[fpc-pascal] Adding a array of float in ressource and use it ?
Michael Van Canneyt
michael at freepascal.org
Tue Mar 7 14:23:55 CET 2017
On Tue, 7 Mar 2017, Sven Barth via fpc-pascal wrote:
> Am 07.03.2017 13:49 schrieb "fredvs" <fiens at hotmail.com>:
>>
>>> To access a file stored as a resource you need to use TResourceStream.
>>
>> Ho my Dog, I did not know this one.
>> More than perfect, many thanks Sven.
>>
>> PS: About array of float into TFileStream, after Googling a while, it s
> not
>> possible to do directly like fpc does for C compilers.
>> You need a conversion (like explained by Lukasz Sokol).
>> And it is the reason why I am (once again) very impressed by fpc.
>
> Huh? Of course you can do that rather similary in C as well.
Indeed. You can do exactly the same. You can do this:
{$mode objfpc}
uses classes;
Type
Float = Double;
TFloatArray = Array of Float;
Procedure TestRW(X : TFloatArray);
Var
F : TFileStream;
Y : TFloatArray;
I : Integer;
begin
// Write
F:=TFileStream.Create('float.dat',fmCreate);
try
F.WriteBuffer(X[0],Length(X)*SizeOf(Float));
finally
F.Free;
end;
// Read
F:=TFileStream.Create('float.dat',fmOpenRead);
try
SetLength(Y,F.Size div SizeOf(Float));
F.ReadBuffer(Y[0],F.Size);
finally
F.Free;
end;
// Check
If Length(Y)<>Length(X) then
Writeln('Wrong length')
else For I:=0 to Length(X)-1 do
if (X[i]<>Y[i]) then
Writeln('Wrong element at pos ',i,': ',X[i]<>Y[i]);
end;
var
X : TFloatArray;
I : Integer;
begin
SetLength(X,10);
Writeln('Floats');
For I:=0 to Length(X)-1 do
X[i]:=10+(1/(1+I));
TestRW(X);
Writeln('integers');
For I:=0 to Length(X)-1 do
X[i]:=10+I;
TestRW(X);
end.
Michael.
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