using MultiByteToWideChar function

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I want to convert c++ code into c#, but with the following function MultiByteToWideChar, the first parameter codepage:
the first parameter has been ast as CP_ACP in c++, but when I use it in c#, then it is said that CP_ACP does not exist in current context. what have I missed here?

MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0);

Posted 8-Jul-12 6:13am

Seraph_summer

Updated 8-Jul-12 6:26am

v4

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Comments

[no name] 8-Jul-12 12:15pm

Strings in .NET are all unicode

Sergey Alexandrovich Kryukov 8-Jul-12 14:37pm

Right, and, by that reason, I don't think this call can be useful in a .NET application.
--SA

Seraph_summer 9-Jul-12 15:08pm

you are right!! thanks a lot!

perilbrain 8-Jul-12 13:14pm

If you are using CP_ACP directly, then it is senseless.....
See in the definition header the unsigned integer value for CP_ACP.

Seraph_summer 9-Jul-12 15:08pm

you are right!! thanks a lot!

4 solutions

Solution 1

try using

C++

MultiByteToWideChar(0, 0, str, -1, NULL, 0);

and let us know if it still doesn't recognizes.

Posted 8-Jul-12 7:18am

perilbrain

Comments

Seraph_summer 9-Jul-12 15:06pm

thanks a lot, actually, I found later that I do not need this function in .net.

Solution 3

You might use GetACP[^] function instead of CP_ACP constant.

Posted 9-Jul-12 0:06am

CPallini

Comments

Seraph_summer 9-Jul-12 15:07pm

thanks a lot, actually, I found later that I do not need this function in .net.

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armagedescu · Accepted Answer · 2012-07-09T00:01:00

Solution 2

If this string is already UNICODE, then it is already wide char. Just be sure that your str in C# is multibyte (probably char array or ASCII) and not unicode. Such unicode string you may only convert back to multibyte with vice versa WideCharToMultiByte.

Posted 9-Jul-12 0:01am

armagedescu

Comments

Seraph_summer 9-Jul-12 15:07pm

thanks a lot, you are right!!

Richard MacCutchan · Accepted Answer · 2012-07-09T00:27:00

Solution 4

I do not think that function exists in the standard .NET framework, so you should use the System.Text.Encoding[^] class.

Posted 9-Jul-12 0:27am

Richard MacCutchan

Comments

Seraph_summer 9-Jul-12 15:05pm

thanks a lot!
you proposal is a good solution!

Richard MacCutchan 9-Jul-12 15:12pm

Thanks, happy to help.