这是什么错误?C ++到Java，帮助！！！ [英] what's this error???C++ to java ,help!!!!

问题描述

//this''s jni function in dll;

JNIEXPORT jstring JNICALL Java_vc_CallVc_getActiveWindowTitle//get title
(JNIEnv * jn, jclass)
{
             jstring str;
            const char *strTitle     =GetStringUTFChars( str , 0);
           ::GetWindowText(::GetForegroundWindow(),(LPSTR)strTitle,MAX_PATH);
             char  srtMsg[MAX_PATH];
            sprintf(srtMsg,this dialog title is:%s,strTitle);
            AfxMessageBox(strTitle);
            jn->ReleaseStringChars(str,0);
            return  (jstring)strTitle;//error  ???
}

//me demo dialog function for vc++2005


void CJniSparkDlg::OnBnClickedCancel6()
{
    // TODO: Add your control notification handler code here
    JNIEnv *a;
    jclass c;
    Java_vc_CallVc_screenCameraShot(a,c);
}

代码编译成功，但是出现运行时错误.你能帮我吗?
:sigh::sigh:
请给我发邮件:*删除邮件*
谢谢.

The code compiles successfully, but I get a runtime error. Can you help me?
:sigh: :sigh:
Please send me a mail: *REMOVED MAIL*
Thank you.

推荐答案

如果您发布(a)您正在使用的Java和(b)人们可能有什么帮助，那是什么错误呢? .

我对JNI一无所知，但是您是否考虑过在第二遍代码中您使用的是未初始化的变量?

在第一个块中，您还将const指针转换为非const(取决于是否有空，取决于GetStringUTFChars的语义).
干杯，

Ash

If you post (a) the Java you''re using and (b) what the error is people might be able to help a bit more.

I don''t know anything about JNI but have you considered that in the second lump of code you''re using an uninitialised variable?

In the first lump you also cast a const pointer to a non-const (which may or may not be a no-no, depends on the semantics of GetStringUTFChars).

Cheers,

Ash

没人帮我吗?????:confused:

Nobody help me ?????:confused:

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