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.NET Forum / Languages / Managed C++ / August 2007Routines in mixed (managed and native) assemblies
Hi all, I have an unmanaged DLL. The entry points in the DLL are declared via a .def file (which is syntactically easier for me to deal with than the arcane #pragma gibberish). Now I want some of the functions in this DLL to interact with a managed DLL. For performance reasons, I need to be absolutely certain where the transitions are between unmanaged and managed code and vice versa. I've stared long and hard at the MSDN documentation, but I haven't found a clear description of this, so I figured I'd ask in this NG. From what I've read, it looks like all I need to do is: 1. Add the /clr option to my project (Property Pages->Configuration Properties->General, "Common Language Runtime Support" field) 2. Include "#using <mscorlib.dll>" after the precompiled header directive in any files that contain functions that want to call into managed code. I believe (but I'm not certain) that *only* these files will be compiled as managed code (unless I fiddle with #pragma managed/unmanaged). Further, if I include the name of a function defined in one of these files in the .def file, an unmanaged entry point will be exported from the DLL. When that entry point is called, the unmanaged caller will magically call into the managed code. 3. I also need to make sure managed and unmanaged code use different precompiled header files, or disable precompiled headers alltogether. Is this all correct? Hi Bob, 1. Instead of adding it to the entire project, add /clr only on those files that contain functions that need to be managed. Put another way, you should decide which functions need to be managed and ensure that only those are built /clr. 2. No, any file compiled /clr will be managed, regardless of whether it contains #using<mscorlib.dll>. You should avoid #pragma managed/unmanaged. Your understanding of DLL exports is correct, with the caveat that __clrcall functions (including functions containing managed types in the signature) cannot be exported. 3. Yes. It's preferable to have them use different precompiled headers, since it will improve build speed. Actually, I was a bit confused with the "#pragma managed/unmanaged". Then, by discussing with VC++ team, I was told that we may run into many situations where these pragmas caused unexpected interactions with templates and compiler generated functions. The primary use for these pragmas, we found, was to control managed/native pathways to fix loader lock problems. However, it turns out that separating code into /clr and native compilands does the job a lot better. Hope it helps. Best regards, Jeffrey Tan Microsoft Online Community Support ================================================== Get notification to my posts through email? Please refer to http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif ications. Note: The MSDN Managed Newsgroup support offering is for non-urgent issues where an initial response from the community or a Microsoft Support Engineer within 1 business day is acceptable. Please note that each follow up response may take approximately 2 business days as the support professional working with you may need further investigation to reach the most efficient resolution. The offering is not appropriate for situations that require urgent, real-time or phone-based interactions or complex project analysis and dump analysis issues. Issues of this nature are best handled working with a dedicated Microsoft Support Engineer by contacting Microsoft Customer Support Services (CSS) at http://msdn.microsoft.com/subscriptions/support/default.aspx. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights. Thanks Jeffrey, that helps a lot! - Bob > Hi Bob, > [quoted text clipped - 46 lines] > This posting is provided "AS IS" with no warranties, and confers no > rights. You are welcome. If you need further help, please feel free to post, thanks. Best regards, Jeffrey Tan Microsoft Online Community Support ================================================== Get notification to my posts through email? Please refer to http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif ications. Note: The MSDN Managed Newsgroup support offering is for non-urgent issues where an initial response from the community or a Microsoft Support Engineer within 1 business day is acceptable. Please note that each follow up response may take approximately 2 business days as the support professional working with you may need further investigation to reach the most efficient resolution. The offering is not appropriate for situations that require urgent, real-time or phone-based interactions or complex project analysis and dump analysis issues. Issues of this nature are best handled working with a dedicated Microsoft Support Engineer by contacting Microsoft Customer Support Services (CSS) at http://msdn.microsoft.com/subscriptions/support/default.aspx. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights.
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