How to convert char* to wchar_t*?

Question

I've tried implementing a function like this, but unfortunately it doesn't work:

const wchar_t *GetWC(const char *c) {     const size_t cSize = strlen(c)+1;     wchar_t wc[cSize];     mbstowcs (wc, c, cSize);      return wc; } 

My main goal here is to be able to integrate normal char strings in a Unicode application. Any advice you guys can offer is greatly appreciated.

Answer 1

In your example, wc is a local variable which will be deallocated when the function call ends. This puts you into undefined behavior territory.

The simple fix is this:

const wchar_t *GetWC(const char *c) {     const size_t cSize = strlen(c)+1;     wchar_t* wc = new wchar_t[cSize];     mbstowcs (wc, c, cSize);      return wc; } 

Note that the calling code will then have to deallocate this memory, otherwise you will have a memory leak.