[{"data":1,"prerenderedAt":1860},["ShallowReactive",2],{"wiki-page-\u002Fwiki\u002F2023-10-05-cplusplus-jiao-xue\u002F1500-wen-jian-cao-zuo":3,"wiki-doc-items-2023-10-05-cplusplus-jiao-xue":1474},{"id":4,"title":5,"body":6,"chapterDepth":1461,"chapterOrder":1462,"date":1463,"description":208,"docKey":1464,"docRoot":1465,"docTitle":1466,"extension":1467,"isWikiDoc":229,"isWikiIndex":1468,"meta":1469,"navigation":229,"path":1470,"seo":1471,"stem":1472,"wikiDepth":215,"__hash__":1473},"wiki\u002Fwiki\u002F2023-10-05-Cplusplus教学\u002F1500-文件操作.md","文件操作",{"type":7,"value":8,"toc":1455},"minimark",[9,12,16,23,26,29,53,56,67,70,74,77,113,116,184,190,197,202,425,435,438,456,459,462,465,493,497,844,849,851,862,864,867,870,873,876,882,885,889,1163,1169,1171,1176,1179,1182,1188,1190,1192,1442,1446,1451],[10,11,5],"h2",{"id":5},[13,14,15],"p",{},"程序运行时产生的数据都属于临时数据，程序一旦运行结束都会被释放",[13,17,18,19],{},"通过",[20,21,22],"strong",{},"文件可以将数据持久化",[13,24,25],{},"C++中对文件操作需要包含头文件 ==\u003C fstream >==",[13,27,28],{},"文件类型分为两种：",[30,31,32,43],"ol",{},[33,34,35,38,39,42],"li",{},[20,36,37],{},"文本文件","     -  文件以文本的",[20,40,41],{},"ASCII码","形式存储在计算机中",[33,44,45,48,49,52],{},[20,46,47],{},"二进制文件"," -  文件以文本的",[20,50,51],{},"二进制","形式存储在计算机中，用户一般不能直接读懂它们",[13,54,55],{},"操作文件的三大类:",[30,57,58,61,64],{},[33,59,60],{},"ofstream：写操作",[33,62,63],{},"ifstream： 读操作",[33,65,66],{},"fstream ： 读写操作",[68,69,37],"h3",{"id":37},[71,72,73],"h4",{"id":73},"写文件",[13,75,76],{},"写文件步骤如下：",[30,78,79,86,92,98,104],{},[33,80,81,82,85],{},"包含头文件",[83,84],"br",{},"#include \u003Cfstream>",[33,87,88,89,91],{},"创建流对象",[83,90],{},"ofstream ofs;",[33,93,94,95,97],{},"打开文件",[83,96],{},"ofs.open(\"文件路径\",打开方式);",[33,99,100,101,103],{},"写数据",[83,102],{},"ofs \u003C\u003C \"写入的数据\";",[33,105,106,107,109,110,112],{},"关闭文件",[83,108],{},"ofs.close();",[83,111],{},"​",[13,114,115],{},"文件打开方式：",[117,118,119,132],"table",{},[120,121,122],"thead",{},[123,124,125,129],"tr",{},[126,127,128],"th",{},"打开方式",[126,130,131],{},"解释",[133,134,135,144,152,160,168,176],"tbody",{},[123,136,137,141],{},[138,139,140],"td",{},"ios::in",[138,142,143],{},"为读文件而打开文件",[123,145,146,149],{},[138,147,148],{},"ios::out",[138,150,151],{},"为写文件而打开文件",[123,153,154,157],{},[138,155,156],{},"ios::ate",[138,158,159],{},"初始位置：文件尾",[123,161,162,165],{},[138,163,164],{},"ios::app",[138,166,167],{},"追加方式写文件",[123,169,170,173],{},[138,171,172],{},"ios::trunc",[138,174,175],{},"如果文件存在先删除，再创建",[123,177,178,181],{},[138,179,180],{},"ios::binary",[138,182,183],{},"二进制方式",[13,185,186,189],{},[20,187,188],{},"注意："," 文件打开方式可以配合使用，利用|操作符",[13,191,192,193],{},"**例如：**用二进制方式写文件 ",[194,195,196],"code",{},"ios::binary |  ios:: out",[13,198,199],{},[20,200,201],{},"示例：",[203,204,209],"pre",{"className":205,"code":206,"language":207,"meta":208,"style":208},"language-cpp shiki shiki-themes github-light github-dark","#include \u003Cfstream>\n\nvoid test01()\n{\n    ofstream ofs;\n    ofs.open(\"test.txt\", ios::out);\n\n    ofs \u003C\u003C \"姓名：张三\" \u003C\u003C endl;\n    ofs \u003C\u003C \"性别：男\" \u003C\u003C endl;\n    ofs \u003C\u003C \"年龄：18\" \u003C\u003C endl;\n\n    ofs.close();\n}\n\nint main() {\n    \u002F\u002F 程序从 main 函数开始执行，下面的语句会按顺序运行。