用windowsAPI编程,怎样在创建的窗口中显示变量的值?
为什么以下不行?
char *str;
int m=0;
for(int i=0;i<5;i++)
{
sprintf(str,"%c",(char)i);
SendMessage(hwnd, WM_MYMESSAGE, NULL, NULL);
m+=20;
}
case WM_MYMESSAGE:
hdc=GetDC(hwnd);
TextOut(hdc,1,m,str,strlen(str));
ReleaseDC(hwnd,hdc);
break;