\u56e0\u4e3aBoost.Iostreams\u63d0\u4f9b\u4e86\u5c01\u88c5Windows\u7684Handle\u7684\u652f\u6301\uff0c\u5229\u7528\u8fd9\u4e2a\u53ef\u4ee5\u7b80\u5316\u533f\u540d\u7ba1\u9053\u7684\u64cd\u4f5c\u3002\u6211\u60f3\u8981\u8fbe\u5230\u7684\u76ee\u6807\uff0c\u5148\u5b9e\u73b0\u8fd9\u6837\u4e00\u4e2a\u7b80\u5355\u7684\u547d\u4ee4\u884c\uff1a<\/p>\n
ffmpeg -i c:\\1.mp3 -acodec pcm_s16le -ac 2 -ar 44100 -f s16le - | oggenc2 -o c:\\1.ogg -q 1 -B 16 -C 2 -R 44100 -<\/pre>\n\u529f\u80fd\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u628a\u4e00\u4e2amp3\u6587\u4ef6\u8f6c\u6362\u6210ogg\u6587\u4ef6\u800c\u5df2\u3002\u7136\u800c\u8981\u8fbe\u5230\u8fd9\u4e2a\u76ee\u7684\uff0c\u8017\u4e86\u4e0d\u5c11\u7cbe\u529b\u2026\u2026<\/p>\n
\u9996\u5148\u662f\u7ba1\u9053\u3002Windows\u63d0\u4f9b\u4e86CreatePipe\u51fd\u6570\uff0c\u4e8e\u662f\u7b80\u5355\u6613\u61c2\u6211\u6765<\/p>\n
CreatePipe(&_hInputPipeForRead, &_hInputPipeForWrite, 0, 0);<\/pre>\n\u7136\u540e\u521b\u5efa\u8fdb\u7a0b\u7684\u65f6\u5019\uff0cSTARTUPINFO\u91cc\u7684dwFlags\u52a0\u4e0aSTARTF_USESTDHANDLES\uff0c\u628a\u7ba1\u9053\u8d4b\u503c\u8fc7\u53bb\uff0c\u8c03\u7528<\/p>\n
CreateProcess(0, &tmpbuf[0], 0, 0, FALSE, 0, 0, 0, &si, &pi)<\/pre>\n\u7ed3\u679c\u662fffmpeg\u79d2\u9000\u3002\u770b\u51fa\u9519\u4fe1\u606f\uff0c\u65e0\u6cd5\u6253\u5f00\u8f93\u51fa\u3002\u660e\u663e\u662f\u7ba1\u9053\u4e0d\u884c\u3002\u53bbWindows\u00a0SDK\u7684\u6587\u6863\u770b\u4e86\u534a\u5929\u4f8b\u5b50\uff0c\u7422\u78e8\u4e86\u4e24\u4e0b\uff0c\u662fHANDLE\u6ca1\u6709\u88ab\u7ee7\u627f\u7ed9\u5b50\u8fdb\u7a0b\u7684\u539f\u56e0\u3002\u90a3\u597d\uff0c\u628aCreateProcess\u91cc\u7684\u90a3\u4e2aFALSE\u6539\u6210TRUE\u3002\u8fd0\u884c\uff0c\u79d2\u9000\uff08\u6b7b\u76ee<\/p>\n
\u518d\u770b\u90a3\u4e2a\u4f8b\u5b50\uff0c\u5b83\u521b\u5efa\u7ba1\u9053\u7684\u65f6\u5019\u4e13\u95e8\u8bbe\u7f6e\u4e86\u4e00\u4e0b\u5b89\u5168\u5c5e\u6027\u3002\u90a3\u6211\u4e5f\u6765<\/p>\n
