Visualstudio之C#实现数字输⼊模拟键盘
背景
当前做的⼀个上位机需运⾏在⼯控机上，众所周知，⼯控机不可能配备键盘，只能是触屏，⽽我当前的上位机需要输⼊参数，于是之前的解决办法既是调⽤Windows⾃带的虚拟键盘，⽅法在我的另⼀外⼀篇博客中已详述，但这种做法有两个致命缺陷，⼀是由于调⽤了外部.exe程序，国产杀毒软件会将我的上位机判定为疑似病毒⽂件（⼿动微笑）；⼆是，若是该虚拟键盘被提前打开，我就没办法继续打开该软键盘使其在我的上位机界⾯之上，⽽该软键盘不是由我打开，我就获取不到它的Process，也就⽆法将其关闭重新打开，⼯控机的界⾯通常不会出现任务栏，因此虚拟键盘要是没有实体键盘就永远⽆法打开，头疼⾄极。于是就想到⾃⼰实现软键盘。便有此⽂，做个记录。
⾸先强调⼀下，本软键盘⾮真正意义的软键盘，只是⽤了很笨的⽅法在同⼀个界⾯上提供了⼀个数字输⼊的解决⽅案，实际效果如下：
正⽂
为了不让按键在点击的时候获取焦点，所以我采⽤了label控件，⼀共12个控件，分别是9，退格，清除，对应的name分别
为,keyb0,keyb1,```keb9,keybback,keybclear，对应的Text就是相应的0,9，退格，清除，为了调整所有按键⼤⼩，属性Autosize应该设置为false。
在窗体Load事件中，添加所有label控件的单击事件mybutton_clicked，
private void lazerctrl_Load(object sender, EventArgs e)
{
// 注册键盘按键单击事件
keyb1.Click += new EventHandler(mybutton_clicked);
keyb2.Click += new EventHandler(mybutton_clicked);
keyb3.Click += new EventHandler(mybutton_clicked);
keyb4.Click += new EventHandler(mybutton_clicked);
keyb5.Click += new EventHandler(mybutton_clicked);
keyb6.Click += new EventHandler(mybutton_clicked);
keyb7.Click += new EventHandler(mybutton_clicked);
keyb8.Click += new EventHandler(mybutton_clicked);
keyb9.Click += new EventHandler(mybutton_clicked);
keyb0.Click += new EventHandler(mybutton_clicked);
keybback.Click += new EventHandler(mybutton_clicked);
keybclear.Click += new EventHandler(mybutton_clicked);
}
在⿏标按键事件中，将控件代表的数字值，填⼊到页⾯上最后⼀个获取到焦点的TextBox，内。这个lastfocustextbox 后⾯说明，
// 执⾏按键操作
void mybutton_clicked(object sender, EventArgs e)
{
Label clickbtn = (Label)sender;
string strkey = clickbtn.Text;
if ((lastfocustextbox == textBoxmhpU) || (lastfocustextbox == textBoxmhpD)
|| (lastfocustextbox == textBoxCWhpU) || (lastfocustextbox == textBoxCWhpD)
|| (lastfocustextbox == textBoxmptU) || (lastfocustextbox == textBoxmptD)
|| (lastfocustextbox == textBoxCWptU) || (lastfocustextbox == textBoxCWptD))
{//不可编辑的textbox就跳过
}
else
{
if (strkey == "退格")
{
string strNew = this.lastfocustextbox.Text;
if (strNew.Length >= 1)
{
strNew = strNew.Substring(0, strNew.Length - 1);
this.lastfocustextbox.Text = strNew;
this.lastfocustextbox.SelectionStart = this.lastfocustextbox.Text.Length;
}
this.lastfocustextbox.Focus();
}
else if (strkey == "清除")
{
lastfocustextbox.Clear();
}
else
{
lastfocustextbox.AppendText(strkey);
}
}
}
为了获知当前聚焦在哪个TextBox，就需要在窗体Load事件注册所有TextBox的Enter事件，并在事件中将最后⼀次获得聚焦的TextBox赋值给前⽂提及的lastfocustextbox 中，所以我说这是笨⽅法。: )
private void lazerctrl_Load(object sender, EventArgs e)
{
// 注册textbox获取焦点事件
textBoxmp.Enter += new EventHandler(text_getfocused);
textBoxhz.Enter += new EventHandler(text_getfocused);
textBoxduty.Enter += new EventHandler(text_getfocused);
textBoxmlpU.Enter += new EventHandler(text_getfocused);
textBoxmtU.Enter += new EventHandler(text_getfocused);
textBoxmlpD.Enter += new EventHandler(text_getfocused);
textBoxmtD.Enter += new EventHandler(text_getfocused);
textBoxCWp.Enter += new EventHandler(text_getfocused);
textBoxCWlpU.Enter += new EventHandler(text_getfocused);
textBoxCWtU.Enter += new EventHandler(text_getfocused);
textBoxCWlpD.Enter += new EventHandler(text_getfocused);
textBoxCWtD.Enter += new EventHandler(text_getfocused);
