{"id":165284,"date":"2020-10-03T06:59:04","date_gmt":"2020-10-02T22:59:04","guid":{"rendered":"http:\/\/4563.org\/?p=165284"},"modified":"2020-10-03T06:59:04","modified_gmt":"2020-10-02T22:59:04","slug":"%e7%bf%bb%e8%af%91-qt-%e9%80%9a%e8%bf%87-qmetatype-%e8%8e%b7%e5%8f%96%e7%b1%bb%e5%9e%8b%e4%bf%a1%e6%81%af","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=165284","title":{"rendered":"[\u7ffb\u8bd1] [Qt] \u901a\u8fc7 QMetaType \u83b7\u53d6\u7c7b\u578b\u4fe1\u606f"},"content":{"rendered":"
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[\u7ffb\u8bd1] [Qt] \u901a\u8fc7 QMetaType \u83b7\u53d6\u7c7b\u578b\u4fe1\u606f <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : wzzzx <\/span> <\/i> 6<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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\u6765\u6e90\uff1a https:\/\/woboq.com\/blog\/qmetatype-knows-your-types.html<\/p>\n

QMetaType<\/code>\u662fQt<\/code>\u7528\u6765\u83b7\u53d6\u7c7b\u578b\u52a8\u6001\u8fd0\u884c\u4fe1\u606f\u7684\u5de5\u5177\u3002\u901a\u8fc7\u5b83\u80fd\u591f\u4f7f\u8bf8\u5982QVariant<\/code>\u7684\u7c7b\u80fd\u591f\u5c01\u88c5\u81ea\u5b9a\u4e49\u7c7b\u578b\uff0c\u590d\u5236\u4fe1\u53f7\u961f\u5217\u4e2d\u7684\u53c2\u6570\u7b49\u4e8b\u60c5\u3002 \u5982\u679c\u4f60\u60f3\u77e5\u9053Q_DECLARE_META_TYPE<\/code>\u548cqRegisterMetaType<\/code>\u662f\u505a\u4ec0\u4e48\u7684\uff0c\u8be5\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\uff0c\u53ef\u4ee5\u8bfb\u4e00\u4e0b\u3002\u8fd9\u7bc7\u6587\u7ae0\u4f1a\u544a\u77e5\u5173\u4e8eQMetaType<\/code>\u7684\u76f8\u5173\u4fe1\u606f\uff1a\u4e3a\u4ec0\u4e48\u9700\u8981\u8fd9\u4e48\u4e00\u4e2a\u7c7b\uff0c\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u5b83\uff0c\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\u3002<\/p>\n

\u4e3a\u4ec0\u4e48 Qt \u9700\u8981\u8fd0\u884c\u65f6\u52a8\u6001\u7c7b\u578b\u4fe1\u606f<\/h2>\n

