用Java怎么调用C语言已经编写好的DLL? java程序能直接调用C写好的dll文件吗?
\u7528Java\u600e\u4e48\u8c03\u7528C\u8bed\u8a00\u5df2\u7ecf\u7f16\u5199\u597d\u7684DLL\uff1f\u76f4\u63a5\u7528\uff0c\u662f\u7528\u4e0d\u4e86\u7684\uff0cjava\u548cC\u7684\u63a5\u53e3\u53ebJNI\uff0c\u5fc5\u987b\u4f7f\u7528jni\u6765\u4ea4\u4e92\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4f60\u5fc5\u987b\u6709C\u5f00\u53d1\u4eba\u5458\u7ed9\u4f60\u5305\u88c5\u4f60\u60f3\u7528\u7684dll
JAVA\u901a\u8fc7JNI\u8c03\u7528\u672c\u5730\u65b9\u6cd5\uff0c\u800c\u672c\u5730\u65b9\u6cd5\u662f\u4ee5\u5e93\u6587\u4ef6\u7684\u5f62\u5f0f\u5b58\u653e\u7684\uff08\u5728WINDOWS\u5e73\u53f0\u4e0a\u662fDLL\u6587\u4ef6\u5f62\u5f0f\uff0c\u5728UNIX\u673a\u5668\u4e0a\u662fSO\u6587\u4ef6\u5f62\u5f0f\uff09\u3002\u901a\u8fc7\u8c03\u7528\u672c\u5730\u7684\u5e93\u6587\u4ef6\u7684\u5185\u90e8\u65b9\u6cd5\uff0c\u4f7fJAVA\u53ef\u4ee5\u5b9e\u73b0\u548c\u672c\u5730\u673a\u5668\u7684\u7d27\u5bc6\u8054\u7cfb\uff0c\u8c03\u7528\u7cfb\u7edf\u7ea7\u7684\u5404\u63a5\u53e3\u65b9\u6cd5\u3002
\u7b80\u5355\u4ecb\u7ecd\u53ca\u5e94\u7528\u5982\u4e0b\uff1a
\u4e00\u3001JAVA\u4e2d\u6240\u9700\u8981\u505a\u7684\u5de5\u4f5c
\u5728JAVA\u7a0b\u5e8f\u4e2d\uff0c\u9996\u5148\u9700\u8981\u5728\u7c7b\u4e2d\u58f0\u660e\u6240\u8c03\u7528\u7684\u5e93\u540d\u79f0\uff0c\u5982\u4e0b\uff1a
static {
System.loadLibrary(\u201cgoodluck\u201d);
}
\u5728\u8fd9\u91cc\uff0c\u5e93\u7684\u6269\u5c55\u540d\u5b57\u53ef\u4ee5\u4e0d\u7528\u5199\u51fa\u6765\uff0c\u7a76\u7adf\u662fDLL\u8fd8\u662fSO\uff0c\u7531\u7cfb\u7edf\u81ea\u5df1\u5224\u65ad\u3002
\u8fd8\u9700\u8981\u5bf9\u5c06\u8981\u8c03\u7528\u7684\u65b9\u6cd5\u505a\u672c\u5730\u58f0\u660e\uff0c\u5173\u952e\u5b57\u4e3anative\u3002\u5e76\u4e14\u53ea\u9700\u8981\u58f0\u660e\uff0c\u800c\u4e0d\u9700\u8981\u5177 \u4f53\u5b9e\u73b0\u3002\u5982\u4e0b\uff1a
public native static void set(int i);
public native static int get();
\u7136\u540e\u7f16\u8bd1\u8be5JAVA\u7a0b\u5e8f\u6587\u4ef6\uff0c\u751f\u6210CLASS\uff0c\u518d\u7528JAVAH\u547d\u4ee4\uff0cJNI\u5c31\u4f1a\u751f\u6210C/C++\u7684\u5934\u6587\u4ef6\u3002
\u4f8b\u5982\u7a0b\u5e8ftestdll.java\uff0c\u5185\u5bb9\u4e3a\uff1a
public class testdll
{
static
{
System.loadLibrary("goodluck");
}
public native static int get();
public native static void set(int i);
public static void main(String[] args)
{
testdll test = new testdll();
test.set(10);
System.out.println(test.get());
}
}
\u7528javac testdll.java\u7f16\u8bd1\u5b83\uff0c\u4f1a\u751f\u6210testdll.class\u3002
\u518d\u7528javah testdll\uff0c\u5219\u4f1a\u5728\u5f53\u524d\u76ee\u5f55\u4e0b\u751f\u6210testdll.h\u6587\u4ef6\uff0c\u8fd9\u4e2a\u6587\u4ef6\u9700\u8981\u88abC/C++\u7a0b\u5e8f\u8c03\u7528\u6765\u751f\u6210\u6240\u9700\u7684\u5e93\u6587\u4ef6\u3002
参考资料: http://hi.baidu.com/dinguangx/blog/item/196560017e40e2031c95832f.html
1.用System.getProperty("user.dir"),获取程序的路径,估计你的应该是 E:\\测试程序不清楚打印一下就可以了。System.getProperty("user.dir") + "\\DLL\\CardAPI"2.unsigned char 用char就可以了unsigned int 用int就可以了,java的int值很大.....C的无符号的记得是65535 unsigned char*、和unsigned int* 这两个是指针,第一个是取1位地址内容的,第二个根据系统而定,一般是取4位地址值的,用java 的String对应,应该可以 。
我使用过的是 JNative。具体使用方法见:http://ejb-wawa.javaeye.com/blog/188662
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