UTF-8 std::string to System::String^

[barnum]

Hi,

I have a std::string which I know is UTF-8 encoded. How can I make a
System::String^ from it?
I tried UTF8Encoding class, but it wants a Byte array, and I don't
know how to get that from a std::string.

Thanks for any help!

 

[jehugaleahsa]

Hi,

I have a std::string which I know is UTF-8 encoded. How can I make a
System::String^ from it?
I tried UTF8Encoding class, but it wants a Byte array, and I don't
know how to get that from a std::string.

Thanks for any help!

Since you know that your string is UTF-8, you need only be worried
that chars are 8-bits wide.

std::string s = "Hello, World";
char const* buffer = s.c_str();

From this point you can fill a Byte array. I am not totally sure how

to do this in Managed C++, but it should get you to where you are
going.

Outside of that I can't help you.

 

[Ben Voigt [C++ MVP]]

Since you know that your string is UTF-8, you need only be worried
that chars are 8-bits wide.

std::string s = "Hello, World";
char const* buffer = s.c_str();

to do this in Managed C++, but it should get you to where you are
going.

C++/CLI, not Managed C++

Add these lines to get a Byte array.

cli::array<System::Byte>^ a = gcnew cli::array<System::Byte>(s.length());
int i = s.length();
while (i-- > 0)
a = buffer;

And then use Encoding::UTF8::GetString(a);

 

[Giovanni Dicanio]

I have a std::string which I know is UTF-8 encoded. How can I make a
System::String^ from it?
I tried UTF8Encoding class, but it wants a Byte array, and I don't
know how to get that from a std::string.

To add to what others have written, I think that you could also convert the
string from Unicode UTF-8 to Unicode UTF-16 inside C++, using
::MultiByteToWideChar Win32 API.
Then, you can pass the resulting Unicode UTF-16 string value to
System::String (so, in this way you bypass UTF8Encoding class).

Giovanni

 

[barnum]

Since you know that your string is UTF-8, you need only be worried
that chars are 8-bits wide.

std::string s = "Hello, World";
char const* buffer = s.c_str();
to do this in Managed C++, but it should get you to where you are
going.

C++/CLI, not Managed C++

Add these lines to get a Byte array.

cli::array<System::Byte>^ a = gcnew cli::array<System::Byte>(s.length());
int i = s.length();
while (i-- > 0)
a = buffer;

And then use Encoding::UTF8::GetString(a);

Outside of that I can't help you.- Skjul sitert tekst -

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- Vis sitert tekst -

Thanks, that worked!