{"id":88165,"date":"2026-07-31T15:50:23","date_gmt":"2026-07-31T07:50:23","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/88165.html"},"modified":"2026-07-31T15:50:23","modified_gmt":"2026-07-31T07:50:23","slug":"c-%e5%b7%a5%e6%8e%a7%e9%80%9a%e7%94%a8%ef%bc%9a32-%e4%bd%8d-dint-%e5%9b%9b%e7%a7%8d%e5%ad%97%e8%8a%82%e5%ba%8f%e4%b8%80%e9%94%ae%e8%bd%ac%e6%8d%a2%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/88165.html","title":{"rendered":"C++ \u5de5\u63a7\u901a\u7528\uff1a32 \u4f4d DINT \u56db\u79cd\u5b57\u8282\u5e8f\u4e00\u952e\u8f6c\u6362\u51fd\u6570"},"content":{"rendered":"<h2>C&#043;&#043; \u5de5\u63a7\u901a\u7528&#xff1a;32 \u4f4d DINT \u56db\u79cd\u5b57\u8282\u5e8f\u4e00\u952e\u8f6c\u6362\u51fd\u6570&#xff08;ABCD\/CDAB\/BADC\/DCBA&#xff09;<\/h2>\n<h3>\u524d\u8a00<\/h3>\n<p>\u505a Modbus TCP\/RTU \u5de5\u63a7\u4e0a\u4f4d\u673a\u5f00\u53d1&#xff0c;\u6700\u5934\u75bc\u7684\u95ee\u9898\u4e4b\u4e00\u5c31\u662f32 \u4f4d\u6570\u636e\u5b57\u8282\u5e8f\u4e0d\u7edf\u4e00\u3002 PLC \u7684 DINT&#xff08;32 \u4f4d\u6709\u7b26\u53f7\u6574\u6570&#xff09;\u3001REAL&#xff08;32 \u4f4d\u6d6e\u70b9\u6570&#xff09;\u5360\u7528 2 \u4e2a\u8fde\u7eed 16 \u4f4d\u5bc4\u5b58\u5668&#xff0c;\u4e0d\u540c\u5382\u5546\u8bbe\u5907\u5b57\u8282\u6392\u5e03\u4e94\u82b1\u516b\u95e8&#xff1a;<\/p>\n<ul>\n<li>\u897f\u95e8\u5b50\u6807\u51c6&#xff1a;ABCD&#xff08;\u5927\u7aef&#xff09;<\/li>\n<li>\u6c47\u5ddd\u3001\u53f0\u8fbe\u3001\u5927\u91cf\u56fd\u4ea7\u673a\u5668\u4eba&#xff1a;CDAB\u3001BADC<\/li>\n<li>\u90e8\u5206\u5c0f\u578b\u63a7\u5236\u5668&#xff1a;DCBA&#xff08;\u5c0f\u7aef&#xff09;<\/li>\n<\/ul>\n<p>Windows \u81ea\u5e26htonl\/ntohl\u4ec5\u652f\u6301\u5927\u5c0f\u7aef\u8f6c\u6362&#xff0c;\u65e0\u6cd5\u8986\u76d6 CDAB\u3001BADC \u8fd9\u4e24\u79cd\u53cc\u5b57\u4ea4\u6362\u6a21\u5f0f\u3002 \u4e3a\u6b64\u5c01\u88c5\u4e00\u4e2a\u901a\u7528\u8f6c\u6362\u51fd\u6570&#xff0c;\u4e00\u6b21\u8c03\u7528\u8f93\u51fa 4 \u79cd\u4e3b\u6d41\u5b57\u8282\u5e8f&#xff0c;\u8c03\u8bd5\u3001\u9002\u914d\u591a\u54c1\u724c PLC \u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<p>\u8fd0\u884c\u73af\u5883&#xff1a;Windows &#043; MSVC \/ Qt MSVC&#xff08;x86\/x64&#xff09;<\/p>\n<h3>\u56db\u79cd\u5b57\u8282\u5e8f\u5b9a\u4e49\u8bf4\u660e<\/h3>\n<p>\u5047\u8bbe 32 \u4f4d\u539f\u59cb\u6574\u6570&#xff1a;0x11223344<\/p>\n<p>plaintext<\/p>\n<p>bit31~24(A)<br \/>\nbit23~16(B)<br \/>\nbit15~8(C)<br \/>\nbit7~0(D)<\/p>\n<p>A&#061;0x11 ,<br \/>\nB&#061;0x22 ,<br \/>\nC&#061;0x33 ,<br \/>\nD&#061;0x44<\/p>\n<p>\u8868\u683c<\/p>\n<table>\n<tr>\u540d\u79f0\u5185\u5b58\u5b57\u8282\u5e8f\u5217\u5341\u516d\u8fdb\u5236\u7ed3\u679c\u9002\u7528\u8bbe\u5907\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>ABCD<\/td>\n<td>A B C