TImageBase64

Source: source/classes/imageb64.prg

Standalone utility class

TImageBase64 is a utility class that encodes images to Base64 for use in web pages (HTML <img> tags with data URIs). It can also extract and save images from Base64-encoded HTML. The class auto-detects whether the input source is a file path, URL, or plain text.

Key DATA Members

DATA	Type	Description
`aImage`	Array	Internal image array from FW_ReadImage
`cFile`	Character	Source file path or URL (if applicable)
`cBase64`	Character	Base64 encoded image string
`lTag`	Logical	Include `<img>` tags in output
`lHtml`	Logical	Generate full HTML document in output
`lUrlEncode`	Logical	URL-encode the data URI instead of plain base64
`nImgWidth`	Numeric	Image width in pixels (ACCESS readonly)
`nImgHeight`	Numeric	Image height in pixels (ACCESS readonly)

Methods

Method	Description
`New( cSource )`	Create object; optionally load source immediately
`SetSource( cSource )`	Set source: auto-detects file, URL, or base64 text
`ChooseFile()`	Open file picker dialog to select an image
`Paste()`	Load image from clipboard
`MakeText( lUrlEncode, lTag, lHtml, cTitle )`	Generate output text (data URI or HTML)
`SaveText( cFile, lUrlEncode, lTag, lHtml )`	Save output text to file; returns filename or nil
`CopyText( lUrlEncode, lTag, lHtml )`	Copy output text to clipboard; returns the text
`SaveImage()`	Save the decoded image to a file (.jpg or .png)
`TestHTML()`	Generate a test HTML file and open it in the browser

Example: Image to Base64 HTML Tag

#include "FiveWin.ch"

function Main()

   local oImg := TImageBase64():New( "c:\images\photo.jpg" )

   // Generate an HTML img tag with inline base64 data
   oImg:lTag := .T.
   oImg:CopyText()   // copies to clipboard

   // Or save as a complete HTML file
   oImg:lHtml := .T.
   oImg:SaveText( "preview.html" )

   // Open in browser to test
   oImg:TestHTML()

return nil

Notes

The source auto-detection checks: file path (<=255 chars, exists on disk), HTTP/HTTPS URL, or base64-encoded text.
Use Paste() to grab an image directly from the Windows clipboard (bitmap, file list, or PNG format).
The nLineWidth class data (default 1024) controls line breaking in the base64 output.
Supported output formats: data:image/... URIs, <img> tags, or full HTML documents.

TImageBase64

Key DATA Members

Methods

Example: Image to Base64 HTML Tag

Notes

See Also