\n\n    test01();\n\n\n    \u002F\u002F 返回 0 表示程序正常结束。\n    return 0;\n}\n","cpp","",[194,210,211,224,231,245,251,257,281,286,304,318,332,337,348,354,359,371,378,383,391,396,401,407,420],{"__ignoreMap":208},[212,213,216,220],"span",{"class":214,"line":215},"line",1,[212,217,219],{"class":218},"szBVR","#include",[212,221,223],{"class":222},"sZZnC"," \u003Cfstream>\n",[212,225,227],{"class":214,"line":226},2,[212,228,230],{"emptyLinePlaceholder":229},true,"\n",[212,232,234,237,241],{"class":214,"line":233},3,[212,235,236],{"class":218},"void",[212,238,240],{"class":239},"sScJk"," test01",[212,242,244],{"class":243},"sVt8B","()\n",[212,246,248],{"class":214,"line":247},4,[212,249,250],{"class":243},"{\n",[212,252,254],{"class":214,"line":253},5,[212,255,256],{"class":243},"    ofstream ofs;\n",[212,258,260,263,266,269,272,275,278],{"class":214,"line":259},6,[212,261,262],{"class":243},"    ofs.",[212,264,265],{"class":239},"open",[212,267,268],{"class":243},"(",[212,270,271],{"class":222},"\"test.txt\"",[212,273,274],{"class":243},", ",[212,276,277],{"class":239},"ios",[212,279,280],{"class":243},"::out);\n",[212,282,284],{"class":214,"line":283},7,[212,285,230],{"emptyLinePlaceholder":229},[212,287,289,292,295,298,301],{"class":214,"line":288},8,[212,290,291],{"class":243},"    ofs ",[212,293,294],{"class":218},"\u003C\u003C",[212,296,297],{"class":222}," \"姓名：张三\"",[212,299,300],{"class":218}," \u003C\u003C",[212,302,303],{"class":243}," endl;\n",[212,305,307,309,311,314,316],{"class":214,"line":306},9,[212,308,291],{"class":243},[212,310,294],{"class":218},[212,312,313],{"class":222}," \"性别：男\"",[212,315,300],{"class":218},[212,317,303],{"class":243},[212,319,321,323,325,328,330],{"class":214,"line":320},10,[212,322,291],{"class":243},[212,324,294],{"class":218},[212,326,327],{"class":222}," \"年龄：18\"",[212,329,300],{"class":218},[212,331,303],{"class":243},[212,333,335],{"class":214,"line":334},11,[212,336,230],{"emptyLinePlaceholder":229},[212,338,340,342,345],{"class":214,"line":339},12,[212,341,262],{"class":243},[212,343,344],{"class":239},"close",[212,346,347],{"class":243},"();\n",[212,349,351],{"class":214,"line":350},13,[212,352,353],{"class":243},"}\n",[212,355,357],{"class":214,"line":356},14,[212,358,230],{"emptyLinePlaceholder":229},[212,360,362,365,368],{"class":214,"line":361},15,[212,363,364],{"class":218},"int",[212,366,367],{"class":239}," main",[212,369,370],{"class":243},"() {\n",[212,372,374],{"class":214,"line":373},16,[212,375,377],{"class":376},"sJ8bj","    \u002F\u002F 程序从 main 函数开始执行，下面的语句会按顺序运行。