D<\/td>\n<td>0x11223344<\/td>\n<td>\u897f\u95e8\u5b50\u3001\u6807\u51c6\u5927\u7aef<\/td>\n<\/tr>\n<tr>\n<td>CDAB<\/td>\n<td>C D A B<\/td>\n<td>0x33441122<\/td>\n<td>\u5927\u91cf\u56fd\u4ea7 PLC\u3001\u673a\u5668\u4eba<\/td>\n<\/tr>\n<tr>\n<td>BADC<\/td>\n<td>B A D C<\/td>\n<td>0x22114433<\/td>\n<td>\u90e8\u5206\u8fd0\u52a8\u63a7\u5236\u5668\u3001\u4eea\u8868<\/td>\n<\/tr>\n<tr>\n<td>DCBA<\/td>\n<td>D C B A<\/td>\n<td>0x44332211<\/td>\n<td>\u5c0f\u7aef\u6a21\u5f0f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b8c\u6574\u6e90\u7801<\/h3>\n<p>\/**<br \/>\n * &#064;brief 32\u4f4dDINT\u56db\u79cd\u5b57\u8282\u5e8f\u8f6c\u6362\u51fd\u6570<br \/>\n * &#064;param input \u539f\u59cb32\u4f4d\u6709\u7b26\u53f7\u6574\u6570(PLC DINT)<br \/>\n * &#064;param ABCD \u8f93\u51fa A B C D \u539f\u59cb\u5e8f<br \/>\n * &#064;param CDAB \u8f93\u51fa C D A B<br \/>\n * &#064;param BADC \u8f93\u51fa B A D C<br \/>\n * &#064;param DCBA \u8f93\u51fa D C B A<br \/>\n * &#064;note \u4ec5Windows MSVC\u73af\u5883\u4f7f\u7528&#xff0c;\u9002\u914dModbus\u4e0a\u4f4d\u673a\u901a\u4fe1<br \/>\n *\/<br \/>\nvoid ABCD_SWAP(int input, int* ABCD, int* CDAB, int* BADC, int* DCBA)<br \/>\n{<br \/>\n    \/\/ \u7a7a\u6307\u9488\u4fdd\u62a4&#xff0c;\u9632\u6b62\u5916\u90e8\u5f02\u5e38\u8c03\u7528\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83<br \/>\n    if (!ABCD || !CDAB || !BADC || !DCBA)<br \/>\n        return;<\/p>\n<p>    unsigned char A, B, C, D;<br \/>\n    unsigned int uIn &#061; (unsigned int)input;<br \/>\n    *ABCD &#061; input;<\/p>\n<p>    \/\/ \u62c6\u52064\u4e2a\u5b57\u8282<br \/>\n    D &#061; uIn &amp; 0xFF;<br \/>\n    C &#061; (uIn &gt;&gt; 8) &amp; 0xFF;<br \/>\n    B &#061; (uIn &gt;&gt; 16) &amp; 0xFF;<br \/>\n    A &#061; (uIn &gt;&gt; 24) &amp; 0xFF;<\/p>\n<p>    \/\/ \u91cd\u7ec4\u56db\u79cd\u5b57\u8282\u987a\u5e8f<br \/>\n    *CDAB &#061; (unsigned int)C &lt;&lt; 24 | (unsigned int)D &lt;&lt; 16 | (unsigned int)A &lt;&lt; 8 | B;<br \/>\n    *BADC &#061; (unsigned int)B &lt;&lt; 24 | (unsigned int)A &lt;&lt; 16 | (unsigned int)D &lt;&lt; 8 | C;<br \/>\n    *DCBA &#061; (unsigned int)D &lt;&lt; 24 | (unsigned int)C &lt;&lt; 16 | (unsigned int)B &lt;&lt; 8 | A;<br \/>\n}<\/p>\n<h3>\u8c03\u7528\u793a\u4f8b &amp; \u5355\u5143\u6d4b\u8bd5<\/h3>\n<\/p>\n<p>#include &lt;iostream&gt;<br \/>\nusing namespace std;<\/p>\n<p>int main()<br \/>\n{<br \/>\n    int ABCD, CDAB, BADC, DCBA;<br \/>\n    \/\/ \u6d4b\u8bd5\u6837\u4f8b 0x11223344<br \/>\n    ABCD_SWAP(0x11223344, &amp;ABCD, &amp;CDAB, &amp;BADC, &amp;DCBA);<\/p>\n<p>    printf(&#034;ABCD &#061; 0x%08X\\\\n&#034;, (unsigned int)ABCD);<br \/>\n    printf(&#034;CDAB &#061; 0x%08X\\\\n&#034;, (unsigned int)CDAB);<br \/>\n    printf(&#034;BADC &#061; 