使用Objective Sharpie为OpenCV 3.4 iOS库生成C#绑定失败求助

Let's break down the problems you're facing and walk through practical solutions to generate valid C# bindings for OpenCV 3.4's iOS framework.

Core Issues Identified #

1. Sharpie expects a framework umbrella header named [FrameworkName].h (in your case opencv2.h), but OpenCV uses opencv.hpp instead.
2. Directly binding the .a file fails because Sharpie needs header files to parse the API, not just the binary.
3. Binding the raw opencv.hpp file breaks because Clang can't resolve the opencv2/... include paths without explicit search directories.

Solution 1: Match Sharpie's Default Umbrella Header Expectation #

This is the simplest fix—we'll create a dummy umbrella header that points to OpenCV's actual opencv.hpp:

1. Navigate to opencv2.framework/Headers
2. Create a new file named opencv2.h with this content:

   #include "opencv.hpp"
   

3. Return to the directory containing opencv2.framework, then run:

   sharpie bind -sdk iphoneos11.2 -framework opencv2.framework
   

Sharpie will now find its expected umbrella header, which seamlessly forwards to OpenCV's real header file.

Solution 2: Explicitly Specify Umbrella Header & Include Path #

If you don't want to modify the original framework, use this command to directly target opencv.hpp and tell Clang where to find dependent headers:

sharpie bind opencv2.framework/Headers/opencv.hpp \
  -sdk iphoneos11.2 \
  -I opencv2.framework/Headers \
  -namespace OpenCV \
  -output OpenCVBindings

• -I opencv2.framework/Headers: Fixes the "file not found" errors for opencv2/xxx.hpp includes
• -namespace OpenCV: Sets a clean C# namespace for your bindings
• -output OpenCVBindings: Organizes generated files into a dedicated directory

Solution 3: Handling Source-Compiled OpenCV Frameworks #

If you built OpenCV from source with extra modules:

1. Double-check your build configuration ensures the opencv.hpp umbrella header is generated in the framework's Headers directory
2. Verify all module headers are nested under the opencv2 subdirectory inside Headers
3. Apply either Solution 1 or 2 above to generate bindings

Post-Generation Notes #

OpenCV has a lot of complex C++ constructs (templates, macros, custom types) that Sharpie might not parse perfectly. After generating the bindings, you'll likely need to:

• Clean up errors in ApiDefinitions.cs (e.g., remove unsupported template syntax, adjust type mappings)
• Fix enum or struct definitions in StructsAndEnums.cs that were misinterpreted
• Add [Static] or [Internal] attributes where needed to resolve binding conflicts

内容的提问来源于stack exchange，提问作者ConstantLearning