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如何检查mdi子进程已经运行？

发布于 2024-08-23 04:46:38 字数 63 浏览 11 评论 0原文

请帮助我..我有一个使用 MDI 应用程序的项目。我的问题是，如何检查 mdi 孩子是否已经运行..？请帮我..

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梦明 2024-08-30 04:46:38

我使用以下技术，但它需要每个表单类型都有一个特定的子（我使用的是 VB.NET）。不过，我确信可能有一种方法可以简化此操作，以使用一个子项处理所有子表单

        Dim blExists As Boolean = False
        For Each f As Form In Me.MdiChildren
            If TypeOf (f) Is FormName Then
                f.Focus()
                blExists = True
                Exit For
            End If
        Next
        If Not blExists Then
            fAnalysis = New FormName
            fAnalysis.MdiParent = Me
            fAnalysis.Show()
        End If

以下子项适用于所有表单。

Private Sub ShowNewForm(ByVal frmName As Form)
        Dim blExists As Boolean = False
        Dim f as Form
        For Each f In Me.MdiChildren
            If f.Name Is frmName.Name Then
                f.Focus()
                blExists = True
                Exit For
            End If
        Next
        If Not blExists Then
            f = DirectCast(New Form, frmName.Type)
            fAnalysis.MdiParent = Me
            f.Show()
        End If
End Sub

I use the following technique, but it requires a specific Sub for each Form type(I'm using VB.NET). However I'm sure there could be a way to simplify this to handle all child forms with one sub

        Dim blExists As Boolean = False
        For Each f As Form In Me.MdiChildren
            If TypeOf (f) Is FormName Then
                f.Focus()
                blExists = True
                Exit For
            End If
        Next
        If Not blExists Then
            fAnalysis = New FormName
            fAnalysis.MdiParent = Me
            fAnalysis.Show()
        End If

The following sub works for all forms.

Private Sub ShowNewForm(ByVal frmName As Form)
        Dim blExists As Boolean = False
        Dim f as Form
        For Each f In Me.MdiChildren
            If f.Name Is frmName.Name Then
                f.Focus()
                blExists = True
                Exit For
            End If
        Next
        If Not blExists Then
            f = DirectCast(New Form, frmName.Type)
            fAnalysis.MdiParent = Me
            f.Show()
        End If
End Sub

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影子是时光的心 2024-08-30 04:46:38

创建 MDI 窗口时，您使用了 WM_MDICREATE 对吗？该消息返回一个窗口句柄，您应该将该句柄保存在某处，以便稍后要查找该窗口或检查它是否存在时可以引用它。

MDICREATESTRUCT mci;
// fill out mci...
HWND hwndChild = (HWND) SendMessage(hwndMDI, WM_MDICREATE, 0, (LPARAM)(ULONG_PTR)&mci); 

// save hwndChild so that I can use it later.

When you created the MDI window, you used WM_MDICREATE right? Well that message returns a window handle, You should save that handle somewhere so that you can refer to it if you want to find the window later or check to see if it exists.

MDICREATESTRUCT mci;
// fill out mci...
HWND hwndChild = (HWND) SendMessage(hwndMDI, WM_MDICREATE, 0, (LPARAM)(ULONG_PTR)&mci); 

// save hwndChild so that I can use it later.

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