{"id":277,"date":"2013-05-26T17:54:20","date_gmt":"2013-05-26T09:54:20","guid":{"rendered":"http:\/\/blog.dayandcarrot.net\/?p=277"},"modified":"2013-05-26T17:54:20","modified_gmt":"2013-05-26T09:54:20","slug":"c-gossip-%e9%9a%a8%e6%a9%9f%e5%ad%98%e5%8f%96%e6%aa%94%e6%a1%88","status":"publish","type":"post","link":"https:\/\/dayandcarrot.space\/?p=277","title":{"rendered":"C++ Gossip: \u96a8\u6a5f\u5b58\u53d6\u6a94\u6848"},"content":{"rendered":"<p>\u672c\u6587\u6765\u81ea\uff1ahttp:\/\/openhome.cc\/Gossip\/CppGossip\/RadomAccessFile.html<\/p>\n<table border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td><small>\u4f7f\u7528 get \u6307\u6a19\u6216 put \u6307\u6a19\uff0c\u53ef\u4ee5\u81ea\u7531\u7684\u79fb\u52d5\u81f3\u6a94\u6848\u4e2d\u6307\u5b9a\u7684\u4f4d\u7f6e\u9032\u884c\u8b80\u53d6\u6216\u5beb\u5165\u7684\u52d5\u4f5c\uff0c\u901a\u5e38\u96a8\u6a5f\u5b58\u53d6\u6a94\u6848\u6703\u4f7f\u7528\u4e8c\u9032\u4f4d\u6a21\u5f0f\u9032\u884c\uff0c\u6587\u5b57\u6a21\u5f0f\u958b\u555f\u7684\u6a94\u6848\u4e26\u4e0d\u9069\u5408\u4f5c\u96a8\u6a5f\u5b58\u53d6\u7684\u52d5\u4f5c\u3002<br \/>\n\u5982\u4f55\u5229\u7528\u96a8\u6a5f\u5b58\u53d6\u4f86\u8b80\u5beb\u6240\u6709\u7684\u8cc7\u6599\uff0c\u5fc5\u9808\u8996\u60a8\u7684\u9700\u6c42\u800c\u5b9a\uff0c\u9700\u6c42\u6c7a\u5b9a\u60a8\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u9019\u908a\u4ee5\u4e00\u500b\u6700\u7c21\u55ae\u7684\u4f8b\u5b50\u4f86\u793a\u7bc4\u96a8\u6a5f\u5b58\u53d6\uff0c\u5beb\u5165\u6a94\u6848\u6642\u90fd\u662f\u4f7f\u7528\u56fa\u5b9a\u5927\u5c0f\u7684struct\uff0c\u7531\u65bc\u8cc7\u6599\u5927\u5c0f\u56fa\u5b9a\uff0c\u9019\u53ef\u4ee5\u65b9\u4fbf\u660e\u78ba\u7684\u6307\u5b9a\u6a94\u6848\u4e2d\u8b80\u53d6\u7684\u4f4d\u7f6e\u3002<br \/>\n\u5047\u8a2d\u6709\u4e00\u500b\u7c21\u55ae\u7684\u5b78\u751f\u6210\u7e3e\u8cc7\u6599\u5982\u4e0b\uff1a<br \/>\n<\/small><\/p>\n<ul>\n<li><small>Student.h<\/small><\/li>\n<\/ul>\n<pre>#ifndef DATASTRU_H\n#define DATASTRU_H\nstruct Student {\n    int studyNumber;\n    char name[80];\n    double score;\n};\n#endif<\/pre>\n<p><small>\u4e00\u500b\u7d50\u69cb\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0c\u7576\u8981\u5beb\u5165\u4e00\u500b\u7d50\u69cb\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u9019\u6a23\u7684\u8a9e\u6cd5\uff1a<br \/>\n<\/small><\/p>\n<div><small>fout.write(reinterpret_cast&lt;const char*&gt; (&amp;student), <\/small><br \/>\n<small>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 sizeof(Student)); <\/small><\/div>\n<p><small><br \/>\n\u5176\u4e2dstudent\u662fStudent\u81ea\u8a02struct\u6240\u5ba3\u544a\u7684\u8b8a\u6578\u540d\u7a31\uff0c\u7531\u65bcwrite\u63a5\u53d7const char*\u578b\u614b\u7684\u8b8a\u6578\uff0c\u6240\u4ee5\u4f7f\u7528reinterpret_cast&lt;const char*&gt; \u5c07\u4e4b\u8f49\u63db\u70baconst char*\u6307\u6a19\u3002<br \/>\n\u4e0b\u9762\u9019\u500b\u7a0b\u5f0f\u793a\u7bc4\uff0c\u5982\u4f55\u5efa\u7acb\u4e00\u500b\u6a94\u6848\uff0c\u7576\u4e2d\u5305\u62ec50\u7b46\u7a7a\u7684\u8cc7\u6599\uff1a<br \/>\n<\/small><\/p>\n<ul>\n<li>main.cpp<\/li>\n<\/ul>\n<pre>#include &lt;iostream&gt;\n#include &lt;fstream&gt;\n#include \"Student.h\"\nusing namespace std;\nint main(int argc, char* argv[]) {\n    if(argc != 2) {\n        cout &lt;&lt; \"\u6307\u4ee4: create &lt;filename&gt;\" &lt;&lt; endl;\n        return 1;\n    }\n    ofstream fout(argv[1], ios::binary);\n    if(!fout) {\n        cerr &lt;&lt; \"\u6a94\u6848\u8f38\u51fa\u5931\u6557\" &lt;&lt; endl;\n        return 1;\n    }\n    int count;\n    cout &lt;&lt; \"\u8981\u5efa\u7acb\u5e7e\u7b46\u8cc7\u6599\uff1f \";\n    cin &gt;&gt; count;\n    Student student = {0, \"\", 0.0};\n    for(int i = 0; i &lt; count; i++) {\n        fout.write(reinterpret_cast&lt;const char*&gt; (&amp;student),\n            sizeof(Student));\n    }\n    fout.close();\n    return 0;\n}<\/pre>\n<p><small>\u57f7\u884c\u7d50\u679c\uff1a <\/small><\/p>\n<table border=\"0\" cellspacing=\"2\" cellpadding=\"2\">\n<tbody>\n<tr>\n<td><small>create data.bin<br \/>\n\u8981\u5efa\u7acb\u5e7e\u7b46\u8cc7\u6599\uff1f 50<\/small><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><small>\u63a5\u4e0b\u4f86\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u9019\u500b\u7a0b\u5f0f\u9032\u884c\u96a8\u6a5f\u5b58\u53d6\uff0c\u4f7f\u7528\u5b78\u865f\u4f86\u4f5c\u8cc7\u6599\u7684\u4f4d\u7f6e\u6307\u5b9a\uff0c\u5c07\u4e4b\u5132\u5b58\u5728\u6a94\u6848\u4e2d\u7684\u6307\u5b9a\u4f4d\u7f6e\uff1a<br \/>\n<\/small><\/p>\n<pre>#include &lt;iostream&gt;\n#include &lt;fstream&gt;\n#include \"Student.h\"\nusing namespace std;\nint main(int argc, char* argv[]) {\n    Student student;\n    int count = 0;\n    if(argc &lt; 2) {\n        cerr &lt;&lt; \"\u6307\u4ee4: write &lt;filename&gt;\";\n        return 1;\n    }\n    fstream fio(argv[1], ios::in | ios::out | ios::binary);\n    if(!fio) {\n        cerr &lt;&lt; \"\u7121\u6cd5\u8b80\u53d6\u6a94\u6848\" &lt;&lt; endl;\n        return 1;\n    }\n    while(true) {\n        fio.read(reinterpret_cast&lt;char *&gt; (&amp;student),\n            sizeof(Student));\n        if(!fio.eof())\n            count++;\n        else\n            break;\n    }\n    fio.clear();\n    cout &lt;&lt; \"\u8f38\u5165\u5b78\u865f(1-\" &lt;&lt; count &lt;&lt; \")\"  &lt;&lt; endl\n         &lt;&lt; \"\u8f38\u51650\u96e2\u958b\";\n    while(true) {\n        cout &lt;&lt; \"n\u5b78\u865f? \";\n        cin &gt;&gt; student.studyNumber;\n        if(student.studyNumber == 0)\n            break;\n        cout &lt;&lt; \"\u8f38\u5165\u59d3\u540d, \u5206\u6578\" &lt;&lt; endl\n             &lt;&lt; \"? \";\n        cin &gt;&gt; student.name &gt;&gt; student.score;\n        fio.seekp((student.studyNumber - 1) * sizeof(Student));\n        