Class, char array, error

[MX]

Welcome!

I have something like that:

ref class DCAM
{
...
private:
char str[64];
...

};

And in main program:

DCAM^ CAM = gcnew DCAM();
CAM->str[0] = 'a';
this->Text = gcnew System::String(Cam->str);

After compilation I got:
error C2664: 'System::String::String(const wchar_t *)' : cannot convert
parameter 1 from 'char [64]' to 'const wchar_t *'
1> Cannot convert a managed type to an unmanaged type

Thanks for any help.

 

[Bruno van Dooren]

DCAM^ CAM = gcnew DCAM();
CAM->str[0] = 'a';
this->Text = gcnew System::String(Cam->str);

Check this out, it might help you:
http://www.codeproject.com/managedcpp/StringConvertor.asp

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"

 

[Arnaud Debaene]

Welcome!

I have something like that:

ref class DCAM
{
...
private:
char str[64];
...

};

And in main program:

DCAM^ CAM = gcnew DCAM();
CAM->str[0] = 'a';
this->Text = gcnew System::String(Cam->str);

After compilation I got:
error C2664: 'System::String::String(const wchar_t *)' : cannot
convert parameter 1 from 'char [64]' to 'const wchar_t *'
1> Cannot convert a managed type to an unmanaged type

Thanks for any help.

Managed code always work in Unicode, so you can't directly convert from char
to String. Use System::Runtime::Interop::Marshal:trToStringAnsi.

Arnaud
MVP - VC

 

[Holger Grund]

Managed code always work in Unicode, so you can't directly convert from
char to String. Use System::Runtime::Interop::Marshal:trToStringAnsi.

It's probably also worth mentioning that C++'s char translates
to System::Byte and the C++ alias for System::Char is
wchar_t.

-hg