将单字节Char转化为双字节的wchar_t的转换函数

1 wchar_t* c2w(const char *str)
2 {
3      int length = strlen(str)+1;
4      wchar_t *t = (wchar_t*)malloc(sizeof(wchar_t)*length);
5      memset(t,0,length*sizeof(wchar_t));
6      MultiByteToWideChar(CP_ACP,0,str,strlen(str),t,length);
7      return t;
8 }