fio.write(reinterpret_cast&lt;const char*&gt; (&amp;student),\n            sizeof(Student));\n    }\n    fio.close();\n    return 0;\n}<\/pre>\n<p><small>\u57f7\u884c\u7d50\u679c\uff1a <\/small><\/p>\n<table border=\"0\" cellspacing=\"2\" cellpadding=\"2\">\n<tbody>\n<tr>\n<td><small>write data.bin<br \/>\n\u8f38\u5165\u5b78\u865f(1-50)<br \/>\n\u8f38\u51650\u96e2\u958b<br \/>\n\u5b78\u865f? 1<br \/>\n\u8f38\u5165\u59d3\u540d, \u5206\u6578<br \/>\n? \u826f\u845b\u683c 88<br \/>\n\u5b78\u865f? 2<br \/>\n\u8f38\u5165\u59d3\u540d, \u5206\u6578<br \/>\n? \u6bdb\u59b9\u59b9 94<br \/>\n\u5b78\u865f? 5<br \/>\n\u8f38\u5165\u59d3\u540d, \u5206\u6578<br \/>\n? \u6bdb\u6bdb\u87f2 75<br \/>\n\u5b78\u865f? 0<\/small><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><small>\u63a5\u4e0b\u4f86\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u9019\u500b\u7a0b\u5f0f\u8b80\u53d6\u65b9\u624d\u6240\u8f38\u5165\u7684\u8cc7\u6599\uff1a<br \/>\n<\/small><\/p>\n<pre>#include &lt;iostream&gt;\n#include &lt;fstream&gt;\n#include \"Student.h\"\nusing namespace std;\nint main(int argc, char* argv[]) {\n    Student student;\n    int count = 0, number;\n    if(argc != 2) {\n        cout &lt;&lt; \"\u6307\u4ee4: read &lt;filename&gt;\" &lt;&lt; endl;\n        return 1;\n    }\n    ifstream fin(argv[1], ios::in | ios::binary);\n    if(!fin) {\n        cerr &lt;&lt; \"\u7121\u6cd5\u8b80\u53d6\u6a94\u6848\" &lt;&lt; endl;\n        return 1;\n    }\n    while(true) {\n        fin.read(reinterpret_cast&lt;char *&gt; (&amp;student),\n            sizeof(Student));\n        if(!fin.eof())\n            count++;\n        else\n            break;\n    }\n    fin.clear();\n    cout &lt;&lt; \"\u8f38\u5165\u5b78\u865f(1-\" &lt;&lt; count &lt;&lt; \")\"  &lt;&lt; endl\n         &lt;&lt; \"\u8f38\u51650\u96e2\u958b\";\n    while(true) {\n        cout &lt;&lt; \"n\u5b78\u865f? \";\n        cin &gt;&gt; number;\n        if(number == 0)\n            break;\n        else if(number &gt; count) {\n            cout &lt;&lt; \"\u8f38\u5165\u5b78\u865f(1-\" &lt;&lt; count &lt;&lt; \")\" &lt;&lt; endl;\n            continue;\n        }\n        cout &lt;&lt; \"n\u5b78\u865ft\u59d3\u540dtt\u5206\u6578\" &lt;&lt; endl;\n        fin.seekg((number - 1) * sizeof(Student));\n        fin.read(reinterpret_cast&lt;char*&gt; (&amp;student),\n            sizeof(Student));\n        cout &lt;&lt; student.studyNumber &lt;&lt; \"t\"\n             &lt;&lt; student.name &lt;&lt; \"tt\"\n             &lt;&lt; student.score &lt;&lt; endl;\n    }\n    fin.close();\n    return 0;\n}<\/pre>\n<p><small>\u57f7\u884c\u7d50\u679c\uff1a <\/small><\/p>\n<table border=\"0\" cellspacing=\"2\" cellpadding=\"2\">\n<tbody>\n<tr>\n<td><small>read data.bin<br \/>\n\u8f38\u5165\u5b78\u865f(1-50)<br \/>\n\u8f38\u51650\u96e2\u958b<br \/>\n\u5b78\u865f? 1<br \/>\n\u5b78\u865f\u00a0\u00a0\u00a0 \u59d3\u540d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5206\u6578<br \/>\n1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u826f\u845b\u683c\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 88<br \/>\n\u5b78\u865f? 2<br \/>\n\u5b78\u865f\u00a0\u00a0\u00a0 \u59d3\u540d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5206\u6578<br \/>\n2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6bdb\u59b9\u59b9\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 94<br \/>\n\u5b78\u865f? 3<br \/>\n\u5b78\u865f\u00a0\u00a0\u00a0 \u59d3\u540d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5206\u6578<br \/>\n0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0<br \/>\n\u5b78\u865f? 5<br \/>\n\u5b78\u865f\u00a0\u00a0\u00a0 \u59d3\u540d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5206\u6578<br \/>\n5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6bdb\u6bdb\u87f2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 75<br \/>\n\u5b78\u865f? 0<\/small><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><small>\u9019\u5e7e\u500b\u7a0b\u5f0f\u662f\u96a8\u6a5f\u5b58\u53d6\u7684\u7c21\u55ae\u793a\u7bc4\uff0c\u60a8\u4e5f\u53ef\u4ee5\u7d50\u5408\u8d77\u4f86\uff0c\u88fd\u4f5c\u4e00\u500b\u7c21\u6613\u7684\u6210\u7e3e\u767b\u8a18\u7a0b\u5f0f\u3002<br \/>\n\u5728\u5224\u65b7\u8cc7\u6599\u7b46\u6578\u6642\u9084\u6709\u66f4\u7c21\u55ae\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u958b\u555f\u6a94\u6848\u5f8c\u5148\u4f7f\u7528ios::end\u5c07\u6307\u6a19\u79fb\u81f3\u6a94\u6848\u5c3e\uff0c\u7136\u5f8c\u4f7f\u7528tellg()\u5f97\u5230\u76ee\u524d\u7684\u6a94\u6848\u6307\u6a19\u4f4d\u7f6e\uff0c\u518d\u9664\u4ee5\u8cc7\u6599\u7d50\u69cb\u7684\u5927\u5c0f\u9664\u53ef\u5f97\u77e5\u8cc7\u6599\u7b46\u6578\uff0c\u4f8b\u5982\uff1a<br \/>\n<\/small><\/p>\n<div><small>file.seekg(0, ios::end); <\/small><br \/>\n<small>count = file.tellg() \/ sizeof(\u8cc7\u6599\u7d50\u69cb); <\/small><\/div>\n<\/td>\n<td>\u00a0 <iframe loading=\"lazy\" id=\"google_ads_frame1\" name=\"google_ads_frame1\" src=\"http:\/\/googleads.g.doubleclick.net\/pagead\/ads?client=ca-pub-9750319131714390&amp;format=160x600_as&amp;output=html&amp;h=600&amp;w=160&amp;lmt=1364249724&amp;ad_type=text_image&amp;ea=0&amp;flash=11.5.502.146&amp;url=http%3A%2F%2Fopenhome.cc%2FGossip%2FCppGossip%2FRadomAccessFile.html&amp;dt=1369561123586&amp;bdt=1886&amp;shv=r20130516&amp;cbv=r20130206&amp;saldr=sb&amp;correlator=1369561123619&amp;frm=20&amp;adk=3099249962&amp;ga_vid=1701140719.1369561124&amp;ga_sid=1369561124&amp;ga_hid=1563172159&amp;ga_fc=0&amp;u_tz=480&amp;u_his=1&amp;u_java=1&amp;u_h=768&amp;u_w=1366&amp;u_ah=768&amp;u_aw=1293&amp;u_cd=32&amp;u_nplug=0&amp;u_nmime=0&amp;dff=adobe%20%E6%98%8E%E9%AB%94%20std%20l&amp;dfs=16&amp;adx=0&amp;ady=0&amp;biw=1276&amp;bih=653&amp;eid=86860100&amp;oid=3&amp;docm=7&amp;fu=0&amp;ifi=1&amp;dtd=52\" height=\"600\" width=\"160\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n<iframe