textBoxalertt.Enter += new EventHandler(text_getfocused);
textBoxintervalt.Enter += new EventHandler(text_getfocused);
textBoxmhpU.Enter += new EventHandler(text_getfocused);
textBoxmhpD.Enter += new EventHandler(text_getfocused);
textBoxCWhpU.Enter += new EventHandler(text_getfocused);
textBoxCWhpD.Enter += new EventHandler(text_getfocused);
textBoxmptU.Enter += new EventHandler(text_getfocused);
textBoxmptD.Enter += new EventHandler(text_getfocused);
textBoxCWptU.Enter += new EventHandler(text_getfocused);
textBoxCWptD.Enter += new EventHandler(text_getfocused);
}
此处注意lastfocustextbox 在窗体导⼊时，⼀定要赋值⼀个默认的TextBox，否则在未有⼀个TextBox获取焦点的情况下，⽤户点击按键，导致操作null，抛出异常，甚⾄直接使UI异常关闭。
// 声明
private System.Windows.Forms.TextBox lastfocustextbox;
// 赋初始值
lastfocustextbox = textBoxintervalt;
// 获取最后⼀次获取焦点的Textbox
void text_getfocused(object sender, EventArgs e)
{
TextBox focuedbox = (TextBox)sender;
lastfocustextbox = focuedbox;
}
⾄此，按键的功能就可以实现了，但Lable毕竟不是按键，没有Button的效果，所以我们可以继续的为lable注册⿏标按下和弹起事件，在该事件内改变lable的边框，颜⾊，甚⾄是图⽚，使其有按键按下和弹起的效果，特别可以选⼀些按键按下和弹起的图⽚，那样效果会相当不错。同样，在窗体Load事件注册事件
private void lazerctrl_Load(object sender, EventArgs e)
{
// 注册键盘按键⿏标按下事件
keyb1.MouseDown += new MouseEventHandler(mybutton_down);
keyb2.MouseDown += new MouseEventHandler(mybutton_down);
keyb3.MouseDown += new MouseEventHandler(mybutton_down);
visual studio代码大全keyb4.MouseDown += new MouseEventHandler(mybutton_down);
keyb5.MouseDown += new MouseEventHandler(mybutton_down);
keyb6.MouseDown += new MouseEventHandler(mybutton_down);
keyb7.MouseDown += new MouseEventHandler(mybutton_down);
keyb8.MouseDown += new MouseEventHandler(mybutton_down);
keyb9.MouseDown += new MouseEventHandler(mybutton_down);
keyb0.MouseDown += new MouseEventHandler(mybutton_down);
keybback.MouseDown += new MouseEventHandler(mybutton_down);
keybclear.MouseDown += new MouseEventHandler(mybutton_down);
// 注册键盘按键⿏标弹起事件
keyb1.MouseUp += new MouseEventHandler(mybutton_Up);
keyb2.MouseUp += new MouseEventHandler(mybutton_Up);
keyb3.MouseUp += new MouseEventHandler(mybutton_Up);
keyb4.MouseUp += new MouseEventHandler(mybutton_Up);
keyb5.MouseUp += new MouseEventHandler(mybutton_Up);
keyb6.MouseUp += new MouseEventHandler(mybutton_Up);
keyb7.MouseUp += new MouseEventHandler(mybutton_Up);
keyb8.MouseUp += new MouseEventHandler(mybutton_Up);
keyb9.MouseUp += new MouseEventHandler(mybutton_Up);
keyb0.MouseUp += new MouseEventHandler(mybutton_Up);
keybback.MouseUp += new MouseEventHandler(mybutton_Up);
keybclear.MouseUp += new MouseEventHandler(mybutton_Up);
}
// 执⾏按键⿏标按下操作
void mybutton_down(object sender, EventArgs e)
{
Label clickbtn = (Label)sender;
clickbtn.BackColor = System.Drawing.SystemColors.ActiveCaption;
clickbtn.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
}
/
/ 执⾏按键⿏标弹起操作
void mybutton_Up(object sender, EventArgs e)
{
Label clickbtn = (Label)sender;
clickbtn.BackColor = System.Drawing.Color.Aqua;
clickbtn.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
}
⾄此，记录完毕。
参考链接
参考了很多，记不起来了，这么实现的灵感就来⾃于各种搜查的各类信息
记录时间：2017-6-11
记录地点：江苏淮安
发表评论