BigFileMessageClass 0 0 661 211 BigFileMessage 3 3 3 6 TextLabel Open Mode Binary Open,load in blocks, and turn pages manually. Big Text true Open directly in text mode.May be slow, Need wait. Text Mode Hex Bin Big Text File(< 8G) Read only open, load in blocks, and turn pages manually. Super big Text File(> 8G bits) Read only open, load in blocks, and turn pages manually. Super Big Text Qt::Horizontal 40 20 Ok Cancel okBt clicked() BigFileMessageClass slot_okBt() 359 168 284 193 cancelBt clicked() BigFileMessageClass slot_cancelBt() 448 176 446 196 slot_okBt() slot_cancelBt()