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Introduction The Helium Music Manager Simple API or SA for short allows you to quickly communicate with Helium Music Manager from an external application. The API currently contains only basic features, but might be extended in the future. Suggestions are welcome. The API is built on windows messages as in Winamp’s API, in order that it should be as easy as possible to interact with the SA. The code examples in this document are written for Borland Delphi, but it should be simple enough to use the same code in VB and C/C++. All of the messages are sent in the form: Result := SendMessage(hwnd_helium, WM_HMM_IPC, (parameter), IPC_*); The parameter hwnd_helium can be retrieved with the following code: hwnd_helium := FindWindow(PChar(CLASS_NAME), nil); CLASS_NAME is equal to: Const CLASS_NAME = 'THeliumMainForm'; If Helium Music Manager is not started or the window cannot be found for some other reason then hwnd_helium will be equal to zero. WM_HMM_IPC is defined as: const WM_HMM_IPC = WM_USER; Not all messages return a result and not all messages require a parameter. This is described in detail below. Callbacks The messages IPC_GET_CURRENT_TRACK and IPC_GET_LIST_ITEM are a bit special and require more programming to handle than for the other messages. Both these messages will return data back to the calling application via a callback, therefore before calling these messages you must ensure that you have defined this callback in your application. The callback itself is defined by an IPC message, IPC_SET_CALLBACK_HWND. To define this callback, send the following IPC to Helium Music Manager: SendMessage(wnd, WM_USER, Self.Handle, IPC_SET_CALLBACK_HWND); Self.handle in this case is the window handle of your application, which Helium Music Manager will return data to. The data returned from IPC_GET_CURRENT_TRACK and IPC_GET_LIST_ITEM comes as a WM_COPYDATA message which you will need to handle. In short, you should handle them in your application as shown in the code below: Type TForm1 = class(TForm) Private … public procedure WMCOPYDATA(var Msg: TWMCopyData); message WM_COPYDATA; end; … procedure TForm1.WMCOPYDATA(var Msg: TWMCopyData); var sText: array[0..4096] of Char; begin case Msg.CopyDataStruct.dwData of IPC_GET_CURRENT_TRACK: begin StrLCopy(sText, Msg.CopyDataStruct.lpData, Msg.CopyDataStruct.cbData); // Do something with the resulting string here end; IPC_GET_LIST_ITEM: begin StrLCopy(sText, Msg.CopyDataStruct.lpData, Msg.CopyDataStruct.cbData); // Do something with the resulting string here end; end; end; Detailed list of all available IPC messages IPC_PLAY = 100; This message will start to play the active track in Helium Music Manager’s Active Playlist Parameters: None Result: None IPC_PLAYPAUSE = 101; This message will pause the playback (if playing), otherwise it will resume the playback (if paused) Parameters: None Result: None