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

**jehugaleahsa@gmail.com** · Oct 19 '07, 07:05 PM

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

On Oct 19, 12:43 pm, bar...@bluezone .no wrote:

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]** · Oct 19 '07, 08:15 PM

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

<jehugaleahsa@g mail.comwrote in message
news:1192820470 .187763.240190@ t8g2000prg.goog legroups.com...

On Oct 19, 12:43 pm, bar...@bluezone .no wrote:

>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.

C++/CLI, not Managed C++

Add these lines to get a Byte array.

cli::array<Syst em::Byte>^ a = gcnew cli::array<Syst em::Byte>(s.len gth());
int i = s.length();
while (i-- 0)
a[i] = buffer[i];

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

>
Outside of that I can't help you.
>

**Giovanni Dicanio** · Oct 19 '07, 10:05 PM

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

<barnum@bluezon e.noha scritto nel messaggio
news:1192819417 .018640.229780@ i13g2000prf.goo glegroups.com.. .

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
::MultiByteToWi deChar 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@bluezone.no** · Oct 20 '07, 11:45 AM

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

On 19 Okt, 22:06, "Ben Voigt [C++ MVP]" <r...@nospam.no spamwrote:

<jehugalea...@g mail.comwrote in message
>
news:1192820470 .187763.240190@ t8g2000prg.goog legroups.com...
>
>
>
>
>

On Oct 19, 12:43 pm, bar...@bluezone .no wrote:

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.

>
C++/CLI, not Managed C++
>
Add these lines to get a Byte array.
>
cli::array<Syst em::Byte>^ a = gcnew cli::array<Syst em::Byte>(s.len gth());
int i = s.length();
while (i-- 0)
a[i] = buffer[i];
>
And then use Encoding::UTF8: :GetString(a);
>
>
>
>
>

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

>
- Vis sitert tekst -- Skjul sitert tekst -
>
- Vis sitert tekst -

Thanks, that worked!

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

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

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