java - IDL corba 中的数组和对象错误

Question

我在 IDL corba 中遇到数组和对象问题 这是我的代码:

    interface ISinhVien
{
    SinhVien[] DocFile(in String filename);
    void GhiFile(in SinhVien[] sv,in String filename);
};

编译时出错:

CORBA_SinhVien>idlj -fall SinhVienIDL.idl
SinhVienIDL.idl (line 3):  SinhVien is an undeclared type.
        SinhVien[] DocFile(in String filename);
         ^
SinhVienIDL.idl (line 3):  Expected `<identifier>'; encountered `['.
        SinhVien[] DocFile(in String filename);
         ^
SinhVienIDL.idl (line 3):  WARNING: Identifier `String' collides with a keyword;
 use an escaped identifier to ensure future compatibility.
        SinhVien[] DocFile(in String filename);
                       ^
SinhVienIDL.idl (line 4):  SinhVien is an undeclared type.
        void GhiFile(in SinhVien[] sv,in String filename);
                         ^
SinhVienIDL.idl (line 4):  Expected `<identifier>'; encountered `['.
        void GhiFile(in SinhVien[] sv,in String filename);
                         ^
SinhVienIDL.idl (line 4):  WARNING: Identifier `String' collides with a keyword;
 use an escaped identifier to ensure future compatibility.
        void GhiFile(in SinhVien[] sv,in String filename);

谁能帮帮我，拜托!!!!!!!!!!!!!!!!!!!!!

Answer 1

CORBA language specification不允许返回任何类型的数组，除非它们首先是类型定义的。

这里有 2 个选项可用 - 固定数组或序列 - 后者更灵活，允许通过实现代码设置数组大小。

interface SinhVien {
  boolean someOperation(in long id);
  // more operations
};

typedef sequence<SinhVien> sinhviens;


interface ISinhVien
{
    sinhviens docFile(in string filename);
    void ghiFile(in sinhviens sv, in string filename);
};

旁白:请注意不要将 Java 语法与 IDL 语法混合:string 显示为全部小写。