{"id":217488,"date":"2020-12-04T23:30:34","date_gmt":"2020-12-04T15:30:34","guid":{"rendered":"http:\/\/4563.org\/?p=217488"},"modified":"2020-12-04T23:30:34","modified_gmt":"2020-12-04T15:30:34","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-64-%e4%bd%8d%e7%a8%8b%e5%ba%8f%e6%89%a7%e8%a1%8c%e5%90%8c%e6%a0%b7%e7%9a%84%e4%bb%a3%e7%a0%81%ef%bc%8c%e6%af%94-32-%e4%bd%8d%e7%a8%8b%e5%ba%8f%e5%8d%a0%e7%94%a8%e7%9a%84","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=217488","title":{"rendered":"\u4e3a\u4ec0\u4e48 64 \u4f4d\u7a0b\u5e8f\u6267\u884c\u540c\u6837\u7684\u4ee3\u7801\uff0c\u6bd4 32 \u4f4d\u7a0b\u5e8f\u5360\u7528\u7684\u5185\u5b58\u8981\u591a\uff08\u81ea\u5df1\u6d4b\u8bd5\u5c06\u8fd1\u4e00\u534a\uff09\uff1f"},"content":{"rendered":"
\n
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\u4e3a\u4ec0\u4e48 64 \u4f4d\u7a0b\u5e8f\u6267\u884c\u540c\u6837\u7684\u4ee3\u7801\uff0c\u6bd4 32 \u4f4d\u7a0b\u5e8f\u5360\u7528\u7684\u5185\u5b58\u8981\u591a\uff08\u81ea\u5df1\u6d4b\u8bd5\u5c06\u8fd1\u4e00\u534a\uff09\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : youla <\/span> <\/i> 2<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n
\/\/\u6d4b\u8bd5\u7528\u5230\u7684\u4ee3\u7801  Task.Factory.StartNew(() =>{  for (int i = 0; i < 999999; i++){   int len = 255;   IntPtr ptr = Marshal.AllocHGlobal(len);   QueryFullProcessImageName(-1, 0, ptr, ref len);   Console.WriteLine(Marshal.PtrToStringUni(ptr));   Marshal.FreeHGlobal(ptr);  } });  <\/code><\/pre>\n
\"\u4e3a\u4ec0\u4e48<\/p>\n
\u95e8\u5916\u6c49<\/h1>\n
 <\/p>\n
\u5750\u7b49\u6478\u9c7c\u5927\u4f6c<\/h1>\n
  <\/div>\n
<\/p>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (22<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : longaiwp <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u96be\u9053\u4e0d\u662f\u610f\u6599\u4e4b\u4e2d\u7684\u4e8b\u60c5\u5417\uff1f\u4f60\u7684\u95ee\u9898\u662f\u4e3a\u4ec0\u4e48\u4f1a\u589e\u52a0\u8fd8\u662f\u4e3a\u4ec0\u4e48\u4f1a\u589e\u52a0\u4e00\u534a\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : 0x2CA <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 32 \u4f4d\u7f16\u8bd1\u5668\uff1a<\/p>\n
     char\uff1a1 \u4e2a\u5b57\u8282
     char*\uff08\u5373\u6307\u9488\u53d8\u91cf\uff09: 4 \u4e2a\u5b57\u8282\uff08 32 \u4f4d\u7684\u5bfb\u5740\u7a7a\u95f4\u662f 2^32, \u5373 32 \u4e2a bit\uff0c\u4e5f\u5c31\u662f 4 \u4e2a\u5b57\u8282\u3002\u540c\u7406 64 \u4f4d\u7f16\u8bd1\u5668\uff09
     short int : 2 \u4e2a\u5b57\u8282
     int\uff1a 4 \u4e2a\u5b57\u8282
     unsigned int : 4 \u4e2a\u5b57\u8282
     float: 4 \u4e2a\u5b57\u8282
     double: 8 \u4e2a\u5b57\u8282
     long: 4 \u4e2a\u5b57\u8282
     long long: 8 \u4e2a\u5b57\u8282
     unsigned long: 4 \u4e2a\u5b57\u8282<\/p>\n
     64 \u4f4d\u7f16\u8bd1\u5668\uff1a<\/p>\n
     char\uff1a1 \u4e2a\u5b57\u8282
     char*(\u5373\u6307\u9488\u53d8\u91cf): 8 \u4e2a\u5b57\u8282
     short int : 2 \u4e2a\u5b57\u8282
     int\uff1a 4 \u4e2a\u5b57\u8282
     unsigned int : 4 \u4e2a\u5b57\u8282
     float: 4 \u4e2a\u5b57\u8282
     double: 8 \u4e2a\u5b57\u8282
     long: 8 \u4e2a\u5b57\u8282
     long long: 8 \u4e2a\u5b57\u8282
     unsigned long: 8 \u4e2a\u5b57\u8282                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : shawndev <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u76f8\u540c\u7684\u6570\u636e\u7c7b\u578b\u4f1a\u5360\u7528\u66f4\u591a\u7684\u5185\u5b58\u7a7a\u95f4                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Jooooooooo <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u539f\u6765\u7528 \u5317\u4eac\u5e02-\u671d\u9633\u533a \u5b9a\u4f4d\u4eba<\/p>\n
