{"id":50,"date":"2011-03-25T23:39:20","date_gmt":"2011-03-25T15:39:20","guid":{"rendered":"http:\/\/coderbee.net\/?p=50"},"modified":"2013-04-24T23:40:51","modified_gmt":"2013-04-24T15:40:51","slug":"jna%e5%ae%9e%e4%be%8b","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/java\/20110325\/50","title":{"rendered":"JNA\u5b9e\u4f8b"},"content":{"rendered":"<p>\u6709\u65f6\u5019Java\u9700\u8981\u901a\u8fc7\u8c03\u7528dll\u6765\u64cd\u4f5c\u5e95\u5c42\u7684\u786c\u4ef6\u6216\u8005\u73b0\u6709\u7684\u7ec4\u4ef6\uff0c\u76f4\u63a5\u4f7f\u7528JNI\u662f\u5bb9\u6613\u51fa\u9519\u7684\uff0c\u4e14\u9700\u8981\u7f16\u5199\u672c\u5730\u7684C\u4ee3\u7801\u3002\u8fd9\u91cc\u4ecb\u7ecd\u53e6\u4e00\u4e2a\u8c03\u7528dll\u7684\u66f4\u7b80\u5355\u7684\u65b9\u6cd5\uff1aJNA\u3002\u8fd9\u91cc\u4ecb\u7ecdJNA\u8c03\u7528dll\u7684\u672c\u5730\u65b9\u6cd5\u3001JNA\u56de\u8c03Java\u65b9\u6cd5\u4ee5\u53caJNA\u76f8\u5173\u7684\u4e00\u4e9b\u77e5\u8bc6\u70b9\u3002\u5982\u679c\u53bb\u7559\u610f\u7684\u8bdd\uff0c\u4f1a\u53d1\u73b0\u73b0\u5728\u5f88\u591ajar\u5305\u90fd\u7528JNA\u6765\u8c03\u7528dll\u4e86\u3002<\/p>\n<p><!--more--><br \/>\n\u8fd9\u7bc7\u6587\u7ae0\u539f\u53d1\u5e03\u5728Iteye\u7684\u4e2a\u4eba\u535a\u5ba2\u4e0a<a href=\"http:\/\/wen866595.iteye.com\/admin\/blogs\/974826\">http:\/\/wen866595.iteye.com\/admin\/blogs\/974826<\/a>\uff0c\u73b0\u5728\u8fc1\u79fb\u5230\u81ea\u5df1\u7684\u7ad9\u70b9\u4e0a\u3002<\/p>\n<h2>\u4f7f\u7528JNA\u7b80\u5355\u8c03\u7528DLL\u91cc\u7684\u51fd\u6570<\/h2>\n<ol>\n<li>\u5728VC\u4e0b\u521b\u5efa\u4e00\u4e2a\u52a8\u6001\u94fe\u63a5\u5e93\u9879\u76eetestJNA<\/p>\n<\/li>\n<li>\n<p>\u5728\u5934\u6587\u4ef6\u91cc\u58f0\u660e\u51fd\u6570<br \/>\n<code>extern \"C\" _declspec(dllexport) int add(int first, int second);<\/code><\/p>\n<\/li>\n<li>\n<p>\u5728\u6e90\u7801\u91cc\u5b9e\u73b0\u51fd\u6570<\/p>\n<\/li>\n<\/ol>\n<pre><code>\nint add(int first, int second) {\n    printf(\"(c) test jna : %d + %d = %d\", first, second, first + second);\n    return first + second;\n}\n<\/code><\/pre>\n<ol>\n<li>\n<p>\u751f\u6210dll\u6587\u4ef6\uff1a <code>testJNA.dll<\/code><\/p>\n<\/li>\n<li>\n<p>\u5728Java\u91cc\u5b9a\u4e49\u4e00\u4e2a\u8868\u793a\u94fe\u63a5\u5e93\u7684\u63a5\u53e3\uff0c\u63a5\u53e3<code>TestJnaLib<\/code>\u7ee7\u627f\u81ea<code>com.sun.jna.Library<\/code>,\u6b64\u63a5\u53e3\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff1a<br \/>\n<code>TestJnaLib INSTANCE = (TestJnaLib)Native.loadLibrary(\"testJNA.dll\", TestJnaLib.class);<\/code><br \/>\n\u6b64\u5b9e\u4f8b\u7531JNA\u901a\u8fc7\u53cd\u5c04\u81ea\u52a8\u751f\u6210\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b9a\u4e49\u5bf9\u5e94dll\u91cc\u7684\u65b9\u6cd5\uff1a <code>int add(int first, int second);<\/code><\/p>\n<\/li>\n<li>\n<p>\u8c03\u7528\u672c\u5730\u65b9\u6cd5\uff1a <code>TestJnaLib.INSTANCE.add(3, 5);<\/code><\/p>\n<\/li>\n<\/ol>\n<h2>JNA\u56de\u8c03Java\u65b9\u6cd5<\/h2>\n<ol>\n<li>\n<p>\u5728C\u8bed\u8a00\u90e8\u5206\u5b9a\u4e49\u5e26\u56de\u8c03\u51fd\u6570\u7684\u51fd\u6570\uff1a<br \/>\n<code>extern \"C\" _declspec(dllexport) void methodWithCallback(int (*fp)(int left, int right), int left, int right);<\/code><\/p>\n<\/li>\n<li>\n<p>Java\u91cc\u5b9a\u4e49\u4e00\u4e2a\u56de\u8c03\u63a5\u53e3<br \/>\n\u5fc5\u987b\u7ee7\u627f\u81ea<code>com.sun.jna.Callback<\/code>\u63a5\u53e3<\/p>\n<\/li>\n<\/ol>\n<pre><code>\n    public interface FunCallBack extends Callback {  \n        int invoke(int left, int right);  \n    }\n    <\/code><\/pre>\n<pre><code>`Invoke`\u65b9\u6cd5\u91cc\u7684\u53c2\u6570\u987a\u5e8f\u4e0eC\u51fd\u6570\u7684\u5bf9\u5e94\u3002\n<\/code><\/pre>\n<ol>\n<li>\u5b9a\u4e49\u56de\u8c03\u63a5\u53e3\u7684\u5b9e\u73b0<\/li>\n<\/ol>\n<pre><code>\n    public class CallbackFunImpl implements FunCallBack {  \n        @Override  \n        public int invoke(int left, int right) {  \n            System.out.printf(\"in java :%d + %d = %d\\n\", left, right, left + right);  \n            return left + right;  \n        }  \n    }\n    <\/code><\/pre>\n<ol>\n<li>\n<p>\u5728\u8868\u793a\u94fe\u63a5\u5e93\u5b9e\u73b0\u7684\u63a5\u53e3\u91cc\u5b9a\u4e49\u8981\u56de\u8c03\u7684\u672c\u5730\u51fd\u6570<br \/>\n<code>void methodWithCallback(Callback callback, int left, int right);<\/code><br \/>\n\u672c\u5730\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\u7528<code>Callback<\/code>\u63a5\u53e3\u66ff\u4ee3\u3002<\/p>\n<\/li>\n<li>\n<p>\u8c03\u7528\u5e26\u51fd\u6570\u6307\u9488\u7684\u672c\u5730\u51fd\u6570<br \/>\n<code>TestJnaLib.INSTANCE.methodWithCallback(new CallbackFunImpl(), 4, 