小编Ami*_*oei的帖子

我正在使用该GlobalMemoryStatusEx函数来检索有关内存的信息,但此功能无法正常工作.它为所有属性返回0.我不认为这个功能在我的Windows 7环境中有效.

    [StructLayout(LayoutKind.Sequential)]
    internal struct MEMORYSTATUSEX
    {
        internal uint dwLength;
        internal uint dwMemoryLoad;
        internal ulong ullTotalPhys;
        internal ulong ullAvailPhys;
        internal ulong ullTotalPageFile;
        internal ulong ullAvailPageFile;
        internal ulong ullTotalVirtual;
        internal ulong ullAvailVirtual;
        internal ulong ullAvailExtendedVirtual;
    }
    [return: MarshalAs(UnmanagedType.Bool)]
    [DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    internal static extern bool GlobalMemoryStatusEx(ref MEMORYSTATUSEX lpBuffer);

    private void btnGlobalMemoryStatusEX_Click(object sender, EventArgs e)
    {
        MEMORYSTATUSEX statEX = new MEMORYSTATUSEX();
        GlobalMemoryStatusEx(ref statEX);

        double d = (double)statEX.ullTotalPhys;
    }

任何人都可以告诉我错误的代码出错了吗？

任何人都可以告诉我,我可以将Hibernate实体作为JAXWS Web服务方法中的返回值返回!

的确,我有一些这样的实体:

@Entity
public class Parent {
...
    private Childone childoneByChildoneid;    
    @ManyToOne
    public
    @javax.persistence.JoinColumn(name="ChildOneId",referencedColumnName="Id")
    Childone getChildoneByChildoneid() {
        return childoneByChildoneid;
    }    
    public void setChildoneByChildoneid(Childone childoneByChildoneid) {
        this.childoneByChildoneid = childoneByChildoneid;
    }
...
}

@Entity
public class Childone {
...
    private Collection<Parent> parentsById;
    @OneToMany(mappedBy = "childoneByChildoneid")
    public Collection<Parent> getParentsById() {
        return parentsById;
    }
    public void setParentsById(Collection<Parent> parentsById) {
        this.parentsById = parentsById;
    }
...
}

并有这样的服务:

@Stateless
@WebService()
public class MasterDataService {
    @EJB
    private MasterDataManager manager;
    @WebMethod
    public Parent getParent(int parentId) {
        return …

我试图在sybase中定义一个函数.我写这个脚本:

CREATE FUNCTION GetUserGroup (userId int)
RETURNS int
BEGIN
    RETURN (10)
END

但是当我运行它时,我收到此错误:

>[Error] Script lines: 1-6 --------------------------
 Incorrect syntax near the keyword 'BEGIN'.
 Msg: 156, Level: 15, State: 2
 Server: NEWSERVER, Procedure: GetUserGroup, Line: 3 

>[Error] Script lines: 1-6 --------------------------
 A RETURN statement with a return status may only be used in a SQL stored procedure.
 Msg: 178, Level: 15, State: 1
 Server: NEWSERVER, Procedure: GetUserGroup, Line: 4 

 [Executed: 10/13/09 11:01:29 AM IRST ] [Execution: 0/ms] 

我能做什么？谢谢

当我想在C#中获取内存总值时,我在MSDN中找到了一个kernel32函数来调用系统中的数据.MSDN以这种方式声明函数:

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern bool GlobalMemoryStatusEx(ref MEMORYSTATUSEX lpBuffer);

但这不能正常工作.我将"ref"改为"[In,Out]"然后它正常工作.怎么能告诉我C#中的[In,Out]参数是什么？