The VideoLAN Forums

Hello,

it seems that the ActiveX control, that comes with the precompiled W32 VLC version has a static breakpoint build into the "play"-procedure.
This causes the debugger to break twice for every new file that has been opened.

Since I cannot recompile VLC myself, I would really apprechiate if you could remove this breakpoint from the precompiled ActiveX - I'm sure other developers will agree with me on that

Thanks!
Jessica

they are no static breakpoints in VLC, however the interruption could be attributed to some incompatibilties between VLC and the programming language you are using, could you be a more detailed on your problem ?

moreover, you could enable the logger interface by setting it up in the preferences panel of VLC player; the activex control will re-use any saved settings, this could help you see what VLC is doing

Dear Quovodis,

thanks for your comment. I now found out how to bypass this problem:

Im im using Delphi 7. The problem does NOT seem to be related to VLC in particular.

Microsoft indeed seems to have forgotten a few DbgBreakPoint in ntdll. For other stuggling developers, here is the workaround:

procedure PatchINT3;
var
NOP : Byte;
NTDLL: THandle;
BytesWritten: DWORD;
Address: Pointer;
begin
if Win32Platform <> VER_PLATFORM_WIN32_NT then Exit;
NTDLL := GetModuleHandle('NTDLL.DLL');
if NTDLL = 0 then Exit;
Address := GetProcAddress(NTDLL, 'DbgBreakPoint');
if Address = nil then Exit;
try
if Char(Address^) <> #$CC then Exit;

NOP := $90;
if WriteProcessMemory(GetCurrentProcess, Address, @NOP, 1, BytesWritten) and
(BytesWritten = 1) then
FlushInstructionCache(GetCurrentProcess, Address, 1);
except
//Do not panic if you see an EAccessViolation here, it is perfectly harmless!
on EAccessViolation do ;
else raise;
end;
end;

initialization


if DebugHook<>0 then
PatchINT3;

end.


Cheers,
jessica