Excel Files (*.xls;*.xlsx;)|*.xls;*.xlsx;|All Files (*.*)|*.*";
this.sourceFileOpenFileDialog.FilterIndex = 2;
this.sourceFileOpenFileDialog.RestoreDirectory = true;
this.sourceFileOpenFileDialog.Multiselect = true;
this.sourceFileOpenFileDialog.Title = "Please Select Excel Source File(s) for Consolidation";
if (sourceFileOpenFileDialog.ShowDialog() == DialogResult.OK)
{
try
{
if ((myStream = sourceFileOpenFileDialog.OpenFile()) != null)
{
using (myStream)
{
// populates text box with selected filenames
textBoxSourceFiles.Text = sourceFileOpenFileDialog.FileNames;
}
} // ends if
} // ends try
catch (Exception ex)
{
MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
}
} // ends if (sourceFileOpenFileDialog.ShowDialog() == DialogResult.OK)
} // ends public void sourceFiles_Click
private void consolidateButton_Execute_Click(object sender, EventArgs e)
{
string consolidatedFolder = targetFolderBrowserDialog.SelectedPath;
foreach (String file in sourceFileOpenFileDialog.FileNames)
{
try
{
// Copy each selected xlsx files into the specified TargetFolder
System.IO.File.Copy(sourceFileOpenFileDialog.FileName, consolidatedFolder + #"\" + System.IO.Path.GetFileName(sourceFileOpenFileDialog.FileName));
Log("File" + sourceFileOpenFileDialog.FileName + " has been copied to " + consolidatedFolder + #"\" + System.IO.Path.GetFileName(sourceFileOpenFileDialog.FileName));
}
} // ends foreach loop
} // ends void consolidateButton_Execute_Click