SECURITY_ATTRIBUTES saAttr;\r\n saAttr.nLength = sizeof(saAttr);\r\n saAttr.bInheritHandle = TRUE;\r\n saAttr.lpSecurityDescriptor = NULL;\r\n\r\n CreatePipe(&_hInputPipeForRead, &_hInputPipeForWrite, &saAttr, 0);<\/pre>\n\u597d\uff0c\u8fd9\u4e0bffmpeg\u8fd0\u884c\u8d77\u6765\u5728\u8fdb\u7a0b\u5217\u8868\u91cc\u53ef\u4ee5\u770b\u5230\u4e86\uff0c\u00a0\u6ca1\u6709\u79d2\u9000\u4e86\u3002\u63a5\u4e0b\u6765\u81ea\u5df1\u5199\u4e00\u4e2a\u7c7b\u6765\u5c01\u88c5\u8fd9\u4e2a\u8fdb\u7a0b\u7684\u8f93\u5165\u8f93\u51fa\uff0c\u6211\u7684\u8bdd\u662f\u8fd9\u4e48\u641e\u7684<\/p>\n
class process_io {\r\n public:\r\n typedef char char_type;\r\n typedef bio::bidirectional_device_tag category;\r\n\r\n enum {SOURCE_NONE = 0, SOURCE_STDIN, SOURCE_STDOUT, SOURCE_STDERR};\r\n\r\n process_io(const char* strCmdLine, int inputSource = SOURCE_NONE, int outputSource = SOURCE_NONE);\r\n ~process_io();\r\n bool start();\r\n bool close();\r\n void terminate();\r\n bool wait(int milliseseconds);\r\n\r\n std::streamsize read(char* s, std::streamsize n);\r\n std::streamsize write(const char* s, std::streamsize n);\r\n private:\r\n ...\r\n};<\/pre>\n\u6790\u6784\u51fd\u6570\u91cc\u9762\u7ec8\u6b62\u8fdb\u7a0b\u3002\u7136\u540e\u7167\u7740\u6559\u5b66\uff0c\u6765<\/p>\n
bio::stream<process_io> p1(\"d:\\\\tools\\\\ffmpeg.exe -i c:\\\\1.mp3 -acodec pcm_s16le -ar 44100 -ac 2 -f s16le -\", process_io::SOURCE_NONE, process_io::SOURCE_STDOUT);<\/pre>\n\u2026\u2026\uff08\u771f\u5fc3\u6b7b\u7684\u5feb\u6709\u6728\u6709\u554a\uff09\u3002\u8fd9\u4e0b\u8fdeffmpeg\u7684\u8fdb\u7a0b\u90fd\u770b\u4e0d\u5230\u4e86\u3002\u5728terminate\u91cc\u9762\u4e0b\u4e00\u4e2a\u65ad\u70b9\uff0c\u8fd0\u884c\uff0c\u679c\u65ad\u53d1\u73b0\u6790\u6784\u51fd\u6570\u88ab\u8c03\u7528\u4e86\u3002\u8fd9\u5c3c\u739b\u2026\u2026\u6211\u660e\u660e\u624d\u521b\u5efa\u5bf9\u8c61\u4f60\u5c31\u7ed9\u6211\u6790\u6784\u3002\u4e00\u60f3\uff0c\u4ec0\u4e48\u65f6\u5019\u4e00\u8fb9\u6784\u9020\u4e00\u8fb9\u8fd8\u6709\u6790\u6784\uff0c\u5927\u6982\u662f\u5b83\u7ed9\u6211process_io\u590d\u5236\u4e00\u4efd\u81ea\u5df1\u7559\u7740\u4e86\u7136\u540e\u6211\u7684\u5c31\u88ab\u4e22\u6389\u4e86\u5427\u3002\u5367\u69fd\uff0c\u201c\u590d\u5236\u4e00\u4efd\u201d\uff1f\uff01boost\u4f60\u5728\u5e72\u4ec0\u4e48\uff08\u6276\u989d\uff09<\/p>\n
\u4e0a\u7f51\u4e00\u641c\uff0c\u679c\u7136\u51fa\u6765\u4e86\u8fd9\u4e2a<\/p>\n
http:\/\/lists.boost.org\/Archives\/boost\/2005\/10\/95913.php<\/a><\/p><\/blockquote>\n