6)<\/code><\/p>\n<\/li>\n<\/ol>\n<h2>JNA\u76f8\u5173\u77e5\u8bc6<\/h2>\n<p>\u4f7f\u7528JNA\u8c03\u7528\u539f\u751f\u51fd\u6570\u7684\u6a21\u5f0f\uff1a<\/p>\n<ul>\n<li>JNA\u4e0d\u4f7f\u7528<code>native<\/code>\u5173\u952e\u5b57\u3002<\/li>\n<li>JNI\u4f7f\u7528<code>native<\/code>\u5173\u952e\u5b57\uff0c\u4f7f\u7528\u4e00\u4e2ajava\u65b9\u6cd5\u6765\u4ee3\u8868\u5916\u90e8\u7684\u539f\u751f\u51fd\u6570\u3002<\/li>\n<li>JNA\u4f7f\u7528\u4e00\u4e2ajava\u63a5\u53e3\u6765\u4ee3\u8868\u4e00\u4e2a\u52a8\u6001\u94fe\u63a5\u5e93\u53d1\u5e03\u7684\u6240\u6709\u51fd\u6570\u3002<\/li>\n<li>\u5bf9\u4e8e\u4e0d\u9700\u8981\u7684\u539f\u751f\u51fd\u6570\uff0c\u53ef\u4ee5\u4e0d\u5728java\u63a5\u53e3\u4e2d\u58f0\u660ejava\u65b9\u6cd5\u539f\u578b\u3002 <\/li>\n<\/ul>\n<p>\u4f7f\u7528JNI\uff0c\u9700\u8981\u4f7f\u7528<code>System.loadLibrary<\/code>\u65b9\u6cd5\uff0c\u628a\u4e13\u95e8\u4e3aJNI\u7f16\u5199\u7684\u52a8\u6001\u94fe\u63a5\u5e93\u8f7d\u5165\u8fdb\u6765\uff0c\u8fd9\u4e2a\u52a8\u6001\u94fe\u63a5\u5e93\u5b9e\u9645\u4e0a\u662f\u771f\u6b63\u9700\u8981\u7684\u52a8\u6001\u94fe\u63a5\u5e93\u7684\u4ee3\u7406\u3002<\/p>\n<p>\u4f7f\u7528JNA\u7c7b\u5e93\u7684<code>Native<\/code>\u7c7b\u7684<code>loadLibrary<\/code>\u65b9\u6cd5\uff0c\u662f\u76f4\u63a5\u628a\u9700\u8981\u7684\u52a8\u6001\u94fe\u63a5\u5e93\u8f7d\u5165\u8fdb\u6765\u3002\u4f7f\u7528JNA\u4e0d\u9700\u8981\u7f16\u5199\u4f5c\u4e3a\u4ee3\u7406\u7684\u52a8\u6001\u94fe\u63a5\u5e93\uff0c\u4e0d\u9700\u8981\u7f16\u5199\u4e00\u884c\u539f\u751f\u4ee3\u7801\u3002<\/p>\n<p><strong>\u8de8\u5e73\u53f0\u3001\u8de8\u8bed\u8a00\u8c03\u7528\u539f\u5219\uff1a<\/strong><\/p>\n<ul>\n<li>\u5c3d\u91cf\u4f7f\u7528\u57fa\u672c\u3001\u7b80\u5355\u7684\u6570\u636e\u7c7b\u578b\uff1b<\/li>\n<li>\u5c3d\u91cf\u5c11\u8de8\u5e73\u53f0\u3001\u8de8\u8bed\u8a00\u4f20\u9012\u6570\u636e\uff01 <\/li>\n<\/ul>\n<p>Java\u8c03\u7528\u539f\u751f\u51fd\u6570\u65f6\uff0c\u4f1a\u628a\u6570\u636e\u56fa\u5b9a\u5728\u5185\u5b58\u4e2d\uff0c\u8fd9\u6837\u539f\u751f\u51fd\u6570\u624d\u53ef\u4ee5\u8bbf\u95ee\u8fd9\u4e9bJava\u6570\u636e\u3002\u8fd9\u4e9b\u6570\u636e\uff0cJVM\u7684GC\u4e0d\u80fd\u7ba1\u7406\uff0c\u4f1a\u9020\u6210\u5185\u5b58\u788e\u7247\u3002<\/p>\n<p>C\u8bed\u8a00\u7684\u7ed3\u6784\u4f53\u662f\u4e00\u4e2a\u4e25\u683c\u7684\u89c4\u8303\uff0c\u5b9a\u4e49\u4e86\u5185\u5b58\u7684\u6b21\u5e8f\u3002\u56e0\u6b64\uff0cJNA\u4e2d\u6a21\u62df\u7684\u7ed3\u6784\u4f53\u7684\u53d8\u91cf\u987a\u5e8f\u7edd\u5bf9\u4e0d\u80fd\u9519\u3002<\/p>\n<p>Java\u8c03\u7528\u52a8\u6001\u94fe\u63a5\u5e93\u4e2d\u7684C\u51fd\u6570\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u628a\u4e00\u6bb5\u5185\u5b58\u4f5c\u4e3a\u51fd\u6570\u7684\u53c2\u6570\u4f20\u9012\u7ed9C\u51fd\u6570\u3002\u52a8\u6001\u94fe\u63a5