Delphi Initialize Array

Understanding and Using Record Data Types in Delphi. Search the site GO. Wii mii song sheet music. Computer Science. Delphi Programming Basics Tutorials Database Applications Advanced Delphi. Note: Here's how to declare and initialize a constant array of records in Delphi. Records as Record fields. Borland Delphi 4 features a number of Object Pascal language enhancements, as usual. In this article, I'll address a very handy language enhancement takes the ideas of Open Parameters and Long Strings back to the basics of arrays in the so-called Dynamic Arrays. Dynamic Arrays. In Delphi, arrays allow a developer to refer to a series of variables by the same name and to use a number (an index) to tell them apart. In most scenarios, you declare an array as a variable — thus allowing for array elements to be changed at run-time.

Say I have the variable: Var question: array1.50 of char; When I do: question:= 't'; //What is the correct way to change the value? It returns an error: Incompatible types: 'array1.50 of Char' and 'Char' Note: I want to have a max string size of 50 chars, not 50 different chars.

The reason for this question is that I have a record in another unit(This is just a basic example, not what I actually have written above) In that unit I have a Record, which I can't use the string data type in(Or is there a way? Ghost boot wizard. Please explain if there is). I just need to know how to give an array of chars a value. While Delphi strings and arrays of char are related, they are not the same. Delphi overloads assignment of strings and literals (char and string) to array of chars, but only when the lower array bound is zero. The following code works for me in D2007 and Delphi XE: var x: array0.49 of char; begin x:="b'; // char literal x:="bb'; // string literal end. If I change the 0 to 1 it fails.

This limitation probably simplifies the language helper that takes care of this, and probably the feature is only meant for dealing with converted C structs where arrays always have lower bound 0.

On the following URL, I found some different syntax to initialize an array. Examples there. Var c1: array1.10 of char:= '123456'; int2: array1.100 of integer:= 50 of 1, 50 of 2; Tried those, but didn't seem to to work. Is a loop the only way to initialize all the values in an array other than Values: array1.2 of integer = (0,0); In the program I am working on, Values will be an array of 128 integers and I would like to initialize them to 0. Right now I just using: for InitialLoop:= 1 to 128 do ValuesInitialLoop:=0; fpc-pascal maillist. Hello, Francisco!

Wednesday, March 18, 2009, 2:50:21 AM, you wrote: Is a loop the only way to initialize all the values in an array other than Values: array1.2 of integer = (0,0); In the program I am working on, Values will be an array of 128 integers and I would like to initialize them to 0. Right now I just using: for InitialLoop:= 1 to 128 do ValuesInitialLoop:=0; As far as I know, global variables are initialised with zeros when an application starts. But to ensure your array is filled with zeros you can use FillChar: FillChar(Values,SizeOf(Values),0) - Best regards, Fantomas fpc-pascal maillist. On the following URL, I found some different syntax to initialize an array. Examples there. var c1: array1.10 of char:= '123456'; int2: array1.100 of integer:= 50 of 1, 50 of 2; Tried those, but didn't seem to to work. Is a loop the only way to initialize all the values in an array other than Values: array1.2 of integer = (0,0); In the program I am working on, Values will be an array of 128 integers and I would like to initialize them to 0.

Right now I just using: for InitialLoop:= 1 to 128 do ValuesInitialLoop:=0; fpc-pascal maillist - fpc-pascal maillist. On the following URL, I found some different syntax to initialize an array. That's another Pascal extension from Sun. One of the problem (and power) of Pascal is that it's often extended arbitrarily, because no standard (other than too simple ISO 7185 and too complicated ISO 10260) exists. Remember that FPC tries to be compatible with Delphi (at least until version 7) and Turbo Pascal (also version 7), while adding its own extensions.

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c1: array1.10 of char:= '123456'; In this case, FPC still follows (not 100% conforms) the standard. C1 is a fixed length array, therefore only strings of the same length can be assigned to it. If you want to follow standards, pad it with spaces. Otherwise, use String10. int2: array1.100 of integer:= 50 of 1, 50 of 2; This is like C's array initialization (extended maybe), which is not supported. Either fill all or do it in a statement.

You can fill some followed by FillXXX which is the most commonly used method as it doesn't involve looping (MUCH faster). IMHO, FPC should consider this kind of extension though (partial filling). begin fillchar(c11,5,0); fillchar(c15,5,#32); You might need @ sign in front of c1 though. FillChar doesn't expect pointers, the above is already correct (note that it's syntactically correct, but it will fill the wrong data if you add @). On the following URL, I found some different syntax to initialize an array. Examples there. var c1: array1.10 of char:= '123456'; int2: array1.100 of integer:= 50 of 1, 50 of 2; Tried those, but didn't seem to to work.

Use only '=" instread of ':=". Working is e.g.: vector: array0.6 of longint = (1, 2, 3, 4, 5, 6, 7); type particlet = record name: array 0.Pred(16) of char; longi: integer; pressure: float; temperature: double; lati: integer; end; wbuf: array 0.Pred(NRECORDSC) of particlet = ( (name:'zero'#0; longi:0; pressure:0.0; temperature:0.0; lati:0), (name:'one'#0; longi:10; pressure:1.0; temperature:10.0; lati:10). Is a loop the only way to initialize all the values in an array other than Values: array1.2 of integer = (0,0); In the program I am working on, Values will be an array of 128 integers and I would like to initialize them to 0. Use fillchar as others mentioned. Marc Santhoff fpc-pascal maillist. FillChar(Values,SizeOf(Values),0) That worked.

However, for an integer is fillword better? A 'fillword' procedure does not exist. FillChar is an anchient Pascal function to simply fill any arbitrary memory location of any size (determined by a variable) with all the same byte.

It is very fast but there is no type checking at all (you can fill any type of variable) and I think there is no range checking either. So you should use SizeOf to give the number of bytes to be written but in special circumstance you can also use a different value. A similar procedure is move, which copies bytes from one memory location to another (again both determined by variables) also without type and range checking. Ju'rgen Hestermann. fpc-pascal maillist.