


Here are a few question-based titles that capture the essence of your article: * **How Can I Dynamically Load an Exported C Class?** (This directly addresses the core question of the content) * **
Oct 25, 2024 pm 05:28 PMDynamically Loading an Exported C Class
While exporting functions from a DLL is straightforward using __declspec(dllexport), handling class exports can be more complex.
Dynamic Loading using LoadLibrary()
Dynamically loading a class at runtime is not directly supported. Instead, consider using one of the following options:
- Factory Function: Create objects using a specialized factory function that dynamically hooks them to their DLL offsets.
- Delay-load DLL: Employ a delay-load DLL that is loaded after program initiation.
Compile-Time Linking Using Header and Library
For compile-time linking, use the following approach:
- Declare the class in the exported header file (e.g., class_decl.h).
- Export the class symbol using preprocessor macros (e.g., EXPORT_CLASS).
- Create an import library for dynamic linking (e.g., class_decl.lib).
- Link the application executable with the import library.
Preprocessor Technique for Exporting Class Symbol
<code class="cpp">#ifdef _WIN32 #ifdef CLASS\_DECL\_EXPORT #define EXPORT\_CLASS __declspec(dllexport) #else #define EXPORT\_CLASS __declspec(dllimport) #endif #else #define EXPORT\_CLASS #endif class EXPORT\_CLASS MyClass { // ... };</code>
Additional Considerations
- Implicit linking (using the preprocessor technique) provides a simpler and more reliable solution compared to late-binding using LoadLibrary().
- If dynamic loading of a class is essential, consider using the factory function or delay-load DLL approach.
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