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CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

and once you have those function pointer, you should replace

int rc = load_assembly_and_get_function_pointer(
    clrhost_lib_path.c_str(),
    clrhost_type,
    clrhost_init_method,
    clrhost_delegate, /* Delegate type name, if using non-standard delegate */
    nullptr,
    (void**)&fh_init);

int rc = load_assembly_and_get_function_pointer(
    clrhost_lib_path.c_str(),
    clrhost_type,
    clrhost_init_method,
    clrhost_delegate, /* Delegate type name, if using non-standard delegate */
    nullptr,
    (void**)&fh_init);

with something like

int rc = load_assembly(
    clrhost_lib_path.c_str(),
    nullptr,
    nullptr);

// error checking
int rc = get_function_pointer(
    clrhost_type,
    clrhost_init_method,
    clrhost_delegate, /* Delegate type name, if using non-standard delegate */
    nullptr,
    nullptr,
    (void**)&fh_init);

// error checking

int rc = load_assembly(
    clrhost_lib_path.c_str(),
    nullptr,
    nullptr);

// error checking
int rc = get_function_pointer(
    clrhost_type,
    clrhost_init_method,
    clrhost_delegate, /* Delegate type name, if using non-standard delegate */
    nullptr,
    nullptr,
    (void**)&fh_init);

// error checking

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

based on the sample i assume you copied it from, you probably have something like

rc = get_delegate_fptr(
    cxt,
    hdt_load_assembly_and_get_function_pointer,
    &load_assembly_and_get_function_pointer);

rc = get_delegate_fptr(
    cxt,
    hdt_load_assembly_and_get_function_pointer,
    &load_assembly_and_get_function_pointer);

and you need to instead have something like

get_delegate_fptr(
    cxt,
    hdt_load_assembly,
    &load_assembly);

get_delegate_fptr(
    cxt,
    hdt_get_function_pointer,
    &get_function_pointer);

get_delegate_fptr(
    cxt,
    hdt_load_assembly,
    &load_assembly);

get_delegate_fptr(
    cxt,
    hdt_get_function_pointer,
    &get_function_pointer);

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

indeed

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

right, because that is the behavior of load_assembly_and_get_function_pointer_fn

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

yes, this is back to where it was before. fhcore is loaded into both the component ALC and the default ALC

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

ok, this is what i expect to see

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

type.BaseType.Assembly

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

when it loads fhcore does you override return null or is assembly_path non-null

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

is one of them fhcore

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

can you log every asssembly you load in the override of Load

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

i still don't know how fhcore has sneaked into your custom ALC

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

there is documentation for what the methods all take here https://github.com/dotnet/runtime/blob/main/docs/design/features/native-hosting.md

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

and then you just use them

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

you acquire load_assembly and get_function_pointer in the same way that you acquire load_assembly_and_get_function_pointer_fn

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

there are the unit tests i guess https://github.com/dotnet/runtime/blob/f6b93319242155a72801a7bb4bc92faac2ada1a3/src/native/corehost/test/nativehost/host_context_test.cpp#L425

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

this is why you are seeing typeof(FhModule) inside that IsolatedComponentLoadContext thing. that is the one created by the host API

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

the load_assembly_and_get_function_pointer_fn creates a new ALC for each component that you load. since, you are supposed to be able to load multiple of them

73 replies

CC#

•Created by peppy on 5/1/2025 in #help

``Type.IsAssignableFrom`` returning false unexpectedly in plugin-loading scenario

i think what will be easier is to use load_assembly instead of load_assembly_and_get_function_pointer_fn in your host

73 replies

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