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Introduction
Schema calls describe the signature used for a schema function call. The schema framework uses this to validate the arguments when the call is made in schema script and also to show the correct signature in the symbol picker in the user interface.
Creating and using
Register the call with SchemaClassRegisterCall
Add parameters to the call with SchemaCallRegisterParam
Set the call as the signature for a schema member when you register the member with SchemaClassRegisterMember
Example
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void RegisterSchema()
{
HINSTANCE instance = AfxGetResourceHandle();
SchemaHandle client = SchemaOpenRegistry(L"MySchemaClientName");
// Type is undefined and handler is null because we never instantiate this class
SchemaHandle schemaClass = SchemaRegisterClass(client, LocString(L"MyClassName", instance, IDS_CLASS_NAME, IDS_CLASS_DESCRIPTION), SystemType::Undefined, NULL);
SchemaHandle fileExistsParams = SchemaClassRegisterCall(client, manager, L"FileExistsParams");
SchemaCallRegisterParam(fileExistsParams, LocString(L"ParamIdName", instance, IDS_PARAM_FRIENDLY_NAME, IDS_PARAM_DESCRIPTION), SystemType::AString, false);
// Register a class member that has a signature that is the previously registered "FileExistsParams" call.
SchemaHandle fileExists = SchemaClassRegisterMember(client, manager, LocString(L"FileExists", instance, IDS_FUNC_NAME, IDS_FUNC_DESCRIPTION), eSchemaReadOnly, SystemType::Boolean, eSchemaVarDispCall, FileExistsFunc, -1, L"FileExistsParams");
}
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