\u56e0\u4e3a\u6211\u5199\u7684\u8fd9\u4e2a\u7c7b\u6ca1\u6709\u590d\u5236\u6784\u9020\u51fd\u6570\uff0cC++\u7ed9\u6211\u81ea\u5df1\u751f\u6210\u4e86\u4e00\u4e2a\uff0c\u8fd8\u662f\u6d45\u590d\u5236\u7684\u3002HANDLE\u4e0d\u80fd\u7ed9\u4f60\u8fd9\u6837\u641e\u554a\uff08\u9524\u5730\uff09\u3002\u90a3\u6211\u5c31\u5148\u628a\u81ea\u5df1\u8fd9\u4e2a\u7c7b\u7684\u590d\u5236\u529f\u80fd\u7ed9\u5f04\u6b8b\uff0c\u58f0\u660e\u4e00\u4e2a\u590d\u5236\u6784\u9020\u51fd\u6570\u4f46\u4e0d\u5b9e\u73b0\u3002\u7136\u540e\u6309\u7167\u8fd9\u90ae\u4ef6\u5217\u8868\u91cc\u9762\u7ed9\u51fa\u7684\u56de\u590d\uff0c\u7528boost::reference_wrapper\u7ed9\u641e\u4e00\u4e0b\uff1a<\/p>\n
bio::stream<boost::reference_wrapper<process_io>> p1;\r\n\u00a0process_io p1_impl(\"d:\\\\tools\\\\ffmpeg.exe -i c:\\\\1.mp3 -acodec pcm_s16le -ar 44100 -ac 2 -f s16le -\", process_io::SOURCE_NONE, process_io::SOURCE_STDOUT);\r\n p1.open(boost::ref(p1_impl));<\/pre>\n\u7f16\u8bd1\uff0c\u901a\u8fc7\u3002\u56e0\u4e3a\u590d\u5236\u6784\u9020\u51fd\u6570\u5df2\u7ecf\u6b8b\u4e86\uff0c\u6240\u4ee5\u786e\u5b9a\u5b83\u6ca1\u6709\u7ed9\u6211\u590d\u5236\u3002<\/p>\n
\u7136\u540e\u641e\u51fa\u4e86\u5982\u4e0bmain\u51fd\u6570\u7528\u4e8e\u6d4b\u8bd5\u4ee3\u7801\u80fd\u4e0d\u80fd\u7528\uff1a<\/p>\n
int main() {\r\n bio::stream<boost::reference_wrapper<process_io>> p1;\r\n bio::stream<boost::reference_wrapper<process_io>> p2;\r\n process_io p1_impl(\"d:\\\\tools\\\\ffmpeg.exe -i c:\\\\1.mp3 -acodec pcm_s16le -ar 44100 -ac 2 -f s16le -\", process_io::SOURCE_NONE, process_io::SOURCE_STDOUT);\r\n process_io p2_impl(\"c:\\\\oggenc2 -o c:\\\\1.ogg -B 16 -R 44100 -C 2 -q 2 -\", process_io::SOURCE_STDIN);\r\n p1.open(boost::ref(p1_impl));\r\n p2.open(boost::ref(p2_impl));\r\n while(!p1.eof()) {\r\n char buf[1024];\r\n p1.read(buf, 1024);\r\n int len = p1.gcount();\r\n p2.write(buf, len);\r\n }\r\n p1.close();\r\n p2.close();\r\n return 0;\r\n}<\/pre>\n\u80fd\u8f6c\u6362\uff0c\u4f46\u662f\u8f6c\u6362\u5b8c\u8fdb\u7a0b\u5c31\u5361\u5f97\u6b7b\u6b7b\u7684\u4e86\u3002\u5728p1.read\u90a3\u8fb9\u4e0d\u52a8\u4e86\u3002<\/p>\n
