topic Re: Exception during IFC property hook execution Archicad 29 in Archicad C++ API

Exception during IFC property hook execution Archicad 29

Emkave — Mon, 15 Sep 2025 13:33:57 GMT

Hello guys. I was coding the hookers for Archicad 29 and something went wrong. I was following the examples in IFC_Test, and I wrote the code:

I have also executed this code that gave no errors:

IFCAPI::GetHookManager().RegisterPropertyHook(IFCHook::property_hook);

However, for some reason, after the ending of execution of property_hook(), I received this exception error:

I want also to point out that the ifc values were creating fine, without any errors. I was checking it a lot of times through the debugger.

Have someone dealt with this issue before? I would be glad if someone could point me to my mistake. Thank you in advance!

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 16 Sep 2025 10:28:31 GMT

Also I noticed that it is trying to load up IFCInOutAPI.pdb from somewhere. I went to check out in the devkit for AC29 and it does not exist there.

I also tried to search for IFCInOutAPI.dll, but it does not exist either

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 16 Sep 2025 10:29:05 GMT

And here is the debug message:

Exception code: C0000005 ACCESS_VIOLATION reading location: 0000000000000000 Fault address: 00007FF9CC1969FE 01:000059FE IFCInOutAPI.dll TOS address: 0000024C56406448 00:00000000 Registers: RAX:00000000000014C8 RBX:0000000000000000 RCX:903BE332AC2C0000 RDX:00007FF9B5F303C0 RSI:000000C6706FC930 RDI:0000024C98F82280 R8: 7FFFFFFFFFFFFFFC R9: 000000C6704BA000 R10:0000024C5FA70000 R11:000000C6706FAFE0 R12:000000C6706FD9D0 R13:0000000000000000 R14:0000000000000000 R15:000000C6706FC8B8 CS:RIP:0033:00007FF9CC1969FE SS:RSP:002B:000000C6706FC820 RBP:000000C6706FC8F0 DS:002B ES:002B FS:0053 GS:002B Flags:00010346 Floating point Registers: CTRL:027F STAT:0000 TAGS:0000 CS:RIP:0000:00000000E0A49EC1 DS:EDO:0000:0000000000004978 MxCsr:00001FA0 XMM0 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM1 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM2 = 0000000000000000000000003F400000 === +0.000000000000e+00 +5.242821631975e-315 === +7.500000e-01 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM3 = 00000000000000000000000040000000 === +0.000000000000e+00 +5.304989477413e-315 === +2.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM4 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM5 = 000000003A495041000000007373616C === +3.637369144105e+233 +1.254570642471e+16 === +1.928259e+31 +1.982856e+02 +7.679500e-04 +2.937459e+29 XMM6 = 00000000000000000000000047AE147B === +0.000000000000e+00 +2.000000000000e-02 === +8.912896e+04 +1.160000e+00 +0.000000e+00 +0.000000e+00 XMM7 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM8 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM9 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM10 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM11 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM12 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM13 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM14 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 XMM15 = 00000000000000000000000000000000 === +0.000000000000e+00 +0.000000000000e+00 === +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 Address space statistics: Available free memory: 130999.50 GB The number of free memory blocks: 1478 The average size of free memory blocks: 88.63 GB The number of free memory blocks < 10 kbyte: 64 (416.00 KB) The number of free memory blocks < 100 kbyte: 1151 (56460.00 KB) The number of free memory blocks < 1 Mbyte: 90 (41.87 MB) The number of free memory blocks < 10 Mbyte: 103 (395.59 MB) The number of free memory blocks < 100 Mbyte: 48 (1404.78 MB) The number of free memory blocks < 1 Gbyte: 10 (2.57 GB) The number of free memory blocks > 1 Gbyte: 12 (130995.07 GB) The biggest free block: 0x00003A4C00000000 46928.00 GB free 0x0000000000000000 NOACCESS

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 16 Sep 2025 20:19:28 GMT

I also tried this test code example. But it also gave the same exception error.

Re: Exception during IFC property hook execution Archicad 29

Emkave — Sun, 21 Sep 2025 19:04:53 GMT

Please someone expalin or share the way or explain why I do receive the exception! I will be very glad!

Re: Exception during IFC property hook execution Archicad 29

Hiromichi Shinkawa — Mon, 22 Sep 2025 02:18:55 GMT

Hi, please let me confirm what problem you're facing, did you mean you meet the error even using API29 Examples code? I noticed there are similar code like AddProperty() in IFCHook_Test.cpp.

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 23 Sep 2025 14:12:04 GMT

Hello. Thank you for the reply. The issue I face is when the PropertyHook function finishes its execution after I had put values into the property vector.

In this screenshot I am emplacing the test value. Then the execution line goes out of this function and Visual Studio complains about the exception:

I suspect that I have emplaced the property incorrectly, however I am sure I correctly understood the way it supposed to be according to the examples from Graphisoft.

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 23 Sep 2025 14:12:26 GMT

I have tried again; did read the examples and documentation and wrote this code:

however it still causes Archicad to crash with the same exception when the execution of PropertyHook ends.

Re: Exception during IFC property hook execution Archicad 29

Hiromichi Shinkawa — Wed, 24 Sep 2025 01:46:22 GMT

Hi, could you reproduced the same crash using the example code AddProperty() in IFCHook_Test.cpp?

