- Convert String to ANSI Byte Array
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- How to: Convert Strings into an Array of Bytes in Visual Basic
Convert String to ANSI Byte Array
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VB6 stores its strings internally in "Unicode" format, two bytes per character, but the StrConv function will convert to an array of bytes encoded in "ANSI" format using your default code page. Default encoding uses the default code page on your system which is usually Western European but may be different on your setup. If you want ISO Latin-1 you can replace. Default with. GetEncoding code page is ISO which is identical to Windows except for characters in the range 0x80 to 0x9F. Alternatively use System.
Byte arrays are somewhat special because Visual Basic lets you directly assign strings to them. In this case, Visual Basic performs a direct memory copy of the contents of the string. Because all Visual Basic 5 and 6 strings are Unicode strings two bytes per character , the target array is redimensioned to account for the actual string length in bytes which you can determine using the LenB function. If the string contains only characters whose code is in the range 0 through the case if you work with Latin alphabets , every other byte in the array will be This special treatment reserved for Byte arrays is meant to ease the conversion from old Visual Basic 3 applications that use strings to hold binary data, as I explained in "The Byte Data Type" section, earlier in this chapter. You can exploit this feature to create blindingly fast string routines when you have to process each individual character in a string.
This page shows how to handle arrays of the Byte type compared to the simpler operations we know how to do with the String type. We've not seen this trick of using StrConv with an empty string documented anywhere. We discovered it by accident. But it works. To comment on this page or ask a question, please send us a message. See Comparing Byte arrays below. EmptyArray: '
Use the StrConv function with "vbFromUnicode" to convert a Visual Basic string to a byte array of ANSI characters. Dim company As String Dim b() As Byte.
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A Developer. An Eweek. Lets say i have string "Hello world" and i want to convert it, copy it to byte array. Do you want each character's ascii value to be assigned to the corresponding array element? Print b i Next Lottery is a tax on people who are bad at maths If only mosquitoes sucked fat instead of blood To do is to be Descartes.
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How to: Convert Strings into an Array of Bytes in Visual Basic