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C#: Object with custom marshaller not containing data after PInvoke call


C#: Object with custom marshaller not containing data after PInvoke call

By : Chris
Date : January 10 2021, 01:57 PM
Does that help There are several mistakes in the code and the declarations that prevents this code from working on a 64-bit operating system. Be sure to set the Platform Target to x86.
Are you sure the native function actually returns data? What is the Result return value? A non-zero value indicates failure.
code :


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Why does my C#/pinvoke DeviceIoControl call return 0 bytes read with garbage data?

Why does my C#/pinvoke DeviceIoControl call return 0 bytes read with garbage data?


By : Statbot
Date : March 29 2020, 07:55 AM
Does that help I have an unmanaged C++ Windows console app that works fine. I want it in C#. I have done DllImport statements for the necessary Kernel32.dll symbols: , You have mistype, try this:
code :
internal const uint IoCtlDiskGetDriveGeometry = 0x70000;
A call to PInvoke function has unbalanced the stack. This is likely because the managed PInvoke .. (.NET 4)

A call to PInvoke function has unbalanced the stack. This is likely because the managed PInvoke .. (.NET 4)


By : Ankistein
Date : March 29 2020, 07:55 AM
I wish this helpful for you My project run successful without errors in .NET Frame work 3.5. But, When I target it to .NET Frame work 4. I got the error: , Add this along with dll import.
code :
, CallingConvention = CallingConvention.Cdecl)]
using custom Marshaller in F#

using custom Marshaller in F#


By : KhatskevichVera
Date : March 29 2020, 07:55 AM
around this issue Looking at the compiler code, it seems the F# team couldn't really make up their mind about this:
code :
| 0x2C -> 
    error(Error(FSComp.SR.ilCustomMarshallersCannotBeUsedInFSharp(),m))
    (* ILNativeType.Custom of bytes * string * string * bytes (* GUID,nativeTypeName,custMarshallerName,cookieString *) *)
    //ILNativeType.Error  
Gocql custom marshaller

Gocql custom marshaller


By : Suraj Mishra
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have a table with a tuple column that is made up of an int64 paired with a uuid: , As you mentioned, you are getting the following error:
code :
type MyID struct {
    Id  int64
    Uid  gocql.UUID
}
Is there a way to use Marshaller in Grails to parse JSON string into a custom object

Is there a way to use Marshaller in Grails to parse JSON string into a custom object


By : user3691899
Date : March 29 2020, 07:55 AM
should help you out I am trying to parse a JSON String to my custom object I already have a Marshaller class to go from the object to JSON and was wondering if it possible to use it for parsing in other direction as well instead of using JsonSlurper didn't see any clear documentation on that or any other JSON to object mapping api that is not includes writing code using JsonSlurper to manually create objects , groovy supports simple mapping like this:
code :
import groovy.json.JsonSlurper
import groovy.json.JsonOutput

class A{
    int id
    String name
}

Map m = new JsonSlurper().parseText('{"id":123,"name":"Joe"}')
A a = m as A
assert a.id==123
assert a.name=="Joe"

def json = JsonOutput.toJson(a)
assert json == '{"id":123,"name":"Joe"}'
@Grab(group='com.google.code.gson', module='gson', version='2.8.5')
import com.google.gson.Gson

class A{
    int id
    String name 
}

A a=new Gson().fromJson('{"id":123,"name":"Joe"}', A.class)
assert a.id==123
assert a.name=="Joe"

def json = new Gson().toJson(a)
assert json == '{"id":123,"name":"Joe"}'
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