A Developer. An Eweek. I'm not english and sorry for my errors :P I am writing to ask you to help.
I googled but found only functions that are not complete or not really based on 64bit. Comparing them with many generators online, never gave the correct encoding. Can anyone help me? Complete samples do exist Here's a link to one by a very reputable coder here. I based my current Base64 routines off of his. Insomnia is just a byproduct of, " It can't be done" Classics Enthusiast? Here's my Mustang Mach I Fastback. Her sister '67 Coupe has been adopted Newbie?
Spend a few minutes browsing the FAQ section of the forum. The name of the module was Base64MimeCoding. My contemporary VB6 project is approaching 1, modules. To all, peace and happiness.
Borenstein, et al. Divide the 24 bits of a 3-byte block into 4 groups of 6 bits. Map each group of 6 bits to 1 printable character, based on the 6-bit value.
Base64 (MIME) Encode and Decode Tool
They will be ignored by the decoding process. Example 1 : Input data, 1 byte, "A". Hi, how quick memo disappeared use the functions in the module? CreateElement "dummy". Curabitur facilisis consectetur massa, sit amet aliquam lacus cursus vel. Despite the dire warnings they use to try to make you use. Base64Encode StrConv Text1. Base64Decode Text2. NET VB.
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Base64 Encoding from C#
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View Solution Only. Commented: Author Commented: The function works fine. Is there an algorythm written in a vba function that does the same thing? You like to have structures from XML library in vba?
For the project the algorythm is what I was looking for to endcode and decode. May be your base64 string is wrong or you've used some other function? Not the solution you were looking for? Getting a personalized solution is easy.
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Explore More Content Explore courses, solutions, and other research materials related to this topic. Our Company Why EE? Experts Exchange Take hold of your future.A Developer. An Eweek. On my machine it'll do around 2MB a second encoding and 1MB a second decoding. The zip file contains both a class version a little slower because of the overhead and a module version. EDIT: Orig. Last edited by Comintern; Jul 10th, at AM.
Print "Data integrity test passed! Print "Data integrity test failed! Reason being, the string is passed to the encoder ByRef and is padded with nulls so that it's length is divisible by 3.
That means that the string that is actually encoded correctly, but when you look for equity later in the test code you aren't comparing against what was actually encoded. You can verify this by explicitly passing the strings to the encoding functions ByVal or passing it a copy of the string. I would like to thank you for making me take a look at this again--there was an error that my testing didn't catch dealing with how the end padding key is placed when the encoded data ends with a CrLf.
That just needed a little one-line fix. Here's my test code, random length strings between 1 and characters. Chinese to be precise.
It doesn't work. This should encode any binary file, so the language of the file shouldn't be relevent. If it is used to encode unicode strings, you will need to compensate for the implicit unicode conversions that VB6 performs. Can you post a sample file for me to test with? Your code looks good, but I am having trouble using it to encode data from a binary file in VB6. Have tried bunch of different ways to get the data out of the file and into a string to give to your encoder function, but the base64 comes back wrong.
Could you post some VB6 example code as to how to do this?Converts the value of an array of 8-bit unsigned integers to its equivalent string representation that is encoded with base digits. Converts a subset of an array of 8-bit unsigned integers to its equivalent string representation that is encoded with base digits.
Parameters specify the subset as an offset in the input array, the number of elements in the array to convert, and whether to insert line breaks in the return value. Parameters specify the subset as an offset in the input array, and the number of elements in the array to convert. Converts an array of 8-bit unsigned integers to its equivalent string representation that is encoded with base digits.
You can specify whether to insert line breaks in the return value. Converts the 8-bit unsigned integers inside the specified read-only span into their equivalent string representation that is encoded with base digits. You can optionally specify whether to insert line breaks in the return value. InsertLineBreaks to insert a line break every 76 characters, or None to not insert line breaks.
The string representation in base 64 of length elements of inArraystarting at position offset. The following example demonstrates the ToBase64String method. The input is divided into groups of three bytes 24 bits each. Consequently, each group consists of four 6-bit numbers where each number ranges from decimal 0 to In this example, there are 85 3-byte groups with one byte remaining.
The first group consists of the hexadecimal values 00, 01, and 02, which yield four 6-bit values equal to decimal 0, 0, 4, and 2.
Those four values correspond to the base digits "A", "A", "E", and "C" at the beginning of the output. If an integral number of 3-byte groups does not exist, the remaining bytes are effectively padded with zeros to form a complete group. In this example, the value of the last byte is hexadecimal FF. The elements of the inArray parameter are taken as a numeric value and converted to a string representation in base The offset and length parameters are bit signed numbers.
