Convert the char to an wchar_t

[Schoppy]

Hi,
I have a Problem. I must convert an Char to an wchar_t.

My Sytem: Code::Blocks 1 RC2 + MinGW + WindowsXP



void DLL_EXPORT * DEMOText(
                                char Text,
                                int iTopX, int iTopY, int iBotX, int iBotY,
                                bool boBorder)

{
// Convert the char(Text) to an wchar_t ???????


       return (void *)guienv->addStaticText(
            Text, //<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< this must a wchar_t
            rect<int>(iTopX, iTopY, iBotX+iTopX, iBotY+iTopY),
            boBorder);

}



Sorry for my bad English :-)
Can someone help me ?


Thanks
Schoppy

[TDragon]

I see you're using Irrlicht; a quick Google for "Irrlicht and wchar_t" turned up the mbstowcs function. Here's a quick question: do you really only want to pass a single character to your DEMOText function (that's what you're doing), rather than a string? Since I doubt you do, following is an improved version that should do what you want.

Code Select Expand


#include <cstdio>
#include <cstdlib>


IGUIStaticText* DLL_EXPORT DEMOText(char const* Text,
                                    int iX,
                                   int iY,
                                   int iWidth,
                                   int iHeight,
                                   bool boBorder)
{
    size_t alloc_len = strlen(Text) + 1;
    wchar_t* wc_out = new wchar_t[alloc_len];
    size_t result = mbstowcs(wc_out, Text, alloc_len);

    IGUIStaticText* ret_val = 0;
    if (result > 0)
    {
        ret_val = guienv->addStaticText(Text,
         rect< int >(iX, iY, iX + iWidth, iY + iHeight),
         boBorder);
    }

    delete[] wc_out;
    return ret_val;
}


[kelo81]

The irrclicht string implementation already has support for converting between both formats I think (char* and w_char*), I tried to assign some values between stringw and stringc and it works fine! The mbstowcs could be helpful for unique char operations.

[TDragon]

The irrclicht string implementation already has support for converting between both formats I think (char* and w_char*), I tried to assign some values between stringw and stringc and it works fine! The mbstowcs could be helpful for unique char operations.

Thanks for jumping in! I've never used Irrlicht on a regular basis, and wasn't aware of its string class.

Code Select Expand


IGUIStaticText* DLL_EXPORT DEMOText(char const* Text,
                                    int iX,
                                    int iY,
                                    int iWidth,
                                    int iHeight,
                                    bool boBorder)
{
    core::stringw wc_text(Text);
    return guienv->addStaticText(wc_text.c_str(),
     rect< int >(iX, iY, iX + iWidth, iY + iHeight),
     boBorder);
}


[Schoppy]

Thats it. Thank you for your help. 

[dgrafix]

Hi thanks for posting this, however, why is this needed?
delete[] wc_out;


Unless its returning the pointer shouldnt it automatically get dumped on function return?

[Deschamps]

however, why is this needed? delete[] wc_out;

AFAIK, all the dynamicly reserved memory *must* be explicitly unassigned using 'delete' for avoiding memory leaks, and obviously it must be done while the object is accesible (i.e. before returning the function).