\n",[212,379,381],{"class":214,"line":380},17,[212,382,230],{"emptyLinePlaceholder":229},[212,384,386,389],{"class":214,"line":385},18,[212,387,388],{"class":239},"    test01",[212,390,347],{"class":243},[212,392,394],{"class":214,"line":393},19,[212,395,230],{"emptyLinePlaceholder":229},[212,397,399],{"class":214,"line":398},20,[212,400,230],{"emptyLinePlaceholder":229},[212,402,404],{"class":214,"line":403},21,[212,405,406],{"class":376},"    \u002F\u002F 返回 0 表示程序正常结束。\n",[212,408,410,413,417],{"class":214,"line":409},22,[212,411,412],{"class":218},"    return",[212,414,416],{"class":415},"sj4cs"," 0",[212,418,419],{"class":243},";\n",[212,421,423],{"class":214,"line":422},23,[212,424,353],{"class":243},[13,426,427,430,431,434],{},[20,428,429],{},"运行\u002F观察结果："," 运行后会在当前工作目录写入示例文件，可用 ",[194,432,433],{},"cat 文件名"," 查看写入内容。",[13,436,437],{},"总结：",[439,440,441,444,447,450,453],"ul",{},[33,442,443],{},"文件操作必须包含头文件 fstream",[33,445,446],{},"读文件可以利用 ofstream  ，或者fstream类",[33,448,449],{},"打开文件时候需要指定操作文件的路径，以及打开方式",[33,451,452],{},"利用\u003C\u003C可以向文件中写数据",[33,454,455],{},"操作完毕，要关闭文件",[71,457,458],{"id":458},"读文件",[13,460,461],{},"读文件与写文件步骤相似，但是读取方式相对于比较多",[13,463,464],{},"读文件步骤如下：",[30,466,467,471,476,482,488],{},[33,468,81,469,85],{},[83,470],{},[33,472,88,473,475],{},[83,474],{},"ifstream ifs;",[33,477,478,479,481],{},"打开文件并判断文件是否打开成功",[83,480],{},"ifs.open(\"文件路径\",打开方式);",[33,483,484,485,487],{},"读数据",[83,486],{},"四种方式读取",[33,489,106,490,492],{},[83,491],{},"ifs.close();",[13,494,495],{},[20,496,201],{},[203,498,500],{"className":205,"code":499,"language":207,"meta":208,"style":208},"#include \u003Cfstream>\n#include \u003Cstring>\nvoid test01()\n{\n    ifstream ifs;\n    ifs.open(\"test.txt\", ios::in);\n\n    if (!ifs.is_open())\n    {\n        cout \u003C\u003C \"文件打开失败\" \u003C\u003C endl;\n        return;\n    }\n\n    \u002F\u002F第一种方式\n    \u002F\u002Fchar buf[1024] = { 0 };\n    \u002F\u002Fwhile (ifs >> buf)\n    \u002F\u002F{\n    \u002F\u002F  cout \u003C\u003C buf \u003C\u003C endl;\n    \u002F\u002F}\n\n    \u002F\u002F第二种\n    \u002F\u002Fchar buf[1024] = { 0 };\n    \u002F\u002Fwhile (ifs.getline(buf,sizeof(buf)))\n    \u002F\u002F{\n    \u002F\u002F  cout \u003C\u003C buf \u003C\u003C endl;\n    \u002F\u002F}\n\n    \u002F\u002F第三种\n    \u002F\u002Fstring buf;\n    \u002F\u002Fwhile (getline(ifs, buf))\n    \u002F\u002F{\n    \u002F\u002F  cout \u003C\u003C buf \u003C\u003C endl;\n    \u002F\u002F}\n\n    char c;\n    while ((c = ifs.get()) != EOF)\n    {\n        cout \u003C\u003C c;\n    }\n\n    ifs.close();\n\n}\n\nint main() {\n\n    test01();\n\n\n    return 0;\n}\n",[194,501,502,508,515,523,527,532,550,554,574,579,593,600,605,609,614,619,624,629,634,639,643,648,652,657,662,667,672,677,683,689,695,700,705,710,715,724,751,756,765,770,775,784,789,794,799,808,813,820,825,830,839],{"__ignoreMap":208},[212,503,504,506],{"class":214,"line":215},[212,505,219],{"class":218},[212,507,223],{"class":222},[212,509,510,512],{"class":214,"line":226},[212,511,219],{"class":218},[212,513,514],{"class":222}," \u003Cstring>\n",[212,516,517,519,521],{"class":214,"line":233},[212,518,236],{"class":218},[212,520,240],{"class":239},[212,522,244],{"class":243},[212,524,525],{"class":214,"line":247},[212,526,250],{"class":243},[212,528,529],{"class":214,"line":253},[212,530,531],{"class":243},"    