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<TD class=height170><FONT class=f14
id=zoom> <BR> 我的项目比较复杂，需要调用动态链接库，这样在JNI传送参数到C程序时，需要对参数进行处理转换。才可以被C程序识别。<BR> 大体程序如下：<BR>
<P class=code>public class SendSMS { <BR>static <BR>{ <BR>
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<TD><SPAN
id=ad_qqread_mid_big></SPAN></TD></TR></TBODY></TABLE>System.out.println(System.getProperty("java.library.path"));
<BR>System.loadLibrary("sms"); <BR>} <BR>public native static int
SmsInit(); <BR>public native static int SmsSend(byte[] mobileNo,
byte[] smContent);
<BR>}</P><BR><BR> 在这里要注意的是，path里一定要包含类库的路径，否则在程序运行时会抛出异常：<BR> java.lang.UnsatisfiedLinkError:
no sms in java.library.path<BR> at
java.lang.ClassLoader.loadLibrary(ClassLoader.java:1491)<BR> at
java.lang.Runtime.loadLibrary0(Runtime.java:788)<BR> at
java.lang.System.loadLibrary(System.java:834)<BR> at
com.mobilesoft.sms.mobilesoftinfo.SendSMS.<CLINIT>(SendSMS.java:14)<BR> at
com.mobilesoft.sms.mobilesoftinfo.test.main(test.java:18)<BR> Exception
in thread
"main"<BR><BR> 指引的路径应该到.dll文件的上一级，如果指到.dll，则会报：<BR> java.lang.UnsatisfiedLinkError:
C:\sms.dll: Can't find dependent libraries<BR> at
java.lang.ClassLoader$NativeLibrary.load(Native Method)<BR> at
java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1560)<BR> at
java.lang.ClassLoader.loadLibrary(ClassLoader.java:1485)<BR> at
java.lang.Runtime.loadLibrary0(Runtime.java:788)<BR> at
java.lang.System.loadLibrary(System.java:834)<BR> at
com.mobilesoft.sms.mobilesoftinfo.test.main(test.java:18)<BR> Exception
in thread
"main"<BR><BR> 通过编译，生成com_mobilesoft_sms_mobilesoftinfo_SendSMS.h头文件。（建议使用Jbuilder进行编译，操作比较简单！）这个头文件就是Java和C之间的纽带。要特别注意的是方法中传递的参数jbyteArray，这在接下来的过程中会重点介绍。<BR>
<P class=code>/* DO NOT EDIT THIS FILE - it is machine generated */
<BR>#include <JNI.H><BR>/* Header for class
com_mobilesoft_sms_mobilesoftinfo_SendSMS */ <BR>#ifndef
_Included_com_mobilesoft_sms_mobilesoftinfo_SendSMS <BR>#define
_Included_com_mobilesoft_sms_mobilesoftinfo_SendSMS <BR>#ifdef
__cplusplus <BR>extern "C" { <BR>#endif <BR>/* <BR>* Class:
com_mobilesoft_sms_mobilesoftinfo_SendSMS <BR>* Method: SmsInit
<BR>* Signature: ()I <BR>*/ <BR>JNIEXPORT jint JNICALL
Java_com_mobilesoft_sms_mobilesoftinfo_SendSMS_SmsInit <BR>(JNIEnv
*, jclass); <BR>/* <BR>* Class:
com_mobilesoft_sms_mobilesoftinfo_SendSMS <BR>* Method: SmsSend
<BR>* Signature: ([B[B)I <BR>*/ <BR>JNIEXPORT jint JNICALL
Java_com_mobilesoft_sms_mobilesoftinfo_SendSMS_SmsSend <BR>(JNIEnv
*, jclass, jbyteArray, jbyteArray); <BR>#ifdef __cplusplus <BR>}
<BR>#endif
<BR>#endif</P><BR><BR> 对于我要调用的C程序的动态链接库，C程序也要提供一个头文件，sms.h。这个文件将要调用的方法罗列了出来。<BR>
<P class=code>/* <BR>* SMS API <BR>* Author: yippit <BR>* Date:
2004.6.8 <BR>*/ <BR>#ifndef MCS_SMS_H <BR>#define MCS_SMS_H
<BR>#define DLLEXPORT __declspec(dllexport) <BR>/*sms storage*/
<BR>#define SMS_SIM 0 <BR>#define SMS_MT 1 <BR>/*sms states*/
<BR>#define SMS_UNREAD 0 <BR>#define SMS_READ 1 <BR>/*sms type*/
<BR>#define SMS_NOPARSE -1 <BR>#define SMS_NORMAL 0 <BR>#define
SMS_FLASH 1 <BR>#define SMS_MMSNOTI 2 <BR>typedef struct tagSmsEntry
{ <BR>int index; /*index, start from 1*/ <BR>int status; /*read,
unread*/ <BR>int type; /*-1-can't parser 0-normal, 1-flash, 2-mms*/
<BR>int storage; /*SMS_SIM, SMS_MT*/ <BR>char date[24]; <BR>char
number[32]; <BR>char text[144]; <BR>} SmsEntry; <BR>DLLEXPORT int
SmsInit(void); <BR>DLLEXPORT int SmsSend(char *phonenum, char
*content); <BR>DLLEXPORT int SmsSetSCA(char *sca); <BR>DLLEXPORT int
SmsGetSCA(char *sca); <BR>DLLEXPORT int SmsSetInd(int ind);
<BR>DLLEXPORT int SmsGetInd(void); <BR>DLLEXPORT int SmsGetInfo(int
storage, int *max, int *used); <BR>DLLEXPORT int SmsSaveFlash(int
flag); <BR>DLLEXPORT int SmsRead(SmsEntry *entry, int storage, int
index); <BR>DLLEXPORT int SmsDelete(int storage, int index);
<BR>DLLEXPORT int SmsModifyStatus(int storage, int index); /*unread
-> read*/ <BR>#endif</P><BR><BR
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