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New WINDEV, WEBDEV, WINDEV Mobile 24 feature!
  • Displaying a PNG image
  • Transparent image in PNG format
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Stored procedures
Saves an image found in an Image variable:
  • in a file in PNG format.
  • in memory.
Notes:
  • The border of the Image control (if it exists) is also saved.
  • This function can only be used to save the images for screen resolutions up to 32 bits.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Example
MyImage is Image = "Test.gif"
// Saves the image found in MyImage in "C:\Documents\Image.PNG"
ResSave = Mymage.SavePNG("C:\Documents\Image.PNG")
MyImage is Image = "Test.gif"
// Saves the image contained in MyImage in memory
ResSave = MyImage.SavePNG(inMemory)
Syntax
WINDEVWEBDEV - Server codeReports and QueriesAndroidiPhone/iPadUniversal Windows 10 AppJavaAjaxUser code (UMC)

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

<Result> = <Image variable>.SavePNG(<File name> [, <Transparency color>])
<Result>: Boolean
  • True if the image was saved,
  • False otherwise. To find out the error details, use ErrorInfo associated with the errMessage constant.
<Image variable>: Image variable
Name of the Image variable to use.
<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 corresponds to:If this parameter is not specified, the generated image is not transparent.
Universal Windows 10 App Syntax not available

Saving an image in memory Hide the details

<Result> = <Image variable>.SavePNG(<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 variable>: Image variable
Name of the Image to use.
<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 corresponds to:
If this parameter is not specified, the generated image is not transparent.
Android This parameter is ignored.
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:
MyImage is Image = "Test.gif"
MyImage.StartDrawing(dWithOpacity)
MyImage.ChangeMode(drawDefault)
FOR nI = 0 _À_ MyImage..Width
FOR nJ = 0 _À_ MyImage1..Height
 MyImage.DrawPoint(nI, nJ, RGB(255,255,255), 0)
END
END
MyImage.Pen(RGB(100, 020, 200), 0,10, 100)
MyImage.DrawLine(10, 10, 100, 10)
MyImage.SavePNG(CompleteDir(fExeDir()) + "img.png")
Component : wd240pnt.dll
Minimum version required
  • Version 24
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