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#define INTF_IMP_REFCOUNT(BASE) \\\r\n ULONG __stdcall AddRef() { return BASE::_AddRef();} \\\r\n ULONG __stdcall Release(){ return BASE::_Release();}\\\r\n HRESULT __stdcall QueryInterface(REFIID iid, void*p) { return BASE::QueryInterface(iid, p);}\r\n<\/pre>\n\u5728\u76f8\u5e94\u63a5\u53e3\u7684\u5b9a\u4e49\u91cc\u52a0\u5165\u5b83\u5c31OK\uff0c\u5982TForm1\u6211\u4eec\u5b9e\u73b0\u4e86\u63a5\u53e3ITest\uff0c\u90a3\u4e48\u4ee3\u7801\u53c2\u8003\u5982\u4e0b\uff1a<\/p>\n
class TForm1:public TForm, public ITest\r\n{\r\n...\r\npublic:\r\n INTF_IMP_REFCOUNT(TForm)\r\n};<\/pre>\n\u7136\u540e\u518d\u8c03\u7528TForm1\u7684QueryInterface\u5c31\u6ca1\u6709\u95ee\u9898\u4e86\u3002<\/p>\n
\u73b0\u5728\u603b\u7ed3\u4e00\u4e0bC++ Builder\u4e2d\u4f7f\u7528\u63a5\u53e3\u7684\u57fa\u672c\u89c4\u5219\uff1a<\/p>\n
1\u3001\u9996\u5148\uff0c\u8981\u901a\u8fc7QueryInterface\u6765\u83b7\u53d6\u4e00\u4e2a\u63a5\u53e3\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u5fc5\u9700\u4fdd\u8bc1\u5b9e\u73b0\u4e86AddRef\/Release\u51fd\u6570\uff0c\u56e0\u4e3a\u4f60\u7684TInterfacedObject\u5f88\u9057\u61be\u7684\u6ca1\u6709\u5b9e\u73b0AddRef\/Release\uff0cTInterfacedObject\u5b9e\u73b0\u7684\u662f_AddRef\/_Release\uff0cDelphi\u8c03\u7528\u7684\u5b83\uff0c\u4f46CB\u5374\u6ca1\u6709\uff0c\u6240\u4ee5\u4f60\u9700\u8981\u81ea\u5df1\u52a0\u5165AddRef\/Release\u7684\u5b9e\u73b0\u3002<\/p>\n
2\u3001C++ Builder\u7684systobj.h\u5b9e\u73b0\u4e86\u4e00\u4e2aTCppInterfacedObject\uff0c\u53ea\u80fd\u8bf4\u9e21\u808b\u3002\u9996\u5148\u662fVCL\u5bf9\u8c61\u4e0d\u5141\u8bb8\u591a\u91cd\u7ee7\u627f\uff0c\u50cfTForm\u5565\u7684\u73b0\u6210\u7684\u7ec4\u4ef6\u4e0a\uff0c\u4f60\u8981\u7ee7\u627f\u5b9e\u73b0\u4e00\u4e2a\u63a5\u53e3\uff0c\u5c31\u6ca1\u6cd5\u7ee7\u627f\u81ea\u5b83\uff0c\u5b9e\u9645\u4e0a\u4f60\u8fd8\u662f\u9700\u8981\u91cd\u5199\u5b83\u3002\u91cd\u5199\u4e5f\u5c31\u91cd\u5199\u5427\uff0c\u7ed3\u679c\u4e24\u4e2a\u63a5\u53e3\u8fd8\u4e0d\u4e00\u81f4\uff0c\u9020\u6210\u8b66\u544a\u3002<\/p>\n
3\u3001\u6240\u6709\u7684\u63a5\u53e3\u5fc5\u9700\u7ee7\u627f\u81eaIUnknown\uff0c\u5426\u5219QueryInterface\u4f1a\u50bb\u6389\u3002<\/p>\n
4\u3001\u5982\u679c\u4f60\u662f\u7c7b\u7684\u5b9e\u4f8b\u5730\u5740\uff0c\u90a3\u4e48\u76f4\u63a5\u7528dynamic_cast<\u63a5\u53e3\u7c7b\u578b*>(\u5bf9\u8c61\u5b9e\u4f8b)\u8981\u6bd4QueryInterface\u597d\u7684\u591a\uff0c\u56e0\u4e3a\u5728C++\u91cc\uff0c\u6240\u6709\u7684\u63a5\u53e3\u662f\u7eaf\u865a\u51fd\u6570\uff0c\u6240\u4ee5\u5b50\u7c7b\u80af\u5b9a\u53ef\u4ee5\u8f6c\u6362\u6210\u7236\u7c7b\u3002<\/p>\n
5\u3001\u5982\u679c\u4f60\u5f97\u5230\u7684\u662fIUnknown\u7684\u63a5\u53e3\u5b9e\u4f8b\uff0c\u53ef\u4ee5\u7528interface_cast\u6216\u8005\u7528QueryInterface\u65b9\u6cd5\u4e86\u3002<\/p>\n
\u7b80\u5355\u9644\u4e00\u4e0binterface\u7684\u8bed\u6cd5\uff1a<\/p>\n
interface\/struct declspec(uuid(GUID\u7f16\u7801\u5b57\u7b26\u4e32)) \u63a5\u53e3\u7c7b\u578b\u540d\u79f0:public \u7236\u63a5\u53e3\u7c7b\u578b\r\n{\r\nvirtual \u51fd\u6570\u540d(\u51fd\u6570\u53c2\u6570)=0;\r\n...\r\n};<\/pre>\n\u5b9e\u9645\u4e0a\u5728C++\u4e2d\uff0cinterface\u4e5f\u4e0d\u8fc7\u662fstruct\uff0c\u6240\u4ee5\u4e24\u8005\u5199\u6210\u5565\u90fd\u884c\u3002<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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