    \u73b0\u5728\u7528 \u4e2d\u56fd-\u5317\u4eac\u5e02-\u671d\u9633\u533a-\u671b\u4eac \u5b9a\u4f4d\u4eba<\/p>\n
    \u5199\u51fa\u6765\u5360\u7a7a\u95f4\u66f4\u5927\u4e86\u5427                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : youla <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5982\u679c\u53ef\u4ee5\u8fd8\u60f3\u95ee\u4e00\u4e0b\uff0c\u4e0a\u9762\u7684\u4ee3\u7801\u5199\u7684\u6709\u95ee\u9898\u6ca1\uff1f\uff1f\u548c\u4e0b\u9762\u8fd9\u6837\u5199\u54ea\u4e2a\u597d\u70b9\uff1f\uff1f\uff1f<\/p>\n
     int len = 255;
     char[] data=new char[len];
     QueryFullProcessImageName(-1, 0, data, ref len);
     Console.WriteLine(new string(data,0,data.Length).TrimEnd(‘\u0000’));                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : codehz <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u663e\u7136\u6307\u9488\u7684\u5927\u5c0f\u7684\u53d8\u5316\u4e0d\u81f3\u4e8e\u5bfc\u81f4 heap alloc \u7684\u5927\u5c0f\u540c\u6bd4\u4f8b\u589e\u52a0\uff0c\u8fd9\u91cc\u7684\u539f\u56e0\u662f x64 \u672c\u8eab\u8fd0\u884c\u65f6\u73af\u5883\u81ea\u5e26\u7684 overhead\uff0c\u4e0d\u8fc7\u4e0d\u7528\u62c5\u5fc3\uff0c\u5f88\u5927\u4e00\u90e8\u5206\u90fd\u662f\u7531\u4e8e\u8c03\u8bd5\u9700\u8981\u624d\u9020\u6210\u7684\uff0crelease \u7248\u672c\u4e0d\u4f1a\u76f8\u5dee\u5f88\u591a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : jasonkayzk <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 x86 \u548c x64 \u7684\u6307\u9488\u5927\u5c0f\u90fd\u662f\u4e0d\u4e00\u6837\u7684\uff1b                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : jojojo <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6307\u9488\u5927\u5c0f\u4e0d\u4e00\u81f4\uff0c\u57fa\u7840\u6570\u636e\u7c7b\u578b\u6bd4\u5982 int \u5728\u4e24\u4e2a\u5e73\u53f0\u4e0a\u5927\u5c0f\u4e0d\u4e00\u81f4\uff0c\u53e6\u5916\u6211\u6bd4\u8f83\u597d\u5947\uff0c\u5982\u679c\u662f\u50cf go \u90a3\u79cd\uff0c\u5168\u90e8\u662f\u4ec0\u4e48 int32 \u8fd9\u79cd\u7684\u8bdd\u3002\u5927\u5c0f\u4f1a\u662f\u4ec0\u4e48\u53d8\u5316                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ysc3839 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @youla C# \u6211\u4e0d\u719f\u6089\uff0c\u4f46\u662f C++ \u7684\u8bdd\u662f\u4f1a\u907f\u514d\u81ea\u5df1 new \u4e4b\u540e\u518d\u62f7\u8d1d\u7684\uff0c\u6bd4\u5982\u8981\u628a\u7ed3\u679c\u4fdd\u5b58\u5230 std::string \u4e2d\u7684\u8bdd\uff0c\u4f1a\u76f4\u63a5 string.resize() \u5206\u914d\u7a7a\u95f4\uff0c\u7136\u540e\u7528 string.data() \u83b7\u53d6\u6570\u636e\u6307\u9488\uff0c\u7136\u540e\u76f4\u63a5\u5199\u8fdb\u53bb\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lxilu <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u76f4\u63a5 String\/Builder \u5c31\u884c
    @0x2CA \u770b\u6e05\u695a\u554a\uff0c\u8fd9\u662f C#\uff0c\u7b80\u5355\u7c7b\u578b\u5c3a\u5bf8\u56fa\u5b9a\uff0c\u6307\u9488\u968f\u5e73\u53f0\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : f6x <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u786c\u76d8++, \u5185\u5b58+
    \u8017\u65f6-<\/p>\n
    \u4f60\u9009\u5427.                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Jasmine2016 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u8981\u4ece\u8ba1\u7b97\u673a\u539f\u7406\u8bf4\u8d77\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : qinyusen <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u53bb\u5e74\u7ed9\u6821\u62db\u51fa\u7684\u9898\u76ee\u5c31\u662f\u8003\u5bdf\u8fd9\u4e2a\u7684\u3002\u3002\u3002\u4f9b\u53c2\u8003
    \u586b\u7a7a\u9898\u548c\u7b80\u7b54\u9898
