尝试获取字段ID时Android Jni出错

Question

我想获取签名数组，这是PackageInfo的一个字段。

我的C ++代码是（LOGD是一个用于记录的宏）：

jclass PackageInfoClass = pEnv->FindClass("android/content/pm/PackageInfo");
if(PackageInfoClass == NULL) {
    LOGD("class PackageInfoClass not found");
    abort();
}
LOGD("class PackageInfoClass found");

jfieldID SignaturesFieldID = pEnv->GetFieldID(PackageInfoClass, "signatures",
        "[Landroid.content.pm.Signature;");
if(SignaturesFieldID == NULL) {
    LOGD("field SignaturesFieldID not found");
    abort();
}
LOGD("field SignaturesFieldID found");

在我的日志中，我收到消息“字段SignaturesFieldID not found”