C++ DLL special characters

Question

I'm sending an user-generated string from my program into a C++ DLL function I'm making. It works fine, until I send a string like "åäö". My function looks something like this:

export void showMessage(char* str) {
    MessageBox(NULL, str, "DLL says", MB_OK);
}

When "åäö" is sent from the program, a message with "åäö" popups up. How do I convert it into "åäö"? What library is needed? I'm using Code::Blocks for the DLL.

Answer 1

The characters you are using appear to be in the extended ASCII table (value greater than 127), and will depend on the code page you are using, which is a less than portable approach, since the system running your code needs to make environment changes outside of the program itself.

Instead of using MessageBox , use the Unicode enabled version, MessageBoxW , and look up the Unicode encodings for the characters you specified.

References

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1. Unicode Versions and ANSI Versions of Functions , Accessed 2014-06-06, <http://zone.ni.com/reference/en-XX/help/371361J-01/lvexcodeconcepts/unicode_ansi_version_functs/>
2. ASCII Table Lookup , Accessed 2014-06-06, <http://www.theasciicode.com.ar/extended-ascii-code/capital-letter-a-ring-uppercase-ascii-code-143.html>
3. Unicode Lookup , Accessed 2014-06-06, <http://unicodelookup.com/>