C5PE calling Delphi 5 DLL
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Hi-Tech Softwar
#1 / 5
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 C5PE calling Delphi 5 DLL Hi to All I've been looking at the on-line help, manuals, etc. but still have the
following problem: I can call the delphi DLL and connect to a database,
display messages on the screen, etc. However, when I try to call a function
with a parameter list, an invalid page fault occurs.
I have tried to prototype the Delphi procedure as follow:
tester procedure(*pstring),Pascal,dll
tester procedure(*pstring),pascal,dll,raw
The parameter in the Delphi DLL is a normal string type. It seems that the
data type conversion is not working.
Any ideas?
TIA
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| Tue, 23 Mar 2004 03:32:39 GMT |
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Eric Cossettin
#2 / 5
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C5PE calling Delphi 5 DLL Try this ..... Delphi DLL
function TestFunc(TestVariable:PChar): PChar;stdcall;
begin
try
// bla bla
end;
except
Result := '';
End;
end;
Clarion declaration
TestFunc(*CString),RAW,PASCAL,CString
When calling the function use clarion CString.
Works for me.
Regards
Eric
Quote: > Hi to All > I've been looking at the on-line help, manuals, etc. but still have the
> following problem: I can call the Delphi DLL and connect to a database,
> display messages on the screen, etc. However, when I try to call a
function
> with a parameter list, an invalid page fault occurs.
> I have tried to prototype the Delphi procedure as follow:
> tester procedure(*pstring),pascal,dll
> tester procedure(*pstring),pascal,dll,raw
> The parameter in the Delphi DLL is a normal string type. It seems that the
> data type conversion is not working.
> Any ideas?
> TIA
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| Tue, 23 Mar 2004 11:04:48 GMT |
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J. Ashley Stah
#3 / 5
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C5PE calling Delphi 5 DLL Make sure that the function from the Delphi DLL has stdcall so that outsiders may use this DLL. --
Ashley Stahl
eBusiness-Technologies, Inc.
Quote: > Hi to All > I've been looking at the on-line help, manuals, etc. but still have the
> following problem: I can call the Delphi DLL and connect to a database,
> display messages on the screen, etc. However, when I try to call a
function
> with a parameter list, an invalid page fault occurs.
> I have tried to prototype the Delphi procedure as follow:
> tester procedure(*pstring),pascal,dll
> tester procedure(*pstring),pascal,dll,raw
> The parameter in the Delphi DLL is a normal string type. It seems that the
> data type conversion is not working.
> Any ideas?
> TIA
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| Tue, 23 Mar 2004 19:42:54 GMT |
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Morné Ow
#4 / 5
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C5PE calling Delphi 5 DLL Eric thanks for the help. It works, but how do I pass a parameter by
reference to the Delphi DLL, therefore allowing Delphi to alter the
value so that Clarion reads the new value.
By adding VAR into the Delphi declaration it GPF's again.
Many thanks
Quote: > Hi to All > I've been looking at the on-line help, manuals, etc. but still have the
> following problem: I can call the Delphi DLL and connect to a database,
> display messages on the screen, etc. However, when I try to call a function
> with a parameter list, an invalid page fault occurs.
> I have tried to prototype the Delphi procedure as follow:
> tester procedure(*pstring),pascal,dll
> tester procedure(*pstring),pascal,dll,raw
> The parameter in the Delphi DLL is a normal string type. It seems that the
> data type conversion is not working.
> Any ideas?
> TIA
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| Tue, 23 Mar 2004 20:15:50 GMT |
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Eric Cossettin
#5 / 5
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C5PE calling Delphi 5 DLL You will have to allocated the memory for the variable at some point. the command is GetMem(VariableName,1024); I suggest you do it after the export so that it only allocates the memory once when your app inits the dll.. Exports
MyFunction;
begin
GetMem(VariableName,1024);
end.
Quote: > Eric > thanks for the help. It works, but how do I pass a parameter by
> reference to the Delphi DLL, therefore allowing Delphi to alter the
> value so that Clarion reads the new value.
> By adding VAR into the Delphi declaration it GPF's again.
> Many thanks
Quote: > > Hi to All > > I've been looking at the on-line help, manuals, etc. but still have the
> > following problem: I can call the Delphi DLL and connect to a database,
> > display messages on the screen, etc. However, when I try to call a
function
> > with a parameter list, an invalid page fault occurs.
> > I have tried to prototype the Delphi procedure as follow:
> > tester procedure(*pstring),pascal,dll
> > tester procedure(*pstring),pascal,dll,raw
> > The parameter in the Delphi DLL is a normal string type. It seems that
the
> > data type conversion is not working.
> > Any ideas?
> > TIA
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| Fri, 26 Mar 2004 09:27:04 GMT |
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