ifstream ifs;\n",[212,533,534,537,539,541,543,545,547],{"class":214,"line":259},[212,535,536],{"class":243},"    ifs.",[212,538,265],{"class":239},[212,540,268],{"class":243},[212,542,271],{"class":222},[212,544,274],{"class":243},[212,546,277],{"class":239},[212,548,549],{"class":243},"::in);\n",[212,551,552],{"class":214,"line":283},[212,553,230],{"emptyLinePlaceholder":229},[212,555,556,559,562,565,568,571],{"class":214,"line":288},[212,557,558],{"class":218},"    if",[212,560,561],{"class":243}," (",[212,563,564],{"class":218},"!",[212,566,567],{"class":243},"ifs.",[212,569,570],{"class":239},"is_open",[212,572,573],{"class":243},"())\n",[212,575,576],{"class":214,"line":306},[212,577,578],{"class":243},"    {\n",[212,580,581,584,586,589,591],{"class":214,"line":320},[212,582,583],{"class":243},"        cout ",[212,585,294],{"class":218},[212,587,588],{"class":222}," \"文件打开失败\"",[212,590,300],{"class":218},[212,592,303],{"class":243},[212,594,595,598],{"class":214,"line":334},[212,596,597],{"class":218},"        return",[212,599,419],{"class":243},[212,601,602],{"class":214,"line":339},[212,603,604],{"class":243},"    }\n",[212,606,607],{"class":214,"line":350},[212,608,230],{"emptyLinePlaceholder":229},[212,610,611],{"class":214,"line":356},[212,612,613],{"class":376},"    \u002F\u002F第一种方式\n",[212,615,616],{"class":214,"line":361},[212,617,618],{"class":376},"    \u002F\u002Fchar buf[1024] = { 0 };\n",[212,620,621],{"class":214,"line":373},[212,622,623],{"class":376},"    \u002F\u002Fwhile (ifs >> buf)\n",[212,625,626],{"class":214,"line":380},[212,627,628],{"class":376},"    \u002F\u002F{\n",[212,630,631],{"class":214,"line":385},[212,632,633],{"class":376},"    \u002F\u002F  cout \u003C\u003C buf \u003C\u003C endl;\n",[212,635,636],{"class":214,"line":393},[212,637,638],{"class":376},"    \u002F\u002F}\n",[212,640,641],{"class":214,"line":398},[212,642,230],{"emptyLinePlaceholder":229},[212,644,645],{"class":214,"line":403},[212,646,647],{"class":376},"    \u002F\u002F第二种\n",[212,649,650],{"class":214,"line":409},[212,651,618],{"class":376},[212,653,654],{"class":214,"line":422},[212,655,656],{"class":376},"    \u002F\u002Fwhile (ifs.getline(buf,sizeof(buf)))\n",[212,658,660],{"class":214,"line":659},24,[212,661,628],{"class":376},[212,663,665],{"class":214,"line":664},25,[212,666,633],{"class":376},[212,668,670],{"class":214,"line":669},26,[212,671,638],{"class":376},[212,673,675],{"class":214,"line":674},27,[212,676,230],{"emptyLinePlaceholder":229},[212,678,680],{"class":214,"line":679},28,[212,681,682],{"class":376},"    \u002F\u002F第三种\n",[212,684,686],{"class":214,"line":685},29,[212,687,688],{"class":376},"    \u002F\u002Fstring buf;\n",[212,690,692],{"class":214,"line":691},30,[212,693,694],{"class":376},"    \u002F\u002Fwhile (getline(ifs, buf))\n",[212,696,698],{"class":214,"line":697},31,[212,699,628],{"class":376},[212,701,703],{"class":214,"line":702},32,[212,704,633],{"class":376},[212,706,708],{"class":214,"line":707},33,[212,709,638],{"class":376},[212,711,713],{"class":214,"line":712},34,[212,714,230],{"emptyLinePlaceholder":229},[212,716,718,721],{"class":214,"line":717},35,[212,719,720],{"class":218},"    char",[212,722,723],{"class":243}," c;\n",[212,725,727,730,733,736,739,742,745,748],{"class":214,"line":726},36,[212,728,729],{"class":218},"    while",[212,731,732],{"class":243}," ((c ",[212,734,735],{"class":218},"=",[212,737,738],{"class":243}," ifs.",[212,740,741],{"class":239},"get",[212,743,744],{"class":243},"()) ",[212,746,747],{"class":218},"!=",[212,749,750],{"class":243}," EOF)\n",[212,752,754],{"class":214,"line":753},37,[212,755,578],{"class":243},[212,757,759,761,763],{"class":214,"line":758},38,[212,760,583],{"class":243},[212,762,294],{"class":218},[212,764,723],{"class":243},[212,766,768],{"class":214,"line":767},39,[212,769,604],{"class":243},[212,771,773],{"class":214,"line":772},40,[212,774,230],{"emptyLinePlaceholder":229},[212,776,778,780,782],{"class":214,"line":777},41,[212,779,536],{"class":243},[212,781,344],{"class":239},[212,783,347],{"class":243},[212,785,787],{"class":214,"line":786},42,[212,788,230],{"emptyLinePlaceholder":229},[212,790,792],{"class":214,"line":791},43,[212,793,353],{"class":243},[212,795,797],{"class":214,"line":796},44,[212,798,230],{"emptyLinePlaceholder":229},[212,800,802,804,806],{"class":214,"line":801},45,[212,803,364],{"class":218},[212,805,367],{"class":239},[212,807,370],{"class":243},[212,809,811],{"class":214,"line":810},46,[212,812,230],{"emptyLinePlaceholder":229},[212,814,816,818],{"class":214,"line":815},47,[212,817,388],{"class":239},[212,819,347],{"class":243},[212,821,823],{"class":214,"line":822},48,[212,824,230],{"emptyLinePlaceholder":229},[212,826,828],{"class":214,"line":827},49,[212,829,230],{"emptyLinePlaceholder":229},[212,831,833,835,837],{"class":214,"line":832},50,[212,834,412],{"class":218},[212,836,416],{"class":415},[212,838,419],{"class":243},[212,840,842],{"class":214,"line":841},51,[212,843,353],{"class":243},[13,845,846,848],{},[20,847,429],{}," 运行前需要当前工作目录存在对应示例文件，程序会按读取逻辑打印文件内容或读取结果。",[13,850,437],{},[439,852,853,856,859],{},[33,854,855],{},"读文件可以利用 ifstream  ，或者fstream类",[33,857,858],{},"利用is_open函数可以判断文件是否打开成功",[33,860,861],{},"close 关闭文件",[68,863,47],{"id":47},[13,865,866],{},"以二进制的方式对文件进行读写操作",[13,868,869],{},"打开方式要指定为 ==ios::binary==",[71,871,73],{"id":872},"写文件-1",[13,874,875],{},"二进制方式写文件主要利用流对象调用成员函数write",[13,877,878,879],{},"函数原型 ：",[194,880,881],{},"ostream& write(const char * buffer,int len);",[13,883,884],{},"参数解释：字符指针buffer指向内存中一段存储空间。