Bitmap 构造函数

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::Drawing::Image ^ original);

public Bitmap(System.Drawing.Image original);

new System.Drawing.Bitmap : System.Drawing.Image -> System.Drawing.Bitmap

Public Sub New (original As Image)

参数

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::IO::Stream ^ stream);

public Bitmap(System.IO.Stream stream);

new System.Drawing.Bitmap : System.IO.Stream -> System.Drawing.Bitmap

Public Sub New (stream As Stream)

参数

例外

示例

下面的代码示例演示如何从流加载位图。

此示例旨在与 Windows 窗体一起使用。 创建包含命名的PictureBoxPictureBox1窗体。 将代码粘贴到窗体中，并从窗体的构造函数或Load事件处理方法调用InitializeStreamBitmap该方法。

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.Image = bitmap2;
    }
    catch(System.Net.WebException)
    {
        MessageBox.Show("There was an error opening the image file."
           + "Check the URL");
    }
}

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

注解

必须在流的生存期内保持打开状态 Bitmap。

由于 GDI+ 解码器的限制， System.ArgumentException 如果从 .png 图像文件中构造位图，其维度大于 65,535 像素，则会引发位图。

另请参阅

• 位图类型

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::String ^ filename);

public Bitmap(string filename);

new System.Drawing.Bitmap : string -> System.Drawing.Bitmap

Public Sub New (filename As String)

参数

例外

注解

文件名和路径可以相对于应用程序或绝对路径。 使用此构造函数可打开具有以下文件格式的图像：BMP、GIF、EXIF、JPG、PNG 和 TIFF。 有关支持的格式的详细信息，请参阅 位图的类型。 文件保持锁定状态， Bitmap 直到释放。

另请参阅

• 位图类型

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::Drawing::Image ^ original, System::Drawing::Size newSize);

public Bitmap(System.Drawing.Image original, System.Drawing.Size newSize);

new System.Drawing.Bitmap : System.Drawing.Image * System.Drawing.Size -> System.Drawing.Bitmap

Public Sub New (original As Image, newSize As Size)

参数

例外

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(int width, int height);

public Bitmap(int width, int height);

new System.Drawing.Bitmap : int * int -> System.Drawing.Bitmap

Public Sub New (width As Integer, height As Integer)

参数

例外

注解

此构造函数创建一个BitmapPixelFormat枚举值为 Format32bppArgb.

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::IO::Stream ^ stream, bool useIcm);

public Bitmap(System.IO.Stream stream, bool useIcm);

new System.Drawing.Bitmap : System.IO.Stream * bool -> System.Drawing.Bitmap

Public Sub New (stream As Stream, useIcm As Boolean)

参数

例外

注解

必须在流的生存期内保持打开状态 Bitmap。

由于 GDI+ 解码器的限制， System.ArgumentException 如果从 .png 图像文件中构造位图，其维度大于 65,535 像素，则会引发位图。

另请参阅

• 位图类型

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::String ^ filename, bool useIcm);

public Bitmap(string filename, bool useIcm);

new System.Drawing.Bitmap : string * bool -> System.Drawing.Bitmap

Public Sub New (filename As String, useIcm As Boolean)

参数

示例

下面的代码示例演示如何从文件构造新位图。 该示例使用 GetPixel 和 SetPixel 方法重新着色图像。 它还使用 PixelFormat 属性。

此示例设计为与包含一LabelPictureBox个和命名Label1PictureBox1以及ButtonButton1分别包含的 Windows 窗体一起使用。 将代码粘贴到窗体中，并将 Button1_Click 该方法与按钮 Click 的事件相关联。

private:
   Bitmap^ image1;
   void Button1_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      try
      {
         
         // Retrieve the image.
         image1 = gcnew Bitmap( "C:\\Documents and Settings\\All Users\\"
         "Documents\\My Music\\music.bmp",true );
         int x;
         int y;
         
         // Loop through the images pixels to reset color.
         for ( x = 0; x < image1->Width; x++ )
         {
            for ( y = 0; y < image1->Height; y++ )
            {
               Color pixelColor = image1->GetPixel( x, y );
               Color newColor = Color::FromArgb( pixelColor.R, 0, 0 );
               image1->SetPixel( x, y, newColor );

            }

         }
         
         // Set the PictureBox to display the image.
         PictureBox1->Image = image1;
         
         // Display the pixel format in Label1.
         Label1->Text = String::Format( "Pixel format: {0}", image1->PixelFormat );
      }
      catch ( ArgumentException^ ) 
      {
         MessageBox::Show( "There was an error."
         "Check the path to the image file." );
      }

