{"id":45727,"date":"2024-01-08T10:58:04","date_gmt":"2023-03-21T04:17:41","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45727-2\/"},"modified":"2024-05-04T17:23:30","modified_gmt":"2024-05-04T09:23:30","slug":"45727-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45727-2\/","title":{"rendered":""},"content":{"rendered":"<h1>\u306f\u3058\u3081\u306b<\/h1>\n<p>Rust Advent Calendar 12\/8 \u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<blockquote><p>\u8981\u6c42\u3055\u308c\u305f\u7a7a\u9593\u3084\u6642\u9593\u5185\u3067\u306e\u52d5\u4f5c\u3001 \u30c7\u30d0\u30a4\u30b9\u30c9\u30e9\u30a4\u30d0\u3084\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306e\u3088\u3046\u306a\u4f4e\u30ec\u30d9\u30eb\u306a\u30b3\u30fc\u30c9\u306a\u3069\u4ed6\u306e\u8a00\u8a9e\u304c\u82e6\u624b\u3068\u3059\u308b\u591a\u6570\u306e\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3092\u5f97\u610f\u3068\u3057\u307e\u3059\u3002<\/p><\/blockquote>\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9eRust \u3088\u308a<\/p>\n<p>\u3053\u306e\u3046\u305f\u3044\u6587\u53e5\u306b\u3084\u3089\u308c\u30019\u6708\u304f\u3089\u3044\u304b\u3089 Windows API \u3092 Rust \u3067\u547c\u3073\u51fa\u3057\u3066\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u60c5\u5831\u3092\u53d6\u5f97\u3059\u308b\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3044\u307e\u3057\u305f\u3002<br \/>\nROki1988\/perf_client<\/p>\n<p>Windows API \u306e\u547c\u3073\u51fa\u3057\u306b\u3064\u3044\u3066\u306f\u3001\u3059\u3067\u306b\u3042\u3063\u305f retep998\/winapi-rs \u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3067\u3001winapi-rs \u306f unsafe \u306a\u95a2\u6570\u305f\u3061\u3067\u3059\u3002<br \/>\n\u3053\u306e\u30b3\u30fc\u30c9\u305f\u3061\u3092\u3069\u3046 Rust \u306e\u4e16\u754c\u3078\u5f15\u304d\u8fbc\u3093\u3060\u3089\u3044\u3044\u3093\u3060\u308d\u3046\u3001\u3068\u8003\u3048\u305f\u308a\u3057\u305f\u306e\u3067\u3001<br \/>\n\u305d\u3061\u3089\u306b\u3064\u3044\u3066\u89e6\u308c\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h1>Wrapper \u3092\u66f8\u304f<\/h1>\n<p>\u7d50\u8ad6\u3068\u3057\u3066\u3001Wrapper \u95a2\u6570\u3092\u66f8\u304f\u3053\u3068\u3067\u5bfe\u5fdc\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">fn<\/span> <span class=\"nf\">pdh_open_query<\/span><span class=\"p\">()<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">Result<\/span><span class=\"o\">&lt;<\/span><span class=\"nn\">winapi<\/span><span class=\"p\">::<\/span><span class=\"n\">PDH_HQUERY<\/span><span class=\"p\">,<\/span> <span class=\"nn\">winapi<\/span><span class=\"p\">::<\/span><span class=\"n\">PDH_STATUS<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">use<\/span> <span class=\"nn\">std<\/span><span class=\"p\">::<\/span><span class=\"n\">ptr<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">hquery<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">winapi<\/span><span class=\"p\">::<\/span><span class=\"n\">INVALID_HANDLE_VALUE<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">ret<\/span> <span class=\"o\">=<\/span> <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span> <span class=\"nn\">pdh<\/span><span class=\"p\">::<\/span><span class=\"nf\">PdhOpenQueryW<\/span><span class=\"p\">(<\/span><span class=\"nn\">ptr<\/span><span class=\"p\">::<\/span><span class=\"nf\">null<\/span><span class=\"p\">(),<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"n\">hquery<\/span><span class=\"p\">)<\/span> <span class=\"p\">};<\/span>\r\n\r\n    <span class=\"k\">if<\/span> <span class=\"nn\">winapi<\/span><span class=\"p\">::<\/span><span class=\"nn\">winerror<\/span><span class=\"p\">::<\/span><span class=\"nf\">SUCCEEDED<\/span><span class=\"p\">(<\/span><span class=\"n\">ret<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">Ok<\/span><span class=\"p\">(<\/span><span class=\"n\">hquery<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">Err<\/span><span class=\"p\">(<\/span><span class=\"n\">ret<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u95a2\u6570\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30ab\u30a6\u30f3\u30bf\u30fc\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b PDH* \u95a2\u6570\u306e1\u3064\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\npdh::PdhOpenQueryW \u304c winapi-rs \u306b\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u95a2\u6570\u3067\u3059\u3002<\/p>\n<p>\u66f8\u3044\u305f\u308a\u6d88\u3057\u305f\u308a\u3057\u306a\u304c\u3089\u3001\u4ee5\u4e0b\u306e\u65b9\u91dd\u304c\u5f62\u306b\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Wrapper \u95a2\u6570\u5185\u3067 unsafe \u3092\u5b8c\u7d50\u3055\u305b\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>\u304b\u3064 unsafe \u306e\u7bc4\u56f2\u3092\u306a\u308b\u3079\u304f\u5c0f\u3055\u304f\u3059\u308b<\/p>\n<p>\u7d50\u679c\u306f