public Image getImagen(int id_voluntario)
{
Image ret = null;
CnxBase myBase = new CnxBase();
string reqSQL = "SELECT foto FROM z_voluntarios WHERE id_voluntario=" + id_voluntario;
try
{
NpgsqlConnection myConn = myBase.OpenConnection(myBase.cnxString);
NpgsqlCommand myCommand = new NpgsqlCommand(reqSQL, myConn);
NpgsqlDataReader myReader = myCommand.ExecuteReader();
if (myReader.Read() && myReader[0] != DBNull.Value)
{
NpgsqlTransaction t = myConn.BeginTransaction();
NpgsqlTypes.LargeObjectManager lbm = new NpgsqlTypes.LargeObjectManager(myConn);
NpgsqlTypes.LargeObject lo = lbm.Open(Convert.ToInt32(myReader[0]), NpgsqlTypes.LargeObjectManager.READ);
byte[] buf = new byte[lo.Size()];
buf = lo.Read(lo.Size());
MemoryStream ms = new MemoryStream();
ms.Write(buf, 0, lo.Size());
lo.Close();
t.Commit();
ret = Image.FromStream(ms);
}
myConn.Close();
}
catch (Exception myErr)
{
throw (new Exception(myErr.ToString() + reqSQL));
}
return(ret);
}
/// <summary>
/// Gets the contents of a LargeObject into a buffer.
/// </summary>
/// <param name="largeObject">The large object.</param>
/// <returns></returns>
/// <remarks>Documented by Dev02, 2008-08-08</remarks>
private byte[] LargeObjectToBuffer(LargeObject largeObject)
{
largeObject.Seek(0);
int size = largeObject.Size();
byte[] buffer = new byte[size];
int offset = 0;
while (offset < size)
{
largeObject.Read(buffer, offset, Math.Min(chunkSize, size - offset));
offset += chunkSize;
}
return buffer;
}
/// <summary>
/// Writes the content of a buffer into a LargeObject.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="largeObject">The large object.</param>
/// <param name="rpu">The rpu.</param>
/// <param name="caller">The calling object.</param>
/// <remarks>Documented by Dev02, 2008-08-08</remarks>
private void BufferToLargeObject(byte[] buffer, LargeObject largeObject, StatusMessageReportProgress rpu, object caller)
{
largeObject.Seek(0);
int offset = 0;
int size = buffer.Length;
StatusMessageEventArgs args = new StatusMessageEventArgs(StatusMessageType.CreateMediaProgress, buffer.Length);
while (offset < size)
{
largeObject.Write(buffer, offset, Math.Min(chunkSize, size - offset));
offset += chunkSize;
args.Progress = offset;
if (rpu != null)
rpu(args, caller);
}
}
/// <summary>
/// Writes the content of a buffer into a LargeObject.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="largeObject">The large object.</param>
/// <remarks>Documented by Dev02, 2008-08-08</remarks>
private void BufferToLargeObject(byte[] buffer, LargeObject largeObject)
{
largeObject.Seek(0);
int offset = 0;
int size = buffer.Length;
while (offset < size)
{
largeObject.Write(buffer, offset, Math.Min(chunkSize, size - offset));
offset += chunkSize;
}
}
public DBFileStream (DBFile file, DB db)
{
try {
transaction = db.dbcon.BeginTransaction ();
obj = db.Manager.Open (file.file_id.Value);
} catch {
if (transaction != null) {
transaction.Rollback ();
transaction = null;
}
}
}