   }

Bitmap image1;

private void Button1_Click(System.Object sender, System.EventArgs e)
{

    try
    {
        // Retrieve the image.
        image1 = new Bitmap(@"C:\Documents and Settings\All Users\" 
            + @"Documents\My Music\music.bmp", true);

        int x, y;

        // Loop through the images pixels to reset color.
        for(x=0; x<image1.Width; x++)
        {
            for(y=0; y<image1.Height; y++)
            {
                Color pixelColor = image1.GetPixel(x, y);
                Color newColor = Color.FromArgb(pixelColor.R, 0, 0);
                image1.SetPixel(x, y, newColor);
            }
        }

        // Set the PictureBox to display the image.
        PictureBox1.Image = image1;

        // Display the pixel format in Label1.
        Label1.Text = "Pixel format: "+image1.PixelFormat.ToString();
    }
    catch(ArgumentException)
    {
        MessageBox.Show("There was an error." +
            "Check the path to the image file.");
    }
}

Dim image1 As Bitmap

Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    Try
        ' Retrieve the image.
        image1 = New Bitmap( _
            "C:\Documents and Settings\All Users\Documents\My Music\music.bmp", _
            True)

        Dim x, y As Integer

        ' Loop through the images pixels to reset color.
        For x = 0 To image1.Width - 1
            For y = 0 To image1.Height - 1
                Dim pixelColor As Color = image1.GetPixel(x, y)
                Dim newColor As Color = _
                    Color.FromArgb(pixelColor.R, 0, 0)
                image1.SetPixel(x, y, newColor)
            Next
        Next

        ' Set the PictureBox to display the image.
        PictureBox1.Image = image1

        ' Display the pixel format in Label1.
        Label1.Text = "Pixel format: " + image1.PixelFormat.ToString()

    Catch ex As ArgumentException
        MessageBox.Show("There was an error." _
            & "Check the path to the image file.")
    End Try
End Sub

注解

使用此构造函数可打开具有以下文件格式的图像：BMP、GIF、EXIF、JPG、PNG 和 TIFF。 有关支持的格式的详细信息，请参阅 位图的类型。 文件保持锁定状态， Bitmap 直到释放。

另请参阅

• 位图类型

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(Type ^ type, System::String ^ resource);

public Bitmap(Type type, string resource);

new System.Drawing.Bitmap : Type * string -> System.Drawing.Bitmap

Public Sub New (type As Type, resource As String)

参数

示例

下面的代码示例演示如何从类型构造位图，以及如何使用该方法 Save 。 若要运行此示例，请将代码粘贴到 Windows 窗体中。 处理表单 Paint 的事件并调用 ConstructFromResourceSaveAsGif 方法，并 e 作为 PaintEventArgs

private:
    void ConstructFromResourceSaveAsGif(PaintEventArgs^ e)
    {
        // Construct a bitmap from the button image resource.
        Bitmap^ bmp1 = gcnew Bitmap(Button::typeid, "Button.bmp");
        String^ savePath =  
            Environment::GetEnvironmentVariable("TEMP") + "\\Button.bmp";

        try
        {
            // Save the image as a GIF.
            bmp1->Save(savePath, System::Drawing::Imaging::ImageFormat::Gif);
        }
        catch (IOException^)
        {
            // Carry on regardless
        }

        // Construct a new image from the GIF file.
        Bitmap^ bmp2 = nullptr;
        if (File::Exists(savePath))
        {
            bmp2 = gcnew Bitmap(savePath);
        }

        // Draw the two images.
        e->Graphics->DrawImage(bmp1, Point(10, 10));

        // If bmp1 did not save to disk, bmp2 may be null
        if (bmp2 != nullptr)
        {
            e->Graphics->DrawImage(bmp2, Point(10, 40));
        }

        // Dispose of the image files.
        delete bmp1;
        if (bmp2 != nullptr)
        {
            delete bmp2;
        }
    }

private void ConstructFromResourceSaveAsGif(PaintEventArgs e)
{

    // Construct a bitmap from the button image resource.
    Bitmap bmp1 = new Bitmap(typeof(Button), "Button.bmp");

    // Save the image as a GIF.
    bmp1.Save("c:\\button.gif", System.Drawing.Imaging.ImageFormat.Gif);

    // Construct a new image from the GIF file.
    Bitmap bmp2 = new Bitmap("c:\\button.gif");

    // Draw the two images.
    e.Graphics.DrawImage(bmp1, new Point(10, 10));
    e.Graphics.DrawImage(bmp2, new Point(10, 40));

    // Dispose of the image files.
    bmp1.Dispose();
    bmp2.Dispose();
}

Private Sub ConstructFromResourceSaveAsGif(ByVal e As PaintEventArgs)

