2013/10/31 Ruben Van Boxem <[email protected]>
> Use this to get a wstring, then call c_str() and you have a const wchar_t*:
>
> const wstring convert_to_utf16(const string& utf8_string)
> {
> // get length
> int length = MultiByteToWideChar(CP_UTF8, 0, utf8_string.c_str(),
> static_cast<int>(utf8_string.size()), nullptr, 0);
> if(!(length > 0))
> return wstring();
> else
> {
> wstring result;
> result.resize(static_cast<string::size_type>(length));
>
> if(MultiByteToWideChar(CP_UTF8, 0, utf8_string.c_str(),
> static_cast<int>(utf8_string.size()),
> &result[0], static_cast<int>(result.size())) == 0 )
> throw runtime_error("Failure to execute toUTF16: conversion failed.");
> else
> return result;
> }
> }
>
>
Or much simpler if you need no Unicode correctness and the string is indeed
plain ASCII:
std::wstring f(const std::string& oldstring)
{
std::wstring result;
result.reserve(oldstring.size());
std::copy(oldstring.begin(), oldstring.end(), std::back_inserter(result));
return result;
}
And then use either c_str() or data() on the resulting wstring if you need
a (const) wchar_t*.
Ruben
>
>
>
> 2013/10/31 Incongruous <[email protected]>
>
>> Does anyone know of a way to convert a string to a 'const wchar_t*'
>> I need this conversion for the 3rd parameter in MessageBox(...).
>> MessageBox(NULL,
>> apstr.c_str(), // Thius works
>> (const wchar_t*)this->getMessage().c_str(),// getMessage()
>> returns a std:string, it does not work!!
>> MB_OK);
>>
>> TIA
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Android is increasing in popularity, but the open development platform
>> that
>> developers love is also attractive to malware creators. Download this
>> white
>> paper to learn more about secure code signing practices that can help keep
>> Android apps secure.
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk
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>>
>
>
------------------------------------------------------------------------------
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developers love is also attractive to malware creators. Download this white
paper to learn more about secure code signing practices that can help keep
Android apps secure.
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