使用文本文件为 Access 表单中的字段提供默认值

Question

我在 Microsoft Access 中有一个弹出窗口，其中包含需要用户填写的文本框字段，例如：

First Name:
Last Name:

现在我正在尝试创建一个按钮，单击该按钮会查看 C:\mytextfile.txt 并自动填充这些字段。

在文本文件中它看起来像这样：

##$@#%#$543%#$%#$$#%LAST NAME:BOB#$#@$@#$@#$@#FIRST NAME:DERRICK$#%$#%$#%#$%$#%$#

所以基本上我在寻找 3 件事：

1. 访问文本文件
2. 解析数据
3. 将其填充到文本框中。 （在点击“保存”按钮之前，数据不需要进入表格”）

更新： 这是我目前写的，我不知道为什么它不起作用。

Private Sub LoadText_Click()

    Dim myFile As String myFile = "C:\myFile.txt"
    Me.NameofTextbox = Mid(myFile, 7, 3)

End Sub

Answer 1

此处是您提供的文件示例以及表单上名为 txtboxLastName 和 txtboxFirstName 的控件

Dim mFields() As String ' array with fields' names in file
Dim mControls() As String ' corresponding controls' names
Dim mStopChars() As String ' Characters that put after values

Dim tmpstr As String
Dim content As String

Dim i As Long
Dim fStart  As Long
Dim valStart As Long
Dim valEnd As Long
Dim FieldValue As String
Dim j As Long
Dim tmp As Long

' prepare maps

' here : included in field name for common case
mFields = Split("LAST NAME:,FIRST NAME:", ",") 
mControls = Split("txtboxLastName,txtboxFirstName", ",")
mStopChars = Split("#,$,@,%", ",")

' read file into string
Open "c:\mytextfile.txt" For Input As #1

Do While Not EOF(1)
    Input #1, tmpstr
    content = content & tmpstr
Loop

Close #1

' cycle through fields and put their values into controls
For i = LBound(mFields) To UBound(mFields)
    fStart = InStr(1, content, mFields(i))
    If fStart > 0 Then
        valStart = fStart + Len(mFields(i))  'value start at this pos
        'cycle through possible stop chars to locate end of current value
        valEnd = Len(content)
        For j = LBound(mStopChars) To UBound(mStopChars)
            tmp = InStr(valStart, content, mStopChars(j))
            If tmp > 0 Then
                If tmp <= valEnd Then
                    valEnd = tmp - 1
                End If
            End If
        Next j
        ' cut value
        FieldValue = Mid(content, valStart, valEnd - valStart + 1)
        ' assign to control
        Me.Controls(mControls(i)).Value = FieldValue
    End If
Next i