char p[20];
char* buffer_float=p;
GetDlgItemTextA(hDlg,IDC_EDIT6,LPSTR(p),20);
char* end_ptr;
double val =0;
val=atof(buffer_float);

val=strtod(buffer_float,&end_ptr);
float perem_float=0;

perem_float =(float)val;
DWORD leng;
WriteFile(hFile,&perem_float,sizeof(perem_float),& leng,NULL);
CloseHandle(hFile);
break;