我正试图使用一个结构数组将数据传递到/从我的C#ui和C dll。
更复杂的是,该结构包含另一组结构。
我已经知道如何使用pinvoke来处理更简单的东西,但是我该如何声明
嵌入的结构,我如何通过它们?
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class csForm {
public int endDate;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public char[] formId;
}
[DllImport("myDll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public static extern void fillForm([In, Out] csForm data, 5);
// c code
typedef struct s_ptxRow {
int ptxNumber;
char primitive[128];
int primitiveParams[128];
} ptxRow;
typedef struct s_workSpace{
char formId[128];
int endDate;
ptxRow PtxRow[128];
} cForm;
extern "C" __declspec(dllexport) fillForm(cForm csForm[], interface csFormCount)
{
for (int i = 0, j = 0; i < csFormCount; ++i)
{
j = int / 2;
csForm[i].endDate = i;
strcpy(csForm[i].formId, "formId here");
csForm[i].PtxRow[j].ptxNumber = i;
csForm[i].PtxRow[j].primitiveParams[i] = i;
strcpy(csForm[i].PtxRow[j].primitive, "someText");
}
}
最佳答案
你走的方向是对的您只需要在C中声明ptxRow
结构,然后将其数组添加到csForm
您甚至不需要预先分配任何数组—显然P/Invoke为您分配数组,因为它知道数组的大小由于某些声明中存在微小错误,因此包含了整个示例代码。
注意:当我尝试使用C类中的类时,我得到了奇怪的结果(例如C++代码中的错误成员和指针值),这导致了各种错误。切换到结构使问题消失我认为这与参考和价值类型有关,但希望更多知识渊博的人能提供意见。如果重要的话,我正在用.NET 3.5测试。
#include <string.h>
typedef struct s_ptxRow {
int ptxNumber;
char primitive[128];
int primitiveParams[128];
} ptxRow;
typedef struct s_workSpace {
char formId[128];
int endDate;
ptxRow PtxRow[128];
} cForm;
extern "C" __declspec(dllexport) void fillForm(cForm csForm[], int csFormCount)
{
for (int i = 0, j = 0; i < csFormCount; ++i)
{
j = i / 2;
csForm[i].endDate = i;
strcpy(csForm[i].formId, "formId here");
csForm[i].PtxRow[j].ptxNumber = i;
csForm[i].PtxRow[j].primitiveParams[i] = i;
strcpy(csForm[i].PtxRow[j].primitive, "someText");
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace PInvokeStructsCS
{
class Program
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct PtxRow
{
public int ptxNumber;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public char[] primitive;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public int[] primitiveParams;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct csForm
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public char[] formId;
public int endDate;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 128)]
public PtxRow[] ptxRow;
}
[DllImport("PInvokeStructsC.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
public static extern void fillForm([In, Out]csForm[] data, int count);
static void Main(string[] args)
{
csForm[] forms = new csForm[2];
try
{
fillForm(forms, 2);
}
catch (Exception e)
{
Console.Out.WriteLine(e.Message);
return;
}
}
}
}
关于c# - 使用pinvoke将struct数组内的C struct的嵌入式数组传递给C#,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/11946895/