0x%08X\\\\n&#034;, (unsigned int)BADC);<br \/>\n    printf(&#034;DCBA &#061; 0x%08X\\\\n&#034;, (unsigned int)DCBA);<\/p>\n<p>    return 0;<br \/>\n}<\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff1a;<\/p>\n<p>ABCD &#061; 0x11223344<br \/>\nCDAB &#061; 0x33441122<br \/>\nBADC &#061; 0x22114433<br \/>\nDCBA &#061; 0x44332211<\/p>\n<h3>\u5173\u952e\u6280\u672f\u8981\u70b9\u8bf4\u660e<\/h3>\n<h4>1. \u4e3a\u4ec0\u4e48\u5148\u8f6c unsigned int \u62c6\u5206&#xff1f;<\/h4>\n<p>\u539f\u59cb\u53c2\u6570 int \u662f\u6709\u7b26\u53f7\u7c7b\u578b\u3002 \u5982\u679c\u6570\u503c\u4e3a\u8d1f\u6570&#xff0c;\u76f4\u63a5 input &gt;&gt; 24 \u4f1a\u89e6\u53d1\u7b97\u672f\u53f3\u79fb&#xff08;\u9ad8\u4f4d\u8865 1&#xff09;&#xff0c;\u5b57\u8282\u62c6\u5206\u51fa\u9519\u3002 \u5148\u5f3a\u5236\u8f6c\u4e3aunsigned int&#xff0c;\u4fdd\u8bc1\u903b\u8f91\u53f3\u79fb&#xff0c;\u9ad8\u4f4e\u5b57\u8282\u62c6\u5206\u6c38\u8fdc\u7a33\u5b9a\u3002<\/p>\n<h4>2. \u79fb\u4f4d\u64cd\u4f5c\u5f3a\u5236\u8f6c\u6362 unsigned int<\/h4>\n<p>unsigned char \u76f4\u63a5\u5de6\u79fb 24 \u4f4d\u4f1a\u63d0\u5347\u4e3a\u6709\u7b26\u53f7 int&#xff0c;\u5b58\u5728\u7b26\u53f7\u6ea2\u51fa\u9690\u60a3\u3002 (unsigned int)C &lt;&lt; 24 \u4fdd\u8bc1\u79fb\u4f4d\u5168\u7a0b\u65e0\u7b26\u53f7\u8fd0\u7b97&#xff0c;\u89c4\u907f\u672a\u5b9a\u4e49\u884c\u4e3a\u3002<\/p>\n<h4>3. \u7a7a\u6307\u9488\u5224\u65ad&#xff08;\u5de5\u63a7\u8f6f\u4ef6\u5fc5\u5907&#xff09;<\/h4>\n<p>\u4e0a\u4f4d\u673a\u8f6f\u4ef6\u5916\u90e8\u8c03\u7528\u903b\u8f91\u590d\u6742&#xff0c;\u5982\u679c\u5916\u90e8\u4f20\u5165 nullptr&#xff0c;\u4e0d\u505a\u5224\u65ad\u4f1a\u76f4\u63a5\u89e6\u53d1\u8bbf\u95ee\u5f02\u5e38\u3001\u7a0b\u5e8f\u95ea\u9000\u3002\u5de5\u4e1a\u4ee3\u7801\u7a33\u5b9a\u6027\u4f18\u5148\u3002<\/p>\n<h4>4. \u62d3\u5c55&#xff1a;\u540c\u65f6\u652f\u6301 32 \u4f4d\u6d6e\u70b9\u6570 REAL<\/h4>\n<p>PLC 32 \u4f4d\u6d6e\u70b9 REAL \u540c\u6837 4 \u5b57\u8282&#xff0c;\u8fd9\u5957\u8f6c\u6362\u903b\u8f91\u5b8c\u5168\u901a\u7528\u3002\u4f7f\u7528\u65b9\u5f0f&#xff1a;<\/p>\n<p>    \/\/ &#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;\u6253\u5370\u9a8c\u8bc1\u90e8\u5206&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;<br \/>\n    float realVal &#061; 123.456f;<br \/>\n    \/\/ \u539f\u59cb\u65b9\u5f0f&#xff1a;\u6ce8\u610f\u6807\u51c6C&#043;&#043;\u5c5e\u4e8eUB&#xff0c;\u5d4c\u5165\u5f0f\u7ecf\u5e38\u8fd9\u4e48\u5199<br \/>\n    int raw &#061; *(int*)(&amp;realVal);<\/p>\n<p>    int a,b,c,d;<br \/>\n    ABCD_SWAP(raw, &amp;a, &amp;b, &amp;c, &amp;d);<br \/>\n    printf(&#034;float\u539f\u503c &#061; %f\\\\n&#034;, realVal);<br \/>\n    printf(&#034;\u539f\u59cb32\u4f4draw(\u5341\u516d\u8fdb\u5236) &#061; 0x%08X\\\\n&#034;, (unsigned int)raw);<br \/>\n    