Passing by ref?

[asnowfall]

I am calling a function with a reference parameter. Inside the function
(GetXMLRecord)
I am changing the input parameter. When the function returns, input
parameter is not reflecting the change. This would have worked in C++,
but not here

What I am doing wrong? Pls help.
ref class ImageFileData
{
public NameValueCollec tion^ m_pNameValueCol lection;
public:
ImageFileData()
{
m_pNameValueCol lection = gcnew NameValueCollec tion;
}
int GetXMLRecord( NameValueCollec tion^ data)
{
if(m_pNameValue Collection->Count)
{
data = m_pNameValueCol lection; ///VALUE set here to "data" does
not get

///here will not carried to caller
}
return 0;
}
}
public ref class Test : public System::Windows ::Forms::Form
{
ImageFileData^ m_pImageFileDat a;
}
void Test :: initControlsFro mXML( )
{
NameValueCollec tion^ objCustomData ;
m_pImageFileDat a->GetXMLRecord ( objCustomData); //////VALUE set
inside function does
//not hold good when the function returns
}

[Willy Denoyette [MVP]]

<as*******@gmai l.com> wrote in message
news:11******** **************@ o13g2000cwo.goo glegroups.com.. .
|I am calling a function with a reference parameter. Inside the function
| (GetXMLRecord)
| I am changing the input parameter. When the function returns, input
| parameter is not reflecting the change. This would have worked in C++,
| but not here
|
| What I am doing wrong? Pls help.
|
|
| ref class ImageFileData
| {
| public NameValueCollec tion^ m_pNameValueCol lection;
| public:
| ImageFileData()
| {
| m_pNameValueCol lection = gcnew NameValueCollec tion;
| }
| int GetXMLRecord( NameValueCollec tion^ data)
| {
| if(m_pNameValue Collection->Count)
| {
| data = m_pNameValueCol lection; ///VALUE set here to "data" does
| not get
|
| ///here will not carried to caller
| }
| return 0;
| }
| }
|
|
| public ref class Test : public System::Windows ::Forms::Form
| {
| ImageFileData^ m_pImageFileDat a;
| }
| void Test :: initControlsFro mXML( )
| {
| NameValueCollec tion^ objCustomData ;
| m_pImageFileDat a->GetXMLRecord ( objCustomData); //////VALUE set
| inside function does
| //not hold good when the function returns
| }
|

GetXMLRecord(Na meValueCollecti on^% data)
or
GetXMLRecord([Runtime::Intero pServices::Out]NameValueCollec tion^% data)
Willy.

[Greg]

> GetXMLRecord(Na meValueCollecti on^% data)

or you can simply use:
GetXMLRecord(Na meValueCollecti on^%#&@* data)

:-)

Just a little humor about how out of hand the syntax is getting. :-)

--
Greg McPherran
www.McPherran.com

[Tamas Demjen]

Greg wrote:

GetXMLRecord( NameValueCollec tion^% data)

or you can simply use:
GetXMLRecord(Na meValueCollecti on^%#&@* data)

:-)

Just a little humor about how out of hand the syntax is getting. :-)

Why do you say that? In native C++ it was *&. Now it's ^%. You have to
be able to differenciate between native pointers and managed handles.
Not like in the old MC++ hell, when you had absolutely no idea what the
* was meaning.

Would it be better to write

GetXMLRecord(Na meValueCollecti on __gc* __gc& data)

???

Tom