{"id":44858,"date":"2022-12-02T16:27:49","date_gmt":"2023-12-21T21:57:47","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44858-2\/"},"modified":"2024-04-29T03:27:33","modified_gmt":"2024-04-28T19:27:33","slug":"44858-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44858-2\/","title":{"rendered":""},"content":{"rendered":"

Go \u8a00\u8a9e\uff08\u4ee5\u4e0b Golang\uff09\u3067\u3001make([]byte, 8, 8) \u3067\u4f5c\u6210\u3057\u305f 8 \u30d0\u30a4\u30c8\u306e\u30b9\u30e9\u30a4\u30b9\u3092 uint64\u7b26\u53f7\u306a\u3057int \u306b\u5909\u63db\u3057\u305f\u3044\u3002<\/p><\/blockquote>\n

\u300cgolang “[]byte” uint64 \u5909\u63db\u300d\u3067\u30b0\u30b0\u3063\u3066\u3082\u3001\u9006\u306e uint64 \u304b\u3089 []byte \u306b\u5909\u63db\u3059\u308b\u3082\u306e\u3084\u3001int32 \u306e\u30ea\u30c8\u30eb\u30a8\u30f3\u30c7\u30a3\u30a2\u30f3\u5f8c\u308d\u8a70\u3081\u65b9\u5f0f \u3060\u3063\u305f\u308a\u3001\u7b26\u53f7\u3042\u308a\u524d\u63d0\u306e\u3082\u306e\u3070\u304b\u308a\u3060\u3063\u305f\u306e\u3067\u3001\u81ea\u5206\u306e\u30b0\u30b0\u30e9\u30d3\u30ea\u30c6\u30a3\u3068\u3057\u3066\u3002<\/p>\n

TL; DR \uff08\u4eca\u5317\u7523\u696d\uff09<\/h2>\n

encoding\/binary \u306e Golang \u6a19\u6e96\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u3046\u3002<\/p>\n

binary.BigEndian.Uint64(b []byte) uint64 \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u30024 \u30d0\u30a4\u30c8\u30fb\u30b9\u30e9\u30a4\u30b9\u306e\u5834\u5408\u306f binary.BigEndian.Uint16(b []byte) uint16\u3002<\/p>\n

\u4f7f\u3044\u65b9: myUint64 := binary.BigEndian.Uint64(myByteSlice)
\nmy8byte := []byte{255, 0, 255, 0, 255, 0, 255, 0}
\nmyUint64 := binary.BigEndian.Uint64(my8byte)<\/p>\n

fmt.Printf(
\n“Type: %T\\nDec : %d\\nBin : %064b\\n”,
\nmyUint64, myUint64, myUint64,
\n)
\n\/\/ Output:
\n\/\/ Type: uint64
\n\/\/ Dec : 18374966859414961920
\n\/\/ Bin : 1111111100000000111111110000000011111111000000001111111100000000<\/p>\n

\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u52d5\u4f5c\u3092\u898b\u308b @ Go Playground<\/p>\n

TS; DR cap \u4ed8\u304d []byte \u30b9\u30e9\u30a4\u30b9\u306e\u7d50\u5408\u30fb\u9023\u7d50\u304b\u3089\u306e UINT64<\/h2>\n

2 \u3064\u306e 4 \u30d0\u30a4\u30c8\u9577\u306e\u30c7\u30fc\u30bf\u3092\u3001\u5404\u3005 byte \u30b9\u30e9\u30a4\u30b9\uff08[]byte\u3001\u30d0\u30a4\u30c8\u3054\u3068\u306e\u914d\u5217\u72b6\u614b\uff09\u306b\u30d6\u30c4\u5207\u308a\u306b\u3057\u305f\u5f8c\u3001\u30b4\u30cb\u30e7\u30b4\u30cb\u30e7\u3057\u3066\u304b\u3089\u30011 \u3064\u306b\u7d50\u5408\u3057\u305f len = 8\u8981\u7d20\u6570 8 \u306e\u30b9\u30e9\u30a4\u30b9\u3092 uint64 \u306b\u5909\u63db\u3057\u305f\u304b\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n

\u3053\u306e\u6642\u3001cap \u4ed8\u304d\u9818\u57df\u4e88\u7d04\u6e08\u307f\u3067\u30a4\u30b8\u30c3\u3066\u3044\u308b\u306e\u3067\u3001\u306a\u308b\u3079\u304f\u30ea\u30a2\u30ed\u30b1\u30fc\u30c8\u9818\u57df\u3092\u518d\u78ba\u4fdd\u3055\u305b\u305f\u304f\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u3002\u3064\u307e\u308a append \u3092\u4f7f\u308f\u306a\u3044\u3067\u7d50\u5408\u3057\u305f\u304b\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n

