sdl事件是諸如按鍵，滑鼠移動，操縱按鈕按下之類的東西。
在內部，sdl將所有等待處理的事件儲存在事件佇列中。首選方式是使用sdl_pollevent()接收系統事件。它可以從主迴圈完成，並且在等待事件發布時不會掛起主迴圈。如果佇列上沒有事件，則返回0，否則返回1。
定義是否退出的標誌isquit初始值設定為0，表示不退出。
我們使用while迴圈依次處理每個事件，直到遇到sdl_quit事件，退出迴圈結束程序。
int isquit =0;
while
(!isquit)
}printf
("event queue empty.\n"
);
sdl_event user_event;
user_event.type = sdl_userevent;
user_event.user.code =2;
user_event.user.data1 =
null
;user_event.user.data2 =
null
;sdl_pushevent
(&user_event)
;
event type
event structure
sdl_event field
sdl_audiodeviceadded sdl_audiodeviceremoved
sdl_audiodeviceevent
adevice
sdl_controlleraxismotion
sdl_controlleraxisevent
caxis
sdl_controllerbuttondown sdl_controllerbuttonup
sdl_controllerbuttonevent
cbutton
sdl_controllerdeviceevent
cdevice
sdl_dollargesture sdl_dollarrecord
sdl_dollargestureevent
dgesture
sdl_dropfile sdl_droptext sdl_dropbegin sdl_dropcomplete
sdl_dropevent
drop
sdl_fingermotion sdl_fingerdown sdl_fingerup
sdl_touchfingerevent
tfinger
sdl_keydown sdl_keyup
sdl_keyboardevent
key
sdl_joyaxismotion
sdl_joyaxisevent
jaxis
sdl_joyballmotion
sdl_joyballevent
jball
sdl_joyhatmotion
sdl_joyhatevent
jhat
sdl_joybuttondown sdl_joybuttonup
sdl_joybuttonevent
jbutton
sdl_joydeviceadded sdl_joydeviceremoved
sdl_joydeviceevent
jdevice
sdl_mousemotion
sdl_mousemotionevent
motion
sdl_mousebuttondown sdl_mousebuttonup
sdl_mousebuttonevent
button
sdl_mousewheel
sdl_mousewheelevent
wheel
sdl_multigesture
sdl_multigestureevent
mgesture
sdl_quit
sdl_quitevent
quit
sdl_syswmevent
sdl_syswmevent
syswm
sdl_textediting
sdl_texteditingevent
edit
sdl_textinput
sdl_textinputevent
text
sdl_userevent
sdl_userevent
user
sdl_windowevent
sdl_windowevent
window
other events
sdl_commonevent
none, use .type
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