文章目录
1.导出表2.界面检测3.作者答疑本文是系列文章中的一节,有需要的读者,如果阅读时遇到突然出现的符号和术语,可以去前面的章节查找。
1.导出表
illustrate插件本质上是动态链接库,除了有导入表,自然有供宿主软件调用的导出表。这里采用ida打开,转到导出表即可看到。如下图所示:
可以看出,有3个导出函数,一个是PluginMain,插件入口函数,DllEntryPoint 进入点函数。从illustrator SDK中,我们找到了入口点函数PluginMain的调用形式,如下所示:
extern "C" ASAPI ASErr PluginMain(char* caller, char* selector, void* message){ASErr error = kNoErr;SPMessageData *msgData = (SPMessageData *)message;Plugin *plugin = (Plugin *)msgData->globals;sSPBasic = msgData->basic;if (strcmp(caller, kSPInterfaceCaller) == 0) {if (strcmp( selector, kSPInterfaceStartupSelector) == 0){plugin = AllocatePlugin(msgData->self);if (plugin){msgData->globals = (void *)plugin;error = plugin->StartupPlugin((SPInterfaceMessage *)message);if (error != kNoErr){// Make sure to delete in case startup faileddelete plugin;plugin = nil;msgData->globals = nil;}}else{error = kOutOfMemoryErr;}}else if (strcmp(selector, kSPInterfaceShutdownSelector) == 0){if (plugin){error = plugin->ShutdownPlugin((SPInterfaceMessage *)message);delete plugin;plugin = nil;msgData->globals = nil;}}}if (plugin){if (Plugin::IsReloadMsg(caller, selector)){// Call this before calling any virtual functions (like Message)FixupReload(plugin);error = plugin->ReloadPlugin((SPInterfaceMessage *)message);}else{// If a load or reload failed because the suites could not be acquired, we released// any partially acquired suites and returned an error. However, SuitePea still might// call us, so protect against this situation.if (plugin->SuitesAcquired())error = plugin->Message(caller, selector, message);elseerror = kNoErr;}if (error == kUnhandledMsgErr){error = kNoErr;#ifndef NDEBUG#ifdef MAC_ENVfprintf(stderr, "Warning: Unhandled plugin message: caller \"%s\" selector \"%s\"\n", caller, selector);#elsechar buf[1024];sprintf(buf+1, "Warning: Unhandled plugin message: caller \"%s\" selector \"%s\"\n", caller, selector);OutputDebugStringA(buf+1);#endif#endif}}if (error){if (plugin)plugin->ReportError(error, caller, selector, message);elsePlugin::DefaultError(msgData->self, error);}return error;}
这个函数由3个参数组成,一个caller调用者名称,一个是selector选择字符串,最后一个是该消息携带的信息。它是与宿主软件调用插件的接口。
2.界面检测
界面有原生窗口界面和DirectUI绘制界面,采用spy++这个工具软件测试一下,如下图所示:
选择箭头所指图标,然后在CAD界面(左侧)上移动,右边会出现相应的参考信息。说明是采用windows原生窗口句柄绘制。
接下来分析CADTools具体功能的实现。
3.作者答疑
如有疑问,请留言。
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