问如何使用ISNULL/空函数(VBA)EN文章背景：在VBA代码中，有时需要创建动态数组，然后对该动态数组进行...
vbNullChar赋值或检测null字符,null字符的值为Chr(0),即vbNullChar常数相当于将变量赋值为Chr(0),可用于检测变量,确定它的值是否是一个null字符。 vbNullString赋值或检测零长(空)字符串。 Null关键字将null值赋给variant变量后,可以通过调用IsNull函数来检测变量是否是Null值。 vbEmpty检测某个variant变量是否初始化。
但是,似乎无法检查工作簿对象是否为空: Debug.Print IsObject(dWorkbook) ' returns true > expected as obj as such still exists Debug.Print IsNull(dWorkbook) ' returns false Debug.Print IsEmpty(dWorkbook) ' returns false Debug.Print TypeName(dWorkbook) ' returns object > expected If dWorkbook I...
IsNumeric(x) ‘是否为数字, 返回Boolean结果,True or FalseIsDate(x) ‘是否是日期, 返回Boolean结果,True or FalseIsEmpty(x) ‘是否为Empty, 返回Boolean结果,True or FalseIsArray(x) ‘指出变量是否为一个数组。IsError(expression) ‘指出表达式是否为一个错误值IsNull(expression) ‘指出表达式是否不包含...
("You Can't Undo This Action. " _ & "Save Workbook First?", _ vbYesNoCancel, "Alert") Case Is = vbYesThisWorkbook.Save Case Is = vbCancel Exit Sub End Select Set myRange = Selection For Each myCell In myRange If Not IsEmpty(myCell) Then myCell = Trim(myCell) End If Next ...
Write #1, MyError; " is an error value" Close #1 ' 关闭文件。 我们可以看到写入的内容为: "Hello World",1234 #FALSE#," is a Boolean value" #1969-02-12#," is a date" #NULL#," is a null value" #ERROR 32767#," is an error value" ...
官方文档定义:A special data type that can contain numeric, string, or date data as well as user-defined types and the special values Empty and Null. The Variant data type has a numeric storage size of 16 bytes and can contain data up to the range of a Decimal, or a character storage...
' If this routine was called by the batch routine... If g_bCalledByBatch Then 'Get the reference of the changing date cell sDateRef = GetNameVal("ChgDateCell", 0, g_nReference) ' If the date name is empty, return null sDateFormula If sDateRef = g_sNull Then sDateFormula = g...
10、ing) As Boolean Dim dataType As Variant Dim Data As Variant ent.GetXData strAppName, dataType, Data HasXData = True If IsEmpty(dataType) Then HasXData = False End IfEnd Function Dim SET_PL As AcadSelectionSet Dim SET_name As String SET_name = "setname" Dim F_type(0 To 7)...
Subadd_comment(xAsSingle)'This Code will Evaluate if the variable is nullIfIsEmpty(x)ThenMsBox"Variable is Null"ElseActiveCell.Value=xEndIfEndSub Visual Basic Copy The above code will generate a runtime error because it is trying to callMsboxfunction, but this function has not been defined....