IDL corba中的数组和对象错误

Question

我在IDL corba中遇到了数组和对象的问题这是我的代码:

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

和错误当我编译它:

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);

谁来帮帮我!!!!!!!!!!!!!!!!!!!!

Answer 1

CORBA语言规范不允许返回任何类型的数组，除非它们首先类型定义。

你在这里有两个选项可用-固定数组或sequences -后者更灵活，允许数组大小由实现代码设置。

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);
};

注意不要将Java语法与IDL语法混淆:string显示为所有小写。