rc = SendMessage(Form1.ActiveControl.hwnd, WM_CHAR,"A", 1)
rc = SendMessage(Form1.ActiveControl.hwnd, WM_C
阅读背景：
rc = SendMessage(Form1.ActiveControl.hwnd, WM_CHAR,"A", 1) 為什麼接收的是一串的"A"，而非單個？
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