Can NSIS DumpLog be used with 64 bit version?

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?

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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