printf(&#034;\u62c6\u5206\u540e4\u4e2a\u5b57\u8282&#xff1a;\\\\n&#034;);<br \/>\n    printf(&#034;a &#061; 0x%02X \\\\nb &#061; 0x%02X \\\\nc &#061; 0x%02X \\\\nd &#061; 0x%02X\\\\n&#034;, a,b,c,d);<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"316\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731075022-6a6c53be850c7.png\" width=\"497\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C \u5de5\u63a7\u901a\u7528&#xff1a;32 \u4f4d DINT \u56db\u79cd\u5b57\u8282\u5e8f\u4e00\u952e\u8f6c\u6362\u51fd\u6570&#xff08;ABCD\/CDAB\/BADC\/DCBA&#xff09;\u524d\u8a00\u505a Modbus TCP\/RTU \u5de5\u63a7\u4e0a\u4f4d\u673a\u5f00\u53d1&#xff0c;\u6700\u5934\u75bc\u7684\u95ee\u9898\u4e4b\u4e00\u5c31\u662f32 \u4f4d\u6570\u636e\u5b57\u8282\u5e8f\u4e0d\u7edf\u4e00\u3002 PLC \u7684 DINT&#xff08;32 \u4f4d\u6709\u7b26\u53f7\u6574\u6570&#xff09;\u3001REAL&#xff08;32 \u4f4d\u6d6e\u70b9\u6570&#xff09;\u5360\u7528 2 \u4e2a\u8fde\u7eed 16 \u4f4d\u5bc4\u5b58\u5668&#xff0c;\u4e0d\u540c\u5382\u5546\u8bbe\u5907\u5b57\u8282\u6392\u5e03\u4e94\u82b1\u516b\u95e8&#xff1a;\u897f\u95e8\u5b50<\/p>\n","protected":false},"author":2,"featured_media":88164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[217,270,269],"topic":[],"class_list":["post-88165","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-stm32","tag-270","tag-269"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C++ \u5de5\u63a7\u901a\u7528\uff1a32 \u4f4d DINT \u56db\u79cd\u5b57\u8282\u5e8f\u4e00\u952e\u8f6c\u6362\u51fd\u6570 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/88165.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ \u5de5\u63a7\u901a\u7528\uff1a32 \u4f4d DINT \u56db\u79cd\u5b57\u8282\u5e8f\u4e00\u952e\u8f6c\u6362\u51fd\u6570 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"C \u5de5\u63a7\u901a\u7528&#xff1a;32 \u4f4d DINT \u56db\u79cd\u5b57\u8282\u5e8f\u4e00\u952e\u8f6c\u6362\u51fd\u6570&#xff08;ABCD\/CDAB\/BADC\/DCBA&#xff09;\u524d\u8a00\u505a Modbus TCP\/RTU \u5de5\u63a7\u4e0a\u4f4d\u673a\u5f00\u53d1&#xff0c;\u6700\u5934\u75bc\u7684\u95ee\u9898\u4e4b\u4e00\u5c31\u662f32 \u4f4d\u6570\u636e\u5b57\u8282\u5e8f\u4e0d\u7edf\u4e00\u3002 PLC \u7684 DINT&#xff08;32 \u4f4d\u6709\u7b26\u53f7\u6574\u6570&#xff09;\u3001REAL&#xff08;32 \u4f4d\u6d6e\u70b9\u6570&#xff09;\u5360\u7528 2 \u4e2a\u8fde\u7eed 16 \u4f4d\u5bc4\u5b58\u5668&#xff0c;\u4e0d\u540c\u5382\u5546\u8bbe\u5907\u5b57\u8282\u6392\u5e03\u4e94\u82b1\u516b\u95e8&#xff1a;\u897f\u95e8\u5b50\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/88165.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-31T07:50:23+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260731075022-6a6c53be850c7.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" 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