forked from 0ad/0ad
70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
#ifndef INCLUDED_DLLLOADER
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#define INCLUDED_DLLLOADER
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#include "ps/Errors.h"
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ERROR_GROUP(DllLoader);
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ERROR_TYPE(DllLoader, DllNotLoaded);
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ERROR_TYPE(DllLoader, SymbolNotFound);
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class DllLoader
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{
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public:
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/**
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* Prepare the DLL loader. Does no actual work.
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*
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* @param name base name of the library (from which we'll derive
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* "name.dll", "libname_dbg.so", etc). Pointer must remain valid for
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* this object's lifetime (which is fine if you just use a string literal).
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*/
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DllLoader(const char* name);
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~DllLoader();
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/**
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* Attempt to load and initialise the library, if not already. Can be harmlessly
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* called multiple times. Returns false if unsuccessful.
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*/
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bool LoadDLL();
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/**
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* Check whether the library has been loaded successfully. Returns false
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* before {@link #LoadDLL} has been called; otherwise returns the same as
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* LoadDLL did.
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*/
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bool IsLoaded() const;
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/**
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* Unload the library, if it has been loaded already. (Usually not needed,
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* since the destructor will unload it.)
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*/
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void Unload();
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/**
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* Attempt to load a named symbol from the library. If {@link #IsLoaded} is
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* false, throws PSERROR_DllLoader_DllNotLoaded. If it cannot load the
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* symbol, throws PSERROR_DllLoader_SymbolNotFound. In both cases, sets fptr
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* to NULL. Otherwise, fptr is set to point to the loaded function.
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*
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* @throws PSERROR_DllLoader
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*/
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template <typename T>
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void LoadSymbol(const char* name, T& fptr) const;
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private:
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// Typeless version - the public LoadSymbol hides the slightly ugly
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// casting from users.
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void LoadSymbolInternal(const char* name, void** fptr) const;
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const char* m_Name;
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void* m_Handle;
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};
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template <typename T>
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void DllLoader::LoadSymbol(const char* name, T& fptr) const
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{
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LoadSymbolInternal(name, (void**)&fptr);
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}
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#endif // INCLUDED_DLLLOADER
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