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#1
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Test for Error in cells
I am trying to test for letters or numbers within a cell. I cannot get the Iserror to work correctly, nonerror is ok, but if it is an error, i cannot get True, i get a VBA error. Can someone please help? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If IsError(a1 * b1) Then MsgBox "error" Else: MsgBox "nonerror" End If |
#2
Posted to microsoft.public.excel.programming
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Test for Error in cells
Does this code do what you want? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If a1$ Like "#" And b1$ Like "#" Then MsgBox "Two numbers" Else MsgBox "Error" End If If not, I think you will need to provide more information about what is in A1 and B1 and what you actually want to do with them. -- Rick (MVP - Excel) "LeeL" wrote in message ... I am trying to test for letters or numbers within a cell. I cannot get the Iserror to work correctly, nonerror is ok, but if it is an error, i cannot get True, i get a VBA error. Can someone please help? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If IsError(a1 * b1) Then MsgBox "error" Else: MsgBox "nonerror" End If |
#3
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Test for Error in cells
Yes it does- Thanks! I also got it working using IsNumericand Not IsNumeric. Like "#" 'is testing for a number, is there a similar way to test for a letter. -- Thanks & Best Regards "Rick Rothstein" wrote: Does this code do what you want? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If a1$ Like "#" And b1$ Like "#" Then MsgBox "Two numbers" Else MsgBox "Error" End If If not, I think you will need to provide more information about what is in A1 and B1 and what you actually want to do with them. -- Rick (MVP - Excel) "LeeL" wrote in message ... I am trying to test for letters or numbers within a cell. I cannot get the Iserror to work correctly, nonerror is ok, but if it is an error, i cannot get True, i get a VBA error. Can someone please help? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If IsError(a1 * b1) Then MsgBox "error" Else: MsgBox "nonerror" End If |
#4
Posted to microsoft.public.excel.programming
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Test for Error in cells
"LeeL" wrote: I am trying to test for letters or numbers within a cell. I cannot get the Iserror to work correctly, nonerror is ok, but if it is an error, i cannot get True, i get a VBA error. Can someone please help? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If IsError(a1 * b1) Then MsgBox "error" Else: MsgBox "nonerror" End If Sub test() Dim a1$, b1$, v a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("B1").Text, 3, 1) '.... On Error Resume Next v = a1$ * b1$ If Err Then Err.Clear MsgBox "Error" Else MsgBox "Not Error" End If On Error GoTo 0 End Sub regards r Il mio ultimo lavoro ... http://excelvba.altervista.org/blog/...ternative.html |
#5
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Test for Error in cells
This will test for an upper case letter... If a1$ Like "[A-Z]" Then This will test for a lower case letter... If a1$ Like "[a-z]" Then And this will test for a letter no matter what its case is... If a1$ Like "[A-Za-z]" Then Of course, the Like operator can do far more than testing for single characters. If you are interested in seeing what else it can do, put your cursor on the keyword Like in any place it is used in your code and then press the F1 key. By the way, for single digit checking, IsNumeric is okay to use; however, you might want to consider the following previous posting of mine if you ever intend to use it for checking multiple digits... I usually try and steer people away from using IsNumeric to "proof" supposedly numeric text. Consider this (also see note below): ReturnValue = IsNumeric("($1,23,,3.4,,,5,,E67$)") Most people would not expect THAT to return True. IsNumeric has some "flaws" in what it considers a proper number and what most programmers are looking for. I had a short tip published by Pinnacle Publishing in their Visual Basic Developer magazine that covered some of these flaws. Originally, the tip was free to view but is now viewable only by subscribers.. Basically, it said that IsNumeric returned True for things like -- currency symbols being located in front or in back of the number as shown in my example (also applies to plus, minus and blanks too); numbers surrounded by parentheses as shown in my example (some people use these to mark negative