Sven Barth via fpc-pascal wrote:
Am 13.12.2017 03:04 schrieb "Dennis" <de...@avidsoft.com.hk
<mailto:de...@avidsoft.com.hk>>:
I am converting my windows 32 program to 64 bit.
It compiled with lazarus without any problem.(fpc 3.0.2)
I also compile the dll that is used, into a 64 bit dll.
However, when I ran the 64 bit program, windows reported 'cannot
find the entry point "the routine name in the dll" (the dll file name)
In the routine of the dll, there is an out parameter of type
WideString,
could this be the problem?
If not, what else could be the cause of the problem?
Considering the code you gave I really wonder how that ever worked...
Did you set the calling convention using the $calling directive?
Otherwise you need to add it to every function. Also you're on the
eager side by using the "name" clause for the external as you can be
sure then what name is used. Lastly are you sure that the DLL you're
dealing with is a 64-bit library?
In the original 32 bit program, I wrote the windows 32-bit dll in the
Starter (FREE) edition of Delphi and call (using those codes I showed
you) from my FPC 32 bit program without any problem.
Since there is NO FREE Delphi for 64 bit version, I wrote a windows
64-bit program using FPC 64 bit and then try calling it from my FPC
64-bit program and encountered the "Cannot find entry point of a routine
inside a windows 64 dll" error.
In the 32 bit program, I did not use the $calling directive and did not
use 'name' clause and it worked perfectly.
I could add the name clause in the 64 bit program, but can you teach me
how to use the $calling directive?
Since in the 64 bit version, i will be writing both the dll and the
calling program, what $calling directive should I use?
Do I need to specify it clearly on both the dll and the calling code?
Maybe you should take a look at fpSpreadsheet which allows you to work
with Excel files of different versions directly and does not need a
library.
I tried to use the fpSpreadsheet sample program last time. If the 64 bit
dll thing did not work out, I will have to rely on the fpSpreadsheet
thing but my customers are all used to Excel and prefer sticking to it :-(
Thanks for your response.
Dennis
Regards,
Sven
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