\u9996\u5148\u9700\u8981\u56de\u987e\u4e00\u4e0bQt<\/code>\u7684\u5386\u53f2\u3002QMetaType<\/code>\u5728Qt4.0<\/code>\u88ab\u5f15\u5165\u3002\u521b\u5efa\u8fd9\u6837\u4e00\u4e2a\u7c7b\u662f\u4e3a\u4e86\u89e3\u51b3\u5f02\u6b65\u7684\u4fe1\u53f7\u673a\u5236(Qt::QueuedConnection)<\/code>\u3002\u4e3a\u4e86\u4f7f\u961f\u5217\u4e2d\u7b49\u5f85\u8c03\u7528\u7684\u69fd\u51fd\u6570\u80fd\u591f\u6b63\u5e38\u5de5\u4f5c\uff0c\u4fe1\u53f7\u4e2d\u53c2\u6570\u4f1a\u88ab\u590d\u5236\u548c\u5b58\u50a8\u8d77\u6765\uff0c\u4ee5\u4fbf\u4e8b\u4ef6\u5faa\u73af\u51fd\u6570\u80fd\u591f\u6b63\u786e\u8c03\u7528\u3002 \u4e3a\u4e86\u80fd\u591f\u6b63\u5e38\u8c03\u7528\u961f\u5217\u4e2d\u7684\u69fd\u51fd\u6570\uff0c\u4fe1\u53f7\u4e2d\u7684\u53c2\u6570\u4f1a\u88ab\u590d\u5236\uff0c\u5b58\u50a8\u5728\u7a0d\u540e\u5904\u7406\u7684\u4e8b\u4ef6\u4e2d\u3002\u540c\u65f6\uff0c\u5f53\u5b8c\u6210\u69fd\u51fd\u6570\u7684\u8c03\u7528\u540e\uff0c\u8fd8\u9700\u8981\u5220\u9664\u8fd9\u4e9b\u526f\u672c\u3002\u4f46\u662f\u4f7f\u7528Qt::DirectConnection<\/code>\u53c2\u6570\u7684\u8fde\u63a5\u5c31\u4e0d\u9700\u8981\u4e86\uff0c\u69fd\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u6808\u4e0a\u7684\u53c2\u6570\u3002 \u5728QMetaObject::activate<\/code>\u4e2d\u7528\u4e8e\u5206\u53d1\u4fe1\u53f7\u7684\u4ee3\u7801\u6709\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\u6307\u5411\u4fe1\u53f7\u53c2\u6570\u3002\u4f46\u662fQt<\/code>\u77e5\u9053\u7684\u53c2\u6570\u7c7b\u578b\u90fd\u662fmoc<\/code>\u6240\u5bfc\u51fa\u7684\u540d\u79f0\u5b57\u7b26\u4e32\u3002 QMetaType<\/code>\u63d0\u4f9b\u4e86\u4e00\u79cd\u65b9\u5f0f\u80fd\u591f\u76f4\u63a5\u4ece\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\"QPoint\"<\/code>\uff0c\u53bb\u83b7\u53d6\u526f\u672c\u548c\u9500\u6bc1\u5bf9\u8c61\u7684\u65b9\u6cd5\u3002Qt<\/code>\u80fd\u591f\u4f7f\u7528void *QMetaType::create(int type, void *copy)<\/code>\u548cQMetaType::destroy(int type, void *data)<\/code>\u6765\u62f7\u8d1d\u548c\u9500\u6bc1\u53c2\u6570\u3002\u5bf9\u4e8eint<\/code>\u7c7b\u578b\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528QMetaType::type(const char *typeName)<\/code>\u6765\u83b7\u53d6\uff0c\u8fd9\u4e9b\u90fd\u662fmoc<\/code>\u6240\u63d0\u4f9b\u7684\u80fd\u529b\u3002QMetaType<\/code>\u8fd8\u63d0\u4f9b\u4e86\u65b9\u6cd5\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u6ce8\u518c\u4efb\u610f\u7c7b\u578b\u5230\u5143\u5bf9\u8c61\u6570\u636e\u5e93\u4e2d\u3002 \u53e6\u4e00\u4e2a\u4f8b\u5b50\u662fQVariant<\/code>\u3002\u5728Qt3.x<\/code>\u7248\u672c\u4e2d\u7684QVariant<\/code>\u4ec5\u652f\u6301\u5185\u7f6e\u7c7b\u578b\uff0c\u56e0\u4e3aQVariant<\/code>\u6240\u5305\u542b\u7684\u7c7b\u578b\u9700\u8981\u8ddfQVariant<\/code>\u4e00\u8d77\u88ab\u62f7\u8d1d\u548c\u9500\u6bc1\u3002\u4f46\u662f\u6709QMetaType<\/code>\u540e\uff0cQVariant<\/code>\u80fd\u591f\u5c01\u88c5\u4efb\u610f\u5df2\u6ce8\u518c\u7684\u7c7b\u578b\uff0c\u56e0\u4e3aQVariant<\/code>\u80fd\u591f\u8ddf\u62f7\u8d1d\u548c\u9500\u6bc1\u8fd9\u4e9b\u5bf9\u8c61\u5b9e\u4f8b\u3002<\/p>\n

QMetaType \u6301\u6709\u4ec0\u4e48\u4fe1\u606f<\/h2>\n

Qt4.0<\/code>\u4e4b\u540e\u5f88\u591a\u4e1c\u897f\u53d1\u751f\u4e86\u6539\u53d8\u3002QtScript<\/code>\u548cQML<\/code>\u52a0\u5f3a\u4e86\u5bf9\u52a8\u6001\u7c7b\u578b\u96c6\u6210\u7684\u4f7f\u7528\uff0c\u6240\u4ee5\u9700\u8981\u989d\u5916\u7684\u8fdb\u884c\u5f88\u591a\u4f18\u5316\u3002 \u4e0b\u9762\u662f\u6bcf\u4e2a\u7c7b\u578b\u5728\u5143\u5bf9\u8c61\u7cfb\u7edf<\/strong>\u4e2d\u4f1a\u6301\u6709\u7684\u4fe1\u606f\uff1a<\/p>\n

