MaxSDK中卸载插件的方法

autodesk在Max2012SDK文档中否决了卸载插件这一行为，认为他不够安全，容易导致软件崩溃，确实，如果已经存在依赖关系，然后卸载了这个库，会导致问题。不过这里只是自娱自乐的探索：）。下面的代码是写了一个MaxScript的函数来实现卸载插件以及列出当前插件的文件名。

需要说明一下的是 14000 是定义在pluginapi.h中的一个宏 MAX_RELEASE_R14 的值，也就是Max2012版本的版本号。

def_visible_primitive(UnLoadPlugin, "UnLoadPlugin");

#if MAX_RELEASE < 14000
Value* UnLoadPlugin_cf(Value** arg_list, int count)
{
    check_arg_count("UnLoadPlugin", 1, count);
    TSTR  inputDllName(arg_list[0]->to_string());
    inputDllName.toUpper();
    DllDir * theDllDir;
    theDllDir = GetCOREInterface()->GetDllDirectory();

    Value * result = &false_value;

    for (int i = 0; i < theDllDir->Count(); ++i) 
    {
        DllDesc * dll_desc = &(*theDllDir)[i];
        if (dll_desc->loaded == true) 
        {
            TSTR currentDllName = dll_desc->fname;
            currentDllName.toUpper();
            if (currentDllName == inputDllName)
            {
                for (int i = 0; i < dll_desc->NumberOfClasses(); ++i) 
                {
                    ClassDesc *class_desc = (*dll_desc)[i];
                    GetCOREInterface()->DeleteClass(class_desc);
                }
                dll_desc->Free();
                dll_desc->loaded = false;
                result = &true_value;
            }
        }
    }
    return result;
}

#else

Value* UnLoadPlugin_cf(Value** arg_list, int count)
{
    check_arg_count("UnLoadPlugin", 1, count);
    TSTR  inputDllName(arg_list[0]->to_string());
    inputDllName.toUpper();
    DllDir * theDllDir;
    theDllDir = GetCOREInterface()->GetDllDirectory();

    Value * result = &false_value;

    for (int i = 0; i < theDllDir->Count(); ++i) 
    {
        const DllDesc * dll_desc(&(*theDllDir)[i]);
        if (dll_desc->IsLoaded() == true) 
        {
            TSTR currentDllName = dll_desc->GetFileName();
            currentDllName.toUpper();
            if (currentDllName == inputDllName && dll_desc->GetHandle() != 0)
            {
                for (int i = 0; i < dll_desc->NumberOfClasses(); ++i) 
                {
                    ClassDesc * class_desc = (*dll_desc)[i];
                    GetCOREInterface()->DeleteClass(class_desc);
                }
                result = &true_value;
                FreeLibrary(dll_desc->GetHandle());
            }
        }
    }
    
    return result;
}

#endif

def_visible_primitive(GetPluginList, "GetPluginList");
#if MAX_RELEASE < 14000
Value* GetPluginList_cf(Value** arg_list, int count)
{
    check_arg_count("GetPluginList",0, count);

    one_typed_value_local(Array* rArray);
    vl.rArray = new Array (0);

    DllDir * theDllDir;
    theDllDir = GetCOREInterface()->GetDllDirectory();

    for (int i = 0; i < theDllDir->Count(); ++i) 
    {
        DllDesc dll_desc = (*theDllDir)[i];
        if (dll_desc.loaded ) 
        {
            Value * tempName = new String(dll_desc.fname);
            vl.rArray->append(tempName); 
        }
    }
    return_value(vl.rArray); 
}
#else

Value* GetPluginList_cf(Value** arg_list, int count)
{
    check_arg_count("GetPluginList",0, count);

    one_typed_value_local(Array* rArray);
    vl.rArray = new Array (0);

    DllDir * theDllDir;
    theDllDir = GetCOREInterface()->GetDllDirectory();

    for (int i = 0; i < theDllDir->Count(); ++i) 
    {
        const DllDesc * dll_desc(&(*theDllDir)[i]);
        if (dll_desc->IsLoaded() == true) 
        {
            Value * tempName = new String(dll_desc->GetFileName());
            vl.rArray->append(tempName); 
        }
    }
    return_value(vl.rArray); 
}

#endif