\u5e93\u4ee5\u4e3a\u8fd9\u4e2a\u53c2\u6570\u5c31\u662fC\u8bed\u8a00\u4f20\u8fc7\u6765\u7684\u53c2\u6570\u3002<\/p>\n<p><code>Structure<\/code>\u7c7b\u7684<code>write()<\/code>\u65b9\u6cd5\u4f1a\u628a\u7ed3\u6784\u4f53\u7684\u6240\u6709\u5b57\u6bb5\u56fa\u5b9a\u4f4f\uff0c\u662f\u539f\u751f\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u3002<\/p>\n<p>JNI\u6280\u672f\u662f\u53cc\u5411\u7684\uff0c\u65e2\u53ef\u4ee5\u4eceJava\u4ee3\u7801\u4e2d\u8c03\u7528\u539f\u751f\u51fd\u6570\uff0c\u4e5f\u53ef\u4ee5\u4ece\u539f\u751f\u51fd\u6570\u4e2d\u76f4\u63a5\u521b\u5efaJava\u865a\u62df\u673a\uff0c\u5e76\u8c03\u7528Java\u4ee3\u7801\u3002<\/p>\n<p>\u539f\u751f\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u51fd\u6570\u6307\u9488\u5b9e\u73b0\u51fd\u6570\u56de\u8c03\uff0c\u8c03\u7528\u5916\u90e8\u51fd\u6570\u6765\u6267\u884c\u4efb\u52a1\u3002\u8fd9\u5c31\u662f\u7b56\u7565\u6a21\u5f0f\u3002<\/p>\n<h4>Callback<\/h4>\n<p>\u4efb\u52a1\u56de\u8c03\u5b9a\u4e49\u5fc5\u987b\u7ee7\u627f\u81ea<code>com.sun.jna.Callback<\/code>\u63a5\u53e3\uff0c\u5b50\u7c7b\u5fc5\u987b\u5b9a\u4e49\u5355\u4e2a\u516c\u6709\u65b9\u6cd5\u6216\u4e00\u4e2a\u540d\u4e3acallback\u7684\u516c\u6709\u65b9\u6cd5\u3002\u5fc5\u987b\u6301\u6709\u5230\u56de\u8c03\u5bf9\u8c61\u7684\u4e00\u4e2a\u5b58\u6d3b\u5f15\u7528\u3002\u4e00\u4e2a\u56de\u8c03\u5e94\u8be5\u4e0d\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n<h4>com.sun.jna.Library<\/h4>\n<p>\u4ee3\u8868\u672c\u5730\u94fe\u63a5\u5e93\u7684\u5b9a\u4e49\u3002\u53ef\u7528\u5982\u4e0b\u5f62\u5f0f\u5b9a\u4e49\uff1a<br \/>\n<code>MyNativeLibrary INSTANCE = (MyNativeLibrary)Native.loadLibrary(\"mylib\", MyNativeLibrary.class);<\/code><\/p>\n<p>\u867d\u7136\u7ed3\u6784\u4f53\u548c\u7ed3\u6784\u4f53\u5b57\u6bb5\u7684\u540d\u5b57\u53ef\u4ee5\u662f\u4efb\u610f\u7684\uff0c\u4f46\u4ed6\u4eec\u5e94\u8be5\u5c3d\u53ef\u80fd\u63a5\u8fd1\u672c\u5730\u5b9a\u4e49\u3002\u53c2\u6570\u540d\u4e5f\u4e00\u6837\u3002\u6b64\u63a5\u53e3\u652f\u6301\u5728Java\u7aef\u591a\u7ebf\u7a0b\u3001\u5e76\u53d1\u8c03\u7528\u672c\u5730\u65b9\u6cd5\u3002\u5982\u679c\u672c\u5730\u7c7b\u5e93\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u53ef\u7528<code>Native.synchronizedLibrary(com.sun.jna.Library)<\/code>\u6765\u963b\u6b62\u591a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u672c\u5730\u4ee3\u7801\u3002<\/p>\n<p>\u94fe\u63a5\u5e93\u7684\u641c\u7d22\u8def\u5f84<\/p>\n<ul>\n<li><code>jna.library.path<\/code> \u7528\u6237\u5b9a\u4e49\u7684\u8def\u5f84\uff1b<\/li>\n<li><code>Jna.platform.library.path<\/code> \u5e73\u53f0\u5b9a\u4e49\u7684\u8def\u5f84\uff0c<\/li>\n<\/ul>\n<h4>com.sun.jna.Structure<\/h4>\n<p>\u4ee3\u8868\u672c\u5730\u7ed3\u6784\u4f53\u7684\u5bf9\u7b49Java\u7c7b\u3002<br \/>\n\u5f53\u4f5c\u4e3a\u53c2\u6570\u6216\u8fd4\u56de\u503c\u4f7f\u7528\u65f6\uff0c\u8fd9\u4e2a\u7c7b\u88ab\u4f20\u9012\u7ed9<code>struct *<\/code> (\u6307\u9488)\uff1b\u5f53\u4f5c\u4e3a\u53e6\u4e00\u4e2a\u7ed3\u6784\u4f53\u7684\u5b57\u6bb5\u65f6\uff0c\u5b83\u88ab\u4f20\u9012\u7ed9<code>struct<\/code> (\u503c\u4f20\u9012)\u3002<br \/>\n\u6807\u8bb0\u63a5\u53e3<code>Structure.ByReference<\/code>\u548c<code>Structure.ByValue<\/code>\u88ab\u7528\u6765\u63d0\u9192\u9ed8\u8ba4\u7684\u884c\u4e3a\u3002<\/p>\n<p>Structure\u5c5e\u6027\u4f20\u9012\u7ed9\u672c\u5730\u5b57\u6bb5\u5fc5\u987b\u662fpublic\u7684\u3002\u53ef\u4ee5\u7531\u4e0b\u9762\u53ef\u9009\u7684\u4fee\u9970\u7b26\uff1a<\/p>\n<ul>\n<li><code>volatile<\/code> : JNA\u4e0d\u4f1a\u4fee\u6539\u5b57\u6bb5\uff0c\u9664\u975e\u88ab\u8981\u6c42\uff0c\u901a\u8fc7<code>writeField(String)<\/code>\uff1b   <\/li>\n<li><code>final<\/code> :  JNA\u4f1a\u901a\u8fc7<code>read()<\/code>\u8986\u5199\u5b57\u6bb5\uff0c\u5b57\u6bb5\u5728java\u8fd9\u8fb9\u662f\u4e0d\u53ef\u53d8\u7684\u3002<\/li>\n<\/ul>\n<p><code>Structure<\/code>\u5c5e\u6027\u7684\u987a\u5e8f\u4e0e\u7c7b\u578b\u5fc5\u987b\u4e0e\u672c\u5730\u7ed3\u6784\u4f53\u7684\u5b57\u6bb5\u4e00\u4e00\u5bf9\u5e94\u3002<\/p>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u65f6\u5019Java\u9700\u8981\u901a\u8fc7\u8c03\u7528dll\u6765\u64cd\u4f5c\u5e95\u5c42\u7684\u786c\u4ef6\u6216\u8005\u73b0\u6709\u7684\u7ec4\u4ef6\uff0c\u76f4\u63a5\u4f7f\u7528JNI\u662f &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/java\/20110325\/50\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[20,19],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/50"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=50"}],"version-history":[{"count":6,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/50\/revisions"}],"predecessor-version":[{"id":56,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/50\/revisions\/56"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=50"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=50"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=50"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}