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system plugin with getlasterror and formatmessage

4 posts

shadowpoa#

system plugin with getlasterror and formatmessage

Hi people,

I´m been trying to modify a function on this link (http://nsis.sourceforge.net/Reading_...from_DLL_files) to use formatmessage in conjunction with getlasterror, so I can get the verbose message from kernel32 funcions called with ?e at the end.

My approach is like this:

!define FORMAT_MESSAGE_FROM_SYSTEM      0x00001000
!define FORMAT_MESSAGE_ALLOCATE_BUFFER    0x00000100
!define FORMAT_MESSAGE_IGNORE_INSERTS    0x00000200
!define FORMAT_MESSAGE_MAX_WIDTH_MASK    0x000000FF
!macro ReadStringFromDLL STRING_ID VAR
   System::Call 'kernel32::GetSystemDefaultLangID(i v)i .R0'
   StrCpy $0 ${FORMAT_MESSAGE_FROM_SYSTEM}
   IntOp $0 $0 + ${FORMAT_MESSAGE_ALLOCATE_BUFFER}
   IntOp $0 $0 + ${FORMAT_MESSAGE_IGNORE_INSERTS}
   IntOp $0 $0 + ${FORMAT_MESSAGE_MAX_WIDTH_MASK}
   System::Call 'kernel32::FormatMessage(i r0,i n, i ${STRING_ID}, i R0, *w .R2, i ${NSIS_MAX_STRLEN}, i n) i .R3'
   StrCpy ${VAR} $R2
!macroend
the result on ${VAR} is a bunch of '************????' that I dont understand where it came from... 😐

Reading MSDN (http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx), it appears to be right.

Seen a lot of people have problem with this function.

Some help would be much appreciated. 😉

(sorry the bad english)
shadowpoa#
Got It

Anders

Use FormatMessageW or change *w to *t maybe...
Got It! but just changing to *t, FormatMessageW gives only fist char of the message string, I cant find information at MSDN/Google about the especific "FormatMessageW"

Many Thanks, its working now. 😁😁😁
Anders#
Use FormatMessageW or change *w to *t (FormatMessage+*t or FormatMessageW+*w)

There is no FormatMessage, there is only FormatMessageA and FormatMessageW. To use the system plugin you should know a thing or two about the Windows API...