VB.Net中的Char指针 [英] Char pointer in VB.Net

问题描述

您好我有一个C ++ DLL。

我正在做的是我将内存地址传递给我的C ++ dll，它在该地址上写入消息，我想从该内存地址读取消息。

这是我的C ++函数。

Hi i have a C++ DLL.
What i am doing is that i am passing memory address to my C++ dll where it write message on that address and i want to read the message from that memory address.
Here is my C++ function.

int _stdcall Test(int res, wchar_t *text)

现在在我的C＃中.Net测试app ..如果我使用不安全的char * ..我得到正确的输出。

Now in my C#.Net test app .. if i use unsafe char* .. i am getting proper output.

//Declaration
static extern unsafe int Test(char* msg); 
//Implementation
char* SerrMsg = stackalloc char[255];
Test(sMsg);
string emsg = new string(sMsg);

现在在vb.net中实现我使用stringbuilder获得第j个字符。

Now implementing in vb.net i am getting jst 1st character by using stringbuilder.

//Dec
Private Shared Function Test(ByVal msg As StringBuilder) As Integer
//Imp
Dim sMsg As New StringBuilder(400)
Test(sMsg)
eMsg= sMsg.ToString()

VB.Net中char *的替代品是什么？

帮助将不胜感激。

谢谢

What is the replacement for char* in VB.Net ?
Help would be appreciated.
Thanks

推荐答案

这是一个 CharSet 问题， StringBuilder 是托管类型的正确选择。



在VB中使用 DllImport 时，记得设置 CharSet 到 Unicode ！

It's a CharSet issue here, StringBuilder is the right choice of managed type.

When you use DllImport in VB, remember to set the CharSet to Unicode!

Dim sMsg As IntPtr = IntPtr.Zero或

Dim sMsgAs新的StringBuilder（1234567890，400）或

Dim rsp（400）As Byte



数据返回需要查看是否需要转换为ASCII或只是sMsg.ToString。

Dim sMsg As IntPtr = IntPtr.Zero or
Dim sMsgAs New StringBuilder("1234567890", 400) or
Dim rsp(400) As Byte

The data return need to see whether need to convert to ASCII or just sMsg.ToString.

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