VFP, VFP , mmsystem.dll and low level midi

VFP , mmsystem.dll and low level midi

Author	Message
Justm #1 / 5	VFP , mmsystem.dll and low level midi Can anyone see what I'm doing wrong here? set libr to foxtools.fll outhandle=0 results returns 0 so no error. outhandle remains at 0 (no handle passed) just to make sure, call another function sendshortmsg=regfn("midiOutShortMsg",'LL','I','mmsystem.dll') results=callfn(sendshortmsg,outhandle,0) *results return 5 invalid handle error For some reason I'm not getting a handle returned to the "outhandle" reference. If anyone can help, please do. (This is being run on ver 5 of VFP) Thanks in advance Tim Kolesa
Sat, 09 Aug 2003 20:39:27 GMT

Rick Bea #2 / 5	VFP , mmsystem.dll and low level midi Tim, The midiOutOpen function's 3rd parameter requires a callback address. Since VFP doesn't support this, you'll need to try a different approach. e.g. Write the code in a VB .DLL tand then call it in VFP. Rick Quote: > Can anyone see what I'm doing wrong here? > set libr to foxtools.fll > outhandle=0 > results returns 0 so no error. outhandle remains at 0 (no handle > passed) > just to make sure, call another function > sendshortmsg=regfn("midiOutShortMsg",'LL','I','mmsystem.dll') > results=callfn(sendshortmsg,outhandle,0) > *results return 5 invalid handle error > For some reason I'm not getting a handle returned to the "outhandle" > reference. > If anyone can help, please do. (This is being run on ver 5 of VFP) > Thanks in advance > Tim Kolesa
Sat, 09 Aug 2003 22:59:05 GMT

Ook #3 / 5	VFP , mmsystem.dll and low level midi FWIW, in many cases 0 is a valid handle. Are you sure it isn't working? Quote: > Can anyone see what I'm doing wrong here? > set libr to foxtools.fll > outhandle=0 > results returns 0 so no error. outhandle remains at 0 (no handle > passed) > just to make sure, call another function > sendshortmsg=regfn("midiOutShortMsg",'LL','I','mmsystem.dll') > results=callfn(sendshortmsg,outhandle,0) > *results return 5 invalid handle error > For some reason I'm not getting a handle returned to the "outhandle" > reference. > If anyone can help, please do. (This is being run on ver 5 of VFP) > Thanks in advance > Tim Kolesa
Sat, 09 Aug 2003 23:57:13 GMT

Justm #4 / 5	VFP , mmsystem.dll and low level midi Thanks, There must be some inaccuracies with the documentation I have. It says that the callback can be disabled by passing a null value at that parameter, but interestingly the midiInOpen function which uses the same set of params says nothing about disabling callback. Guess I'l have to try a different approach. Tim Quote: > Tim, > The midiOutOpen function's 3rd parameter requires a callback address. Since > VFP doesn't support this, you'll need to try a different approach. e.g. > Write the code in a VB .DLL tand then call it in VFP. > Rick
Tue, 12 Aug 2003 20:37:25 GMT

Rick Bea #5 / 5	VFP , mmsystem.dll and low level midi Tim, Digging deeper, I believe you are right about the callback for this function being optional. If you are using VFP 5.0, you might want to use the DECLARE DLL functionallity - or at least try using RegFn32() and use the 32-bit .DLL. outhandle=0 OR outhandle=0 Rick Quote: > Thanks, > There must be some inaccuracies with the documentation I have. It says that > the callback can be disabled by passing a null value at that parameter, but > interestingly the midiInOpen function which uses the same set of params says > nothing about disabling callback. Guess I'l have to try a different > approach. > Tim > > Tim, > > The midiOutOpen function's 3rd parameter requires a callback address. > Since > > VFP doesn't support this, you'll need to try a different approach. e.g. > > Write the code in a VB .DLL tand then call it in VFP. > > Rick
Tue, 12 Aug 2003 22:07:18 GMT

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