Trying to communicate with WinAmp

Hello

I'm trying to connect with WinAmp (MP3 player) via the sendmessage function in User32.dll

So far, I can send commands like play, stop, forward, play the next etc. but sends a file to play name does not work.

It's the structure of the command:

#define IPC_ENQUEUEFILE 100
/ * This is sent as a WM_COPYDATA with IPC_PLAYFILE as the dwData member and the chain
* file / playlist to be queued in the lpData Member playlist editor.
* This will enqueue just the files, because you can use this to put a playlist.
* It not clears the current playlist or change the State of reading.
**
* COPYDATASTRUCT CD = {0};
* cds.dwData = IPC_ENQUEUEFILE;
* cds.lpData = (void*)"c:\\test\\folder\\test.mp3";
* cds.cbData = cds.lpData ((char*) lstrlen) + 1;  include a space for null char
* SendMessage (hwnd_winamp, WM_COPYDATA, 0, (LPARAM) &cds);)
**

0X4A = WM_COPYDATA

In VI, you can see what I've done. Before you run WinAmp VI must be already started. The 'windowfound' led should be on.

I have tried several things but no luck so far.

Can someone help me with this problem?

But you are clustering it! If do you a cluster and flatten out it, it would be
similar appearance.

COPYDATASTRUCT CD = {0};
cds.dwData = IPC_ENQUEUEFILE;
cds.lpData = (void*)"c:\\test\\folder\\test.mp3;
cds.cbData = cds.lpData ((char*) lstrlen) + 1;  include a space for null
char
SendMessage (hwnd_winamp, WM_COPYDATA, 0, (LPARAM) & cds);

The data member is a member of the lp, which indicates that it is a pointer to the
string, not the string itself. In addition, if look you in the header files
C, the exact definition is:

struct COPYDATASTRUCT {}
int dwData;
int cbData;
lpData, int;
}

Thus, the size of the string should precede the string, not after. Example c.
code is always correct, because they indicate the values of the elements, the order is
irrelevant.

Use DSNewPtr (Size) to get a pointer to a block of memory. Use MoveBlock(*src,)
* dest, size) to move your channel to this block (do * CBC an input string,)
and * the new pointer dest)... Don't forget to call DSDisposePtr(*p) to
free the memory when finished.

The prototypes are in the labview under cintools\extcode.h directory. In
the node libray call, you simply type "labview" as the name of the library.

Your 'cluster' should have three values U32 (or I32), dwData, cbData.
lpData. You can simply make a cluster with three parameters, and set
the dll to adapt to the type.

Kind regards

Wiebe.

Tags: NI Software

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