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            <H1>Java: JNI完全手冊</H1></FONT></TH></TR>
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            target=_blank>http://www.qqread.com/</A>&nbsp;作者：yippit&nbsp;2005-11-01&nbsp;來源：csdn&nbsp;瀏覽：
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          <TD vAlign=bottom align=right><A 
            href="http://www.qqread.com/java/w120282060_2.html">上一頁</A>&nbsp;<A 
            href="http://www.qqread.com/java/w120282060.html">1</A>&nbsp;<A 
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          <TD class=height170><FONT class=f14 
            id=zoom>　　<BR>　　在有了這兩個頭文件之后，就可以進行C程序的編寫了。也就是實現(xiàn)對JNI調(diào)用的兩個方法。在網(wǎng)上的資料中，由于調(diào)用的方法實現(xiàn)的都比較簡單，（大多是打印字符串等）所以避開了JNI中最麻煩的部分，也是最關(guān)鍵的部分，參數(shù)的傳遞。
            <TABLE style="MARGIN: 10px 8px 3px 7px" cellSpacing=0 cellPadding=0 
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                <TD><SPAN id=ad_qqread_mid_big></SPAN></TD></TR></TBODY></TABLE>由于<A 
            href="http://www.qqread.com/keywords/java.html" 
            target=_blank>Java</A>和C的編碼是不同的，所以傳遞的參數(shù)是要進行再處理，否則C程序是會對參數(shù)在編譯過程中提出警告，例如；warning 
            C4024: 'SmsSend' : different types for formal and actual parameter 
            2等。<BR>　　Sms.c的程序如下：<BR>
            <P class=code>#include "sms.h" <BR>#include 
            "com_mobilesoft_sms_mobilesoftinfo_SendSMS.h" <BR>JNIEXPORT jint 
            JNICALL 
            Java_com_mobilesoft_sms_mobilesoftinfo_SendSMS_SmsInit(JNIEnv * env, 
            jclass jobject) <BR>{ <BR>return SmsInit(); <BR>} <BR><BR>JNIEXPORT 
            jint JNICALL 
            Java_com_mobilesoft_sms_mobilesoftinfo_SendSMS_SmsSend(JNIEnv * env, 
            jclass jobject, jbyteArray mobileno, jbyteArray smscontent) <BR>{ 
            <BR>char * pSmscontent ; <BR>//jsize theArrayLengthJ = 
            (*env)-&gt;GetArrayLength(env,mobileno); <BR>jbyte * arrayBody = 
            (*env)-&gt;GetByteArrayElements(env,mobileno,0); <BR>char * 
            pMobileNo = (char *)arrayBody; <BR>printf("[%s]\n ", pMobileNo); 
            <BR>//jsize size = (*env)-&gt;GetArrayLength(env,smscontent); 
            <BR>arrayBody = (*env)-&gt;GetByteArrayElements(env,smscontent,0); 
            <BR>pSmscontent = (char *)arrayBody; <BR>printf("<%s>\n", pSmscontent); <br>    return SmsSend(pMobileNo,pSmscontent);  <br>}</p> <br><br>　　對于C或<a href="http://www.qqread.com/keywords/cpp.html" target="_blank">C++</a>，在程序上是會有稍微的不同，這可以由讀者對其進行適當(dāng)?shù)男薷摹＿@里要注意的是GetArrayLength，GetByteArrayElements等這些JNI中已經(jīng)包含的方法，這些方法是專門對轉(zhuǎn)換參數(shù)類型而提供的。具體的方法有很多，在下一篇中會做專門的介紹。<br>　　在完成了上述的文件后，可以對sms.c進行編譯，生成.dll文件（建議在release中編譯，這樣動態(tài)鏈接庫的容積會比較小！）<br>　　完成.dll文件的編譯后，就可以在Java中調(diào)用C程序中的方法了。例如文件test.java<br><p class="code">public class test { <br>  public test() { <br>  } <br>  public static void main(String[] args) { <br>    byte[] mobileno = { <br>        0x31, 0x33, 0x36, 0x36, 0x31, 0x36, 0x33, 0x30, 0x36, 0x36, 0x37, 0x00}; <br>    String smscontentemp = "早上好"; <br>    byte[] temp = {0}; <br>   try { <br>
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