    \n
  • \u7c7b\u578b\u540d<\/strong> \u7c7b\u578b\u540d\u9700\u8981\u88ab\u6ce8\u518c\u3002\u5e76\u4e14\u6709\u4e00\u4e2a\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u5143\u7c7b\u578b id \u7684\u540d\u79f0\u7d22\u5f15\u3002\u5728Qt4.7<\/code>\u4e4b\u540e\uff0c\u80fd\u591f\u88ab\u76f8\u540c\u7684\u7c7b\u578b\u6ce8\u518c\u4e0d\u540c\u7684\u540d\u5b57\uff0c\u8fd9\u4e2a\u7279\u6027\u5bf9\u4e8etypedef<\/code>\u975e\u5e38\u6709\u7528\u3002<\/li>\n
  • \u62f7\u8d1d\u6784\u9020\u51fd\u6570<\/strong>\uff0c\u6790\u6784\u51fd\u6570<\/strong><\/li>\n
  • \u5927\u5c0f<\/strong> \u5927\u5c0f\u7528\u6765\u5728\u6808\u4e0a\u5206\u914d\u7a7a\u95f4\uff0c\u5185\u8054\u6210\u5458\u7684\u6784\u9020<\/li>\n
  • Flags<\/strong> flags<\/code>\u7528\u4e8e\u6307\u5b9a\u4e00\u4e9b\u8ddfQTypeInfo<\/code>\u76f8\u540c\u7684\u4fe1\u606f\u6216\u8f6c\u6362\u65b9\u5f0f<\/li>\n
  • \u81ea\u5b9a\u4e49\u8f6c\u6362\u51fd\u6570<\/strong> \u901a\u8fc7QMetaType::registerConverter<\/code>\u8bbe\u7f6e<\/li>\n
  • QMetaObject<\/strong> \u542b\u6709\u5143QObject<\/code>\u6570\u636e\u3002\u6b64\u5916\uff0c\u5982\u679c\u5b58\u5728\u7c7b\u578b\u4fe1\u606f\u7684\u8bdd\uff0c\u4e5f\u4f1a\u4fdd\u5b58\u5176\u4e2d<\/li>\n
  • \u3002\u3002\u3002<\/li>\n<\/ul>\n

    QTypeInfo<\/code><\/h3>\n

    QTypeInfo<\/code>\u662f\u4e00\u4e2a\u4e0eQMetaType<\/code>\u76f8\u4e92\u6b63\u4ea4\u7684trait class<\/em>\uff0c\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u901a\u8fc7Q_DECLARE_TYPEINFO<\/code>\u624b\u52a8\u6307\u5b9a\u7c7b\u578b\u662f\u5426\u53ef\u4ee5\u501f\u52a9memmove<\/code>\u79fb\u52a8\u6216\u7c7b\u578b\u7684\u6784\u9020\u51fd\u6570 \/\u6790\u6784\u51fd\u6570\u662f\u5426\u80fd\u591f\u8fd0\u884c\u3002QTypeInfo<\/code>\u4e3b\u8981\u7528\u4e8e\u4f18\u5316\u5bb9\u5668\u7684\u5b58\u50a8\u3002 \u4f8b\u5982\uff0c\u9690\u5f0f\u5206\u4eab\u7c7b\u53ef\u4ee5\u901a\u8fc7memmove<\/code>\u79fb\u52a8\u3002\u800c\u666e\u901a\u7684\u62f7\u8d1d\u5219\u9700\u8981\u5728\u62f7\u8d1d\u6784\u9020\u51fd\u6570\u4e2d\u589e\u52a0\u5f15\u7528\u8ba1\u6570\uff0c\u5728\u6790\u6784\u51fd\u6570\u7528\u51cf\u5c11\u5f15\u7528\u8ba1\u6570\u3002 C++11<\/code>\u5f15\u5165\u79fb\u52a8\u6784\u9020\u51fd\u6570\u548c\u6807\u51c6traits<\/code>\u7c7b\u578b\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f46\u662fQTypeInfo<\/code>\u662f\u5728C++11<\/code>\u4e4b\u524d\u8bbe\u8ba1\u51fa\u6765\u7684\uff0c\u5e76\u4e14\u9700\u8981\u517c\u5bb9\u4e00\u4e9b\u65e7\u7248\u672c\u7684\u7f16\u8bd1\u5668\uff0c\u6240\u4ee5\u53ea\u597d\u5c06\u5c31\u4f7f\u7528\u3002<\/p>\n

