CreateGdPictureImageFromFile(String,Boolean) Method

In This Topic

Creates a new GdPicture image representing the image based on an input image file according to what you have specified. You can also specify if the file content is loaded into memory or not using this method. The newly created image is identified by its unique non-zero image identifier.

Please note that it is your responsibility to release the image resources once you have no use for them.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Overloads Function CreateGdPictureImageFromFile( _
   ByVal FilePath As String, _
   ByVal LoadInMemory As Boolean _
) As Integer

public int CreateGdPictureImageFromFile( 
   string FilePath,
   bool LoadInMemory
)

public function CreateGdPictureImageFromFile( 
    FilePath: String;
    LoadInMemory: Boolean
): Integer;

public function CreateGdPictureImageFromFile( 
   FilePath : String,
   LoadInMemory : boolean
) : int;

public: int CreateGdPictureImageFromFile( 
   string* FilePath,
   bool LoadInMemory
)

public:
int CreateGdPictureImageFromFile( 
   String^ FilePath,
   bool LoadInMemory
)

Parameters

FilePath: The file path of the input image file. Use the empty string to allow the control to prompt users to select a file.
You can subsequently use the GetLastPath method to retrieve the path of the selected file.
LoadInMemory: Specifies if the document content will be loaded into memory (true). Loading the document content directly into memory results in a better manipulation performance, but it consumes more memory. If you load a file into memory, you can subsequently overwrite or delete the file.

Return Value

A unique image identifier of the GdPicture image representing the newly created image. The returned value is non-zero if the image is successfully created. Please first of all use the GetStat method to determine if this method has been successful.

Be aware that you need to release the image resource with the ReleaseGdPictureImage method after being used.

Remarks

It is recommend to use the GetStat method to identify the specific reason for the method's failure, if any.

All document formats currently supported by the toolkit are listed here.

This class loads multipage images (GIF and TIFF formats) in read-write mode by default. If you want to open multipage images in read-only mode, you need to call the GifOpenMultiFrameForWrite method for GIF format and the TiffOpenMultiPageForWrite method for TIFF format and set the WriteAccess parameter to false before creating an image.

Example

Creating a GdPicture image from an image file.

Performing a negative effect on a jpeg image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    // LoadInMemory parameter is set to true in order to be able to update the input file.
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", true);
    gdpictureImaging.FxNegative(imageID);
    gdpictureImaging.SaveAsJPEG(imageID, "image.jpg", 75);
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Removing the white margins from a jpeg image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    // LoadInMemory parameter is set to true in order to be able to update the input file.
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", true);
 
    // Detect and remove the white margins using the default confidence level.
    gdpictureImaging.CropWhiteBorders(imageID);
 
    gdpictureImaging.SaveAsJPEG(imageID, "image.jpg", 75);
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
Overload List
GetStat Method
ReleaseGdPictureImage Method