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////////////////////////////////////////////////////////////////////////////////////////////////////
// Class: PDll //
// Authors: MicHael Galkovsky //
// Date: April 14, 1998 //
// Company: Pervasive Software //
// Purpose: Base class to wrap dynamic use of dll //
//////////////////////////////////////////////////////////////////////////////////////////////
#if !defined (_PDLL_H_)
#define _PDLL_H_
#include <windows.h>
#include <winbase.h>
#include <windows_error.h>
#include <tchar.h>
#include <sstream>
#define FUNC_LOADED 3456
//function declarations according to the number of parameters
//define the type
//declare a variable of that type
//declare a member function by the same name as the dll function
//check for dll handle
//if this is the first call to the function then try to load it
//if not then if the function was loaded successfully make a call to it
//otherwise return a nullptr cast to the return parameter.
#define DECLARE_FUNCTION0(CallType, retVal, FuncName) \
typedef retVal (CallType* TYPE_##FuncName)(); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName; \
retVal FuncName() \
{ \
if (m_dllHandle) \
{ \
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(); \
else \
return (retVal)nullptr; \
} \
else \
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION1(CallType,retVal, FuncName, Param1) \
typedef retVal (CallType* TYPE_##FuncName)(Param1); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName(Param1 p1) \
{ \
if (m_dllHandle) \
{ \
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1); \
else \
return (retVal)nullptr; \
} \
else \
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION2(CallType,retVal, FuncName, Param1, Param2) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2); \
else \
return (retVal)nullptr; \
} \
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION3(CallType,retVal, FuncName, Param1, Param2, Param3) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2, Param3 p3) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED; \
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3);\
else \
return (retVal)nullptr; \
} \
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION4(CallType,retVal, FuncName, Param1, Param2, Param3, Param4) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3, Param4); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4);\
else \
return (retVal)nullptr; \
} \
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION5(CallType,retVal, FuncName, Param1, Param2, Param3, Param4, Param5) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3, Param4, Param5); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName; \
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4, p5);\
else \
return (retVal)nullptr; \
} \
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION6(CallType,retVal, FuncName, Param1, Param2, Param3, Param4, Param5, Param6) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3, Param4, Param5, Param6); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4, p5, p6);\
else \
return (retVal)nullptr; \
} \
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION7(CallType,retVal, FuncName, Param1, Param2, Param3, Param4, Param5, Param6, Param7) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3, Param4, Param5, Param6, Param7); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4, p5, p6, p7);\
else \
return (retVal)nullptr; \
} \
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION8(CallType,retVal, FuncName, Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4, p5, p6, p7, p8);\
else \
return (retVal)nullptr; \
}\
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION9(CallType,retVal, FuncName, Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, Param9) \
typedef retVal (CallType* TYPE_##FuncName)(Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, Param9); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName; \
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8, Param9 p9) \
{\
if (m_dllHandle)\
{\
if (FUNC_NAME != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4, p5, p6, p7, p8, p9);\
else \
return (retVal)nullptr; \
}\
else\
return (retVal)nullptr; \
}
#define DECLARE_FUNCTION10(CallType,retVal, FuncName, Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, Param9, Param10) \
typedef retVal (CallType* TYPE_##FuncName)FuncName(Param1, Param2, Param3, Param4, Param5, Param6, Param7, Param8, Param9, Param10); \
TYPE_##FuncName m_##FuncName; \
short m_is##FuncName;\
retVal FuncName (Param1 p1, Param2 p2, Param3 p3, Param4 p4, Param5 p5, Param6 p6, Param7 p7, Param8 p8, Param9 p9, Param10 p10) \
{\
if (m_dllHandle)\
{\
if (FUNC_LOADED != m_is##FuncName) \
{\
m_##FuncName = nullptr; \
m_##FuncName = (TYPE_##FuncName)GetProcAddress(m_dllHandle, #FuncName); \
m_is##FuncName = FUNC_LOADED;\
}\
if (nullptr != m_##FuncName) \
return m_##FuncName(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10);\
else \
return (retVal)nullptr; \
}\
else \
return (retVal)nullptr;\
}
//declare constructors and LoadFunctions
#define DECLARE_CLASS(ClassName) \
public: \
ClassName (LPCTSTR name){LoadDll(name);} \
ClassName () {PDLL();}
class PDLL
{
protected:
HINSTANCE m_dllHandle;
private:
LPTSTR m_dllName;
int m_refCount;
public:
PDLL()
{
m_dllHandle = nullptr;
m_dllName = nullptr;
m_refCount = 0;
}
//A nullptr here means the name has already been set
void LoadDll(LPCTSTR name, bool showMsg = true)
{
if (name)
SetDllName(name);
//try to load
m_dllHandle = LoadLibrary(m_dllName);
if (m_dllHandle == nullptr && showMsg)
{
std::ostringstream message;
message << "failed to load dll: " << ::GetLastError();
throw std::runtime_error(message.str().c_str());
}
}
bool SetDllName(LPCTSTR newName)
{
bool retVal = false;
//we allow name resets only if the current DLL handle is invalid
//once they've hooked into a DLL, the name cannot be changed
if (!m_dllHandle)
{
if (m_dllName)
{
delete []m_dllName;
m_dllName = nullptr;
}
//They may be setting this null (e.g., uninitialize)
if (newName)
{
m_dllName = new TCHAR[_tcslen(newName) + 1];
_tcscpy(m_dllName, newName);
}
retVal = true;
}
return retVal;
}
virtual bool Initialize(short showMsg = 1)
{
bool retVal = false;
//Add one to our internal reference counter
m_refCount++;
if (m_refCount == 1 && m_dllName) //if this is first time, load the DLL
{
//we are assuming the name is already set
LoadDll(nullptr, showMsg);
retVal = (m_dllHandle != nullptr);
}
return retVal;
}
virtual void Uninitialize(void)
{
//If we're already completely unintialized, early exit
if (!m_refCount)
return;
//if this is the last time this instance has been unitialized,
//then do a full uninitialization
m_refCount--;
if (m_refCount < 1)
{
if (m_dllHandle)
{
FreeLibrary(m_dllHandle);
m_dllHandle = nullptr;
}
SetDllName(nullptr); //clear out the name & free memory
}
}
virtual ~PDLL()
{
//force this to be a true uninitialize
m_refCount = 1;
Uninitialize();
//free name
if (m_dllName)
{
delete [] m_dllName;
m_dllName = nullptr;
}
}
};
#endif
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