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Alice0725
Expert Cheater
 Reputation: 11
Joined: 24 Jul 2012
Posts: 145
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 Posted: Sun Dec 09, 2012 7:39 am Post subject: Need help about a very weird problem? |
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This is about the WINAPI 'SymFromName'.
This is MSDN'S C++ CODE:
| Code: | TCHAR szSymbolName[MAX_SYM_NAME];
ULONG64 buffer[(sizeof(SYMBOL_INFO) +
MAX_SYM_NAME * sizeof(TCHAR) +
sizeof(ULONG64) - 1) /
sizeof(ULONG64)];
PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)buffer;
_tcscpy_s(szSymbolName, MAX_SYM_NAME, TEXT("WinMain"));
pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
pSymbol->MaxNameLen = MAX_SYM_NAME;
if (SymFromName(hProcess, szSymbolName, pSymbol))
{
// SymFromName returned success
}
else
{
// SymFromName failed
DWORD error = GetLastError();
_tprintf(TEXT("SymFromName returned error : %d\n"), error);
}
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Here is my code(object pascal): | Code: | function GetAddressFromSymbol(phd:Thandle;s:string):ptruint;
const
BSIZE = (sizeof(SYMBOL_INFO)+MAX_SYM_NAME*SizeOf(TCHAR)+SizeOf(ULONG64)-1) div SizeOf(ULONG64);
var
buffer:array[0..BSIZE-1]of ULONG64;
sn:array[0..MAX_SYM_NAME-1] of Char;
pi:PSYMBOL_INFO;
begin
if not SymInitialize(phd,nil,true) then
begin
MessageBox(0,pchar(SysErrorMessage(GetLastError)),'SymInit Error',MB_OK);
Exit($00000000);
end;
SymSetOptions(SymGetOptions or SYMOPT_CASE_INSENSITIVE);
ZeroMemory(@sn,SizeOf(sn));
ZeroMemory(@buffer,SizeOf(buffer));
sn := s;
pi := PSYMBOL_INFO(@buffer);
pi^.SizeOfStruct := SizeOf(SYMBOL_INFO);
pi^.MaxNameLen := MAX_SYM_NAME;
if SymFromName(phd,sn,pi) then
begin
result:=pi^.Address;
MessageBox(0,pchar(SysErrorMessage(GetLastError)),'Kidding Me!',MB_OK);
end else
begin
result:=$00000000;
MessageBox(0,pchar(SysErrorMessage(GetLastError)),'Last Error!',MB_OK);
end;
SymCleanup(phd);
end; |
The weird thing is that return value of SymFromName is true, but I got error message "The parameter is incorrect!" as the pic showing.At the same time, pi^.address value is $0000000
| Description: |
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25832
Location: The netherlands
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| Posted: Sun Dec 09, 2012 7:22 pm Post subject: |
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print out the size of SYMBOL_INFO in both pascal and C , make sure they are the same (for the same architecure)
I often find that the pascal headers aren't always 100% correct due to alignment issues which is why I copy the structures to my own units
http://code.google.com/p/cheat-engine/source/browse/Cheat+Engine+6/symbolhandler.pas?r=818 still uses SymFromName
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Alice0725
Expert Cheater
Reputation: 11
Joined: 24 Jul 2012
Posts: 145
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| Posted: Sun Dec 09, 2012 11:00 pm Post subject: |
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| Dark Byte wrote: | print out the size of SYMBOL_INFO in both pascal and C , make sure they are the same (for the same architecure)
I often find that the pascal headers aren't always 100% correct due to alignment issues which is why I copy the structures to my own units
http://code.google.com/p/cheat-engine/source/browse/Cheat+Engine+6/symbolhandler.pas?r=818 still uses SymFromName |
You are right , Dark Byte! The size is different, one is 84, the other one is 88. Thanks! Now, CETack 1.0 finished! 
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