len是读写的字节数",[13,886,887],{},[20,888,201],{},[203,890,892],{"className":205,"code":891,"language":207,"meta":208,"style":208},"#include \u003Cfstream>\n#include \u003Cstring>\n\nclass Person\n{\npublic:\n    char m_Name[64];\n    int m_Age;\n};\n\n\u002F\u002F二进制文件  写文件\nvoid test01()\n{\n    \u002F\u002F1、包含头文件\n\n    \u002F\u002F2、创建输出流对象\n    ofstream ofs(\"person.txt\", ios::out | ios::binary);\n    \n    \u002F\u002F3、打开文件\n    \u002F\u002Fofs.open(\"person.txt\", ios::out | ios::binary);\n\n    Person p = {\"张三\"  , 18};\n\n    \u002F\u002F4、写文件\n    ofs.write((const char *)&p, sizeof(p));\n\n    \u002F\u002F5、关闭文件\n    ofs.close();\n}\n\nint main() {\n\n    test01();\n\n\n    return 0;\n}\n",[194,893,894,900,906,910,918,922,927,940,948,953,957,962,970,974,979,983,988,1017,1022,1027,1032,1036,1057,1061,1066,1100,1104,1109,1117,1121,1125,1133,1137,1143,1147,1151,1159],{"__ignoreMap":208},[212,895,896,898],{"class":214,"line":215},[212,897,219],{"class":218},[212,899,223],{"class":222},[212,901,902,904],{"class":214,"line":226},[212,903,219],{"class":218},[212,905,514],{"class":222},[212,907,908],{"class":214,"line":233},[212,909,230],{"emptyLinePlaceholder":229},[212,911,912,915],{"class":214,"line":247},[212,913,914],{"class":218},"class",[212,916,917],{"class":239}," Person\n",[212,919,920],{"class":214,"line":253},[212,921,250],{"class":243},[212,923,924],{"class":214,"line":259},[212,925,926],{"class":218},"public:\n",[212,928,929,931,934,937],{"class":214,"line":283},[212,930,720],{"class":218},[212,932,933],{"class":243}," m_Name[",[212,935,936],{"class":415},"64",[212,938,939],{"class":243},"];\n",[212,941,942,945],{"class":214,"line":288},[212,943,944],{"class":218},"    int",[212,946,947],{"class":243}," m_Age;\n",[212,949,950],{"class":214,"line":306},[212,951,952],{"class":243},"};\n",[212,954,955],{"class":214,"line":320},[212,956,230],{"emptyLinePlaceholder":229},[212,958,959],{"class":214,"line":334},[212,960,961],{"class":376},"\u002F\u002F二进制文件  写文件\n",[212,963,964,966,968],{"class":214,"line":339},[212,965,236],{"class":218},[212,967,240],{"class":239},[212,969,244],{"class":243},[212,971,972],{"class":214,"line":350},[212,973,250],{"class":243},[212,975,976],{"class":214,"line":356},[212,977,978],{"class":376},"    \u002F\u002F1、包含头文件\n",[212,980,981],{"class":214,"line":361},[212,982,230],{"emptyLinePlaceholder":229},[212,984,985],{"class":214,"line":373},[212,986,987],{"class":376},"    \u002F\u002F2、创建输出流对象\n",[212,989,990,993,996,998,1001,1003,1005,1008,1011,1014],{"class":214,"line":380},[212,991,992],{"class":243},"    ofstream ",[212,994,995],{"class":239},"ofs",[212,997,268],{"class":243},[212,999,1000],{"class":222},"\"person.txt\"",[212,1002,274],{"class":243},[212,1004,277],{"class":239},[212,1006,1007],{"class":243},"::out ",[212,1009,1010],{"class":218},"|",[212,1012,1013],{"class":239}," ios",[212,1015,1016],{"class":243},"::binary);\n",[212,1018,1019],{"class":214,"line":385},[212,1020,1021],{"class":243},"    \n",[212,1023,1024],{"class":214,"line":393},[212,1025,1026],{"class":376},"    \u002F\u002F3、打开文件\n",[212,1028,1029],{"class":214,"line":398},[212,1030,1031],{"class":376},"    \u002F\u002Fofs.open(\"person.txt\", ios::out | ios::binary);\n",[212,1033,1034],{"class":214,"line":403},[212,1035,230],{"emptyLinePlaceholder":229},[212,1037,1038,1041,1043,1046,1049,1052,1055],{"class":214,"line":409},[212,1039,1040],{"class":243},"    Person p ",[212,1042,735],{"class":218},[212,1044,1045],{"class":243}," {",[212,1047,1048],{"class":222},"\"张三\"",[212,1050,1051],{"class":243},"  , ",[212,1053,1054],{"class":415},"18",[212,1056,952],{"class":243},[212,1058,1059],{"class":214,"line":422},[212,1060,230],{"emptyLinePlaceholder":229},[212,1062,1063],{"class":214,"line":659},[212,1064,1065],{"class":376},"    \u002F\u002F4、写文件\n",[212,1067,1068,1070,1073,1076,1079,1082,1085,1088,1091,1094,1097],{"class":214,"line":664},[212,1069,262],{"class":243},[212,1071,1072],{"class":239},"write",[212,1074,1075],{"class":243},"((",[212,1077,1078],{"class":218},"const",[212,1080,1081],{"class":218}," char",[212,1083,1084],{"class":218}," *",[212,1086,1087],{"class":243},")",[212,1089,1090],{"class":218},"&",[212,1092,1093],{"class":243},"p, ",[212,1095,1096],{"class":218},"sizeof",[212,1098,1099],{"class":243},"(p));\n",[212,1101,1102],{"class":214,"line":669},[212,1103,230],{"emptyLinePlaceholder":229},[212,1105,1106],{"class":214,"line":674},[212,1107,1108],{"class":376},"    \u002F\u002F5、关闭文件\n",[212,1110,1111,1113,1115],{"class":214,"line":679},[212,1112,262],{"class":243},[212,1114,344],{"class":239},[212,1116,347],{"class":243},[212,1118,1119],{"class":214,"line":685},[212,1120,353],{"class":243},[212,1122,1123],{"class":214,"line":691},[212,1124,230],{"emptyLinePlaceholder":229},[212,1126,1127,1129,1131],{"class":214,"line":697},[212,1128,364],{"class":218},[212,1130,367],{"class":239},[212,1132,370],{"class":243},[212,1134,1135],{"class":214,"line":702},[212,1136,230],{"emptyLinePlaceholder":229},[212,1138,1139,1141],{"class":214,"line":707},[212,1140,388],{"class":239},[212,1142,347],{"class":243},[212,1144,1145],{"class":214,"line":712},[212,1146,230],{"emptyLinePlaceholder":229},[212,1148,1149],{"class":214,"line":717},[212,1150,230],{"emptyLinePlaceholder":229},[212,1152,1153,1155,1157],{"class":214,"line":726},[212,1154,412],{"class":218},[212,1156,416],{"class":415},[212,1158,419],{"class":243},[212,1160,1161],{"class":214,"line":753},[212,1162,353],{"class":243},[13,1164,1165,430,1167,434],{},[20,1166,429],{},[194,1168,433],{},[13,1170,437],{},[439,1172,1173],{},[33,1174,1175],{},"文件输出流对象 可以通过write函数，以二进制方式写数据",[71,1177,458],{"id":1178},"读文件-1",[13,1180,1181],{},"二进制方式读文件主要利用流对象调用成员函数read",[13,1183,1184,1185],{},"函数原型：",[194,1186,1187],{},"istream& read(char *buffer,int len);",[13,1189,884],{},[13,1191,201],{},[203,1193,1195],{"className":205,"code":1194,"language":207,"meta":208,"style":208},"#include \u003Cfstream>\n#include \u003Cstring>\n\nclass Person\n{\npublic:\n    char m_Name[64];\n    int m_Age;\n};\n\nvoid test01()\n{\n    ifstream ifs(\"person.txt\", ios::in | ios::binary);\n    if (!ifs.is_open())\n    {\n        cout \u003C\u003C \"文件打开失败\" \u003C\u003C endl;\n    }\n\n    Person p;\n    ifs.read((char *)&p, sizeof(p));\n\n    cout \u003C\u003C \"姓名： \" \u003C\u003C p.m_Name \u003C\u003C \" 年龄： \" \u003C\u003C p.m_Age \u003C\u003C endl;\n}\n\nint main() {\n    \u002F\u002F 程序从 main 函数开始执行，下面的语句会按顺序运行。