Vb6 Read Binary File Into Byte Array

• Vb6 Array Example
• Vb6 Array Size
• Vb6 Read File

Doing cryptographic operations in Classic Visual Basic 6 and VBA is tricky because VB6 doesn'thave unsigned types (except the Byte type).That da*n sign bit keeps messing things up. A simple operation in C likex<<=8 is not a simple matter with a Long variable in VB6.Try this experiment:

This will 'carry over' the sign bit into the high word and print:Which is not what we expect. The correct way is to append an ampersand (&) to cast it as a proper long:Likewise, migrating values from string types to bytes and words has itsdifficulties.To convert back-and-forth between

Jun 24, 2008 Read and Write Binary Files in VB6, VBScript, ASP. The Chilkat FileAccess ActiveX is a freeware component that may be used to read and write binary files in VBScript, ASP, VB6, etc. Here are some sample code fragments: VBScript. How to read a file in VB - Part 2 - VB6, Binary mode (Get). Visual Basic 4 / 5 / 6 Insights on Bytes. This self-contained routine can be pasted into a code module and called from anywhere, including the immediate window. Allows you to request that the file contents be dumped as one big string (appropriate for a text file) or byte. VB.Net - Binary Files. Reads the specified number of bytes from the current stream into a byte array. Creating Binary Files using Visual Basic. When a binary file is opened the file pointer is positioned at byte. The entire file is read into an array of UDTs. How to read a binary file into 2D array. Converting file into byte array important.

String typesand

Vb6 Array Example

Byte arrays, use the built-in VBAStrConv() function.This should produce the results:

Note how the StrConvfunction avoids the need to declare the size of the byte array beforehand.(Thanks to Robert Garofalo for pointing out this useful function).For more information see Using StrConv with ANSI, DBCS and Unicode charactersets.

If you want to convert to a byte array without the Unicode conversion,do this:

This will produce the result:This time, we get two bytes for each Unicode character.See Microsoft Knowledge Base Article - 187675 HOWTO: Copy a String to a Byte Array Without Unicode Conversionfor more details.

If you want the string encoded in UTF-8, seeHow to convert VBA/VB6 Unicode strings to UTF-8.

Vb6 Array Size

VB6/VBA Code

The functions provided here inbasConvert andbasUnsignedWordcan help you manage some of these issues in your code.Thanks to Ernie Gibbs for pointing out a subtle error in basUnsignedWord.uw_WordAdd (2008-06-25).The code in basConvert replaces the now supersededbasByteUtilswith better and faster dynamic arrays.However, the functions in basByteUtils are still useful for ASP and VBScript applications.The source code to these three files is in binaryutils.vb6.zip (9 kB).

Note: Users with operating systems that are set up to use full 32-bit Unicode OS or oriental CJK charactersmay need to do a global replace of Asc() and Chr() with AscW() and ChrW() in the basConvertand basByteUtils functions above. Thanksto David Wolf of Intuit Information Technology Solutions for this tip.

For more hints on how to use arrays of the Byte type in Visual Basic 6 compared to thesimpler String type, see Using Byte Arrays in VB6/VBA.

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This page last updated 12 December 2019

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