    \u5de5\u4f5c\u65b9\u5f0f<\/h2>\n

    \u56e0\u4e3a\u4e00\u4e9b\u5386\u53f2\u539f\u56e0\uff0c\u5bf9\u4e8e\u5185\u7f6e\u7c7b\u578b\u548c\u81ea\u5b9a\u4e49\u7c7b\u578b\u6709\u4e0d\u540c\u7684\u5904\u7406\u65b9\u5f0f\u3002\u5bf9\u4e8eQtCore<\/code>\u4e2d\u7684\u5185\u7f6e\u7c7b\u578b\uff0c\u6bcf\u4e2ameta-type<\/code>\u51fd\u6570\u90fd\u6307\u5b9a\u4e86\u7279\u5b9a\u7684\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002\u4e0d\u8fc7\u5728Qt5.0<\/code>\u4f7f\u7528\u6a21\u677f\u8fdb\u884c\u4e86\u91cd\u6784\u3002\u4f46\u8ba9\u6211\u4eec\u611f\u5174\u8da3\u7684\u662f\u5bf9\u81ea\u5b9a\u4e49\u7c7b\u578b\u5904\u65b9\u5f0f\u3002 QVector<QCustomTypeInfo><\/code>\u8fd9\u4e2a\u7c7b\u542b\u6709\u76f8\u5173\u4fe1\u606f\u548c\u4e00\u7cfb\u5217\u51fd\u6570\u6307\u9488\u3002<\/p>\n

    Q_DECLARE_METATYPE<\/code>\u5b8f<\/h3>\n

    \u8fd9\u4e2a\u5b8f\u9488\u5bf9\u4e8e\u7279\u6b8a\u7684\u7c7b\u578b\u7279\u5316\u4e86\u6a21\u677fQMetaTypeId<\/code>\u3002\u5b9e\u9645\u4e0a\uff0c\u5b83\u7279\u5316\u4e86\u6a21\u677f\u7c7bQMetaTypeId2<\/code>\u548c\u5927\u591a\u6570QMetaTypeId2<\/code>\u7528\u5230\u7684\u51fd\u6570\u3002\u8fd9\u91cc\u5e76\u4e0d\u6e05\u695a\u8fd9\u80cc\u540e\u7684\u539f\u56e0\u3002\u4e5f\u8bb8\u8fd9\u6837Qt<\/code>\u53ef\u4ee5\u6dfb\u52a0\u66f4\u591a\u7684\u5185\u7f6e\u7c7b\u578b\u800c\u4e0d\u4f1a\u7834\u574f\u4ee5\u524d\u4f7f\u7528Q_DECLARE_METATYPE<\/code>\u7684\u4ee3\u7801\u3002 QMetaTypeId<\/code>\u901a\u8fc7\u8c03\u7528qMetaType<T>()<\/code>\u4e2d\u7684QMetaTypeId::qt_metatype_id<\/code>\u5728\u7f16\u8bd1\u65f6\u6307\u5b9a\u7c7b\u578b\u6240\u5bf9\u5e94\u7684\u5143\u7c7b\u578bid<\/em>\u3002\u7b2c\u4e00\u6b21\u8c03\u7528\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u51fd\u6570\u4f1a\u8c03\u7528QMetaType<\/code>\u7684\u5185\u90e8\u51fd\u6570\u6765\u7ed9\u81ea\u5b9a\u4e49\u7c7b\u578b\u6ce8\u518c\u548c\u5206\u914d\u5143\u7c7b\u578bid<\/em>\uff0c\u540c\u65f6\u4f7f\u7528\u8c03\u7528\u8fd9\u4e2a\u5b8f\u65f6\u6240\u586b\u5199\u7684\u540d\u79f0\u3002\u8fd9\u4e9b\u4fe1\u606f\u4f1a\u88ab\u5b58\u50a8\u5728\u4e00\u4e2astatic<\/code>\u53d8\u91cf\u4e2d\u3002 \u9664\u4e86\u7c7b\u578b\u540d\u79f0\uff0c\u5176\u4ed6\u7684\u4fe1\u606f\u4f1a\u901a\u8fc7\u6a21\u677f\u5728\u7f16\u8bd1\u81ea\u52a8\u63a8\u5bfc\u3002<\/p>\n