numbers); numbers containing any number of commas before a decimal point as shown in my example; numbers in scientific notation (a number followed by an upper or lower case "D" or "E", followed by a number equal to or less than 305 -- the maximum power of 10 in VB); and Octal/Hexadecimal numbers (&H for Hexadecimal, &O or just & in front of the number for Octal). NOTE: ====== In the above example and in the referenced tip, I refer to $ signs and commas and dots -- these were meant to refer to your currency, thousands separator and decimal point symbols as defined in your local settings -- substitute your local regional symbols for these if appropriate. As for your question about checking numbers, here are two functions that I have posted in the past for similar questions..... one is for digits only and the other is for "regular" numbers: Function IsDigitsOnly(Value As String) As Boolean IsDigitsOnly = Len(Value) 0 And _ Not Value Like "*[!0-9]*" End Function Function IsNumber(ByVal Value As String) As Boolean ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9.]*" And _ Not Value Like "*.*.*" And _ Len(Value) 0 And Value < "." And _ Value < vbNullString End Function Here are revisions to the above functions that deal with the local settings for decimal points (and thousand's separators) that are different than used in the US (this code works in the US too, of course). Function IsNumber(ByVal Value As String) As Boolean Dim DP As String ' Get local setting for decimal point DP = Format$(0, ".") ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9" & DP & "]*" And _ Not Value Like "*" & DP & "*" & DP & "*" And _ Len(Value) 0 And Value < DP And _ Value < vbNullString End Function I'm not as concerned by the rejection of entries that include one or more thousand's separators, but we can handle this if we don't insist on the thousand's separator being located in the correct positions (in other words, we'll allow the user to include them for their own purposes... we'll just tolerate their presence). Function IsNumber(ByVal Value As String) As Boolean Dim DP As String Dim TS As String ' Get local setting for decimal point DP = Format$(0, ".") ' Get local setting for thousand's separator ' and eliminate them. Remove the next two lines ' if you don't want your users being able to ' type in the thousands separator at all. TS = Mid$(Format$(1000, "#,###"), 2, 1) Value = Replace$(Value, TS, "") ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9" & DP & "]*" And _ Not Value Like "*" & DP & "*" & DP & "*" And _ Len(Value) 0 And Value < DP And _ Value < vbNullString End Function -- Rick (MVP - Excel) "LeeL" wrote in message ... Yes it does- Thanks! I also got it working using IsNumericand Not IsNumeric. Like "#" 'is testing for a number, is there a similar way to test for a letter. -- Thanks & Best Regards "Rick Rothstein" wrote: Does this code do what you want? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If a1$ Like "#" And b1$ Like "#" Then MsgBox "Two numbers" Else MsgBox "Error" End If If not, I think you will need to provide more information about what is in A1 and B1 and what you actually want to do with them. -- Rick (MVP - Excel) "LeeL" wrote in message ... I am trying to test for letters or numbers within a cell. I cannot get the Iserror to work correctly, nonerror is ok, but if it is an error, i cannot get True, i get a VBA error. Can someone please help? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If IsError(a1 * b1) Then MsgBox "error" Else: MsgBox "nonerror" End If |
#6
Posted to microsoft.public.excel.programming
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Test for Error in cells
Thank you very much for all the examples! And very glad I mentioned the
IsNumeric and you pointed out the flaws. I will use Like "[A-Za-z]" and Like "#", I'm sure this will will save me from headaces the IsNumeric would create! -- Thanks & Best Regards "Rick Rothstein" wrote: This will test for an upper case letter... If a1$ Like "[A-Z]" Then This will test for a lower case letter... If a1$ Like "[a-z]" Then And this will test for a letter no matter what its case is... If a1$ Like "[A-Za-z]" Then Of course, the Like operator can do far more than testing for single characters. If you are interested in seeing what else it can do, put your cursor on the keyword Like in any place it is used in your code and then press the F1 key. By the way, for single digit checking, IsNumeric is okay to use; however, you might want to consider the following previous posting of mine if you ever intend to use it for checking