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Troubleshooting PInvoke Related Issues
I am back with some more PInvoke Stuff. Recently I was working on a PInvoke issue which I found interesting.
I have a C++ dll which has a function whose signature is
int TestFunc(IN_STRUCT in_Params, RET_STRUCT * pret_Par).
I wanted to call this function from C#. Function has two arguments. First argument is input structure which will be filled from C# code and passed to C++ code. Second argument is output structure which is filled in C++ code and output to C# code.
Here are the C struct definitions and a function that needs to be marshaled
#include "stdafx.h"
#include <stdio.h>
#include "Objbase.h"
#include <malloc.h>
typedef struct IN_STRUCT
{
BYTE CMD_PType;
BYTE CMD_PTType;
BYTE CMD_OC;
BYTE CMD_Seq;
};
typedef struct RET_STRUCT
{
BYTE RET_OC;
BYTE RET_Seq;
BYTE RET_RetBytes;
char *str;
BYTE RET_PD[10];
};
extern "C" __declspec(dllexport) \
int TestFunc(IN_STRUCT in_Params, RET_STRUCT * pret_Par)
{
int iRet = 0;
pret_Par->RET_OC = in_Params.CMD_OC;
pret_Par-
相关文档：
public string WriteXML(string[] values, int flag)
{
//如果flag==0则为第一次运行需要初始化XML文件
if (flag == 0)
{
//生在随机文件名
string dateName = System.DateTime.Now.ToString("yyyyMMddHHmmss");
......
一．类与结构的示例比较：
结构示例：
public struct Person
{
string Name;
int height;
int weight
public bool overWeight()
{
//implement something
}
}
类示例：
public class TestTime
{
int hours;
int minutes;
int seconds;
public void passtime()
{
//implementation ......
先声明，我不是这方面的专家，只是干软件四个月不知天有多高地有多硬的小孩子
首先，类型转换是有一定开销的
我试过这样的代码：这是一个控制台应用程序的Program类的代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 类型转换的开销
{
class Program
......
你首先要理解一下概念：
一 类型(Type) 对象是什么
比如 object x; x是对象，object就是它的类型，在程序中如何描述类型这个概念呢？
就是Type(System.Type)。要获取某个类的类型可以用typeof()操作符
object a;object b; DataTable t;
aType = typeof(object);Type bType = typeof(object);tType = typ ......
1 创建C# DLL，需要指定应用类型为“类库”，代码：
namespace CSLib
{
public class Class1
{
private string name;
public string Name
......
