![]() ![]() Will fail with an Unable to load CLR Instance error in the Load() method like this: Running this most basic code: DO wwDotnetBridge When wwDotnetBridge is run with a blocked wwDotnetBridge.dll file you will get an error. What Blocking looks like with wwDotnetBridge NET Runtime/AppDomain as the runtime entry point assembly, it checks the Zone Identifier and refuses to load the dll. NET Runtime as part of hte bootstrapping process does care about Zone Identifiers, so when wwDotnetBridge passes wwDotnetBridge.dll to the. For example, even when marked as 'blocked', wwIPStuff.dll works just fine in FoxPro without first unblocking. It turns out FoxPro doesn't care about it and I can reference a DECLARE DLL and it works just fine. How that Zone indicator is used is up to the host application. Once the zone identifier exists it's moved along with the file if you copy it to another location on the local drive. If you download a Zip file, the contents of the Zip file - any executables - are marked as well. When you download a file to your Downloads folder and that adds the Zone Identifier alternate data stream in yourfile.dll:Zone.Identier. This is a 'protection' feature of Windows, which associates a Zone Identifier stream with a given file name using something known as Alternate Data Streams (ADS). Better late than never ? What's the Problem? Blocked files and wwDotnetBridgeįor wwDotnetBridge blocked files are a big problem, because if you download wwDotnetBridge from Github or from West Wind Client Tools you are downloading a Zip file which when unzipped creates - you guessed it - blocked DLL files. That is until today - I'm happy to say that I've found a solution to this problem. It's a big fail and while there are easy solutions, to date I hadn't been able to automate it away. NET over an AppDomain boundary, which in turn causes wwDotnetBridge to fail to load the. ![]() This issue is caused by files downloaded from the Internet either directly or in a Zip file that Windows has marked as Blocked.Ī blocked file cannot be loaded into. Glowing features aside, in this post I'm talking about the #1 problem that surrounds wwDotnetBridge which is the dreaded Windows File Blocking Issue. NET Runtime in FoxPro and provides a Proxy wrapper that can create instances of objects, call static methods, handle events, access generic members, deal with arrays and collections efficiently and provides a ton of helpers to access features of. NET from FoxPro without requiring COM instantiation. If you arrived here and don't know what wwDotnetBridge is, it's a bridge interface for accessing. In this post I'll talk about Windows Download File Blocking due to Zone Identifier marking, along with a solution on how to programmatically unblock files easily, the fix for which will start showing up in version 6.22 of wwDotnetBridge going forward. This is kind of a 'good to know' technical post that discusses some backround information around wwDotnetBridge and one of the biggest issues with using it.
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