multiple digits... I usually try and steer people away from using IsNumeric to "proof" supposedly numeric text. Consider this (also see note below): ReturnValue = IsNumeric("($1,23,,3.4,,,5,,E67$)") Most people would not expect THAT to return True. IsNumeric has some "flaws" in what it considers a proper number and what most programmers are looking for. I had a short tip published by Pinnacle Publishing in their Visual Basic Developer magazine that covered some of these flaws. Originally, the tip was free to view but is now viewable only by subscribers.. Basically, it said that IsNumeric returned True for things like -- currency symbols being located in front or in back of the number as shown in my example (also applies to plus, minus and blanks too); numbers surrounded by parentheses as shown in my example (some people use these to mark negative numbers); numbers containing any number of commas before a decimal point as shown in my example; numbers in scientific notation (a number followed by an upper or lower case "D" or "E", followed by a number equal to or less than 305 -- the maximum power of 10 in VB); and Octal/Hexadecimal numbers (&H for Hexadecimal, &O or just & in front of the number for Octal). NOTE: ====== In the above example and in the referenced tip, I refer to $ signs and commas and dots -- these were meant to refer to your currency, thousands separator and decimal point symbols as defined in your local settings -- substitute your local regional symbols for these if appropriate. As for your question about checking numbers, here are two functions that I have posted in the past for similar questions..... one is for digits only and the other is for "regular" numbers: Function IsDigitsOnly(Value As String) As Boolean IsDigitsOnly = Len(Value) 0 And _ Not Value Like "*[!0-9]*" End Function Function IsNumber(ByVal Value As String) As Boolean ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9.]*" And _ Not Value Like "*.*.*" And _ Len(Value) 0 And Value < "." And _ Value < vbNullString End Function Here are revisions to the above functions that deal with the local settings for decimal points (and thousand's separators) that are different than used in the US (this code works in the US too, of course). Function IsNumber(ByVal Value As String) As Boolean Dim DP As String ' Get local setting for decimal point DP = Format$(0, ".") ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9" & DP & "]*" And _ Not Value Like "*" & DP & "*" & DP & "*" And _ Len(Value) 0 And Value < DP And _ Value < vbNullString End Function I'm not as concerned by the rejection of entries that include one or more thousand's separators, but we can handle this if we don't insist on the thousand's separator being located in the correct positions (in other words, we'll allow the user to include them for their own purposes... we'll just tolerate their presence). Function IsNumber(ByVal Value As String) As Boolean Dim DP As String Dim TS As String ' Get local setting for decimal point DP = Format$(0, ".") ' Get local setting for thousand's separator ' and eliminate them. Remove the next two lines ' if you don't want your users being able to ' type in the thousands separator at all. TS = Mid$(Format$(1000, "#,###"), 2, 1) Value = Replace$(Value, TS, "") ' Leave the next statement out if you don't ' want to provide for plus/minus signs If Value Like "[+-]*" Then Value = Mid$(Value, 2) IsNumber = Not Value Like "*[!0-9" & DP & "]*" And _ Not Value Like "*" & DP & "*" & DP & "*" And _ Len(Value) 0 And Value < DP And _ Value < vbNullString End Function -- Rick (MVP - Excel) "LeeL" wrote in message ... Yes it does- Thanks! I also got it working using IsNumericand Not IsNumeric. Like "#" 'is testing for a number, is there a similar way to test for a letter. -- Thanks & Best Regards "Rick Rothstein" wrote: Does this code do what you want? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If a1$ Like "#" And b1$ Like "#" Then MsgBox "Two numbers" Else MsgBox "Error" End If If not, I think you will need to provide more information about what is in A1 and B1 and what you actually want to do with them. -- Rick (MVP - Excel) "LeeL" wrote in message ... I am trying to test for letters or numbers within a cell. I cannot get the Iserror to work correctly, nonerror is ok, but if it is an error, i cannot get True, i get a VBA error. Can someone please help? a1$ = Mid(Range("a1").Text, 2, 1) b1$ = Mid(Range("b1").Text, 3, 1) If IsError(a1 * b1) Then MsgBox "error" Else: MsgBox "nonerror" End If |
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