The Browse button click event handler in .NET framework

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Listing 159 The Browse button click event handler
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private void BrowseBtn_Click(object sender, SystemEventArgs e) { OpenFileDialog openDlg = new OpenFileDialog(); openDlgFilter = "All Bitmap files|*bmp"; string filter = openDlgFilter; openDlgTitle = "Open a Bitmap File"; if(openDlgShowDialog() == DialogResultOK) { curFileName = openDlgFileName; textBox1Text = curFileName; } } The Save Image button code given inListing 1510 creates a FileStream object from the bitmap file, opens a connection with the database, adds a new data row, set its values, and saves the row back to the database
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Listing 1510 The Save Image button click event handler
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private void SaveImageBtn_Click(object sender, SystemEventArgs e) { // Read a bitmap's contents in a stream FileStream fs = new FileStream(curFileName, FileModeOpenOrCreate, FileAccessRead); byte[] rawData = new byte[fsLength]; fsRead(rawData, 0, SystemConvertToInt32(fsLength)); fsClose(); // Construct a SQL string and a connection object string sql = "SELECT * FROM Users"; OleDbConnection conn = new OleDbConnection(); connConnectionString = connectionString; // Open the connection if(connState != ConnectionStateOpen) connOpen(); // Create a data adapter and data set OleDbDataAdapter adapter = new OleDbDataAdapter(sql, conn); OleDbCommandBuilder cmdBuilder = new OleDbCommandBuilder(adapter); DataSet ds = new DataSet("Users"); adapterMissingSchemaAction = MissingSchemaActionAddWithKey; // Fill the data adapter adapterFill(ds,"Users"); string userDes = "Mahesh Chand is a founder of C# Corner "; userDes += "Author: 1 A Programmer's Guide to ADONET;"; userDes += ", 2 Applied ADONET ";
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// Create a new row DataRow row = dsTables["Users"]NewRow(); row["UserName"] = "Mahesh Chand"; row["UserEmail"] = "mcb@mindcrackercom"; row["UserDescription"] = userDes; row["UserPhoto"] = rawData; // Add the row to the collection dsTables["Users"]RowsAdd(row); // Save changes to the database adapterUpdate(ds, "Users"); // Clean up connection if(conn != null) { if(connState == ConnectionStateOpen) connClose(); // Dispose of connection connDispose(); } MessageBoxShow("Image Saved"); } Once the data has been saved, the next step is to read data from the database table, save it as a bitmap again, and view the bitmap on the form We can view an image using the GraphicsDrawImage method or using a picture box Our example uses a picture box The code for reading binary data is shown in Listing 1511 We open a connection, create a data adapter, fill a data set, and get the first row of the Users table If you want to read all the images, you may want to modify your application or loop through all the rows Once a row has been read, we retrieve the data stored in the UserPhoto column in a stream and save it as a bitmap file Later we view that bitmap file in a picture box by setting its Image property to the file name
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Listing 1511 Reading images from a database
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private void ReadImageBtn_Click(object sender, SystemEventArgs e) { // Construct a SQL string and a connection object string sql = "SELECT * FROM Users"; OleDbConnection conn = new OleDbConnection(); connConnectionString = connectionString; // Open the connection if(connState != ConnectionStateOpen) connOpen(); // Create a data adapter and data set OleDbDataAdapter adapter = new OleDbDataAdapter(sql, conn); OleDbCommandBuilder cmdBuilder = new OleDbCommandBuilder(adapter); DataSet ds = new DataSet("Users"); adapterMissingSchemaAction = MissingSchemaActionAddWithKey; // Fill the data adapter adapterFill(ds,"Users"); // Get the first row of the table DataRow row = dsTables["Users"]Rows[0]; // Read data in a stream byte[] rawData = new byte[0];
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rawData = (byte[])row["UserPhoto"]; int len = new int(); len = rawDataGetUpperBound(0); // Save rawData as a bitmap FileStream fs = new FileStream (savedImageName, FileModeOpenOrCreate, FileAccessWrite); fsWrite(rawData, 0, len); // Close the stream fsClose(); // View the image in a picture box curImage = ImageFromFile(savedImageName); pictureBox1Image = curImage; // Clean up connection if(conn != null) { if(connState == ConnectionStateOpen) connClose(); // Dispose of connection connDispose(); } } To see the program in action, we select the MyPhotobmp file by using theBrowse Image button, and we click theSave Image button When we open the database, we see that a new record has been added to the Users table When we click on the Read Image button, a new ImageFromDbbmp file is added to the current folder The output is shown inFigure 159
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