如何在WinCE中通过C# DllImport创建win32 smartpone dll并调用

发布于 2024-11-27 01:31:37 字数 1201 浏览 10 评论 0原文

我需要实现一个Win32 DLL，并需要在WinCE 中通过C# DllImport 调用它。所以我创建了一个Win32智能设备项目并选择Windows Mobile 5.0 Smartphone SDK，并使用导出符号选项创建一个 dll 项目。然后我在函数声明之前添加 extern "C" 关键字：

#ifdef WINCE2_EXPORTS
#define WINCE2_API __declspec(dllexport)
#else
#define WINCE2_API extern "C" __declspec(dllimport)
#endif
extern "C" WINCE2_API int __cdecl Add(int A,int B);

.cpp

extern "C" WINCE2_API int __cdecl Add(int A,int B)
{
    return A+B;
}

当我在 C# 中使用 DllImport 时：

[DllImport("WinCE2.dll", EntryPoint = "Add")]
static extern int Add(int A, int B);

我总是在 WinCE 5.0 模拟器和 WinCE6.0 设备中遇到 System.MissingMethodException 。

我在google上搜索了一些信息，找到了一些解决方案。首先，在项目中添加.def：

LIBRARY     "WinCE2"
EXPORTS
Add         DATA

但是在论坛上有人说__declspec(dllexport)可以替换.def文件。但这个解决方案也遇到了System.MissingMethodException。

然后我在Stack Overflow上找到了解决方案：我需要添加 __cdecl 关键字吗？我创建了一个Win32 DLL项目，我发现项目设置默认会添加__cdecl。但 Win32 智能手机项目不是。所以我尝试了一下，但也得到了System.MissingMethodException。然后我在Win32 DLL中尝试相同的代码并通过C#调用，它可以工作。所以我不明白为什么wince不能工作。我已经将dll复制到wince可执行文件夹中有人可以分享一些经验给我吗？

原文

I need to implement a Win32 DLL and need call it by C# DllImport in WinCE.
So I create a Win32 Smart Device Project and choice Windows Mobile 5.0 Smartphone SDK,
and create a dll project with Export symbols option.
Then I add extern "C" key word before function declare:

#ifdef WINCE2_EXPORTS
#define WINCE2_API __declspec(dllexport)
#else
#define WINCE2_API extern "C" __declspec(dllimport)
#endif
extern "C" WINCE2_API int __cdecl Add(int A,int B);

.cpp

extern "C" WINCE2_API int __cdecl Add(int A,int B)
{
    return A+B;
}

When I use DllImport in C#:

[DllImport("WinCE2.dll", EntryPoint = "Add")]
static extern int Add(int A, int B);

I always got a System.MissingMethodException in WinCE 5.0 emulator and WinCE6.0 Device.

I searched some information on google, found some solution.
First, Add .def in project:

LIBRARY     "WinCE2"
EXPORTS
Add         DATA

But in a forum someone say __declspec(dllexport) can replace the .def file.
But this solution also got System.MissingMethodException.

Then I found a solution on Stack Overflow:
May I need add __cdecl key word.
And I created a Win32 DLL Project, I found the project setting will add __cdecl in default.
But Win32 Smartphone project is not.
So I try it, but also got System.MissingMethodException.
Then I try the same code in Win32 DLL and call by C#, it can work.
So I don't why wince can't work.
I had copied the dll to wince executable file folder
Can anyone share me some expeience?

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