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    <p>@Dave Gamble nailed it, but I wanted to add a few things on VST shell plugins, since they are a bit tricky to work with.</p> <p>To determine if a VST is a shell plugin, send the <code>effGetPlugCategory</code> opcode to the plugin dispatcher. If it returns <code>kPlugCategShell</code>, then it's a shell plugin. To get the list of sub-plugins in the shell, you basically call <code>effShellGetNextPlugin</code> until it returns 0. Example code snippit (adapted from a <a href="http://github.com/teragonaudio/MrsWatson/" rel="nofollow">working VST host</a>):</p> <pre><code>// All this stuff should probably be set up far earlier in your code... // This assumes that you have already opened the plugin and called VSTPluginMain() typedef VstIntPtr (*Vst2xPluginDispatcherFunc)(AEffect *effect, VstInt32 opCode, VstInt32 index, VstIntPtr value, void *ptr, float opt); Vst2xPluginDispatcherFunc dispatcher; AEffect* plugin; char nameBuffer[40]; while(true) { memset(nameBuffer, 0, 40); VstInt32 shellPluginId = dispatcher(pluginHandle, effShellGetNextPlugin, 0, 0, nameBuffer, 0.0f); if(shellPluginId == 0 || nameBuffer[0] == '\0') { break; } else { // Do something with the name and ID } } </code></pre> <p>If you actually want to load a plugin in a VST shell, it's a bit trickier. First, your host needs to handle the <code>audioMasterCurrentId</code> opcode in the host callback. When you call the VST's <code>VSTPluginMain()</code> method to instantiate the plugin, it will call the host callback with this opcode and ask for the unique ID which should be loaded.</p> <p>Because this callback is made <em>before</em> the main function returns (and hence, before it delivers an <code>AEffect*</code> to your host), that means that you probably will need to store the shell plugin ID to load in a global variable, since you will not be able to save a pointer to any meaningful data in <code>void* user</code> field of the <code>AEffect</code> struct in time for it to be passed back to you in the host callback.</p>
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    1. POHow do I scan/enumerate vst plugin dlls?
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    1. USNik Reiman
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