# Registering classes in a module **URL:** \ **Category:** SDKs\ **Created:** [June 17, 2021, 6:05am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964 "2021-06-17T06:05:19Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Pierre\_Vareilles](https://forum.xojo.com/letter_avatar_proxy/v4/letter/p/3be4f8/32.png) [@Pierre\_Vareilles](https://forum.xojo.com/u/Pierre_Vareilles)\ **Post date:** [June 17, 2021, 6:05am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/1 "2021-06-17T06:05:19Z")
Is there somewhere an example on how to include classes in a module ? All my attempt fail. This is what I actually do based on code found. ```nohighlight REALclassDefinition Class1_Definition = { kCurrentREALControlVersion, "Class1", ...... ...... }; REALclassDefinition Class2_Definition = { kCurrentREALControlVersion, "Class2", ...... ...... }; static REALclassDefinition All_Classes[] = { Class1_Definition, Class2_Definition }; static REALclassDefinition* ac = All_Classes; static REALclassDefinition** All_ClassDef = ∾ // Structures and enumerations live inside of a module, // and so we will demonstrate how to declare them inside // of the module. static REALmoduleDefinition testModule = { kCurrentREALControlVersion, "TestStructEnumModule", testMethods, sizeof(testMethods) / sizeof(REALmethodDefinition), NULL, // Constants 0, // Constant count NULL, // Properties 0, // Property count testStructs, sizeof( testStructs ) / sizeof( REALstructure ), testEnums, sizeof( testEnums ) / sizeof( REALenum ), nil, // Atributes 0, // Attribute count nil, // Delegates 0, // Delegate count ClassDef, // Classes _countof(ClassDef), // Class count }; void PluginEntry( void ) { REALRegisterModule( &testModule ); // SetClassConsoleSafe(&Class1_Definition); // REALRegisterClass(&Class1_Definition); // SetClassConsoleSafe(&Class2_Definition); // REALRegisterClass(&Class2_Definition); } ``` Doing so auto-complete doesn’t show the classes after the first one. ```nohighlight Var c2 As TestStructEnumModule.Class2 ``` IDE complains that Class2 is an unknown type. Classes registered indepently work fine. One more question. From my knowledge it is not possible to declare structures in a class. Why ? Thanks in advance for your advices. ---
**Author:** ![Christian\_Schmitz](https://forum.xojo.com/user_avatar/forum.xojo.com/christian_schmitz/32/158_2.png) [@Christian\_Schmitz](https://forum.xojo.com/u/Christian_Schmitz)\ **Post date:** [June 17, 2021, 6:20am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/2 "2021-06-17T06:20:54Z")
``` ClassDef, // Classes _countof(ClassDef), // Class count ``` Are you sure this is right? Should it be: ``` All_Classes, // Classes _countof(All_Classes), // Class count = 2 ``` and I don’t see ClassDef above defined. ---
**Author:** ![Pierre\_Vareilles](https://forum.xojo.com/letter_avatar_proxy/v4/letter/p/3be4f8/32.png) [@Pierre\_Vareilles](https://forum.xojo.com/u/Pierre_Vareilles)\ **Post date:** [June 17, 2021, 8:08am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/3 "2021-06-17T08:08:26Z")
Christian, I meant All\_ClassDef instead ClassDef. I tried what you’re suggesting but I get : ```nohighlight ....... ....... 0, // Delegate count ALL_Classes, // Classes Cannot initialize a member subobject of type 'REALclassDefinition **' with an lvalue of type 'REALclassDefinition [2]' _countof(All_Classes), // Class count }; ``` ---
**Author:** ![Christian\_Schmitz](https://forum.xojo.com/user_avatar/forum.xojo.com/christian_schmitz/32/158_2.png) [@Christian\_Schmitz](https://forum.xojo.com/u/Christian_Schmitz)\ **Post date:** [June 17, 2021, 8:40am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/4 "2021-06-17T08:40:50Z")
```auto &All_Classes, // Classes _countof(All_Classes), // Class count = 2 ``` Add an & there? ---
**Author:** ![Pierre\_Vareilles](https://forum.xojo.com/letter_avatar_proxy/v4/letter/p/3be4f8/32.png) [@Pierre\_Vareilles](https://forum.xojo.com/u/Pierre_Vareilles)\ **Post date:** [June 17, 2021, 9:34am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/5 "2021-06-17T09:34:08Z")
Same kind of error. Just a bit different. ```nohighlight nil, // Delegates 0, // Delegate count &All_Classes, // Classes Cannot initialize a member subobject of type 'REALclassDefinition **' with an rvalue of type 'REALclassDefinition (*)[2]' _countof(All_Classes), // Class count }; ``` ---
**Author:** ![Christian\_Schmitz](https://forum.xojo.com/user_avatar/forum.xojo.com/christian_schmitz/32/158_2.png) [@Christian\_Schmitz](https://forum.xojo.com/u/Christian_Schmitz)\ **Post date:** [June 17, 2021, 9:36am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/6 "2021-06-17T09:36:47Z")
Your compiler is picky: `&All_Classes[0]` maybe like this with [0] on the end? ---
**Author:** ![Björn\_Eiríksson](https://forum.xojo.com/letter_avatar_proxy/v4/letter/b/da6949/32.png) [@Björn\_Eiríksson](https://forum.xojo.com/u/Bj%C3%B6rn_Eir%C3%ADksson)\ **Post date:** [June 17, 2021, 10:16am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/7 "2021-06-17T10:16:56Z")
Classes need to be set up like this: static REALclassDefinition\* MyClasses[] = { &MyClass1, &MyClass2, }; Thats basically his error that their set up wrong. ---
**Author:** ![Pierre\_Vareilles](https://forum.xojo.com/letter_avatar_proxy/v4/letter/p/3be4f8/32.png) [@Pierre\_Vareilles](https://forum.xojo.com/u/Pierre_Vareilles)\ **Post date:** [June 17, 2021, 10:22am UTC](https://forum.xojo.com/t/registering-classes-in-a-module/63964/8 "2021-06-17T10:22:17Z")
Björn, That did the trick !!! Thanks a lot both of you