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POSending parameters to java via c++
 

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    <p>My java class has a static function defined as follows:</p> <pre><code>public static void logEvent(final String eventName, final String jObject) { //Function data } </code></pre> <p>Now my cpp file has the following function</p> <pre><code>void PingoScreen::callApslarIntegration(){ char* eventName="bingo"; JniMethodInfo t; if (JniHelper::getStaticMethodInfo(t, "com/myapp/test/ApslarSetup","logEvent", "()V")) { t.env-&gt;CallStaticVoidMethod(t.classID, t.methodID); t.env-&gt;DeleteLocalRef(t.classID); } } </code></pre> <p>How can i send two string params to the JAVA function via JNI ?</p> <p>Kind Regards</p> <p>===============================================================</p> <pre><code>void PingoScreen::callApsIntegration() { JniMethodInfo t; if (JniHelper::getStaticMethodInfo(t, "com/myapp/test/ApslarSetup", "logJSONEvent", "()V")) { const char* cstr1 = "Test1"; const char* cstr2 = "Test2"; jstring jstr1 = t.env-&gt;NewStringUTF(cstr1); jstring jstr2 = t.env-&gt;NewStringUTF(cstr2); t.env-&gt;CallStaticVoidMethod(t.classID, t.methodID,jstr1,jstr2); t.env-&gt;DeleteLocalRef(t.classID); } } </code></pre> <p>The above function causes a crash ?</p> <p>==================================</p> <p>Finally got it to work</p> <pre><code>void PingoScreen::callApslarIntegration() { JniMethodInfo t; if (JniHelper::getStaticMethodInfo (t, "com/nbs/test/ApslarSetup", "logJSONEvent", "(Ljava/lang/String;Ljava/lang/String;)V")) { const char* cstr1 = "Test1"; const char* cstr2 = "Test2"; jstring jstr1 = t.env-&gt;NewStringUTF(cstr1); jstring jstr2 = t.env-&gt;NewStringUTF(cstr2); t.env-&gt;CallStaticVoidMethod(t.classID, t.methodID,jstr1,jstr2); t.env-&gt;DeleteLocalRef(t.classID); } } </code></pre> <p>The crash was due to the line</p> <pre><code>if (JniHelper::getStaticMethodInfo (t, "com/nbs/test/ApslarSetup", "logJSONEvent", "(Ljava/lang/String;Ljava/lang/String;)V")) </code></pre> <p>The signiture had to be <code>Ljava/lang/String;Ljava/lang/String;</code> and not <code>Ljava/lang/String;Ljava/lang/String</code> (notice the last semi-colon)</p>
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    1. COTip: Use `javap -s -public com.nbs.test.ApslarSetup | egrep -A 2 "logJSONEvent"` to obtain signatures to use with JNI.
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      1. USTom Blodget
 

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