\n\n    test01();\n\n\n    \u002F\u002F 返回 0 表示程序正常结束。\n    return 0;\n}\n",[194,1196,1197,1203,1209,1213,1219,1223,1227,1237,1243,1247,1251,1259,1263,1288,1302,1306,1318,1322,1326,1331,1355,1359,1388,1392,1396,1404,1408,1412,1418,1422,1426,1430,1438],{"__ignoreMap":208},[212,1198,1199,1201],{"class":214,"line":215},[212,1200,219],{"class":218},[212,1202,223],{"class":222},[212,1204,1205,1207],{"class":214,"line":226},[212,1206,219],{"class":218},[212,1208,514],{"class":222},[212,1210,1211],{"class":214,"line":233},[212,1212,230],{"emptyLinePlaceholder":229},[212,1214,1215,1217],{"class":214,"line":247},[212,1216,914],{"class":218},[212,1218,917],{"class":239},[212,1220,1221],{"class":214,"line":253},[212,1222,250],{"class":243},[212,1224,1225],{"class":214,"line":259},[212,1226,926],{"class":218},[212,1228,1229,1231,1233,1235],{"class":214,"line":283},[212,1230,720],{"class":218},[212,1232,933],{"class":243},[212,1234,936],{"class":415},[212,1236,939],{"class":243},[212,1238,1239,1241],{"class":214,"line":288},[212,1240,944],{"class":218},[212,1242,947],{"class":243},[212,1244,1245],{"class":214,"line":306},[212,1246,952],{"class":243},[212,1248,1249],{"class":214,"line":320},[212,1250,230],{"emptyLinePlaceholder":229},[212,1252,1253,1255,1257],{"class":214,"line":334},[212,1254,236],{"class":218},[212,1256,240],{"class":239},[212,1258,244],{"class":243},[212,1260,1261],{"class":214,"line":339},[212,1262,250],{"class":243},[212,1264,1265,1268,1271,1273,1275,1277,1279,1282,1284,1286],{"class":214,"line":350},[212,1266,1267],{"class":243},"    ifstream ",[212,1269,1270],{"class":239},"ifs",[212,1272,268],{"class":243},[212,1274,1000],{"class":222},[212,1276,274],{"class":243},[212,1278,277],{"class":239},[212,1280,1281],{"class":243},"::in 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p;\n",[212,1332,1333,1335,1338,1340,1343,1345,1347,1349,1351,1353],{"class":214,"line":398},[212,1334,536],{"class":243},[212,1336,1337],{"class":239},"read",[212,1339,1075],{"class":243},[212,1341,1342],{"class":218},"char",[212,1344,1084],{"class":218},[212,1346,1087],{"class":243},[212,1348,1090],{"class":218},[212,1350,1093],{"class":243},[212,1352,1096],{"class":218},[212,1354,1099],{"class":243},[212,1356,1357],{"class":214,"line":403},[212,1358,230],{"emptyLinePlaceholder":229},[212,1360,1361,1364,1366,1369,1371,1374,1376,1379,1381,1384,1386],{"class":214,"line":409},[212,1362,1363],{"class":243},"    cout ",[212,1365,294],{"class":218},[212,1367,1368],{"class":222}," \"姓名： \"",[212,1370,300],{"class":218},[212,1372,1373],{"class":243}," p.m_Name ",[212,1375,294],{"class":218},[212,1377,1378],{"class":222}," \" 年龄： \"",[212,1380,300],{"class":218},[212,1382,1383],{"class":243}," p.m_Age 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