loading=\"lazy\" id=\"google_ads_frame2\" name=\"google_ads_frame2\" src=\"http:\/\/googleads.g.doubleclick.net\/pagead\/ads?client=ca-pub-9750319131714390&amp;format=160x600_as&amp;output=html&amp;h=600&amp;w=160&amp;lmt=1364249724&amp;ad_type=text_image&amp;ea=0&amp;flash=11.5.502.146&amp;url=http%3A%2F%2Fopenhome.cc%2FGossip%2FCppGossip%2FRadomAccessFile.html&amp;dt=1369561123645&amp;bdt=1945&amp;shv=r20130516&amp;cbv=r20130206&amp;saldr=sb&amp;prev_fmts=160x600_as&amp;correlator=1369561123619&amp;frm=20&amp;adk=3099249962&amp;ga_vid=1701140719.1369561124&amp;ga_sid=1369561124&amp;ga_hid=1563172159&amp;ga_fc=0&amp;u_tz=480&amp;u_his=1&amp;u_java=1&amp;u_h=768&amp;u_w=1366&amp;u_ah=768&amp;u_aw=1293&amp;u_cd=32&amp;u_nplug=0&amp;u_nmime=0&amp;dff=adobe%20%E6%98%8E%E9%AB%94%20std%20l&amp;dfs=16&amp;adx=0&amp;ady=0&amp;biw=1276&amp;bih=653&amp;eid=86860100&amp;oid=3&amp;docm=7&amp;fu=0&amp;ifi=2&amp;dtd=24\" height=\"600\" width=\"160\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n<iframe loading=\"lazy\" id=\"google_ads_frame3\" name=\"google_ads_frame3\" src=\"http:\/\/googleads.g.doubleclick.net\/pagead\/ads?client=ca-pub-9750319131714390&amp;format=160x600_as&amp;output=html&amp;h=600&amp;w=160&amp;lmt=1364249724&amp;ad_type=text_image&amp;ea=0&amp;flash=11.5.502.146&amp;url=http%3A%2F%2Fopenhome.cc%2FGossip%2FCppGossip%2FRadomAccessFile.html&amp;dt=1369561123674&amp;bdt=1974&amp;shv=r20130516&amp;cbv=r20130206&amp;saldr=sb&amp;prev_fmts=160x600_as%2C160x600_as&amp;correlator=1369561123619&amp;frm=20&amp;adk=3099249962&amp;ga_vid=1701140719.1369561124&amp;ga_sid=1369561124&amp;ga_hid=1563172159&amp;ga_fc=0&amp;u_tz=480&amp;u_his=1&amp;u_java=1&amp;u_h=768&amp;u_w=1366&amp;u_ah=768&amp;u_aw=1293&amp;u_cd=32&amp;u_nplug=0&amp;u_nmime=0&amp;dff=adobe%20%E6%98%8E%E9%AB%94%20std%20l&amp;dfs=16&amp;adx=0&amp;ady=0&amp;biw=1276&amp;bih=653&amp;eid=86860100&amp;oid=3&amp;docm=7&amp;fu=0&amp;ifi=3&amp;dtd=15\" height=\"600\" width=\"160\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n<center><\/center><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<div><\/div>\n<div id=\"sougou_bottom\"><\/div>\n<div id=\"ext_stophi\">\n<div><\/div>\n<div>\n<h2>\u5173\u95ed\u63d0\u793a <a id=\"closenotice\" title=\"\u5173\u95ed\u63d0\u793a\" href=\"http:\/\/openhome.cc\/Gossip\/CppGossip\/RadomAccessFile.html#\">\u5173\u95ed<\/a><\/h2>\n<p id=\"sogouconfirmtxt\">\n<p><a id=\"sogouconfirm\" href=\"http:\/\/openhome.cc\/Gossip\/CppGossip\/RadomAccessFile.html#\">\u786e \u8ba4<\/a> <a id=\"sogoucancel\" href=\"http:\/\/openhome.cc\/Gossip\/CppGossip\/RadomAccessFile.html#\">\u53d6 \u6d88<\/a><\/div>\n<\/div>\n<div id=\"ext_overlay\"><\/div>\n<p><iframe loading=\"lazy\" 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