我在Mono Embed示例的基础上尝试调用更新结构的C＃程序集中的方法。该结构有1个int数组。这是在Linux系统上。
访问c＃中的int数组字段会导致分段错误。只检查字段是否为空就足以导致错误。
当我在C＃中进行内部封送模拟时，将结构转换为字节然后再转换回结构，这可以正常工作。
单声道版本：3.2.3
我已经在下面提供了c＃和c代码，如果需要，可以根据要求提供更多信息。
这是c代码......
#include <mono/jit/jit.h>
#include <mono/metadata/object.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/assembly.h>
#include <mono/metadata/debug-helpers.h>
#include <string.h>
#include <stdlib.h>
#ifndef FALSE
#define FALSE 0
#endif
struct STRUCT_Test
{
int IntValue1[2];
};
int
main (int argc, char* argv[]) {
MonoDomain *domain;
MonoAssembly *assembly;
MonoClass *klass;
MonoObject *obj;
MonoImage *image;
const char *file;
int retval;
if (argc < 2){
fprintf (stderr, "Please provide an assembly to load\n");
return 1;
}
file = argv [1];
domain = mono_jit_init (file);
assembly = mono_domain_assembly_open(domain, file);
if (!assembly)
exit(2);
image = mono_assembly_get_image(assembly);
klass = mono_class_from_name(image, "StructTestLib", "StructReader");
if (!klass) {
fprintf(stderr, "Can't find StructTestLib in assembly %s\n", mono_image_get_filename(image));
exit(1);
}
obj = mono_object_new(domain, klass);
mono_runtime_object_init(obj);
{
struct STRUCT_Test structRecord; memset(&structRecord, 0, sizeof(struct STRUCT_Test));
void* args[2];
int val = 277001;
MonoMethodDesc* mdesc = mono_method_desc_new(":ReadData", FALSE);
MonoMethod *method = mono_method_desc_search_in_class(mdesc, klass);
args[0] = &val;
args[1] = &structRecord;
structRecord.IntValue1[0] = 1111;
structRecord.IntValue1[1] = 2222;
mono_runtime_invoke(method, obj, args, NULL);
printf("IntValue1: %d, %d\r\n", structRecord.IntValue1[0], structRecord.IntValue1[1]);
}
retval = mono_environment_exitcode_get ();
mono_jit_cleanup (domain);
return retval;
}
这是c＃代码......
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace StructTestLib
{
[StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Ansi)]
public struct STRUCT_Test
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
public Int32[] IntValue1;
}
public class StructReader
{
public void ReadData(int uniqueId, ref STRUCT_Test tripRecord)
{
if (tripRecord.IntValue1 != null)
Console.WriteLine("IntValue1: " + tripRecord.IntValue1[0] + ", " + tripRecord.IntValue1[1]);
else
Console.WriteLine("IntValue1 is NULL");
tripRecord.IntValue1[0] = 3333;
tripRecord.IntValue1[1] = 4444;
}
}
}
答案 0 :(得分：1)
糟糕！我的无知！
似乎我对编组的理解不正确。基于原始数组的数据类型（字符串，long []）无法直接封送。 c结构必须具有Monoxxx *类型作为运行时的成员才能正确编组。
使用MonoString * StringValue1而不是char StringValue1 [31]和MonoArray * IntArray而不是int IntArray [2]允许编组正常工作。
以下是我最终的结果 我真的需要传递来自c的原始结构而没有结构内的所有“单声道”行李，我正在尝试使用现有的c结构而不改变它们。我能够通过使用“不安全”的c＃代码并允许将结构本身的地址传递给c＃方法来实现这一点。这允许在c＃中操作原始内存，并为c＃编组提供完全的自由，将字节转换为struct，反之亦然。
c＃code
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using EmpireCLS.Comm;
namespace StructTestLib
{
[StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Ansi)]
public struct STRUCT_Test
{
public Int32 IntValue1;
public Int32 IntValue2;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
public string StringValue1;
}
public class StructReader
{
unsafe public void ReadDataRaw(int uniqueId, void* tripRecordPtr)
{
STRUCT_Test tripRecord = (STRUCT_Test)Marshal.PtrToStructure((IntPtr)tripRecordPtr, typeof(STRUCT_Test));
tripRecord.IntValue1 = 3333;
tripRecord.IntValue2 = 4444;
Console.WriteLine("c# StringValue1: " + tripRecord.StringValue1);
tripRecord.StringValue1 = "fghij";
GCHandle pinnedPacket = new GCHandle();
try
{
int structSizeInBytes = Marshal.SizeOf(typeof(STRUCT_Test));
byte[] bytes = new byte[structSizeInBytes];
pinnedPacket = GCHandle.Alloc(bytes, GCHandleType.Pinned);
Marshal.StructureToPtr(tripRecord, pinnedPacket.AddrOfPinnedObject(), true);
Marshal.Copy(bytes, 0, (IntPtr)tripRecordPtr, bytes.Length);
}
finally
{
if (pinnedPacket.IsAllocated)
pinnedPacket.Free();
}
}
}
}
c code
#include <mono/jit/jit.h>
#include <mono/metadata/object.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/assembly.h>
#include <mono/metadata/debug-helpers.h>
#include <string.h>
#include <stdlib.h>
#ifndef FALSE
#define FALSE 0
#endif
struct STRUCT_Test
{
int IntValue1;
int IntValue2;
char StringValue1[20];
};
int
main (int argc, char* argv[]) {
MonoDomain *domain;
MonoAssembly *assembly;
MonoClass *klass;
MonoObject *obj;
MonoImage *image;
const char *file;
int retval;
if (argc < 2){
fprintf (stderr, "Please provide an assembly to load\n");
return 1;
}
file = argv [1];
domain = mono_jit_init (file);
assembly = mono_domain_assembly_open(domain, file);
if (!assembly)
exit(2);
image = mono_assembly_get_image(assembly);
klass = mono_class_from_name(image, "StructTestLib", "StructReader");
if (!klass) {
fprintf(stderr, "Can't find StructTestLib in assembly %s\n", mono_image_get_filename(image));
exit(1);
}
obj = mono_object_new(domain, klass);
mono_runtime_object_init(obj);
{
struct STRUCT_Test structRecord; memset(&structRecord, 0, sizeof(struct STRUCT_Test));
void* args[2];
int val = 277001;
char* p = NULL;
MonoMethodDesc* mdesc = mono_method_desc_new(":ReadDataRaw", FALSE);
MonoMethod *method = mono_method_desc_search_in_class(mdesc, klass);
args[0] = &val;
args[1] = &structRecord;
structRecord.IntValue1 = 1111;
structRecord.IntValue2 = 2222;
strcpy(structRecord.StringValue1, "abcde");
mono_runtime_invoke(method, obj, args, NULL);
printf("C IntValue1: %d, %d\r\n", structRecord.IntValue1, structRecord.IntValue2);
printf("C StringValue: %s\r\n", structRecord.StringValue1);
}
retval = mono_environment_exitcode_get ();
mono_jit_cleanup (domain);
return retval;
}
答案 1 :(得分：0)
尝试将StringValue1作为一个字符数组传递，因为这是您在C程序中实际定义的内容。
答案 2 :(得分：0)
mono_runtime_invoke（）不进行任何类型的编组操作（如果您反过来并使用内部调用，则相同）。
只有P / Invoke方法执行数据编组。