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Old 04-14-2018, 08:39
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just for the fun of it, a c++14 version

PHP Code:
#include <string>
#include <memory>
#include <map>
#include <system_error>

template <typename Ftypename... ArgTypes>
auto DynCallT(LPCTSTR libNameLPCSTR funcNameArgTypes... args)
{
    
using tstring std::basic_string<TCHARstd::char_traits<TCHAR>, std::allocator<TCHAR>>;
    
using lib_ptr std::shared_ptr<std::remove_pointer_t<const HMODULE>>;
    
using lib_map std::map<const tstringlib_ptr>;

    static 
lib_map libMap;

    
HMODULE h nullptr;
    const 
auto &libMap.find(libName);
    if(
!= libMap.end())
        
l->second.get();
    else if((
= ::LoadLibrary(libName)) != nullptr)
        
libMap[libName] = lib_ptr(h, ::FreeLibrary);
    else
        throw 
std::system_error(std::make_error_code(std::errc::invalid_argument));

    
F f reinterpret_cast<F>(::GetProcAddress(hfuncName));
    if(!
f)
        throw 
std::system_error(std::make_error_code(std::errc::function_not_supported));

    return 
f(args...);

usage:
PHP Code:
    // using 'decltype' when you have a prototype 
    
auto r DynCallT<decltype(&MessageBoxA)>(_T("user32"), "MessageBoxA"nullptr"123""321"0);

    
// or using func decl as template arg
    
auto tc1 DynCallT<DWORD(WINAPI*)()>(_T("kernel32"), "GetTickCount");

    
// using "i dont give a shit" decl :)
    
auto tc2 DynCallT<void*(WINAPI*)(...)>(_T("kernel32"), "GetTickCount"1"asd");

    
void WINAPI blub(DWORD);
    
DynCallT<decltype(&blub)>(_T("kernel32"), "Sleep"0); 
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The Following 2 Users Say Thank You to bugficks For This Useful Post:
niculaita (04-14-2018), tonyweb (05-09-2018)