    qRegisterMetaType<\/code><\/h3>\n

    \u4f7f\u7528Q_DECLARE_METATYPE<\/code>\u6ce8\u518c\u7684\u7c7b\u578b\u5c06\u5728\u9996\u6b21\u4f7f\u7528qMetaTypeId()<\/code>\u65f6\u8fdb\u884c\u5b9e\u9645\u6ce8\u518c\u5e76\u5206\u914d\u4e00\u4e2aid<\/em>\u3002\u4f7f\u7528QVariant<\/code>\u5c01\u88c5\u4e00\u4e2a\u7c7b\u578b\u5c31\u662f\u5178\u578b\u7684\u4f8b\u5b50\u3002\u4f46\u662f\u5728\u8fde\u63a5\u4fe1\u53f7\u548c\u69fd\u51fd\u6570\u7684\u65f6\u5019\u5e76\u4e0d\u4f1a\u6ce8\u518c\uff0c\u8fd9\u9700\u8981\u4f60\u4f7f\u7528qRegisterMetaType<\/code>\u8fdb\u884c\u624b\u52a8\u6ce8\u518c\u3002<\/p>\n

    \u81ea\u52a8\u6ce8\u518c<\/h2>\n

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    \u63a2\u7d22<\/h2>\n

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    template<typename T> QMetaTypeId {     static int qt_metatype_id() {         static int typeId = QMetaType::registerMetaType(\/*...*\/);         return typeId;     } }; <\/code><\/pre>\n
    \u6309\u7167C++<\/code>\u7684\u6807\u51c6\u5b9e\u73b0\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u7c7b\u578b\u90fd\u4f1a\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u5b9e\u4f8b\u6765\u751f\u6210QMetaTypeId::qt_metatype_id()::typeId<\/code>\u3002\u4f46\u662f\u5b9e\u9645\u4e0a\u4e00\u4e9b\u7f16\u8bd1\u5668\u548c\u94fe\u63a5\u5668\u5e76\u4e0d\u9075\u5b88\u8fd9\u4e9b\u89c4\u5219\u3002\u7279\u522b\u7684\uff0c\u5728Windows<\/code>\u4e0a\uff0c\u5373\u4fbf\u4f7f\u7528\u4e86\u5bfc\u51fa\u5b8f\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u5e93\u8fd8\u662f\u53ea\u4f1a\u751f\u6210\u4e00\u4efd\u5b9e\u4f8b\u3002\u56e0\u6b64\u6211\u4eec\u59cb\u7ec8\u9700\u8981\u4e00\u4e2a\u6211\u4eec\u6ca1\u6709\u7684\u540d\u79f0\u6807\u8bc6\u7b26\uff0c\u6240\u6709\u5728Qt5<\/code>\u4e0a\uff0c\u8fd8\u662f\u9700\u8981\u901a\u8fc7\u6ce8\u518c\u7c7b\u578b\u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u540d\u79f0\u3002<\/p>\n<\/p><\/div>\n
     \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (2<\/span>)        <\/div>\n
     <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
      \n
    • \n
      \n
      \n
       \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : wzzzx <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u54c8\u54c8\uff0c\u6709\u7ffb\u8bd1\u7684\u4e0d\u597d\u7684\u5730\u65b9\u8bf7\u591a\u591a\u6307\u6559~                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n
      \n
      \n
       \u8cc7\u6df1\u5927\u4f6c : QBugHunter <\/span>  <\/div>\n
       <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                   \u9a6c\u514b\u4e00\u4e0b\uff0c\u8bdd\u8bf4 qt6 \u5feb\u51fa\u4e86\u5427                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
    • \n","protected":false},"excerpt":{"rendered":"
      [\u7ffb\u8bd1] [Qt] \u901a\u8fc7 QMet…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/165284"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=165284"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/165284\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=165284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=165284"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=165284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}