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...

Maybe I'll have some better ideas after some hours of sleep or someone else comes along saying "aaah, that's simple!"... 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.