The offset parameter is zero-based. The ToBase64String method is designed to process a single byte array that contains all the data to be encoded. To encode data from a stream, use the System. ToBase64Transform class. If the options parameter is set to InsertLineBreaks and the output of the conversion is longer than 76 characters, a line break is inserted every 76 characters.
The elements of inArray are taken as a numeric value and converted to a string representation in base The string representation in base 64 of the elements in inArray. The following example calls the Convert. InsertLineBreaks argument to insert line breaks in the string that is produced by encoding a element byte array.
As the output from the example shows, the Convert. FromBase64String succeeds in restoring the original byte array; the line break characters are ignored during the conversion. Because line breaks are considered white-space characters in a base encoding, they are ignored when converting a base encoded string back to a byte array.
The line breaks are simply convenient when displaying the encoded string to a control or a device such as a console window. The string representation, in base 64, of the contents of inArray. The following example uses the ToBase64String Byte method to convert a byte array to a UUencoded base string, and then calls the FromBase64String String method to restore the original byte array.
The following is a more complex example that creates a element array of bit integers.If you've done anything long term in the Web industry, it's likely that you will have come across "Base64 Encoding" at some point. Base64 is the encryption format used by browsers when implementing very simple username and password form of basic authentication.Maldoc VBA: Decoding With Excel
If you ask anyone these days, however, for a serious point of view on using it, you'll likely get laughed at. Base64 is a two-way cipher; so as long as you have the original phrase, it's easy to reverse it back and get the original text back out of it.
Well, it turns out that Base64 encoding actually does still have one very good use.
It's great for encoding complex binary files and data into a very simple textual representation that transmits exceptionally easy across text-based protocols such as HTTP.
Yes it does, but let's imagine for a moment you wanted to try and save a few requests in your latest ASP. What you could do is to embed your images directly into your Web page and then transmit them all at the same time when delivering the original page. If you're in any doubt about the validity of this scheme, take a look at the source for Google's current search page. You'll see something like this:.
Figure 1: Google search uses Baseencoded images. Pay close attention to the section in the red rectangle. That's the Google logo that displays front and center in the page when you load it. Because the images are essentially loaded with the page, the display is instantaneous when your browser loads the view.
What you're looking at is something called a "base 64 encoded data URL. The fun part about this is that. NET includes very easy to use routines for you to generate these Base64 strings. Because the strings are plain text, you also can easily send them using simple text transmission services such as SMS text messages on a mobile phone.
Figure 2: The output from out Base64 test. Figure 3: The output from our Base64 decode test. If you look at the two code samples, you'll see that they operate on byte arrays. We convert the string to bytes, then encode it, and the decoder takes the string and produces an array of byte containing the decoded contents.
Figure 4: Beware; Base64 encoding will produce large outputs. The trade off here is that you get instant image loading in exchange for inflating your page size slightly. What you don't want to be doing is using this for massive detailed images.
Where it does shine is if your Web server is compressing output before delivering it. Because of the nature of Base64, it compresses exceptionally efficiently, so a dense amount of data like that will squash down to a very small size.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Are there any built-in functions or COM objects available which will do this as a pure VBA approach is either complex or doesn't scale well at these volumes see links from dbb and marxidad?
This code works very fast. It comes from here. Learn more. Ask Question. Asked 11 years, 6 months ago. Active 1 year, 9 months ago. Viewed 92k times. Matthew Murdoch Matthew Murdoch I liked dbb code and I have one more full example posted here: stackoverflow. Is there any solution to this encoding a Unicode string? Active Oldest Votes. Mark Cidade Mark Cidade These could be in If lTemp Then Call Err.
First question that probably comes to mind; what the heck do you want to use something like this for? Well, I actually had two cases where I used it. NOTE: Sending files through firewalls this way is a way to circumvent security measures, please be carefull when using this. If you choose to use it, you will bear sole responsibilty for it. Use at your own risk! The code consists of two classes, the main class does the encoding and contains a collection of items bools, strings, blobs, etc.
The items in the collection are based upon the second class. When working with the class, you can just provide the full text of the container for example an emailspecific start and end markers are used to find the datablock inside the text. When adding or changing data, only the block between the markers is updated, the remainder is left unchanged. The download downloaded times contains a Word document which includes all VBA code including the other code required; Chip Pearsons, and some generic stuff found elswhere on my site.
Thank you for this excellent code! This really helps! Though it should not be very hard to adapt the code to be Base64 compliant.
Yes, I understood this from the post and the code, but it puts me a LOT closer to my objective. This is then passed to a PHP page as a parameter to send the message via web service. When encoding, all data elements are converted to string values and concatenated to one big string. So far everything is just a regular string. Each individual line string is then encoded to a non-standard form of Base64 using the function EncodeString.
All the lines together are the entire datablock, which will get a custom header and footer to be able to identify the block inside a larger textblock.
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