C＃ - 从C ++ Dll接收数据的问题 [英] C# - Problem to receive data from a C++ Dll

问题描述

我有一个C＃程序，想要调用一个dll，但是从dll接收

数据有问题。 />

dll声明如下：

" extern" C" void GetSN（TCHAR ** pData）"


Dll调用如下：

[DllImport（" mydll.dll"）]

private static extern void GetSN（ref string [] val1）;

....

string [] valueStr = new string [6];

....

GetSN（ref valueStr）;


我有以下错误：

"发生了一个非托管异常：''System.NotSupportedException''"


有没有人知道这个问题？

谢谢你提前回答。

Hi,

I have a C# program and want to call a dll, but have problem to receive the
data from the dll.

The dll declaration is the following :
"extern "C" void GetSN(TCHAR** pData)"

The Dll call is the following :
[DllImport("mydll.dll")]
private static extern void GetSN(ref string[] val1);
....
string[] valueStr = new string[6];
....
GetSN(ref valueStr);

I have the following error :
"An unmanaged exception was happened : ''System.NotSupportedException''"

Does anybody have an idea of the problem ?
Thanks in advance for any answer.

推荐答案

我对此不太确定，但你确定你可以换一个字符串

数组到一个char数组？


这是我从你的代码中看到的：

" extern" C" void GetSN（TCHAR ** pData）" < - 指向一个TCHAR

数组

string [] valueStr = new string [6]; < - 一个字符串数组

....

GetSN（ref valueStr）< - 你正在通过引用发送一个字符串数组

（指向指向字符的指针的指针......）


异常表示不支持调用的方法。

基本上，它没有识别你的功能GetSN。


就像我说的，我不确定这一点。但你可以查看你的

代码并验证这一点。

I''m not too sure about this, but are you sure you can convert a string
array to a single char array?

This is what I see from your code:
"extern "C" void GetSN(TCHAR** pData)" <--takes a pointer to a TCHAR
array

string[] valueStr = new string[6]; <-- a string array
....
GetSN(ref valueStr) <-- you''re sending a string array by reference
(pointer to a pointer to a pointer to a character....)

The exception means that the invoked method is not supported.
Basically, it is not recognising your function GetSN.

Like I said, I''m not certain about this. But you can look into your
code and verify this.

你可能是对的，但我不知道我可以使用哪种类型的变量。


我也问我别的东西：我正在使用的dll是嵌入式Visual C ++ 3.0创建的一个dll，我希望在Pocket PC 2003上使用它。

设备......

我知道eVC ++ 3.0与Pocket PC 2002兼容，但我不知道它是否与Pocket PC 2003兼容。


Tegdeep写道：

Hi,

You are probably right but I don''t know which type of variable I can use.

I''m asking me something else also : the dll I''m using is a dll which was
created by embedded Visual C++ 3.0 and I want to use it on a Pocket PC 2003
device....
I know that eVC++3.0 is compatible with Pocket PC 2002 but I don''t know if
it''s compatible with Pocket PC 2003.

"Tegdeep" wrote:

我对此不太确定，但你确定你可以将字符串
数组转换为单个字符数组吗？
externC" void GetSN（TCHAR ** pData）" < - 指向一个TCHAR
数组

string [] valueStr = new string [6]; < - 一个字符串数组
....
GetSN（ref valueStr）< - 你正在通过引用发送一个字符串数组
（指向指针的指针）一个字符....）

异常意味着不支持调用的方法。
基本上，它不能识别你的函数GetSN。

喜欢我说，我不确定这个。但你可以查看你的代码并验证这一点。

I''m not too sure about this, but are you sure you can convert a string
array to a single char array?

This is what I see from your code:
"extern "C" void GetSN(TCHAR** pData)" <--takes a pointer to a TCHAR
array

string[] valueStr = new string[6]; <-- a string array
....
GetSN(ref valueStr) <-- you''re sending a string array by reference
(pointer to a pointer to a pointer to a character....)

The exception means that the invoked method is not supported.
Basically, it is not recognising your function GetSN.

Like I said, I''m not certain about this. But you can look into your
code and verify this.

我认为你可以使用char类型变量而且它'当你调用这个函数时，我会把一个转换为

本身转换为TCHAR。 eVC ++ 3.0应该与PocketPC2003兼容
。


祝你好运。

I think you can use a char type variable and it''ll do a conversion by
itself to TCHAR when you call the function. eVC++3.0 should be
compatible with PocketPC2003.

Good Luck.

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