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how to use properly GetMethodIdByXXX ?

kunitoki · 2006-04-07T17:49:41

i'm trying to call a method of a scripted class from within a c function. i don't know how to use these cool functions. i mean, i don't know if i have to pass a object name (from the docs is stated as class name, but sure it isn't) that is already been declared. the script is doing: class Component { void mouseDown(int x, int y) { // do something } }; Component c; the c++ counterpart is trying to (after compiling the script bounded with no module): int onMouseDownID = eng->GetMethodIDByDecl(0, "c", "void mouseDown(int,int)" ); if (onMouseDownID >= 0) { con->Prepare(onMouseDownID); con->SetArgDWord(0, e.x); con->SetArgDWord(1, e.y); con->Execute(); } but i still get onMouseDownID == -12... i've tried to change "c" with "Component" as one should learn from the docs... but obviously nothing happens. anyway the script is correctly compiling and executing a previously declared main function, and the context isn't released after main execution. maybe i have to take into account the script section name ? or i have to move the "c" allocation (in script) to a function that i have to call after ?

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Started by kunitoki April 04, 2006 06:01 PM

11 comments, last by kunitoki 18 years, 2 months ago

WitchLord

4,838

April 07, 2006 09:52 AM

Seems to be a buffer overflow within the library. I'm glad you managed to narrow the problem down to this, as it would have been very difficult to find otherwise.

I'll make some tests and fix whatever bug I find. I'll let you know as soon as it's done.

Regards,
Andreas

AngelCode.com - game development and more - Reference DB - game developer references
AngelScript - free scripting library - BMFont - free bitmap font generator - Tower - free puzzle game

WitchLord

4,838

April 07, 2006 03:46 PM

I found the problem. I had forgotten to add parenthesis around a ?: operator. This caused the stackFramePointer to be invalid, which in turn caused the buffer overflow in the SetArgDWord() methods.

Line 286 in file as_context.cpp, function Prepare(), should be:

argumentsSize = currentFunction->GetSpaceNeededForArguments() + (currentFunction->objectType ? PTR_SIZE : 0);

Thanks for helping me with this bug. [smile]

I'm updating the SVN on SourceForge.net right now.

Regards,
Andreas

AngelCode.com - game development and more - Reference DB - game developer references
AngelScript - free scripting library - BMFont - free bitmap font generator - Tower - free puzzle game