Re: Exception during IFC property hook execution Archicad 29

Emkave — Wed, 24 Sep 2025 14:14:38 GMT

Yes. Crashed again when I tried to use AddProperty from IFCHook_Test.cpp.

I have literally copied and pasted their functionality.

Re: Exception during IFC property hook execution Archicad 29

BerndSchwarzenbacher — Thu, 25 Sep 2025 15:09:33 GMT

It's hard to say without running your exact example myself. But I've successfully compiled and run the IFCHOOK_Test example without crashes.

My first guess is, that you need to make your hook a static function because the function needs to stay available. Something like:

static void IFCHook::PropertyHook1(const ......) { ... }

Let us know if this solves the issue.

Bernd

Re: Exception during IFC property hook execution Archicad 29

Emkave — Thu, 25 Sep 2025 15:50:42 GMT

Having the following code:

template<typename TValue> static void AddProperty(std::vector<IFCAPI::Property>& properties, const GS::UniString& setName, const GS::UniString& name, const GS::UniString& valueType, const TValue& value) { auto apiValue = IFCAPI::GetPropertyBuilder().CreateValue(valueType, value); if (apiValue.IsOk()) { auto apiProperty = IFCAPI::GetPropertyBuilder().CreatePropertySingleValue(setName, name, *apiValue); if (apiProperty.IsOk()) properties.emplace_back(*apiProperty); } } static void AddTextProperty(std::vector<IFCAPI::Property>& properties, const GS::UniString& setName, const GS::UniString& name, const GS::UniString& valueType, const GS::UniString& value) { AddProperty(properties, setName, name, valueType, value); } void IFCHook::PropertyHook1(const IFCAPI::ObjectID& objectID, std::vector<IFCAPI::Property>& properties) noexcept { AddTextProperty(properties, "Sample Property Set", "Sample Property", "IfcLabel", "Hello from IFC Hook!"); AddProperty(properties, "Sample Property Set", "Sample Integer Property", "IfcInteger", (Int64)12345); } void IFCHook::Enable() noexcept { auto res = IFCAPI::GetHookManager().RegisterPropertyHook(IFCHook::PropertyHook1); if (!res.IsOk()) { throw "Unable to register property hook."; } }

...still causes a crash. I just place a chair, trying to check out its properties and it crashes.

P.S. IFCHook::PropertyHook1 is already static as it is declared in such a way in IFCHook class.

Re: Exception during IFC property hook execution Archicad 29

BerndSchwarzenbacher — Fri, 26 Sep 2025 14:57:54 GMT

Hm... weird! Can you show the call stack when the crash happens?

Re: Exception during IFC property hook execution Archicad 29

Emkave — Sat, 27 Sep 2025 19:12:28 GMT

This is where it jumps after finishing the execution of IFCHook::PropertyHook1()

And this is when it is 1 Step Over behind the crash

Re: Exception during IFC property hook execution Archicad 29

Emkave — Mon, 29 Sep 2025 08:35:41 GMT

My suspection is that possibly the value that I put into the vector gets disappeared from the std::vector. Hence I get the crash for reading the invalid address.

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 30 Sep 2025 18:37:22 GMT

Btw. When I copied the entire test code and tried to test it out, it would also crash Archicad for read access violation.

It happens in this loop, on 5th iteration:

static void PropertyHookCommon(const IFCAPI::ObjectID& objectID, std::vector<IFCAPI::Property>& properties, const GS::UniString namePostfix) { API_Element apiElement{}; GS::UniString infoString; if (GetAPIElement(objectID, apiElement, &infoString)) { // create scheme property after every infoString character for (auto index : GS::InRange((UIndex)0, infoString.GetLength())) { if (infoString[index].IsWhiteSpace()) continue; GS::UniString character = infoString.GetSubstring(index, 1); GS::UniString propertySetName = "PSet_InfoString"; GS::UniString propertyName = character; propertySetName.Append(namePostfix); propertyName.Append(namePostfix); AddTextProperty(properties, propertySetName, propertyName, "IfcLabel", character); } } }

Re: Exception during IFC property hook execution Archicad 29

BerndSchwarzenbacher — Tue, 30 Sep 2025 06:20:11 GMT

OK, I just saw a possible solution. Are you making a Debug build? Try compiling it as a Release build.

Somebody else seemed to have a very similar problem in AC29 TP and this was their solution. (https://community.graphisoft.com/t5/Graphisoft-Technology-Preview/Crashes-when-invoking-property-hook-Error-2147483639/m-p/678075#M562)

This relates to an issue I had a while back with Debug builds. Check this post to see how you can adapt your Debug build once you've confirmed that it was the issue by trying the Release build: https://community.graphisoft.com/t5/Archicad-C-API/Crash-for-GetOrganizationIds-in-DEBUG-builds-linked-to-ACAP/td-p/646824

Re: Exception during IFC property hook execution Archicad 29

Emkave — Tue, 30 Sep 2025 11:41:14 GMT

Hello. Yes, it works now with Release build. Thank you a lot! Now I really wonder why my issue appeared in the first place...

I will try fix the Debug now. Thank you and everybody else here a lot!

Re: Exception during IFC property hook execution Archicad 29

Akos Somorjai — Thu, 13 Nov 2025 10:22:26 GMT

Best, Akos