如何将char数组转换为const char * [英] How do I convert a char array to const char*
问题描述
大家好，
我需要将char数组，char UniqueID [88]转换为const char *
实际上有一个数据契约类型字符串，C＃中的UniqueID。
我在另一个文件中有一个extern char UniqueID [LEN]，我可以在我的cpp文件中访问
，我们需要将它从托管C ++传递给C＃。 br />
所以我想按照以下方式做。但是不能成功。
DataContracts :: InformDataContract ^ InformDataContract = gcnew DataContracts :: InformDataContract（）;
InformDataContract-> UniqueID = Marshal :: PtrToStringAnsi（（IntPtr）（char *）UniqueID）;
请告诉我您对此的建议/想法。
谢谢，
Sudhakar
Hi All ,
I need to convert a char array, char UniqueID[88] to a const char*
actually there is a data contract type string, UniqueID in C#.
and I have a extern char UniqueID[LEN] in another file that i can access in my cpp file
and we need to pass it from managed C++ to C#.
so I am trying to do as follows. but not able to succeed.
DataContracts::InformDataContract^ InformDataContract=gcnew DataContracts::InformDataContract();
InformDataContract->UniqueID= Marshal::PtrToStringAnsi((IntPtr) (char *)UniqueID );
Please let me know your suggestions /ideas on this.
Thanks,
Sudhakar
推荐答案
你只需要插入const限定符：
InformDataContract-> UniqueID = Marshal :: PtrToStringAnsi（（IntPtr）（const char *）UniqueID）;
确保您不仅指向C ++中的字符串，而且还拥有C ++中的缓冲区。
你需要在C＃端创建一个自己的副本，因为它是C ++环境的只读内存。
you only need to insert the const qualifier:
InformDataContract->UniqueID= Marshal::PtrToStringAnsi((IntPtr) (const char *)UniqueID );
Ensure that you not only pointing to the string in C++ but owning the buffer in your C++.
And you need to make a own copy on the C# side, because it is read only memory of the C++ environment.
大家好，
我能够解决我的问题。我的问题与从一个dll到另一个dll访问外部变量
有关。虽然我在Managed C ++标头中包含本机C ++标头，但它不接受。因此，我通过在其他适当的本机C ++文件中添加本机头文件并使其正常工作来解决这个问题。
感谢您的支持和帮助。 />
Sudhakar M
Hi All ,
I am able to resolve my problem. My problem is related to accessing a external variable
from one dll to another.while I am including native C++ headers in Managed C++ headers , it is not accepting. Hence I resolved this by addding the native header file in some other appropriate native C++ file and make it work as I need.
Thanks for your support and Help.
Sudhakar M
Sudhakar;
我知道你修复了你的链接问题。这是对类型转换的另一种看法。
Sudhakar;
I know you fixed your link problem. Here's a different take on the typecast.
InformDataContract->UniqueID= Marshal::PtrToStringAnsi((IntPtr) (char *)UniqueID );
由于UniqueID被声明为一个简单的数组，例如。
Since UniqueID is declared as a simple array, eg.
char UniqueID[88];
你只需要一个类型转换，就像这样。
You only need one typecast, like so.
InformDataContract->UniqueID = Marshal::PtrToStringAnsi((IntPtr)UniqueID );
如果UniqueID是一个CString，你想把它强制转换为
If UniqueID was a CString, you'd want to typecast it to
const char *首先，但不是必须进行额外的类型转换。
first, but it's not so the extra typecast is unnecessary.
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