DllImport incomplete names
I am using several P/Invokes under .NET. However, I want my library to work both in Windows and Linux, preferably with the same binaries.
Since the native library I depend on is available on multiple platforms, I was hoping to just have them along with my managed library's binaries.
Right now I'm using something like this:
[DllImport开发者_运维问答("/usr/lib/libMYLIBNAME.so.1")]
But this obviously only works for Linux. I was considering that I could possibly copy that binary from /usr/lib and distribute along with my application, so I could reduce the above to:
[DllImport("libMYLIBNAME.so")]
But this still is Linux-only.
Is there anyway to change the library name string so it'd look for libMYLIBNAME.so under Linux and MYLIBNAME.dll on Windows, or something very similar?
I would like to avoid anything that requires recompilation for each supported platform...
(Note: even better would be a solution that'd look for MYLIBNAME.dll on Windows and /usr/lib/libMYLIBNAME.so.1 on Linux, but this improvement is optional)
Two things
1- DllImport without the extension This is supported on Windows, Linux and MAC and will import the appropriate library for the target platform.
[DllImport("libMYLIBNAME")] -
2- The preffered option is to use the <dllmap/>
which allows you to map an import library name to the target platform library name. So if on Windows you have a dll called mylib.dll
and the corresponding Linux so is mylinuxlib.so.3.6.1
you can import this using the windows DLL name
[DllImport("mylib.dll")]
And add a configuration to the config to map this name to the Linux library name
<configuration>
<dllmap dll="mylib.dll" target="mylinuxlib.so.3.6.1" />
</configuration>
Read more Here
One solution I've seen is to create an abstract wrapper class around your P/Invokes and to generate the appropriate one based on environment.
public abstract class Wrapper
{
public void SomeMethod()
{
WrappedMethod();
}
public static Wrapper GetWrapper()
{
//TODO: write some method to determine OS
return IsLinux() ? new LinuxWrapper() : new WindowsWrapper();
}
public abstract void WrappedMethod();
}
public class WindowsWrapper : Wrapper
{
//windows dll imports go here
public override void WrappedMethod()
{
//p/invokes go here
}
}
public class LinuxWrapper : Wrapper
{
//linux dll imports go here
public override void WrappedMethod()
{
//p/invokes go here
}
}
Windows isn't picky about the filename extension for a DLL. Changing them isn't unusual, .ocx for ActiveX controls, .scr for screen savers for example. But still a regular DLL. The Windows loader verifies the identity of the file from the content, the PE32 header is what makes it a true DLL.
So just rename your Window version of the .dll to .so. Change the linker's Output name setting or just rename the file.
精彩评论