Below we will look at a program in Excel VBA that reads data from a text file. MyFile of type String, text of type String, textline of type String, posLat of type Integer. Use the GetOpenFilename method of the Application object to display the. Place your cursor on GetOpenFilename in the Visual Basic Editor and click F1 for.
![Function Function](/uploads/1/2/5/4/125463737/734106445.png)
Optimize string handling in Visual Basic 6.0 - Part II Optimize strings II Optimize string handling in VB6 - Part II Make your Visual Basic apps process text fast as lightning. Part II of this article dives deep into the performance of the VB6 String functions. We learn the functions to use and the ones to avoid. We also learn how to call the Windows Unicode API functions and how to build really, really huge strings without crashing our VB6 apps. Part II As told in, you can use many tricks to make VB6 process strings faster. We are now going deeper into the details of fast and robust string programming. Related articles: Optimize for memory and speed.
MyString = Chr ( 9 ) + 'This is a test' + Chr ( 13 ) therefore ensures that the text is preceded by a tab character (Unicode-value 9) and that a hard line break (Unicode-value 13) is added after the text. Case conversion OpenOffice.org Basic provides two functions to convert lowercase characters in a string to uppercase and vice-versa. LCase(MyString) converts all letters in MyString to lowercase. Only uppercase letters within the string are converted. All lowercase letters and nonletter characters remain unchanged. UCase(MyString) converts all letters in MyString to uppercase.
Only lowercase letters within the string are converted. All uppercase letters and nonletter characters remain unchanged. Accessing Parts of a String OpenOffice.org Basic provides four functions that return partial strings, plus a length function: Left(MyString, Length) returns the first Length characters of MyString. Right(MyString, Length) returns the last Length characters of MyString. Mid(MyString, Start, Length) returns first Length characters of MyString as of the Start position. Trim(MyString) removes all leading and trailing spaces from MyString.
Len(MyString) returns the number of characters in MyString. Unlike array subscripts, character positions in a string start with 1. Here are a few example calls for the named functions. Dim MyString As String Dim MyResult As String Dim MyLen As Integer MyString = 'This is a small test' MyResult = Left (MyString, 5 ) ' Provides the string 'This ' MyResult = Right (MyString, 5 ) ' Provides the string ' test' MyResult = Mid (MyString, 8, 5 ) ' Provides the string ' a sm' MyResult = Trim ( ' String with spaces ' ) ' Provides the string 'String with spaces' MyLen = Len (MyString ) ' Provides the value 20 Search and Replace OpenOffice.org Basic provides the InStr function for searching for a partial string within another string. PositionOfMatch = InStr (MyString, StringToFind ) The StringToFind parameter specifies the string to be searched for within MyString. The function returns a number that contains the position at which the StringToFind first appears within MyString; a return value of zero indicates no match. If you want to find other matches for the string, the function also provides the opportunity to specify an optional start position from which OpenOffice.org Basic begins the search.
In this case, the syntax of the function is. When it is used with 4 arguments, to replace a sub-string in a string, Mid is an instruction, not a function: it does not return any value! Formatting Strings The Format function formats numbers as a string. To do this, the function expects a Format expression to be specified, which is then used as the template for formatting the numbers. Each place holder within the template ensures that this item is formatted correspondingly in the output value.
The five most important place holders within a template are the zero ( 0), pound sign ( #), period (.), comma (,) and dollar sign ( $) characters. The 0 character within the template ensures that a number is always placed at the corresponding point. If a number is not provided, 0 is displayed in its place.
Stands for the decimal point symbol defined by the operating system in the country-specific settings. The example below shows how the 0. Characters can define the digits after the decimal point in an expression.