size_t WritebackFunc(char *ptr, size_t size, size_t nmemb, wxString *userdata);
int ProgressFunc(void *clientdata, double TTDown, double NDown, double TTUp, double NUp);
size_t WritebackFunc(char *ptr, size_t size, size_t nmemb, wxString *userdata);
int ProgressFunc(void *clientdata, double TTDown, double NDown, double TTUp, double NUp);