Windows CE: 通过Application实现对鼠标光标的隐藏和显示的控制

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在FreeScalei.MX51平台上，定义全局变量以决定是否显示光标，并初始化该变量及创建监控光标状态的线程。通过驱动指令自定义光标隐藏与显示操作，实现灵活的光标控制。测试光标状态通过调用特定的ioctl函数进行，以确保界面交互的顺畅。

平台FreeScale i.MX51

1. Define a global variable to determine if show the cursor

C:/WINCE600/PLATFORM/COMMON/SRC/SOC/COMMON_FSL_V2/IPUV3/DDRAW/ddipu.h

class DDIPU : public DDGPE

{
    protected:
           BOOL            m_bCursorHide;
.. .


2. Init the m_bCursorHide and create a thread to monitor cursor state

C:/WINCE600/PLATFORM/COMMON/SRC/SOC/COMMON_FSL_V2/IPUV3/DDRAW/ddipu.cpp

BOOL DDIPU::Init(VOID)

{
           m_bCursorHide = TRUE; // Hide cursor as default state

3. According m_bCursorHide, decide to do DDIPU::CursorOn or not.

C:/WINCE600/PLATFORM/COMMON/SRC/SOC/COMMON_FSL_V2/IPUV3/DDRAW/ddipu_cursor.cpp

VOID DDIPU::CursorOn(VOID)
{
...
           If (m_bCursorHide)
           {
                     // do nothing..
           }
           else
           {
                     // handle the cursor state..
           }
...
}

4. add wistron custom ioctl in the DrvEscape()

C:/WINCE600/PLATFORM/COMMON/SRC/SOC/COMMON_FSL_V2/IPUV3/DDRAW/ddipu_misc.cpp

#define DDIPU_CURSOR_HIDE     100100

#define DDIPU_CURSOR_SHOW 100101

ULONG DDIPU::DrvEscape(..)
{..
    switch(iEsc)
    {
     ...
           case DDIPU_CURSOR_HIDE:
                     m_bCursorHide = TRUE;
                     break;
            case DDIPU_CURSOR_SHOW:
                      m_bCursorHide = FALSE;
                     break;
    ..
..
}

5. Test the ioctl in the app

#define DDIPU_CURSOR_HIDE     100100

#define DDIPU_CURSOR_SHOW 100101

HDC hdc;
hdc = GetDC(hWnd);
ExtEscape(hdc, DDIPU_CURSOR_SHOW, 0, NULL, 0, NULL); // Show cursor

ExtEscape(hdc, DDIPU_CURSOR_HIDE, 0, NULL, 0, NULL);
ReleaseDC(hWnd, hdc);