jstring -> type name / unexpected expression

Flaming Moe

Hello there,

am trying to call a static Java method which takes a string as argument.

QJniObject string1 = QJniObject::fromString(song);
    QJniObject::callStaticMethod<void>(
                    "org/qtproject/example/androidnotifier/MusicPlayer",
                    "play",
                    "(Ljava/lang/String;)I" ,
                    string1.object()<jstring>());

I´m getting the error "unexpected type name 'jstring': expected expression" and can´t figure out, if I´m missing to include a library or something else.

Has someone an idea?

ChrisW67

I think the last line is a little too parentheses-heavy:

QJniObject string1 = QJniObject::fromString(song);
QJniObject::callStaticMethod<void>(
                  "org/qtproject/example/androidnotifier/MusicPlayer",
                  "play",
                  "(Ljava/lang/String;)I" ,
                  string1.object<jstring>());

Flaming Moe

@ChrisW67
There is one thing i´m defenetly doing wrong I see now - the 'I' behind the
(Ljava/lang/String;)
is wrong, since I call a void-return method.

QJniObject string1 = QJniObject::fromString(song);
    QJniObject::callStaticMethod<void>(
                    "org/qtproject/example/androidnotifier/MusicPlayer",
                    "play",
                    "(Ljava/lang/String;)I" ,
                    string1.object()<jstring>());

May be there is a flaw in the example .
In the c-code part of the following is a comma after the method name "fromNumber"

// C++ code
QJniObject stringNumber = QJniObject::callStaticObjectMethod("org/qtproject/qt/TestClass",
                                                             "fromNumber",
                                                             "(I)Ljava/lang/String;", 10);

while here isn´t a comma after "stringArray"

// C++ code
QJniObject string1 = QJniObject::fromString("String1");
QJniObject string2 = QJniObject::fromString("String2");
QJniObject stringArray = QJniObject::callStaticObjectMethod<jstringArray>(
                                                            "org/qtproject/qt/TestClass",
                                                            "stringArray"
                                                            string1.object<jstring>(),
                                                            string2.object<jstring>());

ChrisW67

@Flaming-Moe Yes, that is a missing comma in the documentation. Feel free to raise a bug if you cannot find it already reported.

Flaming Moe

@ChrisW67 Even after your former post I haven´t noticed the wrong paranthesis after my ".object" until yesterday evening after staring at goats for a loooong time