Return string array from a delphi dll
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-1
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I want to return string array from a delphi dll to delphi application. This is what i tried. But it gives Invalid pointer operation error.
dll code
type
TStringArray = array of string;
function GetDataArray(): TStringArray; stdcall;
var D: TnxQuery;
begin
form1 := TForm1.Create(nil);
result := form1.GetData;
end;
function TForm1.GetData: TStringArray;
begin
SetLength(result, 2);
result[0] := 'AAA';
result[1] := 'BBB';
end;
Delphi application code
function GetDataArray(): TStringArray; stdcall; external 'Nx2Con.dll';
procedure TForm1.Button1Click(Sender: TObject);
begin
GetDataArray;
end;
delphi dll delphi-xe2 delphi-2010
asked Nov 20 at 5:54
Danush
344
add a comment |
up vote
-1
down vote
favorite
I want to return string array from a delphi dll to delphi application. This is what i tried. But it gives Invalid pointer operation error.
dll code
type
TStringArray = array of string;
function GetDataArray(): TStringArray; stdcall;
var D: TnxQuery;
begin
form1 := TForm1.Create(nil);
result := form1.GetData;
end;
function TForm1.GetData: TStringArray;
begin
SetLength(result, 2);
result[0] := 'AAA';
result[1] := 'BBB';
end;
Delphi application code
function GetDataArray(): TStringArray; stdcall; external 'Nx2Con.dll';
procedure TForm1.Button1Click(Sender: TObject);
begin
GetDataArray;
end;
delphi dll delphi-xe2 delphi-2010
asked Nov 20 at 5:54
Danush
344
3
Memory is allocated in one module and then destroyed in another. A well known problem. You can use a shared memory manager, or have the caller allocate the memory, or indeed there are other approaches.
– David Heffernan
Nov 20 at 6:17
Please do yourself a favour and thoroughly read my article about DLL dos and don'ts. You can pass back strings and arrays of strings from DLLs, but most definitely not the way you do it. And if this is a DLL to be used by Delphi and/or C++Builder only, consider using packages instead.
– Rudy Velthuis
Nov 20 at 7:03
If you make reading your questions easier, you will likely get more answers. In this case: Please indent your source code.
– dummzeuch
Nov 20 at 10:15
add a comment |
up vote
-1
down vote
favorite
up vote
-1
down vote
favorite
I want to return string array from a delphi dll to delphi application. This is what i tried. But it gives Invalid pointer operation error.
dll code
type
TStringArray = array of string;
function GetDataArray(): TStringArray; stdcall;
var D: TnxQuery;
begin
form1 := TForm1.Create(nil);
result := form1.GetData;
end;
function TForm1.GetData: TStringArray;
begin
SetLength(result, 2);
result[0] := 'AAA';
result[1] := 'BBB';
end;
Delphi application code
function GetDataArray(): TStringArray; stdcall; external 'Nx2Con.dll';
procedure TForm1.Button1Click(Sender: TObject);
begin
GetDataArray;
end;
delphi dll delphi-xe2 delphi-2010
asked Nov 20 at 5:54
Danush
344
I want to return string array from a delphi dll to delphi application. This is what i tried. But it gives Invalid pointer operation error.
dll code
type
TStringArray = array of string;
function GetDataArray(): TStringArray; stdcall;
var D: TnxQuery;
begin
form1 := TForm1.Create(nil);
result := form1.GetData;
end;
function TForm1.GetData: TStringArray;
begin
SetLength(result, 2);
result[0] := 'AAA';
result[1] := 'BBB';
end;
Delphi application code
function GetDataArray(): TStringArray; stdcall; external 'Nx2Con.dll';
procedure TForm1.Button1Click(Sender: TObject);
begin
GetDataArray;
end;
delphi dll delphi-xe2 delphi-2010
delphi dll delphi-xe2 delphi-2010
asked Nov 20 at 5:54
Danush
344
asked Nov 20 at 5:54
Danush
344
asked Nov 20 at 5:54
Danush
344
asked Nov 20 at 5:54
Danush
344
asked Nov 20 at 5:54
Danush
344
344
3
Memory is allocated in one module and then destroyed in another. A well known problem. You can use a shared memory manager, or have the caller allocate the memory, or indeed there are other approaches.
– David Heffernan
Nov 20 at 6:17
Please do yourself a favour and thoroughly read my article about DLL dos and don'ts. You can pass back strings and arrays of strings from DLLs, but most definitely not the way you do it. And if this is a DLL to be used by Delphi and/or C++Builder only, consider using packages instead.
– Rudy Velthuis
Nov 20 at 7:03
If you make reading your questions easier, you will likely get more answers. In this case: Please indent your source code.
– dummzeuch
Nov 20 at 10:15
add a comment |
3
Memory is allocated in one module and then destroyed in another. A well known problem. You can use a shared memory manager, or have the caller allocate the memory, or indeed there are other approaches.
– David Heffernan
Nov 20 at 6:17
Please do yourself a favour and thoroughly read my article about DLL dos and don'ts. You can pass back strings and arrays of strings from DLLs, but most definitely not the way you do it. And if this is a DLL to be used by Delphi and/or C++Builder only, consider using packages instead.
– Rudy Velthuis
Nov 20 at 7:03
If you make reading your questions easier, you will likely get more answers. In this case: Please indent your source code.
– dummzeuch
Nov 20 at 10:15
3
3
Memory is allocated in one module and then destroyed in another. A well known problem. You can use a shared memory manager, or have the caller allocate the memory, or indeed there are other approaches.
– David Heffernan
Nov 20 at 6:17
Memory is allocated in one module and then destroyed in another. A well known problem. You can use a shared memory manager, or have the caller allocate the memory, or indeed there are other approaches.
– David Heffernan
Nov 20 at 6:17
Please do yourself a favour and thoroughly read my article about DLL dos and don'ts. You can pass back strings and arrays of strings from DLLs, but most definitely not the way you do it. And if this is a DLL to be used by Delphi and/or C++Builder only, consider using packages instead.
– Rudy Velthuis
Nov 20 at 7:03
Please do yourself a favour and thoroughly read my article about DLL dos and don'ts. You can pass back strings and arrays of strings from DLLs, but most definitely not the way you do it. And if this is a DLL to be used by Delphi and/or C++Builder only, consider using packages instead.
– Rudy Velthuis
Nov 20 at 7:03
If you make reading your questions easier, you will likely get more answers. In this case: Please indent your source code.
– dummzeuch
Nov 20 at 10:15
If you make reading your questions easier, you will likely get more answers. In this case: Please indent your source code.
– dummzeuch
Nov 20 at 10:15
add a comment |
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3
Memory is allocated in one module and then destroyed in another. A well known problem. You can use a shared memory manager, or have the caller allocate the memory, or indeed there are other approaches.
– David Heffernan
Nov 20 at 6:17
Please do yourself a favour and thoroughly read my article about DLL dos and don'ts. You can pass back strings and arrays of strings from DLLs, but most definitely not the way you do it. And if this is a DLL to be used by Delphi and/or C++Builder only, consider using packages instead.
– Rudy Velthuis
Nov 20 at 7:03
If you make reading your questions easier, you will likely get more answers. In this case: Please indent your source code.
– dummzeuch
Nov 20 at 10:15