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Adding Parameters to Windows' Callbacks

Started by Donuts Feb 1, 2003 at 5:35 AM 0 replies 150+ views
Original Post
Donuts
Donuts
I need to know if I can add a parameter to an existing windows callback. I have to use the MidiCallback and I need the callback to be able to access members of the class calling it(I hope that makes sense). Anyway it would make life much easier if I could pass an Lparam through it like what is done in DialogBoxParam. If anyone knows what I talking about and can offer some help/suggestion, it would be greatly appreciated.
cnstrnd
cnstrnd 

    
MMRESULT midiStreamOpen(
  LPHMIDISTRM lphStream,  
  LPUINT      puDeviceID, 
  DWORD       cMidi,      
  DWORD_PTR   dwCallback, 
  DWORD_PTR   dwInstance, // <- ... made for you

  DWORD       fdwOpen      
);


I used this one to access my waveOut class

[edited by - cnstrnd on February 1, 2003 6:47:33 AM]

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