{"id":477,"date":"2020-08-08T17:30:55","date_gmt":"2020-08-08T09:30:55","guid":{"rendered":"http:\/\/www.wangkaixuan.tech\/?p=477"},"modified":"2020-08-09T12:07:09","modified_gmt":"2020-08-09T04:07:09","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88669%e5%8f%98%e6%88%90%e4%ba%86413","status":"publish","type":"post","link":"http:\/\/www.wangkaixuan.tech\/?p=477","title":{"rendered":"669\u4e3a\u4ec0\u4e48\u53d8\u6210\u4e86413"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">1.\u73b0\u8c61<\/h2>\n\n\n\n<p>\u8fd9\u662f\u4e00\u4e2a\u5728\u5b9e\u9645\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u53d1\u73b0\u7684\u95ee\u9898\uff1a\u6211\u4eec\u4ece\u5e73\u53f0A\u4f20\u4e86\u4e00\u4e2a\u6570\u5b57669\uff0c\u5230\u5e73\u53f0B\u4e0a\u540e\uff0c\u53d8\u6210\u4e86413\u3002<\/p>\n\n\n\n<p>\u540e\u6765\u53d1\u73b0\u6570\u5b57\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u5e76\u6ca1\u6709\u53d8\u5316\uff0c\u53ea\u4e0d\u8fc7\u89e3\u6790\u7684\u65f6\u5019\u51fa\u4e86\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u7b80\u5316\u8868\u8ff0\uff0c\u6211\u4eec\u5199\u4e86\u4e00\u4e2a\u793a\u4f8b\u7a0b\u5e8f\u6765\u6a21\u62df\u5b9e\u9645\u573a\u666f\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;string.h>\n#include &lt;stdlib.h>\n#include &lt;stdio.h>\n\nint main(int argc, char** argv)\n{\n\tunsigned short send_num = 669; \/\/ \u8981\u53d1\u9001\u7684\u6570\u5b57\n\n\tchar send_buf&#91;2]; \/\/ \u53d1\u9001\u7f13\u51b2\u533a\uff0c2\u5b57\u8282\n\n\t\/\/\u6309\u7167\u5927\u7aef\u5e8f\u5199\u5165\u53d1\u9001\u7f13\u51b2\u533a\n\tsend_buf&#91;0] = (char)(send_num >> 8);\n\tsend_buf&#91;1] = (char)send_num;\n\n\t\/\/\u53d1\u9001\u5230\u5ba2\u6237\u7aef\n\t\/\/...\n\n\t\/\/\u5ba2\u6237\u7aef\u6536\u5230\n\tchar recv_buf&#91;2];\n\tmemcpy(recv_buf, send_buf, 2);\n\n\t\/\/\u9519\u8bef\u7684\u63a5\u6536\u65b9\u5f0f\n\tunsigned short recv_num = (recv_buf&#91;0] &lt;&lt; 8) + recv_buf&#91;1];\n\tprintf(\"send_num = %u\\n\", send_num);\n\tprintf(\"recv_num = %u\\n\", recv_num);\n\n\treturn 0;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"212\" height=\"40\" src=\"http:\/\/www.wangkaixuan.tech\/wp-content\/uploads\/2020\/08\/image-14.png\" alt=\"\" class=\"wp-image-481\"\/><\/figure>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230669\u53d8\u6210\u4e86413\uff0c\u8fd9\u5c31\u662f\u6211\u4eec\u9047\u5230\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u63a2\u7a76<\/h2>\n\n\n\n<p>1\uff09\u662f\u53d1\u9001\u7684\u65f6\u5019\u5199\u9519\u4e86\u4e48\uff1f<\/p>\n\n\n\n<p>669\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"333\" height=\"344\" src=\"http:\/\/www.wangkaixuan.tech\/wp-content\/uploads\/2020\/08\/image-15.png\" alt=\"\" class=\"wp-image-482\"\/><\/figure>\n\n\n\n<p>\u5373\uff1a<strong>00000010 