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Trumml · 9th June 2002, 11:30

Dear guys,
i'm currently developing a delphi-application to control two winamp instances. First i open two winamp instances and save the handles of those two.
Now it's no problem to control the winamps with the handle and the SendMassage() method but i can't load a song into winamp!

!!! The C code is !!!
__________________________________________________________________
#define IPC_PLAYFILE 100
COPYDATASTRUCT cds;
cds.dwData = IPC_PLAYFILE;
cds.lpData = (void *) "file.mp3";
cds.cbData = strlen((char *) cds.lpData)+1; // include space for null char
SendMessage(hwnd_winamp,WM_COPYDATA,(WPARAM)NULL,(LPARAM)&cds);
__________________________________________________________________

!!! but the following delphi code doesn't work !!!
__________________________________________________________________
cds: TCopyDataStruct;
cds.dwData := 100;
cds.cbData := Length(FileName)+1;
cds.lpData := StrAlloc(cds.cbData);
SendMessage(winamp_handle, WM_COPYDATA, WPARAM(winamp_handle),LPARAM(@cds));
__________________________________________________________________

what's wrong with that delphi code snippet?

greetings,
martin from austria.
[and NO, in Austria we do not have kangaroos (-;]

Gourou · 9th June 2002, 14:27

maybe you have the same prob as I did and have to use the CopyDataSendMessage API instead of just plain SendMessage, other than that, I dont see a problem, I dont know delphi too well, but are you passing the pointer of the string to the filename and not just the string itself? that's the only other problem I had.

Trumml · 9th June 2002, 19:42

I think my code is correct now, but it still doesn't work. Is it possible, that this method only works within a Winamp plugin?

__________________________________________________________
cds.dwData := 100;
cds.lpData := pchar(FileName);
cds.cbData := length(FileName)+1;
SendMessage (winamp_handle,WM_COPYDATA,longint(Handle),longint(@cds));
__________________________________________________________

Gourou · 9th June 2002, 20:54

no, because the vb code works external, you need some delphi programmer style help, good luck on this

shrom · 14th June 2002, 16:23

Try this, it works for me:

cds.dwData := 100;
cds.lpData := PChar(MusicFile);
cds.cbData := strlen(cds.lpData) + 1;
SendMessage(Handle, WM_COPYDATA, 0, LongInt(@cds));

9th June 2002, 11:30	#1
Trumml Junior Member Join Date: Jun 2002 Posts: 2	Load title Dear guys, i'm currently developing a delphi-application to control two winamp instances. First i open two winamp instances and save the handles of those two. Now it's no problem to control the winamps with the handle and the SendMassage() method but i can't load a song into winamp! !!! The C code is !!! __________________________________________________________________ #define IPC_PLAYFILE 100 COPYDATASTRUCT cds; cds.dwData = IPC_PLAYFILE; cds.lpData = (void ) "file.mp3"; cds.cbData = strlen((char ) cds.lpData)+1; // include space for null char SendMessage(hwnd_winamp,WM_COPYDATA,(WPARAM)NULL,(LPARAM)&cds); __________________________________________________________________ !!! but the following delphi code doesn't work !!! __________________________________________________________________ cds: TCopyDataStruct; cds.dwData := 100; cds.cbData := Length(FileName)+1; cds.lpData := StrAlloc(cds.cbData); SendMessage(winamp_handle, WM_COPYDATA, WPARAM(winamp_handle),LPARAM(@cds)); __________________________________________________________________ what's wrong with that delphi code snippet? greetings, martin from austria. [and NO, in Austria we do not have kangaroos (-;] Last edited by Trumml; 9th June 2002 at 11:53.

9th June 2002, 19:42	#3
Trumml Junior Member Join Date: Jun 2002 Posts: 2	... I think my code is correct now, but it still doesn't work. Is it possible, that this method only works within a Winamp plugin? __________________________________________________________ cds.dwData := 100; cds.lpData := pchar(FileName); cds.cbData := length(FileName)+1; SendMessage (winamp_handle,WM_COPYDATA,longint(Handle),longint(@cds)); __________________________________________________________

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9th June 2002, 14:27	#2
Gourou Senior Member Join Date: Feb 2002 Location: The backside of the universe on the trailing edge of eternity Posts: 238	maybe you have the same prob as I did and have to use the CopyDataSendMessage API instead of just plain SendMessage, other than that, I dont see a problem, I dont know delphi too well, but are you passing the pointer of the string to the filename and not just the string itself? that's the only other problem I had.

9th June 2002, 20:54	#4
Gourou Senior Member Join Date: Feb 2002 Location: The backside of the universe on the trailing edge of eternity Posts: 238	no, because the vb code works external, you need some delphi programmer style help, good luck on this

14th June 2002, 16:23	#5
shrom Junior Member Join Date: Jun 2002 Posts: 6	Try this, it works for me: cds.dwData := 100; cds.lpData := PChar(MusicFile); cds.cbData := strlen(cds.lpData) + 1; SendMessage(Handle, WM_COPYDATA, 0, LongInt(@cds));