| Description |
The ReallocMem procedure changes the storage size of an existing block of storage.
The size may be smaller or bigger.
If smaller, then the existing storage is effectively truncated, the remainder being released.
If larger, the storage is extended. Or a new block is allocated if necessary. In either case, the existing storage block data is preserved, and the new part is unitialised.
|
|
| Notes |
Warning : use with caution - excessive use can fragment storage.
|
|
| Related commands |
| Dispose |
|
Dispose of storage used by a pointer type variable |
| FreeMem |
|
Free memory storage used by a variable |
| GetMem |
|
Get a specified number of storage bytes |
| New |
|
Create a new pointer type variable |
|
|
|
| Example code : Allocate using GetMem and then reallocate using ReallocMem |
type
TRecord = Record
name : string[10];
age : Byte;
end;
var
recPointer : ^TRecord;
begin
// Allocate storage for 2 records
// Note : It is better to use New for this
// It is used here for illustration purposes only
GetMem(recPointer, 2 * SizeOf(TRecord));
// Fill out these 2 records with values
recPointer.name := 'Brian';
recPointer.age := 23;
Inc(recPointer);
recPointer.name := 'Jim';
recPointer.age := 55;
// Whoops - forgot to add Sally ...
Dec(recPointer);
ReallocMem(recPointer, 3 * SizeOf(TRecord));
// Now add a third record
Inc(recPointer,2);
recPointer.name := 'Sally';
recPointer.age := 38;
// Now display these values
Dec(recPointer, 2);
ShowMessageFmt('%s is %d',[recPointer.name, recPointer.age]);
Inc(recPointer);
ShowMessageFmt('%s is %d',[recPointer.name, recPointer.age]);
Inc(recPointer);
ShowMessageFmt('%s is %d',[recPointer.name, recPointer.age]);
end;
|
| Show full unit code |
Brian is 23
Jim is 55
Sally is 38
|
|