P
PengYu.UT
Hi,
Would you tell me what callback function is used? Why we need it? I
searched the web. But most webpages only mention that how to use it but
not why to use it.
Best wishes,
Peng
Would you tell me what callback function is used? Why we need it? I
searched the web. But most webpages only mention that how to use it but
not why to use it.
Best wishes,
Peng