c - 扩展鼠标点击事件 - C

Question

目前我正在检测鼠标点击的 x 和 y 位置，将其存储在 Point 中并通过消息框显示。

我希望能够读取是否按住了另一个键盘键，例如 Shift 或 Control 按钮。

查看MSDN我发现了以下信息:

wParam Indicates whether various virtual keys are down. This parameter can be one or more of the following values.

MK_CONTROL The CTRL key is down.

MK_MBUTTON The middle mouse button is down.

MK_RBUTTON The right mouse button is down.

MK_SHIFT The SHIFT key is down.

MK_XBUTTON1 Windows 2000/XP: The first X button is down.

MK_XBUTTON2 Windows 2000/XP: The second X button is down.

我遇到的问题是我不确定如何为每个参数存储 wParam 的结果并使用它们，就像我必须通过消息框显示它们一样。

这是我目前的进展:

LRESULT CALLBACK WindowFunc(HWND hMainWindow, UINT message,
    WPARAM wParam, LPARAM lParam)
{
 POINTS mouseXY;
 WCHAR buffer[256];

    // Act on current message
    switch(message)    
    {
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 case WM_LBUTTONUP:
  // Get mouse x, y
  mouseXY = MAKEPOINTS(lParam);

  // Output the co-ordinates
  swprintf(buffer, 255, L"x = %d, y = %d", mouseXY.x, mouseXY.y);
  MessageBox(0, buffer, L"Mouse Position", MB_OK);
  break;
    default:
        return DefWindowProc(hMainWindow, message, wParam, lParam);
    }
    return 0;
}

感谢帮助

Answer 1

不同的虚拟键在wParam 中被或运算在一起。要检查单个值，您必须将它们与运算(想想基本的位操作)。

例子:

swprintf(buffer, 255, L"x = %d, y = %d, Shift = %s, Ctrl = %s",
         mouseXY.x, mouseXY.y,
         wParam & MK_SHIFT ? L"yes" : L"no",
         wParam & MK_CONTROL ? L"yes" : L"no");