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  • Displaying a PNG image
  • Transparent image in PNG format
  • Pattern and PHP
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Stored procedures
Saves an image:
  • in a file in PNG format.
  • in memory.
This image corresponds to the image contained in one of the following elements:
  • in an Image control.
  • in an Image variable.
    PHP This type of variable is not available.
  • in a Bar Code control.
    PHP 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.
  • The border of the Image control (if it exists) is also saved.
    Reminder: The border of the Image control is defined in the "Style" tab of the description window of control.
  • 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 the reports.
// Saves the image found in "IMG_ImageDrawing" in "C:\Documents\Image.PNG"
ResSave = dSaveImagePNG(IMG_ImageDrawing, "C:\Documents\Image.PNG")
// Saves in memory the image found in "IMG_ImageDrawing"
ResSave = dSaveImagePNG(IMG_ImageDrawing, inMemory)
Syntax
Reports and QueriesJavaUser code (UMC)PHPAjax

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

<Result> = dSaveImagePNG(<Image name> , <File name> [, <Transparency color>])
<Result>: Boolean
  • True if the image was saved,
  • False otherwise. To get the details of the error, use ErrorInfo with the errMessage constant.
<Image name>: Character string (with or without quotes) or Image variable
  • Name of the Image control, Bar Code control or Web Camera control to save. The Image controls found in a report cannot be used.
  • Java Name of the Image control to use.
  • Name of the Image variable to use.
    PHP This type of variable is not available.
<File name>: Character string (with quotes)
Name and full (or relative) path of PNG 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 PNG file is not checked. This file is automatically overwritten if it already exists.
<Transparency color>: Optional integer
Color that will be considered as being transparent in the image. This color can correspond to:If this parameter is not specified, the generated image is not transparent.

Saving an image in memory Hide the details

<Result> = dSaveImagePNG(<Image name> , <inMemory> [, <Transparency color>])
<Result>: Buffer
Byte string containing the image in PNG 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), ...
<Image name>: Character string (with or without quotes) or Image variable
  • Name of Image control, Bar Code control or Web Camera control to use. The Image controls found in a report cannot be used.
  • Java Name of the Image control to use.
  • Name of the Image variable to use.
    PHP This type of variable is not available.
<inMemory>: Constant
inMemory: Constant used to save an image in memory.
<Transparency color>: Optional integer
Color that will be considered as being transparent in the image. This color can correspond to:If this parameter is not specified, the generated image is not transparent.
Remarks

Displaying a PNG image

Caution: If the image in PNG format is semi-transparent, the display of the image is slower.

Transparent image in PNG format

To save a transparent image in PNG format, the Image control must be filled with the transparent color beforehand.
Example used to draw a transparent line and to save it in PNG format:
dStartDrawing(IMG_Image1, dWithOpacity)
dChangeMode(drawDefault)
FOR nI = 0 _TO_ IMG_Image1..Width
FOR nJ = 0 _TO_ IMG_Image1..Height
 dPoint(nI, nJ, RGB(255,255,255), 0)
END
END
dPen(RGB(100, 020, 200), 0,10, 100)
dLine(10, 10, 100, 10)
dSaveImagePNG(IMG_Image1, CompleteDir(fExeDir()) + "img.png")
PHP

Pattern and PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting companies 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: wd260pnt.dll
Minimum version required
  • Version 9
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