\u65e2\u7136\u7ba1\u9053\u7684\u53e6\u4e00\u8fb9\u90fd\u5df2\u7ecf\u88ab\u5173\u95ed\u4e86\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u8fb9ReadFile\u4e0d\u76f4\u63a5\u8fd4\u56de\u800c\u662f\u5361\u6b7b\uff1f\u53c8\u4ed4\u7ec6\u60f3\u60f3Windows SDK\u91cc\u9762\u90a3\u4e2a\u793a\u4f8b\u4ee3\u7801\uff0c\u81ea\u5df1\u521b\u5efa\u4e86\u4e00\u4e2a\u7ba1\u9053\uff0c\u4e00\u4e2a\u7528\u4e8e\u8bfb\u4e00\u4e2a\u7528\u4e8e\u5199\uff0c\u8bfb\u7684\u81ea\u5df1\u7559\u7740\u5199\u7684\u62ff\u53bb\u7ed9\u5b50\u8fdb\u7a0b\u5199\uff0c\u5199\u5b8c\u4ee5\u540e\u5b50\u8fdb\u7a0b\u628a\u5199\u7684\u5173\u6389\u2026\u2026\u7b49\u4e0b\uff0c\u53ea\u6709\u5b50\u8fdb\u7a0b\u5173\u6ca1\u7528\u554a\uff0c\u81ea\u5df1\u8fd9\u8fb9\u4e5f\u8981\u5173\u554a\uff0c\u8fd9\u4e2aHANDLE\u624d\u7b97\u662f\u5b8c\u5168\u91ca\u653e\u4e86\u3002\u54e6\u6211\u628aHANDLE\u7ed9\u5b50\u8fdb\u7a0b\u4e4b\u540e\u81ea\u5df1\u8fd8\u7559\u7740\u3002OK\uff0c\u90a3\u6211\u5c31\u5728CreateProcess\u4e4b\u540e\u628a\u4e0d\u7528\u7684HANDLE\u7ed9\u5173\u6389\u3002\u518d\u8bd5\uff0cOK\u53ef\u4ee5\u6b63\u5e38\u7ed3\u675f\u4e86\u3002<\/p>\n
\u8865\u5145\uff1a<\/p>\n
\u591a\u4e2a\u8fdb\u7a0b\u4e92\u76f8\u4ea4\u4e92\u7684\u65f6\u5019\uff0c\u53c8\u51fa\u4e86\u70b9\u95ee\u9898\u3002\u660e\u660e\u5173\u6389\u4e86hStdInput\u7684HANDLE\uff0c\u4f46\u662f\u8fdb\u7a0b\u5374\u6ca1\u6709\u8ba4\u4e3a\u8bfb\u5230\u4e86end\uff0c\u8fd8\u5728\u7ee7\u7eed\u7b49\u5f85\u6570\u636e\u3002\u53c8\u662f\u591a\u4f59\u7684HANDLE\u7684\u95ee\u9898\uff0c\u4f46\u662f\u600e\u4e48\u627e\u5374\u627e\u4e0d\u5230\u54ea\u91cc\u591a\u51fa\u6765\uff1a\u8be5\u5173\u7684\u5173\u6389\u4e86\u3002\u6700\u540e\u7528processexporer\u67e5\u770b\uff0c\u53d1\u73b0\u5b50\u8fdb\u7a0b\u4e5f\u6301\u6709\u4e00\u4e2a\u548c\u6211\u5173\u6389\u7684HANDLE\u7684value\u4e00\u6837\u7684HANDLE\u3002\u4e8e\u662f\u53c8\u60f3\u8d77Windows\u00a0SDK\u4e0a\u90a3\u4e2a\u4f8b\u5b50\uff0c\u679c\u7136\u8fd8\u662f\u56e0\u4e3a\u6ca1\u6709\u5b8c\u5168\u6309\u7167\u4f8b\u5b50\u505a\u7684\u7f18\u6545\uff1a\u81ea\u5df1\u7559\u4e0b\u6765\u7528\u6765\u8bfb\u5199\u7684HANDLE\u7ed9\u7ee7\u627f\u5230\u5b50\u8fdb\u7a0b\u91cc\u9762\u53bb\u4e86\uff0c\u6240\u4ee5\u81ea\u5df1\u5173\u6389\u7ba1\u9053\u7684\u8f93\u5165HANDLE\u4ee5\u540e\u5b50\u8fdb\u7a0b\u8fd8\u6301\u6709\u4e00\u4e2a\u8f93\u5165HANDLE\u3002\u65b9\u6cd5\u5c31\u662f\u7528SetHandleInformation\u628a\u81ea\u5df1\u7559\u7740\u7528\u7684\u90a3\u4e2aHANDLE\u7684\u7ee7\u627f\u5c5e\u6027\u53bb\u6389\uff0c\u624d\u5f97\u4ee5\u6b63\u5e38\u3002<\/p>\n
