Bitmap Constructor (Stream) (System.Drawing)

Bitmap Constructor (Stream)

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Microsoft Visual Studio 2005/.NET Framework 2.0

Other versions are also available for the following:

Bitmap.Bitmap(Stream) Constructor

Initializes a new instance of the Bitmap class from the specified data stream.

Namespace: System.Drawing
Assembly: System.Drawing (in system.drawing.dll)

Syntax

Visual Basic (Declaration)

Public Sub New ( _
    stream As Stream _
)

Visual Basic (Usage)

Dim stream As Stream

Dim instance As New Bitmap(stream)

public Bitmap (
    Stream stream
)

C++

public:
Bitmap (
    Stream^ stream
)

public Bitmap (
    Stream stream
)

JScript

public function Bitmap (
    stream : Stream
)

XAML

Not applicable.

Parameters

stream: The data stream used to load the image.

Exceptions

Exception type	Condition
System.ArgumentException	stream does not contain image data or is a null reference (Nothing in Visual Basic). -or- stream contains a PNG image file with a single dimension greater than 65,535 pixels.

Exception type

Condition

System.ArgumentException

stream does not contain image data or is a null reference (Nothing in Visual Basic).

-or-

stream contains a PNG image file with a single dimension greater than 65,535 pixels.

Remarks

You must keep the stream open for the lifetime of the Bitmap.

Due to a limitation of the GDI+ decoder, an System.ArgumentException is thrown if you construct a bitmap from a .png image file with a single dimension greater than 65,535 pixels.

Example

The following code example demonstrates how to load a bitmap from a stream.

This example is designed to be used with Windows Forms. Create a form that contains a PictureBox named PictureBox1. Paste the code into the form and call the InitializeStreamBitmap method from the form's constructor or Load event-handling method.

Visual Basic

Private Sub InitializeStreamBitmap()
    Try
        Dim request As System.Net.WebRequest = _
            System.Net.WebRequest.Create( _
            "http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif")
        Dim response As System.Net.WebResponse = request.GetResponse()
        Dim responseStream As System.IO.Stream = response.GetResponseStream()
        Dim bitmap2 As New Bitmap(responseStream)
        PictureBox1.Image = bitmap2

    Catch ex As System.Net.WebException
        MessageBox.Show("There was an error opening the image file. Check the URL")
    End Try
End Sub

private void InitializeStreamBitmap()
{
    try
    {
        System.Net.WebRequest request = 
            System.Net.WebRequest.Create(
            "http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif");
        System.Net.WebResponse response = request.GetResponse();
        System.IO.Stream responseStream = 
            response.GetResponseStream();
        Bitmap bitmap2 = new Bitmap(responseStream);
        PictureBox1.Image = bitmap2;

    }
    catch(System.Net.WebException)
    {
        MessageBox.Show("There was an error opening the image file."
           + "Check the URL");
    }
}

C++

void InitializeStreamBitmap()
{
   try
   {
      System::Net::WebRequest^ request = System::Net::WebRequest::Create( "http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif" );
      System::Net::WebResponse^ response = request->GetResponse();
      System::IO::Stream^ responseStream = response->GetResponseStream();
      Bitmap^ bitmap2 = gcnew Bitmap( responseStream );
      PictureBox1->Image = bitmap2;
   }
   catch ( System::Net::WebException^ ) 
   {
      MessageBox::Show( "There was an error opening the image file."
      "Check the URL" );
   }

}

private void InitializeStreamBitmap()
{
    try {
        System.Net.WebRequest request = System.Net.WebRequest.Create(
            "http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif");
        System.Net.WebResponse response = request.GetResponse();
        System.IO.Stream responseStream = response.GetResponseStream();
        Bitmap bitmap2 = new Bitmap(responseStream);

        pictureBox1.set_Image(bitmap2);
    }
    catch (System.Net.WebException exp) {
        MessageBox.Show(("There was an error opening the image file." 
            + "Check the URL"));
    }
} //InitializeStreamBitmap

Platforms

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

Reference

Bitmap Class
Bitmap Members
System.Drawing Namespace

Other Resources

Types of Bitmaps