On Wed, 27 Feb 2013 02:37:21 -0800, Tom Brunberg wrote: >Bo Berglund wrote: >> Questions: >> 1) Should the array always be specified with the first element >> instead of just the array name? I want something that will always >> work. So if the verdict is FillChar(Data[0]. Rather than >> FillChar(Data. Then I will use that in the future. >> >> 2) How should the size be determined?

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1. Delphi Initialize 2 Dimensional Array
2. Delphi Initialize Dynamic Array
3. Delphi Initialize Array

In Delphi, the versatile web-programming language, 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. September 18, 2014. Dynamic Arrays in Delphi XE7. There is a significant new feature in the Object Pascal language for XE7 and that is the improved support for initializing dynamic arrays and operating on them.

Delphi Initialize 2 Dimensional Array

The example with a passed array >> plus a length parameter is really passing not the true size of the >> array, just the part of the array that is supposed to hold data. >> I always thought that SizeOf() would be the proper way to get the size >> of any storage expressed in bytes, but from the 4-byte example it >> seems not to be the case. >> >> I have used FillChar and SizeOf in order to avoid having loops >> everywhere. I also use Move to get data from one array to another (of >> the same type) quickly and with simple code lines. >> >> Am I on the wrong track?

> >Hi Bo, >Fixed size and dynamic arrays are different in the case at hand. >1) Assuming the static array starts with index 0, you can use FillChar(arr[0].) in both cases. >Dynamic arrays always starts with index 0, and you must use the indexed form. For a static array >you can omit the index (in which case the filling starts with the first element), but for a common >syntax you can use the indexed form. OK, I will use Data[0] in the future. Or is it possible to use some kind of enumerator like 'Low' instead of zero? >2) Because Dynamic arrays are reference types, SizeOf(DynArray) is same as size of pointer, so that >can not be used for your purpose.

Use Length() instead. When I use length() on an array that is passed in using a var parameter like: DoSomething(var Data: array of byte) will the Length() function know about how to find the length of the array (it can vary between calls)? Of course the Length() function delivers the number of elements in the array, so it is only a limited type of array that Length() will return the correct byte size of the data for.

Delphi Initialize Dynamic Array

Array of byte is one of these, which is OK for me now. -- Bo Berglund Developer in Sweden.

Bo Berglund wrote: > On Wed, 27 Feb 2013 02:37:21 -0800, Tom Brunberg wrote: > > Fixed size and dynamic arrays are different in the case at hand. > > 1) Assuming the static array starts with index 0, you can use FillChar(arr[0].) in both > > cases. Dynamic arrays always starts with index 0, and you must use the indexed form. For a > > static array you can omit the index (in which case the filling starts with the first element), > > but for a common syntax you can use the indexed form. > > OK, I will use Data[0] in the future. Or is it possible to use some > kind of enumerator like 'Low' instead of zero?

Delphi Initialize Array

Well, you *can* if you want to: Data[Low(Data)] > > 2) Because Dynamic arrays are reference types, SizeOf(DynArray) is same as size of pointer, so > > that can not be used for your purpose. Use Length() instead. > When I use length() on an array that is passed in using a var > parameter like: > DoSomething(var Data: array of byte) This s an 'Open Array Parameter'.

It is not the same as a dynamic array, although it looks so. It can represent a dynamic array as well as a static array or a single variable of the arrays element type. There are some important restrictions to be avare of: a) the indexing always start at 0 (even if you passed in, say, Data: array[7.10] of type) b) you can not pass it further to SetLength (even if the passed in array was dynamic) Look further in the Delphi docs (under Procedures and Functions, Parameters) > will the Length() function know about how to find the length of the > array (it can vary between calls)? With the example of a static array passed in, Data: array[7.10] of byte, Low(Data) is 0 High(Data) is 3 Length(Data) is 4 > Of course the Length() function delivers the number of elements in the > array, so it is only a limited type of array that Length() will return > the correct byte size of the data for. > array of byte is one of these, which is OK for me now.

For dynamic arrays where you must use Length() you have to multiply with the size of the elements to get the size in bytes. So, to use FillChar on MyIntArray: array of integer you would use: FillChar(MyIntArray, Length(MyIntArray)*sizeOf(integer), $FF) -- Tom Brunberg firstname.lastname@welho.com.