Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom GDI+ class
Storing content of the Clipboard to a bitmap file
How to print FoxPro form
Storing screen shot of a form to bitmap file
How to print a bitmap file
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Displaying icons in the system tray (VFP9)
GDI+: Implementing image scrolling with inertia
Vertical Label control
Displaying dimmed window behind VFP top-level form
Splash Screen for the VFP application
Monitoring clipboard content changes (VFP9)
Pocket PC: custom RAPI class for operating with files and folders on mobile device
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Obtaining names and positions for shortcuts located on the Windows Desktop
Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
Reading the structure of VFP main menu
Custom HttpRequest class (WinINet)
GDI+: sending image of FoxPro form to printer
How to ping a remote site using IP Helper API calls
Loading a string resource from an executable file
How to make a VFP form fading out when released (GDI version)
Printing Image File, programmatically set print page orientation to landscape
How to view icons stored in executable files (Icon Viewer) - II
How to perform Base64 encoding/decoding using Cryptography API Functions

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#DEFINE CRYPT_STRING_BASE64 0x0001
#DEFINE CRYPT_STRING_NOCRLF 0x40000000
#DEFINE CRYPT_STRING_NOCR 0x80000000

DO declare
SET MEMOWIDTH TO 120

LOCAL cBuffer, cEncoded, cDecoded

TEXT TO cBuffer NOSHOW
Base cryptographic functions provide the most flexible means 
of developing cryptography applications. All communication 
with a cryptographic service provider (CSP) occurs through 
these functions.

A CSP is an independent module that performs all cryptographic 
operations. At least one CSP is required with each application 
that uses cryptographic functions. A single application can 
occasionally use more than one CSP.
ENDTEXT

cEncoded = ToBase64(m.cBuffer)
? cEncoded

cDecoded = FromBase64(cEncoded)
? cDecoded

* end of main

FUNCTION ToBase64(cSrc)
    LOCAL nFlags, nBufsize, cDst
    nFlags=CRYPT_STRING_BASE64

    nBufsize=0
    = CryptBinaryToString(@cSrc, LEN(cSrc),;
        m.nFlags, NULL, @nBufsize)

    cDst = REPLICATE(CHR(0), m.nBufsize)
    IF CryptBinaryToString(@cSrc, LEN(cSrc), m.nFlags,;
        @cDst, @nBufsize) = 0
        RETURN ""
    ENDIF
RETURN cDst

FUNCTION FromBase64(cSrc)
    LOCAL nFlags, nBufsize, cDst
    nFlags=CRYPT_STRING_BASE64

    nBufsize=0
    = CryptStringToBinary(@cSrc, LEN(m.cSrc),;
        nFlags, NULL, @nBufsize, 0,0)

    cDst = REPLICATE(CHR(0), m.nBufsize)
    IF CryptStringToBinary(@cSrc, LEN(m.cSrc),;
        nFlags, @cDst, @nBufsize, 0,0) = 0
        RETURN ""
    ENDIF
RETURN m.cDst

PROCEDURE declare
    DECLARE INTEGER CryptBinaryToString IN Crypt32;
        STRING @pbBinary, LONG cbBinary, LONG dwFlags,;
        STRING @pszString, LONG @pcchString

    DECLARE INTEGER CryptStringToBinary IN crypt32;
        STRING @pszString, LONG cchString, LONG dwFlags,;
        STRING @pbBinary, LONG @pcbBinary,;
        LONG pdwSkip, LONG pdwFlags

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1772 bytes  
Created: 2001-08-03 12:00:00  
Modified: 2015-10-28 09:29:17  
Visits in 7 days: 47  
Listed functions:
CryptBinaryToString
CryptStringToBinary
Printer friendly API declarations
My comment:
Starting VFP8, base64 conversion can be performed with STRCONV().

In my tests, API routines presented on this page encoded and decoded strings approximately 2 times faster than STRCONV() did -- on 100K cycles 3.7 seconds vs. 7.7 seconds.

* * *
This is an output from call to CryptBinaryToString with dwFlags set to CRYPT_STRING_HEXASCIIADDR (0x000b). Can make a good starting point for developing a simple binary viewer.


* * *
From Burkhard Stiller`s VFP Blog:
Another way to encode and store picture-data inside your classes -- relates to base64 encoding, and is an interesting sample of code by itself.
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