请问一个关于输入特殊字符的问题
比如有个窗体Form1，Caption为“A”，窗体上有个Edit1，我想实现在Edit1里按顺序按下键盘上的特殊字符“上下左右”键后，Form1的Caption变为“B”,请问应该怎么实现？万分感谢！

[解决办法]

C/C++ code

void __fastcall TForm1::Edit1KeyUp(TObject *Sender, WORD &Key,      TShiftState Shift){    static nFlag = 0;    if (Key == VK_UP && nFlag == 0)        nFlag = 1;    else if (Key == VK_DOWN && nFlag == 1)        nFlag = 2;    else if (Key == VK_LEFT && nFlag == 2)        nFlag = 4;    else if (Key == VK_RIGHT && nFlag == 4)        nFlag = 8;    else        nFlag = 0;    Caption = nFlag == 8? "B": "A";}