    ' Construct a bitmap from the button image resource.
    Dim bmp1 As New Bitmap(GetType(Button), "Button.bmp")

    ' Save the image as a GIF.
    bmp1.Save("c:\button.gif", System.Drawing.Imaging.ImageFormat.Gif)

    ' Construct a new image from the GIF file.
    Dim bmp2 As New Bitmap("c:\button.gif")

    ' Draw the two images.
    e.Graphics.DrawImage(bmp1, New Point(10, 10))
    e.Graphics.DrawImage(bmp2, New Point(10, 40))

    ' Dispose of the image files.
    bmp1.Dispose()
    bmp2.Dispose()
End Sub

注解

此构造函数将给定类型的命名空间与资源的字符串名称相结合，并在程序集清单中查找匹配项。 例如，可以传入 Button 类型并 Button.bmp 传递给此构造函数，它将查找名为 System.Windows.Forms.Button.bmp的资源。

另请参阅

• 位图类型

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(System::Drawing::Image ^ original, int width, int height);

public Bitmap(System.Drawing.Image original, int width, int height);

new System.Drawing.Bitmap : System.Drawing.Image * int * int -> System.Drawing.Bitmap

Public Sub New (original As Image, width As Integer, height As Integer)

参数

例外

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(int width, int height, System::Drawing::Graphics ^ g);

public Bitmap(int width, int height, System.Drawing.Graphics g);

new System.Drawing.Bitmap : int * int * System.Drawing.Graphics -> System.Drawing.Bitmap

Public Sub New (width As Integer, height As Integer, g As Graphics)

参数

例外

注解

此方法创建的新 Bitmap 方法分别采用 DpiX 其水平分辨率和 DpiY 垂直分辨率以及 g其属性。

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(int width, int height, System::Drawing::Imaging::PixelFormat format);

public Bitmap(int width, int height, System.Drawing.Imaging.PixelFormat format);

new System.Drawing.Bitmap : int * int * System.Drawing.Imaging.PixelFormat -> System.Drawing.Bitmap

Public Sub New (width As Integer, height As Integer, format As PixelFormat)

参数

例外

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

Source:

Bitmap.cs

public:
 Bitmap(int width, int height, int stride, System::Drawing::Imaging::PixelFormat format, IntPtr scan0);

public Bitmap(int width, int height, int stride, System.Drawing.Imaging.PixelFormat format, IntPtr scan0);

new System.Drawing.Bitmap : int * int * int * System.Drawing.Imaging.PixelFormat * nativeint -> System.Drawing.Bitmap

Public Sub New (width As Integer, height As Integer, stride As Integer, format As PixelFormat, scan0 As IntPtr)

参数

例外

示例

下面的代码示例演示如何使用 Bitmap(Int32, Int32, Int32, PixelFormat, IntPtr) 构造函数。 此示例旨在与 Windows 窗体一起使用，需要一个 PaintEventArgs 参数，该参数是事件的一个参数 Paint 。

private void BitmapConstructorEx(PaintEventArgs e)
{

    // Create a bitmap.
    Bitmap bmp = new Bitmap("c:\\fakePhoto.jpg");
    
   // Retrieve the bitmap data from the bitmap.
    System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), 
        ImageLockMode.ReadOnly, bmp.PixelFormat);

    //Create a new bitmap.
    Bitmap newBitmap = new Bitmap(200, 200, bmpData.Stride, bmp.PixelFormat, bmpData.Scan0);

    bmp.UnlockBits(bmpData);

    // Draw the new bitmap.
    e.Graphics.DrawImage(newBitmap, 10, 10);
}

Private Sub BitmapConstructorEx(ByVal e As PaintEventArgs)

    ' Create a bitmap.
    Dim bmp As New Bitmap("c:\fakePhoto.jpg")

    ' Retrieve the bitmap data from the bitmap.
    Dim bmpData As System.Drawing.Imaging.BitmapData = bmp.LockBits(New Rectangle(0, 0, bmp.Width, bmp.Height), _
        ImageLockMode.ReadOnly, bmp.PixelFormat)

    'Create a new bitmap.
    Dim newBitmap As New Bitmap(200, 200, bmpData.Stride, bmp.PixelFormat, bmpData.Scan0)

    bmp.UnlockBits(bmpData)

    ' Draw the new bitmap.
    e.Graphics.DrawImage(newBitmap, 10, 10)

End Sub

注解

调用方负责分配和释放参数指定的 scan0 内存块。 但是，在释放相关 Bitmap 内容之前，不应释放内存。