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a question about C++.net class library

a question about C++.net class library# DotNet - 窗口里的风景

w*w2003-11-05 08:11

1 楼

in .NET, i defined a function in C++ class library for file open
int open(char* filename) {blah...}
Now i want to use it in C#, add reference from this DLL. C# asks:
open(sbyte*)
how to use this function in C#, where to convert a string to sbyte* ?
thanks.

y*t2003-11-05 08:11

2 楼

it is not safe code, i think.

【在 w**w 的大作中提到】

: in .NET, i defined a function in C++ class library for file open
: int open(char* filename) {blah...}
: Now i want to use it in C#, add reference from this DLL. C# asks:
: open(sbyte*)
: how to use this function in C#, where to convert a string to sbyte* ?
: thanks.

w*w2003-11-05 08:11

3 楼

the problem is how to convert it. it is impossible for everyone to rewrite the
previous code, i suppose .NET should be able to handle it.

【在 y****t 的大作中提到】

: it is not safe code, i think.

s*i2003-11-05 08:11

4 楼

try this:
//in C#, make a sbyte array, say
//sbyte[] sArray = .....
unsafe
{
fixed(byte *fileName=sArray) className.open(fileName);
}
This should work. Remember to enable 'unsafe blocks" in Visual Studio to
compile correctly.
Working with sbyte is actually not very convinient. If you can recompile your
C++ with "/J" (default char unsigned: Yes), your expected input becomes
"byte*" instead of "sbyte*". This way, you can try this:
//using System.Text
.....
ASCIIEncoding encoding=new ASCIIEncod

【在 w**w 的大作中提到】

w*w2003-11-05 08:11

5 楼

thanks a lot!! The second method works. I had troubles to convert sbyte, so i
didn't try first one, but it looks fine as well.

【在 s*i 的大作中提到】

: try this:
: //in C#, make a sbyte array, say
: //sbyte[] sArray = .....
: unsafe
: {
: fixed(byte *fileName=sArray) className.open(fileName);
: }
: This should work. Remember to enable 'unsafe blocks" in Visual Studio to
: compile correctly.
: Working with sbyte is actually not very convinient. If you can recompile your