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Many people use Winamp as their main mp3 player, and some have switched from Winamp 2.xx to Winamp 3.xx. Since Winamp 2.xx used the simple
WM_COPYDATA to control play, pause, stop etc, many other programs could control Winamp too.
In the 3.xx version of Winamp, the windows-messages was removed from the player, as we know it. Messagemod is a plugin (WAC) that adds the old functionality. I usually program in MFC, so this library is primarily made with MFC.
Messagemod is not complete with ALL the functions, but it has the basics. If you don't want to learn how to code it yourself, just download the "Winamp 2x Plugin Manager" from Winamp's homepage, that will give you all the functionality that the old 2.xx has.
What is needed
Download the Wasabi SDK from http://www.winamp.com/nsdn/
When you have installed (unpacked) it to somewhere (Default:
C:\Wasabi SDK) please read the few text files under the
\docs directory to get some info about the SDK before starting. (I'll guess that you won't find it useful now, but maybe later)
Now compile the projects:
- \Studio - This is the BFC project (project file is not in the bfc directory). Output: bfc.lib
- \Studio\waclient - Output: waclient.lib
Unpack the sourcecode in the directory: \Studio\Examples\MessageMod
Add waclient.lib and bfc.lib to the project.
Before you try to compile the, please check the paths in settings for debug and working folder. Also check the "Post-build step" and change it to your new paths.
We use Winamp 3.x (studio.exe) as the debug component. (So we can get all the TRACE messages)
What is a WAC?
A WAC is just a renamed DLL file. I guess Nullsoft guys wanted to see the difference between a component and system dll's. :)
Using the code
MessageMod.cpp and MessageMod.h:
In these files we have 2 classes;
WACNAME. I have let the
WACNAME remain unchanged as they are in the examples. Just because it would be easy to compare with other examples. Thanks for the easy template Nullsoft.
CMessageModApp class takes care of the MFC bit of the project. The output is a shared DLL MFC dll compilation.
WACNAME takes care of the Winamp 3.xx bit of the project. I've added some useful overrides like "
runlevelcb_onShutdown", but it is kept as simple as possible.
Winamp 3.xx makes a window called "STUDIO". The old Winamp 2.xx made a window called "Winamp 1.x". To handle that I've made a dummy window that is named the same. The window created is global, and the handling of the WM-commands are also global.
It is the dummy window that does all the magic, look at the easy
LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam,
FillRect(GetDC(hwnd), &r, (HBRUSH) GetStockObject(GRAY_BRUSH));
int res=HandleWMCommand(hwnd, wParam,lParam);
int res=HandleWMUser(hwnd, wParam,lParam);
return DefWindowProc(hwnd, uMsg, wParam, lParam);
HandleWMUser handles the different messages. This article will not explain how to use the the Wasabi SDK. It will just show you how it is done. It takes some time to be able to handle the Wasabi. To learn it you'll have to work some hours. It is clever to use Winamps forums also.
When you have compiled the code and Winamp3 is started you must make a simple program to send
WM_USER messages to the dummy window.
HWND Winamp=::FindWindow("Winamp 1.x",NULL);
::SendMessage(Winamp, WM_COMMAND, WINAMP_PLAY, NULL);
Now with this code above you should be able to press play from an other program. The WinampDefs.h is a complete list over commands. The comments here gives an overview of what is added or not.
Many of the functions that is depending to be in the same process as Winamp. All of these functions has been removed, since pointers are not available through processes.
If messages are sent before the STUDIO window is created it will crash. Winamp 3.x loads the plug-ins before the main window.
Due lack of time many of the features are not implemented, but can easily been done. So if someone feels like finishing it, please do so. Mail me if you want to publish it here as updated code, with your credits of course! :)