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<TD class=title_side align=middle height=20><A class=channel
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target=_blank>http://www.qqread.com/</A> 作者：yippit 2005-11-01 来源：csdn 浏览：
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<TD class=height170><FONT class=f14
id=zoom> <BR> 在有了这两个头文件之后，就可以进行C程序的编写了。也就是实现对JNI调用的两个方法。在网上的资料中，由于调用的方法实现的都比较简单，（大多是打印字符串等）所以避开了JNI中最麻烦的部分，也是最关键的部分，参数的传递。
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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的编码是不同的，所以传递的参数是要进行再处理，否则C程序是会对参数在编译过程中提出警告，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)->GetArrayLength(env,mobileno); <BR>jbyte * arrayBody =
(*env)->GetByteArrayElements(env,mobileno,0); <BR>char *
pMobileNo = (char *)arrayBody; <BR>printf("[%s]\n ", pMobileNo);
<BR>//jsize size = (*env)->GetArrayLength(env,smscontent);
<BR>arrayBody = (*env)->GetByteArrayElements(env,smscontent,0);
<BR>pSmscontent = (char *)arrayBody; <BR>printf("<%s>\n", pSmscontent); <br> return SmsSend(pMobileNo,pSmscontent); <br>}</p> <br><br> 对于C或<a href="http://www.qqread.com/keywords/cpp.html" target="_blank">C++</a>，在程序上是会有稍微的不同，这可以由读者对其进行适当的修改。这里要注意的是GetArrayLength，GetByteArrayElements等这些JNI中已经包含的方法，这些方法是专门对转换参数类型而提供的。具体的方法有很多，在下一篇中会做专门的介绍。<br> 在完成了上述的文件后，可以对sms.c进行编译，生成.dll文件（建议在release中编译，这样动态链接库的容积会比较小！）<br> 完成.dll文件的编译后，就可以在Java中调用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>⌨️ 快捷键说明
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