Can NSIS DumpLog be used with 64 bit version? - nsis

Question

I'm using the 64 bit build of NSIS and everything works except the DumpLog function to write the install log to a file.
(NSIS 64 is here: https://bitbucket.org/dgolub/nsis64)
DumpLog uses Windows messages to get the text value and it seems the calls are 32 bit only.
Here's an example of the function:
https://svn.xiph.org/trunk/oggdsf/build/NSIS/Release/extra/DumpLog.nsh
It defines these which are incorrect for 64 bit:
!define LVM_GETITEMCOUNT 0x1004
!define LVM_GETITEMTEXT 0x1073
I found the 64 bit version of LVM_GETITEMCOUNT which is 0x00001004.
Has anyone got this function to with 64 bit?

Answer 1

The bitbucket port does not support calling arbitrary functions with System::Call and that DumpLog function is also not 64 bit compatible because it uses the i type when p is required and there are some additional padding issues.
Here is a 64 bit compatible version:
!define LVM_GETITEMCOUNT 0x1004
!define LVM_GETITEMTEXT 0x1073
Function DumpLog
Exch $5
Push $0
Push $1
Push $2
Push $3
Push $4
Push $6
Push $7
FindWindow $0 "#32770" "" $HWNDPARENT
GetDlgItem $0 $0 1016
StrCmp $0 0 error
FileOpen $5 $5 "w"
FileWriteWord $5 0xfeff ; Write the BOM
StrCmp $5 0 error
SendMessage $0 ${LVM_GETITEMCOUNT} 0 0 $6
System::Call "*(&t${NSIS_MAX_STRLEN})p.r3"
System::Call "*(i0,i0,i0,i0,&i${NSIS_PTR_SIZE} 0,p$3,i${NSIS_MAX_STRLEN},i0,p0)p.r1" ; NSIS_PTR_SIZE is used to align the pszText member on x64
StrCpy $2 0
loop: StrCmp $2 $6 done
System::Call "User32::SendMessage(p$0,i${LVM_GETITEMTEXT},p$2,pr1)p"
System::Call "*$3(&t${NSIS_MAX_STRLEN} .r4)"
FileWriteUTF16LE $5 "$4$\r$\n"
IntOp $2 $2 + 1
Goto loop
done:
FileClose $5
System::Free $1
System::Free $3
Goto exit
error:
MessageBox MB_OK|MB_ICONSTOP "Error at DumpLog"
exit:
Pop $7
Pop $6
Pop $4
Pop $3
Pop $2
Pop $1
Pop $0
Exch $5
FunctionEnd
You need a version of System.dll that is able to call arbitrary functions and I'm afraid the only way to get that is to compile the official SVN trunk as 64 bit.
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