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Office files are usually zip containers, so adding them in binary would prevent any sane way of diffing. automatically generate cell values based on more complex calculations.Ī major problem when developing macros is version control. As VBA is extremely easy to learn if you don't have a programming background, users quickly adopted and combinded injected functions and classes to Subs and Functions to e.g. To interact with the application, macro hosts "inject" functionality into the VBA interpreter, like the Range function in Excel, which can be used to access a collection of cells. These scripts happen to be generated in Visual Basic, or - to be more specific - Visual Basic for Applications (VBA). Internally the macro host would create a "script" of what's happening and interpret it later. For this, users could record macros, which would then repeat what they did earlier. Macros were originally conceived to save the user from repeating the same task over and over again. You could argue that macros are obsolete by now and coding them in Visual Basic isn't cool when you could use any modern programming language instead, but the concept behind them is pretty neat in fact. Now, how do we make Excel answer our requests? Microsoft Office comes with a really cool toolbelt called macros, which people now hate because of ransomware. In our client, we'd then evaluate the status code, headers and response text after parsing everything again.
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A very basic request might look like this:Įnter fullscreen mode Exit fullscreen mode Deep down, every http request consists of a TCP connection, where the client and server exchange various messages and eventually close the connection. When using express or ASP.NET, we usually think about http routes and request bodies, but we never really care about how requests are handled inside the framework. NEW: Webxcel also supports PHP - see Excel'ing at PHP. If you can't wait to read through the source, you can check out the repository webxcel, which I will refer to throughout this article. This article consists of three main parts, an introduction to webserver internals, getting Excel to answer http requests and adding some special sauce to make it a RESTful backend. Since I just recently finished my bachelor's thesis and had some spare time, I thought I'd give it a shot and see how far I'd get. NET, the idea of using Excel as a backend fascinated me. ExecuteAsync Request, "Handler.When my coworkers and I discussed backend technologies for an upcoming project, someone jokingly mentioned Excel as people widely misused it as a terrible database replacement. ExecuteAsync Request, "Handler.Simple" ' -> Simple called later with response ' If you need to pass state to callback, use CallbackArgs Dim Args As Variant Args = Array ( "abc", 123 ) Wrapper. Client = Client Dim Request As New WebRequest Request. BaseUrl = "" ' Wrapper needs Client to execute requests Dim Wrapper As New WebAsyncWrapper Set Wrapper. End Sub Dim Client As New WebClient Client. End Sub Public Sub WithArgs ( Response As WebResponse, Args As Variant ) '. Usage: ' Module: Handler Public Sub Simple ( Response As WebResponse ) '. Note Windows-only and Excel-only and requires reference to "Microsoft WinHTTP Services, version 5.1" Wrapper WebClient and WebRequest that enables callback-style async requests Useful for setting internal cURL options ( cURL Docs) WebAsyncWrapper
GUIDE TO REST API VBA UPDATE
Hook for update cURL command before send.
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PrepareCurl PrepareCurl(Client, Request, Curl) Client RegisterConverter "image", "image/jpeg", _ "ImageConverter.ConvertToImage", "ImageConverter.ParseImage", _ ParseType : = "Binary" End Function Function ConvertToImage ( Value As Variant ) As String '. Pass raw binary value to ParseCallback ' - ' Module: ImageConverter Function ParseImage ( Bytes As Variant ) As Object '. RegisterConverter "csv", "text/csv", _ "ConvertToCSV", "ParseCSV", Instance : = Converter ' 3. Dim Converter As New CSVConverterClass WebHelpers. Use object instance functions for Convert and Parse ' - ' Object: CSVConverterClass ' same as above. RegisterConverter "csv", "text/csv", _ "CSVConverter.ConvertToCSV", "CSVConverter.ParseCSV" ' 2. End Function Function ConvertToCSV ( Value As Variant ) As String '. Use global module functions for Convert and Parse ' - ' Module: CSVConverter Function ParseCSV ( Value As String ) As Object '. Set ParseType = "Binary", otherwise "String" is used. If the ParseCallback needs the raw binary response value (e.g. If the ConvertCallback or ParseCallback are object methods, Register custom converter for converting request Body and response Content.
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Optional "String" (default) or "Binary" to pass raw binary response to ParseCallback RegisterConverter RegisterConverter(Name, MediaType, ConvertCallback, ParseCallback,, ) Name