10011101<\/strong><\/p>\n\n\n\n<p>\u6211\u4eec\u7528\u4e0b\u5217\u4ee3\u7801\u628a\u7f13\u51b2\u533a\u4e2d\u5b9e\u9645\u7684\u4e8c\u8fdb\u5236\u6570\u503c\u6253\u5370\u51fa\u6765\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;string.h>\n#include &lt;stdlib.h>\n#include &lt;stdio.h>\n\n\/\/\u628achar\u4e2d\u7684\u6574\u6570(0~255)\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u5b58\u653e\u5728\u4e00\u4e2along\u4e2d\uff0c\u53ef\u4ee5\u7528%08ld\u6253\u5370\u51fa\u6765\nlong bin_by_int(unsigned char chr_num)\n{\n\tunsigned char mask = 0x80; \/\/ 1000 0000\n\tlong ret = 0;\n\n\tfor (int i = 0; i &lt; 8; ++i)\n\t{\n\t\tret *= 10;\n\t\tif (chr_num &amp; mask)\n\t\t\tret += 1;\n\t\tchr_num = chr_num &lt;&lt; 1;\n\t}\n\t\n\treturn ret;\n}\n\nint main(int argc, char** argv)\n{\n\tunsigned short send_num = 669; \/\/ \u8981\u53d1\u9001\u7684\u6570\u5b57\n\n\tchar send_buf&#91;2]; \/\/ \u53d1\u9001\u7f13\u51b2\u533a\uff0c2\u5b57\u8282\n\n\t\/\/\u6309\u7167\u5927\u7aef\u5e8f\u5199\u5165\u53d1\u9001\u7f13\u51b2\u533a\n\tsend_buf&#91;0] = (char)(send_num >> 8);\n\tsend_buf&#91;1] = (char)send_num;\n\n\t\/\/\u53d1\u9001\u5230\u5ba2\u6237\u7aef\n\t\/\/...\n\n\t\/\/\u5ba2\u6237\u7aef\u6536\u5230\n\tchar recv_buf&#91;2];\n\tmemcpy(recv_buf, send_buf, 2);\n\n\t\/\/\u9519\u8bef\u7684\u63a5\u6536\u65b9\u5f0f\n\tunsigned short recv_num = (recv_buf&#91;0] &lt;&lt; 8) + recv_buf&#91;1];\n\tprintf(\"send_num = %u\\n\", send_num);\n\tprintf(\"send_buf = %08ld %08ld\\n\", bin_by_int(send_buf&#91;0]), bin_by_int(send_buf&#91;1]));\n\t\n\tprintf(\"recv_num = %u\\n\", recv_num);\n\tprintf(\"recv_buf = %08ld %08ld\\n\", bin_by_int(recv_buf&#91;0]), bin_by_int(recv_buf&#91;1]));\n\n\treturn 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"252\" height=\"65\" src=\"http:\/\/www.wangkaixuan.tech\/wp-content\/uploads\/2020\/08\/image-16.png\" alt=\"\" class=\"wp-image-483\"\/><\/figure>\n\n\n\n<p>\u6211\u4eec\u53d1\u73b0\u7f13\u51b2\u533a\u4e2d\u7684\u4e8c\u8fdb\u5236\u5176\u5b9e\u662f\u5bf9\u7684\uff0c\u90a3\u4e48\u95ee\u9898\u53ea\u53ef\u80fd\u51fa\u5728\u4e86\u89e3\u6790\u4e0a\u3002<\/p>\n\n\n\n<p>2)\u4e3a\u4ec0\u4e48<strong>00000010 10011101<\/strong>\u4f1a\u88ab\u89e3\u91ca\u6210413\u5462\uff1f<\/p>\n\n\n\n<p>\u6211\u4eec\u628a413\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u6253\u5370\u51fa\u6765\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"339\" height=\"277\" src=\"http:\/\/www.wangkaixuan.tech\/wp-content\/uploads\/2020\/08\/image-17.png\" alt=\"\" class=\"wp-image-484\"\/><\/figure>\n\n\n\n<p>\u8fd9\u4e24\u4e2a\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u8fd8\u633a\u76f8\u4f3c\u7684\uff1a<\/p>\n\n\n\n<p>669 : <strong>00000010 10011101<\/strong><\/p>\n\n\n\n<p>413 : <strong>00000001 10011101<\/strong><\/p>\n\n\n\n<p>\u4e4d\u4e00\u770b\uff0c\u6211\u4eec\u5f88\u81ea\u7136\u5730\u8ba4\u4e3a\u662f\u524d\u9762\u90a3\u4e2a\u5b57\u8282\u89e3\u91ca\u9519\u4e86\uff0c\u5e94\u8be5\u662f00000010\u800c\u4e0d\u662f00000001\u3002\u4f46\u662f\u4ed4\u7ec6\u4e00\u60f3\u4e0d\u5e94\u8be5\u554a\uff0c\u8fdb\u884c\u4f4d\u79fb\u7684\u65f6\u5019\u5c31\u5e94\u8be5\u79fb8\u4f4d\uff0c\u6240\u4ee5\u4e0d\u5e94\u8be5\u9519\u7684\u3002<\/p>\n\n\n\n<p>\u8fd9\u65f6\u5019\u540e\u9762\u8fd9\u4e2a\u4e8c\u8fdb\u5236\u4e32\u5f15\u8d77\u4e86\u6211\u4eec\u7684\u6ce8\u610f\u30021\u901a\u5e38\u662f\u7b26\u53f7\u4f4d\uff0c\u96be\u4e0d\u6210\u662f\u88ab\u89e3\u91ca\u6210\u8d1f\u6570\u4e86\uff1f<\/p>\n\n\n\n<p>\u56de\u5fc6\u4e0b\u5927\u5b66\u65f6\u5019\u7684\u77e5\u8bc6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u6b63\u6570\u7b26\u53f7\u4f4d\u662f0\uff0c\u6570\u503c\u90e8\u5206\u7528\u539f\u7801\u8868\u793a\uff1b<\/li><li>\u8d1f\u6570\u7b26\u53f7\u4f4d\u662f1\uff0c\u6570\u503c\u90e8\u5206\u7528<strong>\u8865\u7801<\/strong>\u8868\u793a\uff0c\u5373<strong>\u9664\u7b26\u53f7\u4f4d\u53d6\u53cd\u518d\u52a01<\/strong>\u3002<\/li><\/ul>\n\n\n\n<p>\u90a3\u4e4810011101\u4ee3\u8868\u7684\u6570\u503c\u5176\u5b9e\u662f\u8d1f\u76840011101\u51cf1\u518d\u53d6\u53cd\uff0c\u5373\u8d1f\u76841100011\uff0c\u5373-99\u3002<\/p>\n\n\n\n<p>\u524d\u4e00\u4e2a\u5b57\u8282\u4ee3\u8868\u7684\u6570\u662f2\uff0c\u6839\u636e\u7b97\u5f0f\uff0crecv_num\u7684\u503c\uff0c\u5176\u5b9e\u662f2&lt;&lt;8 &#8211; 99\uff0c\u5373512-99\uff0c\u5373413\u3002\u89e3\u91ca\u901a\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u4fee\u8ba2<\/h2>\n\n\n\n<p> \u6839\u636e\u4e0a\u9762\u7684\u5206\u6790\uff0c \u6211\u4eec\u5176\u5b9e\u662f\u9519\u628a<strong>recv_buf[1]<\/strong>\u4e2d\u7684\u6570\u503c\u89e3\u91ca\u6210\u4e86\u8d1f\u6570\u4e86\u3002\u539f\u56e0\u5c31\u662f\u6211\u4eec\u5b9a\u4e49\u7684recv_buf\u7c7b\u578b\u662fchar\u800c\u4e0d\u662funsigned char\uff0c\u56e0\u6b64\u8ba1\u7b97\u7684\u65f6\u5019\uff0crecv_buf\u88ab<strong>\u9690\u5f0f\u8f6c\u6362\u4e3a\u4e86\u6709\u7b26\u53f7\u6574\u578b\u800c\u4e0d\u662f\u65e0\u7b26\u53f7\u6574\u578b<\/strong>\u3002<\/p>\n\n\n\n<p>\u89e3\u51b3\u65b9\u6cd5\u4e5f\u975e\u5e38\u7b80\u5355\uff0c\u628a<strong>recv_buf\u5b9a\u4e49\u4e3aunsigned char\u6570\u7ec4<\/strong>\u5373\u53ef\uff0c\u8fd9\u6837\u9690\u5f0f\u8f6c\u6362\u7684\u65f6\u5019\u5c31\u4e0d\u4f1a\u522b\u89e3\u91ca\u6210\u8d1f\u503c\u4e86\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;string.h>\n#include &lt;stdlib.h>\n#include &lt;stdio.h>\n\n\/\/\u628achar\u4e2d\u7684\u6574\u6570(0~255)\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u5b58\u653e\u5728\u4e00\u4e2along\u4e2d\uff0c\u53ef\u4ee5\u7528%08ld\u6253\u5370\u51fa\u6765\nlong bin_by_int(unsigned char chr_num)\n{\n\tunsigned char mask = 0x80; \/\/ 1000 0000\n\tlong ret = 0;\n\n\tfor (int i = 0; i &lt; 8; ++i)\n\t{\n\t\tret *= 10;\n\t\tif (chr_num &amp; mask)\n\t\t\tret += 1;\n\t\tchr_num = chr_num &lt;&lt; 1;\n\t}\n\t\n\treturn ret;\n}\n\nint main(int argc, char** argv)\n{\n\tunsigned short send_num = 669; \/\/ \u8981\u53d1\u9001\u7684\u6570\u5b57\n\n\tchar send_buf&#91;2]; \/\/ \u53d1\u9001\u7f13\u51b2\u533a\uff0c2\u5b57\u8282\n\n\t\/\/\u6309\u7167\u5927\u7aef\u5e8f\u5199\u5165\u53d1\u9001\u7f13\u51b2\u533a\n\tsend_buf&#91;0] = (char)(send_num >> 8);\n\tsend_buf&#91;1] = (char)send_num;\n\n\t\/\/\u53d1\u9001\u5230\u5ba2\u6237\u7aef\n\t\/\/...\n\n\t\/\/\u5ba2\u6237\u7aef\u6536\u5230\n\tunsigned char recv_buf&#91;2];\n\tmemcpy(recv_buf, send_buf, 2);\n\n\t\/\/\u9519\u8bef\u7684\u63a5\u6536\u65b9\u5f0f\n\tunsigned short recv_num = (recv_buf&#91;0] &lt;&lt; 8) + recv_buf&#91;1];\n\tprintf(\"send_num = %u\\n\", send_num);\n\tprintf(\"send_buf = %08ld %08ld\\n\", bin_by_int(send_buf&#91;0]), bin_by_int(send_buf&#91;1]));\n\t\n\tprintf(\"recv_num = %u\\n\", recv_num);\n\tprintf(\"recv_buf = %08ld %08ld\\n\", bin_by_int(recv_buf&#91;0]), bin_by_int(recv_buf&#91;1]));\n\n\treturn 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"306\" height=\"75\" src=\"http:\/\/www.wangkaixuan.tech\/wp-content\/uploads\/2020\/08\/image-18.png\" alt=\"\" class=\"wp-image-485\"\/><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u73b0\u8c61 \u8fd9\u662f\u4e00\u4e2a\u5728\u5b9e\u9645\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u53d1\u73b0\u7684\u95ee\u9898\uff1a\u6211\u4eec\u4ece\u5e73\u53f0A\u4f20\u4e86\u4e00\u4e2a\u6570\u5b57669\uff0c\u5230\u5e73\u53f0B\u4e0a\u540e\uff0c\u53d8\u6210\u4e86413\u3002 \u540e\u6765\u53d1\u73b0\u6570\u5b57\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u5e76\u6ca1\u6709\u53d8\u5316\uff0c\u53ea\u4e0d\u8fc7\u89e3\u6790\u7684\u65f6\u5019&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"http:\/\/www.wangkaixuan.tech\/?p=477\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-477","post","type-post","status-publish","format-standard","hentry","category-05-01-"],"_links":{"self":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=477"}],"version-history":[{"count":0,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/477\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=477"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}