swprintf в MinGW

wchar_t s[300];
int i=10;
swprintf(s, 20, "%i",i);

setvbuf(F1,s,_IOLBF,sizeof(s));

char s[20004];
 
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
 
 
 
{
 
 
setlocale(LC_ALL, "");
 
 long int t=GetTickCount();
 
 
//   FILE *F1=fopen("e:\\txt\\gros_8.txt","rt, ccs=UTF-8");
//   FILE *F2=fopen("e:\\txt\\gros_88.txt","w, ccs=UTF-8");
 
 
 
   FILE *F1=fopen("e:\\txt\\gros_8.txt","r");
   FILE *F2=fopen("e:\\txt\\gros_88.txt","w");
 
 
 
   int n=0;
 
   while (n<1)
   {
 
 
   while (!feof(F1))
 
//     fputws(fgetws(s,1000,F1),F2);
//   fputs(fgets((char*)s,1000,F1),F2);
 
{fread(s,sizeof(char),20000,F1);
fwrite(s,sizeof(char),20000,F2);
}
 
 
   fseek(F1,SEEK_SET,0);
 
    n++;
   }
 
 
  fclose(F1);
  fclose(F2);
 
 
  t=GetTickCount()-t;
 
  F1=fopen("e:\\tst\\tim_test.txt","a+t");
  fprintf(F1,"%i\n",t);
  fclose(F1);
 
 
 
  return 0;
 
}

wchar_t s[501];
 
FILE *F1=fopen("e:\\txt\\gros_16.txt","rt");
fgets((char*)s,500,F1);
MessageBoxW(0,s,L"",0);

wchar_t s[501];
FILE *F1=fopen("e:\\txt\\gros_8.txt","rt, ccs=UTF-8");
fgetws(s,500,F1);
MessageBoxW(0,s,L"",0);