\u5c0f\u603b\u7ed3\u4e00\u4e0b\uff1a<\/p>\n
1\u3001\u8981\u628a\u7ba1\u9053\u7684\u67d0\u4e2aHANDLE\u4f20\u7ed9\u5b50\u8fdb\u7a0b\uff0c\u8981\u6ce8\u610f\u652f\u6301\u7ee7\u627f<\/p>\n
2\u3001\u590d\u5236\u6784\u9020\u51fd\u6570\u5982\u679c\u6ca1\u5199\u7684\u8bdd\uff0c\u4e0d\u786e\u5b9a\u4eba\u5bb6\u4f1a\u600e\u4e48\u7528\u4f60\u7684\u7c7b\uff0c\u90a3\u5c31\u58f0\u660e\u4e00\u4e2a\u590d\u5236\u6784\u9020\u51fd\u6570\u4f46\u662f\u4e0d\u5b9e\u73b0<\/p>\n
3\u3001\u6ca1\u7528\u7684HANDLE\u8d81\u65e9\u5173\u6389\uff0c\u5982\u679c\u5141\u8bb8\u7ee7\u627f\u7684\uff0c\u56e0\u4e3a\u7ba1\u9053\u4e00\u5957\u662f\u4e24\u4e2a\uff0c\u6240\u4ee5\u5982\u679c\u8bbe\u4e86\u7ee7\u627f\u90a3\u4e48\u5c31\u662f\u4e24\u4e2a\u90fd\u7ed9\u4f60\u7ee7\u627f\u3002<\/p>\n
\u5b8c\u6574\u7684\u4ee3\u7801\u4e0b\u8f7d\uff1a pipe_test<\/a><\/p>\n
\u6b64\u4ee3\u7801\u53ea\u662f\u8bd5\u7740\u73a9\u7684\u65f6\u5019\u7528\u7684\u3002\u4ee3\u7801\u7a33\u5b9a\u6027\u3001\u5f3a\u5ea6\u7b49\u90fd\u8fd8\u2026\u2026 -_,- \u968f\u4fbf\u4e71\u8c03\u7528\u91cc\u9762\u7684\u51fd\u6570\u7a0b\u5e8f\u8fd8\u662f\u4f1a\u5d29\u7684\uff08\u4e00\u5806\u4e1c\u897f\u90fd\u6ca1\u68c0\u67e5\u55ef\u2026\u2026<\/p>\n
\u8865\u5145\u8bf4\u660e\u4e00\u4e0b\uff0cboost.iostreams\u91cc\u9762\u641e\u51fa\u6765\u8fd9\u7c7bread\u548cwrite\u4e0d\u7ed9\u4f60\u540c\u65f6\u8c03\u7528\u7684\uff0c\u91cc\u9762\u62ff\u9501\u9501\u7740\u3002\u540c\u65f6\u8c03\u7528\u4f1a\u6709\u4e00\u4e2a\u963b\u585e\u3002\u4e0d\u77e5\u9053\u662f\u4e0d\u662f\u53ef\u4ee5\u8bbe\u7f6e\u6210\u5141\u8bb8\uff0c\u6211\u73b0\u5728\u6700\u65b0\u4ee3\u7801\uff08\u6ca1\u4f20\u4e0a\u6765\uff09\u6682\u65f6\u662f\u628ainput\u548coutput\u641e\u6210\u4e24\u4e2a\u7c7b\u3002<\/p>\n
<\/p>\n
pre<\/p>\n","protected":false},"excerpt":{"rendered":"
\u56e0\u4e3aBoost.Iostreams\u63d0\u4f9b\u4e86\u5c01\u88c5Windows\u7684Handle\u7684\u652f\u6301\uff0c\u5229\u7528\u8fd9\u4e2a\u53ef\u4ee5\u7b80\u5316\u533f\u540d\u7ba1\u9053\u7684\u64cd\u4f5c … \u7ee7\u7eed\u9605\u8bfb\u4f7f\u7528Windows\u7684\u533f\u540d\u7ba1\u9053\u548cBoost.Iostreams<\/span>