Result \u306e\u6587\u8108\u3067\u5305\u3080<\/p>\n<p>\u304b\u3064 Wrapper \u95a2\u6570\u306e\u30a8\u30e9\u30fc\u306e\u578b\u306f ERROR_CODE \u3067\u305d\u308d\u3048\u308b<\/p>\n<p>\u305f\u3076\u3093\u5f53\u305f\u308a\u524d\u306e\u3053\u3068\u66f8\u3044\u3066\u307e\u3059w \u3051\u3069\u305d\u308d\u3048\u308b\u3053\u3068\u304c\u5927\u4e8b\u3001\u3068\u3057\u307e\u3057\u305f\u3002<br \/>\n\u3053\u308c\u3067 Wrapper \u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u5143\u3067\u306f Rust \u306e\u4e16\u754c\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3044\u3051\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">impl<\/span><span class=\"o\">&lt;<\/span><span class=\"nv\">'a<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">Iterator<\/span> <span class=\"k\">for<\/span> <span class=\"n\">PdhControllerIterator<\/span><span class=\"o\">&lt;<\/span><span class=\"nv\">'a<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">type<\/span> <span class=\"n\">Item<\/span> <span class=\"o\">=<\/span> <span class=\"n\">PdhCollectValue<\/span><span class=\"p\">;<\/span>\r\n\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">next<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">Option<\/span><span class=\"o\">&lt;<\/span><span class=\"nn\">Self<\/span><span class=\"p\">::<\/span><span class=\"n\">Item<\/span><span class=\"o\">&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"k\">self<\/span><span class=\"py\">.index<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">0<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nf\">pdh_collect_query_data<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"py\">.pdhc.hquery<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">}<\/span>\r\n\r\n        <span class=\"k\">let<\/span> <span class=\"n\">item<\/span> <span class=\"o\">=<\/span> <span class=\"k\">self<\/span><span class=\"py\">.pdhc<\/span>\r\n            <span class=\"py\">.items<\/span>\r\n            <span class=\"nf\">.get<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"py\">.index<\/span><span class=\"p\">)<\/span>\r\n            <span class=\"nf\">.iter<\/span><span class=\"p\">()<\/span>\r\n            <span class=\"nf\">.flat_map<\/span><span class=\"p\">(|<\/span><span class=\"n\">c<\/span><span class=\"p\">|<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"nf\">pdh_get_formatted_counter_value<\/span><span class=\"p\">(<\/span><span class=\"n\">c<\/span><span class=\"py\">.hcounter<\/span><span class=\"p\">,<\/span> <span class=\"n\">PDH_FMT_DOUBLE<\/span><span class=\"p\">)<\/span>\r\n                    <span class=\"nf\">.map<\/span><span class=\"p\">(|<\/span><span class=\"n\">v<\/span><span class=\"p\">|<\/span> <span class=\"nn\">PdhCollectValue<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"n\">c<\/span><span class=\"py\">.element<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"p\">))<\/span>\r\n            <span class=\"p\">})<\/span>\r\n            <span class=\"nf\">.last<\/span><span class=\"p\">();<\/span>\r\n        <span class=\"k\">self<\/span><span class=\"py\">.index<\/span> <span class=\"o\">+=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"n\">item<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u30b3\u30fc\u30c9\u3067\u306f pdh_collect_query_data \u3068 pdh_get_formatted_counter_value \u304c Wrapper \u95a2\u6570\u306b\u3042\u305f\u308a\u307e\u3059\u3002<br \/>\nunsafe \u306f\u4e00\u5207\u898b\u5f53\u305f\u3089\u305a\u3001Rust \u306e\u4e16\u754c\u3067\u95a2\u6570\u3092\u3064\u306a\u3052\u306a\u304c\u3089\u3001\u30ac\u30b7\u30ac\u30b7\u66f8\u3044\u3066\u3044\u3051\u307e\u3057\u305f\u3002<\/p>\n<p>\u5177\u4f53\u7684\u306b\u306f Drop \u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u3066\u30cf\u30f3\u30c9\u30eb\u306e\u958b\u653e\u3092\u3057\u305f\u308a\u3001Iterator \u30c8\u30ec\u30a4\u30c8\u3092\u5b9f\u88c5\u3057\u3066 map \u3067\u5024\u3092\u53d6\u308a\u51fa\u305b\u308b\u3088\u3046\u306b\u3057\u305f\u308a\u3057\u307e\u3057\u305f\u3002<br \/>\n\u3044\u3084\u3041\u697d\u3057\u3044!<\/p>\n<h1>\u304a\u308f\u308a\u306b<\/h1>\n<p>Wrapper \u95a2\u6570\u3092\u66f8\u304f\u306e\u306f\u5c11\u3057\u624b\u9593\u3067\u3059\u304c\u3001Rust \u306e\u4e16\u754c\u306e\u547c\u3073\u51fa\u3057\u5143\u3067\u306f\u5fc3\u5730\u3088\u304f\u30b3\u30fc\u30c9\u304c\u304b\u3051\u307e\u3057\u305f\u3002<br \/>\n\u3046\u305f\u3044\u6587\u53e5\u306b\u3084\u3089\u308c\u3066\u3088\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u306b Rust Advent Calendar 12\/8 \u306e\u8a18\u4e8b\u3067\u3059\u3002 \u8981\u6c42\u3055\u308c\u305f\u7a7a\u9593\u3084\u6642\u9593\u5185\u3067\u306e\u52d5\u4f5c\u3001  [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45727","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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