ERROR - from 'std::string' to 'System::Runtime::Serialization::SerializationInfo ^'

[krosty4782]

Hi all.
Im having a problem when i make my program.
The code is:

string ja = "jaja";
ListViewItem item1 = gcnew ListViewItem(ja,0 );
listView1->Items->Add(item1);

And it gives me the following error:

: error C2664: 'System::Windows::Forms::ListViewItem::ListViewItem(System::Runtime::Serialization::SerializationInfo ^,System::Runtime::Serialization::StreamingContext)' : cannot convert parameter 1 from 'std::string' to 'System::Runtime::Serialization::SerializationInfo ^'
1> No user-defined-conversion operator available, or
1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
1>c:\users\mauri\documents\visual studio 2008\projects\mauri\mauri\Form1.h(192) : error C2664: 'System::Windows::Forms::ListViewItem ^System::Windows::Forms::ListView::ListViewItemCollection::Add(System::String ^)' : cannot convert parameter 1 from 'System::Windows::Forms::ListViewItem' to 'System::String ^'
1> No user-defined-conversion operator available, or
1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called


Thanks

[Eri523]

The error message you get is misleading to some extent, but the bottom line seems to be that there is no ListViewItem constructor that takes an std::string as the first parameter.

One possible solution might be to construct a temporary System::String object from the std::string. As there is a System::String constructor that takes a char *, something like this might work:


ListViewItem item1 = gcnew ListViewItem(gcnew String(ja.c_str()),0 );


But why are you involving an std::string at all? Is this a native/managed interop scenario?

HTH

[krosty4782]

I tried what you have putted and it didnt work.
Im really lost with this... i know how to program in c++ but im trying to use visual studio for the graphic interface and im really lost :s

[Eri523]

Ok, then it looks like we need to see some more sample code demonstrating the problem and/or error messages. Can you post some more? We certainly can't help you just using imagination... ;)

[krosty4782]

Well what i want is to put an item in a listview, but this item need to have a variable as name.
So i create the listview

private: System::Windows::Forms::ListView^ listView1;

Then i inizialize

this->listView1 = (gcnew System::Windows::Forms::ListView());

//
// listView1
//
this->listView1->BackColor = System::Drawing::SystemColors::Window;
this->listView1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
this->listView1->Columns->AddRange(gcnew cli::array< System::Windows::Forms::ColumnHeader^ >(2) {this->columnHeader2, this->columnHeader3});
this->listView1->ForeColor = System::Drawing::SystemColors::InfoText;
this->listView1->Location = System::Drawing::Point(12, 67);
this->listView1->Name = L"listView1";
this->listView1->Size = System::Drawing::Size(260, 97);
this->listView1->TabIndex = 0;
this->listView1->UseCompatibleStateImageBehavior = false;
this->listView1->View = System::Windows::Forms::View::Details;

And finally i do this to add the item:

String ja = "jaja";
ListViewItem item1 = gcnew ListViewItem(ja);
listView1->Items->Add(item1);

The strange is that if i do "ListViewItem item1 = gcnew ListViewItem("text");" there is no problem, so the problem is in the variable i think i have to define it as another type.

In msdn i ve found this:

Initializes a new instance of the ListViewItem class with the specified item text.
ListViewItem (
String^ text
)

So, if i put String^ ja = "jaja" instead of String ja = "jaja" the error is:

error C2664: 'System::Windows::Forms::ListViewItem::ListViewItem(System::String ^)' : cannot convert parameter 1 from 'System::Windows::Forms::ListViewItem ^' to 'System::String ^'
1> No user-defined-conversion operator available, or
1> Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

Thanks =)

[Eri523]

So, if i put String^ ja = "jaja" instead of String ja = "jaja" the error is:

[...]

Hmmm, I would have expected at least that to work, or using an implicitly dereferenced variable (i.e. String ja = "jaja";) and take its tracking handle using the % operator. And the error message you are getting for that puzzles me even more... :confused:

Maybe I'll have some better ideas after some hours of sleep or someone else comes along saying "aaah, that's simple!"... :D But for now I'm stuck too...

[Zaccheus]

Have you tried:


String^ ja = gcnew String(L"jaja");
ListViewItem^ item1 = gcnew ListViewItem(ja);
listView1->Items->Add(item1);


Note the added ^ symbols.