从本机代码使用SendMessage返回字符串 [英] Return string using SendMessage from native code

问题描述

大家好，

在C＃系统服务中，我需要通过SendMessage（）API调用从MFC主机获取一些字符串

窗口。我设法发送消息，但是可以

找不到将字符串返回到C＃app的方法。

是否可以从返回值接收字符串返回值，wparam

或lparam？


如果有人这样做，请发布示例，


我会非常感激，

罗马

解决方案

罗马，


是的，它是。您可以将参数（lParam或wParam）声明为

StringBuilder实例（因为我假设MFC代码只写入已经分配的
内存。如果是

声明SendMessage API。


希望这会有所帮助。

-

- Nicholas Paldino [.NET / C＃MVP]

- mv*@spam.guard .caspershouse.com


< mu ****** @ hotmail.com>在消息中写道

news：11 ********************** @ g49g2000cwa.googlegr oups.com ...

大家好，

在C＃系统服务中，我需要通过SendMessage（）API调用从MFC主机窗口获取一些字符串。我设法发送消息，但是无法找到将字符串返回到C＃app的方法。
是否可以从C＃中返回字符串返回值，wparam
或lparam？

如果有人这样做，请发布示例，

我将不胜感激，
罗马

< blockquote>谢谢，为了快速响应，

实际上我是这样做的：

C＃side

StringBuilder sb = new StringBuilder（256）;

SendMessage（process.MainWindowHandle，WM_GET_AUTH_MEMBER，0，sb）;


C ++方

CString member =" SomeString" ;

strcpy（（char *）lParam，member.GetBuffer（））;


然后在C＃方面sb尚未更改

有什么想法吗？

谢谢

您对SendMessage的声明是什么？

- -

- Nicholas Paldino [.NET / C＃MVP]

- mv * @ spam.gua rd.caspershouse.com


< mu ****** @ hotmail.com>在消息中写道

news：11 ********************** @ g14g2000cwa.googlegr oups.com ...

谢谢，为了快速回复，
实际上我是这样做的：
C＃side
StringBuilder sb = new StringBuilder（256）;
SendMessage（process.MainWindowHandle， WM_GET_AUTH_MEMBER，0，sb）;

C ++方
CString成员=" SomeString" ;;
strcpy（（char *）lParam，member.GetBuffer（））;

那么在C＃方面sb还没有改变
有什么想法吗？
谢谢

Hi all,

In C# system service I need to get some string from MFC mainframe
window by SendMessage() API call. I managed to send message, but can
not find the way to return string to C# app.
Is that possible to receive string back in C# from return value, wparam
or lparam?

Please if someone did it post the example,

I would greatly appreciate,
Roman

解决方案

Roman,

Yes, it is. You can declare the parameter (lParam or wParam) as a
StringBuilder instance (since I assume that the MFC code is only writing to
memory that is already allocated. If it is not, then shame on it) when
declaring the SendMessage API.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

<mu******@hotmail.com> wrote in message
news:11**********************@g49g2000cwa.googlegr oups.com...

Hi all,

In C# system service I need to get some string from MFC mainframe
window by SendMessage() API call. I managed to send message, but can
not find the way to return string to C# app.
Is that possible to receive string back in C# from return value, wparam
or lparam?

Please if someone did it post the example,

I would greatly appreciate,
Roman

Thanks, for quick response,
actually I did it like this:
C# side
StringBuilder sb = new StringBuilder(256);
SendMessage(process.MainWindowHandle, WM_GET_AUTH_MEMBER, 0, sb);

C++ side
CString member = "SomeString";
strcpy((char*)lParam, member.GetBuffer());

Then on C# side sb has not been changed
Any idea ?
Thanks

What is your declaration of SendMessage?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

<mu******@hotmail.com> wrote in message
news:11**********************@g14g2000cwa.googlegr oups.com...

Thanks, for quick response,
actually I did it like this:
C# side
StringBuilder sb = new StringBuilder(256);
SendMessage(process.MainWindowHandle, WM_GET_AUTH_MEMBER, 0, sb);

C++ side
CString member = "SomeString";
strcpy((char*)lParam, member.GetBuffer());

Then on C# side sb has not been changed
Any idea ?
Thanks

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