{"id":42469,"date":"2023-12-11T14:56:40","date_gmt":"2023-12-11T06:56:40","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=42469"},"modified":"2023-12-11T14:56:40","modified_gmt":"2023-12-11T06:56:40","slug":"sprintfstrcpymemcpy%e4%bd%bf%e7%94%a8%e4%b8%8a%e6%9c%89%e4%bb%80%e4%b9%88%e8%a6%81%e6%b3%a8%e6%84%8f%e7%9a%84%e5%9c%b0%e6%96%b9","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/sprintfstrcpymemcpy%e4%bd%bf%e7%94%a8%e4%b8%8a%e6%9c%89%e4%bb%80%e4%b9%88%e8%a6%81%e6%b3%a8%e6%84%8f%e7%9a%84%e5%9c%b0%e6%96%b9\/","title":{"rendered":"sprintf,strcpy,memcpy\u4f7f\u7528\u4e0a\u6709\u4ec0\u4e48\u8981\u6ce8\u610f\u7684\u5730\u65b9 ?"},"content":{"rendered":"<p>&#8220;`&#8221;                      strcpy\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u62f7\u8d1d\u7684\u51fd\u6570\uff0c\u5b83\u7684\u51fd\u6570\u539f\u578b\u4e3astrcpy(char <em>dst, c<strong><\/em><\/strong>t char *src);<\/p>\n<p>\u5c06 src\u5f00\u59cb\u7684\u4e00\u6bb5\u5b57\u7b26\u4e32\u62f7\u8d1d\u5230dst\u5f00\u59cb\u7684\u5185\u5b58\u4e2d\u53bb\uff0c\u7ed3\u675f\u7684\u6807\u5fd7\u7b26\u53f7\u4e3a&#039;\\0&#039;\uff0c\u7531\u4e8e\u62f7\u8d1d\u7684\u957f\u5ea6\u4e0d\u662f\u7531\u6211\u4eec\u81ea\u5df1\u63a7\u5236\u7684\uff0c\u6240\u4ee5\u8fd9\u4e2a\u5b57\u7b26\u4e32\u62f7\u8d1d\u5f88\u5bb9\u6613\u51fa\u9519\u3002\u5177\u5907\u5b57\u7b26\u4e32\u62f7\u8d1d\u529f\u80fd\u7684\u51fd\u6570\u6709memcpy\uff0c\u8fd9\u662f\u4e00\u4e2a\u5185\u5b58\u62f7\u8d1d\u51fd\u6570\uff0c\u5b83\u7684\u51fd\u6570\u539f\u578b\u4e3amemcpy(char  &lt;em&gt;dst, c&lt;strong&gt;*&lt;\/strong&gt;t char&lt;\/em&gt; src, unsigned int len);<\/p>\n<p>\u5c06\u957f\u5ea6\u4e3alen\u7684\u4e00\u6bb5\u5185\u5b58\uff0c\u4ecesrc\u62f7\u8d1d\u5230dst\u4e2d\u53bb\uff0c\u8fd9\u4e2a\u51fd\u6570\u7684\u957f\u5ea6\u53ef\u63a7\u3002\u4f46\u662f\u4f1a\u6709\u5185\u5b58\u53e0\u52a0\u7684\u95ee\u9898\u3002<\/p>\n<p>sprintf\u662f\u683c\u5f0f\u5316\u51fd\u6570\u3002\u5c06\u4e00\u6bb5\u6570\u636e\u901a\u8fc7\u7279\u5b9a\u7684\u683c\u5f0f\uff0c\u683c\u5f0f\u5316\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\u7f13\u51b2\u533a\u4e2d\u53bb\u3002sprintf\u683c\u5f0f\u5316\u7684\u51fd\u6570\u7684\u957f\u5ea6\u4e0d\u53ef\u63a7\uff0c\u6709\u53ef\u80fd\u683c\u5f0f\u5316\u540e\u7684\u5b57\u7b26\u4e32\u4f1a\u8d85\u51fa\u7f13\u51b2\u533a\u7684\u5927\u5c0f\uff0c\u9020\u6210\u6ea2\u51fa\u3002<\/p>\n<p>14\u7b54\u6848\u662f\uff1a<\/p>\n<p>a) int a; \/\/ An integer<\/p>\n<p>b) int *a; \/\/ A pointer to an integer<\/p>\n<p>c) int **a; \/\/ A pointer to a pointer to an integer<\/p>\n<p>d) int a[10]; \/\/ An array of 10 integers<\/p>\n<p>e) int *a[10]; \/\/ An array of 10 pointers to integers<\/p>\n<p>f) int (*a)[10]; \/\/ A pointer to an array of 10 integers<\/p>\n<p>g) int (*a)(int); \/\/ A pointer to a function a that takes an  integer argument and returns an integer<\/p>\n<p>  h) int (*a[10])(int); \/\/ An array of 10 pointers to functi&lt;strong&gt;*&lt;\/strong&gt;   that take an integer argument and return an integer <\/p>\n<p>&lt;pre&gt;&lt;code&gt;            &quot;&#8220;`<br \/>\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; strcpy\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u62f7\u8d1d\u7684\u51fd\u6570\uff0c\u5b83\u7684\u51fd\u6570\u539f\u578b\u4e3astrcpy(char ds [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-42469","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42469","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=42469"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42469\/revisions"}],"predecessor-version":[{"id":42470,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/42469\/revisions\/42470"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=42469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=42469"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=42469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}