dSaveImageGIF (Function)

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Image found in a Web Camera control
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dSaveImageGIF (Function)

In french: dSauveImageGIF

Saves an image:

in a GIF file.
in memory.

This image corresponds to the image found:

in an Image control.
in a variable of type Image.
This type of variable is not available.
in a Bar Code control.
The Bar Code controls are not available in this version. Therefore, no image found in a Bar Code control can be saved.
in a Web Camera control.

Remarks:

Only the visible part of the Image control is saved.
This function can only be used to save the images for screen resolutions up to 32 bits.
This function cannot be used with the Image controls found in reports.

In browser code, this function can only be used to save an image in memory.

Caution: Using this function under Linux requires a specific configuration.. For more details, see The drawings.

Example

See additional examples

// Sauve en mémoire l'image présente dans "IMG_ImageDessin"
ResSauvegarde = dSaveImageGIF(IMG_ImageDessin, inMemory)

// Sauve l'image présente dans "IMG_ImageDessin" sur "C:\Documents\Image.GIF"
ResSauvegarde = dSaveImageGIF(IMG_ImageDessin, "C:\Documents\Image.GIF")

Syntax

Saving an image in a file in GIF format Hide the details

<Result> = dSaveImageGIF(<Image> , <File name> [, <Number of colors>])

<Result>: Boolean

True if the image was saved,
False otherwise. To get more details on the error, use ErrorInfo with the errMessage constant.

<Image>: Name of the Image control or variable

Name of the Image, Bar Code or Web Camera control to be used. Image controls in a report cannot be used.
Name of the Image or Web Camera control to be used.
Name of the Image variable to be used.
Name of the Image variable to be used.
This type of variable is not available.

<File name>: Character string

Name and full (or relative) path of GIF file. A UNC path can be used. The file extension is optional.
Caution:
The destination directory must exist in order for the image to be saved.
The existence of the GIF file is not checked. This file is automatically overwritten if it already exists.

<Number of colors>: Optional integer

Number of colors for the image saved. Value included between 16 and 256 (256 by default). This parameter corresponds to the number of colors proposed in the color palette when using the GIF file.

Saving an image in memory Hide the details

<Result> = dSaveImageGIF(<Image> , <inMemory> [, <Number of colors>])

<Result>: Buffer

Byte string containing the image in GIF format.
Then, this byte string can be assigned to an Image control, saved in a file (fSaveText), sent via a network (with the Socket functions), ...
In browser code, this byte string can only be assigned to another image ("Localize the image in the _WEB directory in browser code" must be unchecked). It cannot be saved in a file to build an image file.

<Image>: Name of the Image control or variable

Name of the Image, Bar Code or Web Camera control to be saved. Image controls in a report cannot be used.
Name of the Image or Web Camera control to be used.
Name of the Image variable to be used.
This type of variable is not available.

<inMemory>: Constant

inMemory: Constant used to save an image in memory.

<Number of colors>: Optional integer

Number of colors for the image saved. Value included between 16 and 256 (256 by default). This parameter corresponds to the number of colors proposed in the color palette when using the GIF file.

Remarks

Image found in a Web Camera control

Only the image displayed when dSaveImageGIF is executed is saved as a GIF image. To save this image, you can also use:

function VideoCapture: the image will be saved in BMP format.
the dSaveImageBMP function: the image will be saved in BMP or memory format.
the dSaveImageJPEG function: the image will be saved in JPEG format or in memory.
the dSaveImagePNG function: the image will be saved in PNG format or in memory.

Drawing in browser code

The image saved in memory can be directly assigned to an Image control. Depending on the browser used, the result may not be the expected one.

For example, with the current version of FireFox (available when this documentation was published), images in GIF format are not displayed properly.

This may be fixed in future browser updates.

Drawing in PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting providers and therefore it is always enabled. The version of the GD library must be version 2.0.28 (or later). This library can be downloaded from the PHP site.

To enable (if necessary) this library locally, the following elements are required:

PHP installed.
the PHP.INI file found in the Windows directory must contain the following line: "extension=php_gd2.dll" (instead of ";extension=php_gd2.dll").
the php_gd2.dll file must exist in the directory of PHP extensions. This directory is defined in the PHP.INI file by the "extension_dir" variable.

Component: wd300pnt.dll