\u8ab0\u306b\u9700\u8981\u304c\u3042\u308b\u306e\u304b\u308f\u304b\u308a\u307e\u305b\u3093\u304c\u3001\u4ee5\u4e0b\u306f 4 \u30d0\u30a4\u30c8\u9577\u306e 2 \u3064\u306e\u30b9\u30e9\u30a4\u30b9 \u3092\u7d50\u5408\u3057\u305f\u30018 \u30d0\u30a4\u30c8\u30fb\u30b9\u30e9\u30a4\u30b9\u3092 uint64 \u306b\u5909\u63db\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n

package<\/span> main<\/span>\r\n\r\nimport<\/span> (<\/span>\r\n\t\"encoding\/binary\"<\/span>\r\n\t\"fmt\"<\/span>\r\n)<\/span>\r\n\r\nfunc<\/span> main<\/span>()<\/span> {<\/span>\r\n\tvar<\/span> v<\/span> =<\/span> make<\/span>([]<\/span>byte<\/span>,<\/span> 8<\/span>,<\/span> 8<\/span>)<\/span> \/\/ \u306a\u305c\u304b 8 \u30d0\u30a4\u30c8 cap \u3067\u5ba3\u8a00\u3055\u308c\u3066\u3044\u308b\u5909\u6570<\/span>\r\n\r\n\ta8<\/span> :=<\/span> []<\/span>byte<\/span>{<\/span>49<\/span>,<\/span> 50<\/span>,<\/span> 51<\/span>,<\/span> 52<\/span>}<\/span> \/\/ \u30b4\u30cb\u30e7\u30b4\u30cb\u30e7\u6e08\u307f\u306e 4 \u30d0\u30a4\u30c8\u30c7\u30fc\u30bf<\/span>\r\n\tb8<\/span> :=<\/span> []<\/span>byte<\/span>{<\/span>65<\/span>,<\/span> 66<\/span>,<\/span> 67<\/span>,<\/span> 68<\/span>}<\/span> \/\/ \u30b4\u30cb\u30e7\u30b4\u30cb\u30e7\u6e08\u307f\u306e 4 \u30d0\u30a4\u30c8\u30c7\u30fc\u30bf<\/span>\r\n\r\n\tcopy<\/span>(<\/span>v<\/span>,<\/span> a8<\/span>)<\/span>     \/\/ \u524d\u534a\u306b\u30b3\u30d4\u30fc<\/span>\r\n\tcopy<\/span>(<\/span>v<\/span>[<\/span>4<\/span>:<\/span>],<\/span> b8<\/span>)<\/span> \/\/ \u5f8c\u534a\u306b\u30b3\u30d4\u30fc<\/span>\r\n\r\n\tfmt<\/span>.<\/span>Printf<\/span>(<\/span>\r\n\t\t\"v = Len: %d, Cap: %d, String: <\/span>\\\"<\/span>%s<\/span>\\\"<\/span>,\u3000Data: %d<\/span>\\n<\/span>\"<\/span>,<\/span>\r\n\t\tlen<\/span>(<\/span>v<\/span>),<\/span>\r\n\t\tcap<\/span>(<\/span>v<\/span>),<\/span>\r\n\t\tstring<\/span>(<\/span>v<\/span>),<\/span>\r\n\t\tbinary<\/span>.<\/span>BigEndian<\/span>.<\/span>Uint64<\/span>(<\/span>v<\/span>),<\/span> \/\/ \u3053\u3053\u304c\u30dd\u30a4\u30f3\u30c8<\/span>\r\n\t)<\/span>\r\n}<\/span>\r\n\r\n\/\/ Output:<\/span>\r\n\/\/ v = Len: 8, Cap: 8, String: \"1234ABCD\",\u3000Data: 3544952156220179268<\/span>\r\n<\/code><\/pre>\n
\u30aa\u30f3\u30e9\u30a4\u30f3\u3067\u52d5\u4f5c\u3092\u898b\u308b @ Go Playground<\/p>\n
\u53c2\u8003\u6587\u732e<\/h2>\n
Converting variable-sized []byte to int64 in Golang @ Stackoverflow<\/p>\n","protected":false},"excerpt":{"rendered":"
Go \u8a00\u8a9e\uff08\u4ee5\u4e0b Golang\uff09\u3067\u3001make([]byte, 8, 8) \u3067\u4f5c\u6210\u3057\u305f 8 \u30d0\u30a4\u30c8\u306e\u30b9\u30e9\u30a4\u30b9\u3092  […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44858","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n- Blog - Silicon Cloud<\/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.silicloud.com\/zh\/blog\/44858-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"Go \u8a00\u8a9e\uff08\u4ee5\u4e0b Golang\uff09\u3067\u3001make([]byte, 8, 8) \u3067\u4f5c\u6210\u3057\u305f 8 \u30d0\u30a4\u30c8\u306e\u30b9\u30e9\u30a4\u30b9\u3092 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/44858-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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