    1.\u5bf9\u4e8e 32 \u4f4d\u7cfb\u7edf sizeof(int) \u7684\u503c\u7b49\u4e8e`__________`<\/p>\n
    5 \u5728\u4e00\u4e2a 64 \u4f4d\u6216 32 \u64cd\u4f5c\u7cfb\u7edf\u4e2d\u4ee5\u4e0b\u4ee3\u7801\u8f93\u51fa\u7684\u7ed3\u679c\u662f\uff08\u591a\u9009\uff09\uff1f
    “`
    std::cout<<sizeof(NULL)<<sizeof(“NULL”)<<std::endl;
    “`
    A 88
    B 85
    C 44
    D 45<\/p>\n
    7. \u5199\u51fa\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
     \/\/ test1 
     char str[] = “world”;
     cout << sizeof(str) << “: “;
     char *p = str;
     cout << sizeof(p) << “: “;
     char i = 10;
     cout << sizeof(i) << “: “;
     void *pp = malloc(10);
     cout << sizeof(pp) << endl;<\/p>\n
    `__________`                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : dream4ever <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u522b\u7684\u4e0d\u8bf4\uff0c\u8fd9\u589e\u52a0\u7684\u662f\u4e00\u500d\u5427\uff1f\u4e0d\u662f\u4e00\u534a\u5427\uff1f 10 * 200% = 20\uff0c\u800c\u4e0d\u662f 10 * 150% = 20                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ragnaroks <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4e2a\u6d4b\u8bd5\u4e0d\u59a5\u5f53\uff0c\u6211\u6709\u4e2a dotnet core \u7684\u63a7\u5236\u53f0\u5e94\u7528\u7a0b\u5e8f\uff0c32 \u4f4d\u4e0b 17M \u5185\u5b58\uff0c64 \u4f4d\u4e0b 21M\uff0c\u4e2a\u4eba\u7406\u89e3\u4e5f\u5c31\u6307\u9488\u5360\u7528\u591a\u4e86\u70b9\uff0c\u5176\u5b83\u5e94\u8be5\u5b8c\u5168\u76f8\u540c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : nuk <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6ca1\u770b\u51fa\u6765\u8fd9\u6837\u6d4b\u8bd5\u6709\u5565\u610f\u4e49\uff0c\u90fd\u6ca1\u5206\u914d\u591a\u5c11\u5185\u5b58\uff0c\u5dee\u7684\u5c31\u662f\u8fd0\u884c\u65f6\u7528\u7684\u5185\u5b58\u5427\uff0c\u8d77\u7801 GC \u91cc\u4fdd\u5b58\u7684\u90fd\u662f 64 \u4f4d\u7684\u5730\u5740\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : ysc3839 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @qinyusen \u8fd9\u7b2c\u4e94\u9898\u6709\u95ee\u9898\u5427\uff1f NULL \u5177\u4f53\u5b9e\u73b0\u662f\u770b\u7f16\u8bd1\u5668\u7684\uff0c\u6709\u7684\u7f16\u8bd1\u5668\u5c31\u53ea\u662f\u4e00\u4e2a 0\uff0c\u6b64\u65f6\u7c7b\u578b\u662f int\uff0c\u957f\u5ea6\u4e3a 4 \u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : dadachen1997 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u56e0\u4e3a\u6307\u9488\u7684\u957f\u5ea6 double \u4e86\uff0c\u5728\u73b0\u4ee3\u7684\u8bed\u8a00\u91cc\u9762\uff0c\u6bcf\u4e2a object \u7684 header \u5305\u542b\u7684\u6307\u9488\u592a\u591a\u4e86\uff0c\u57fa\u672c\u4e0a 32 \u5230 64 \u7a7a\u95f4\u5360\u7528\u4f1a\u591a 80%                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : XDy0 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u7ecf\u5178\u9762\u8bd5\u9898\u3002\u3002\u6307\u9488\u538b\u7f29\u3002\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : qinyusen <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @ysc3839 \u5bf9\uff0c\u4f46\u662f\u9009\u62e9\u9898\uff0c\u4e0d\u662f\u586b\u7a7a\uff0c\u6240\u4ee5\uff0c\u53ea\u8981\u77e5\u9053\u8bf4\u7684\u662f\u5565\u5c31\u884c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : youla <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @ysc3839 \u8c22\u8c22\uff0c\u6211\u597d\u50cf\u5ffd\u7136\u611f\u53d7\u5230\u4e00\u70b9\u533a\u522b\u4e86\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : muzuiget <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5185\u5b58\u5730\u5740\u957f\u5ea6\u4e5f\u662f 64 \u4f4d\u554a\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
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