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.NET Forum / Languages / Managed C++ / October 2007Errors in VC.Net porting
Hi all, I am porting an code written in VC++ to VC.Net to make it manage. But in Managed VC we dont use "const" keyboard at all. but my code is using it very frequently, so is their any alternative to it or we have to remove the "const" keyword from our code completely. Please suggest me the solution. Secondly i am getting one error as:: error C4439: 'function_name' : function definition with a managed type in the signature must have a __clrcall calling convention. code is::extern "C" __declspec(dllexport) String* APIENTRY function_name( String* s). Please help me out from these errors. Thanks. >I am porting an code written in VC++ to VC.Net to make it manage. But in >Managed VC we dont use "const" keyboard at all. but my code is using it very >frequently, so is their any alternative to it or we have to remove the >"const" keyword from our code completely. You should still be able to use const in those parts of your code that are still native C++, but as you've found, there's not the same notion of const in the managed world. BTW, you mention managed VC - if that means versions prior to VS2005, you might be wise to move to VS2005 and use the much neater C++/CLI. Dave Thanks David for this suggestion. but you have not answered my second question :: i am getting this error :: error C4439: 'function_name' : function definition with a managed type in the signature must have a __clrcall calling convention. my code is::extern "C" __declspec(dllexport) String* APIENTRY function_name( String* s). Please help me out from these errors. > >I am porting an code written in VC++ to VC.Net to make it manage. But in > >Managed VC we dont use "const" keyboard at all. but my code is using it very [quoted text clipped - 9 lines] > > Dave >error C4439: 'function_name' : function definition with a managed type in >the signature must have a __clrcall calling convention. > >my code is::extern "C" __declspec(dllexport) String* APIENTRY function_name( >String* s). >Please help me out from these errors. Presumably you need to specify __clrcall. Have you tried adding it ? Dave > Thanks David for this suggestion. but you have not answered my second > question :: i am getting this error :: [quoted text clipped - 4 lines] > String* s). > Please help me out from these errors. Dipesh: I am not an expert on managed code, but I am sure extern "C" is not allowed on a function with managed types in the signature. It would appear you are trying to convert your entire application to use managed types. If you want to do this you might as well rewrite the whole application in C#. The big advantage of Managed C++ (or C++/CLI) is that you can easily mix managed and unmanaged code in your application, and you do not seem to be taking advantage of this. IMHO, you should also take serious note of David Lowndes' suggestion to move to VS2005. You can also use the latest beta version of VS2008 (which is free). Managed C++ as used in Vs2002 and VS2003 is obsolete, and IMHO it would be a huge mistake to migrate existing unmanaged code to it.  SignatureDavid Wilkinson Visual C++ MVP HI david yes you were right that i am porting my code written in VC++ to make it managed. I am working on VS2005, and i a not able to remove the error c4439 of __clrcall. Please help me by providing the exact syntax of exporting the previously written functions in VC++ to export them in VC.Net. My code is like::extern "C" __declspec(dllexport) String* APIENTRY function_name( String* s). And how should i mix both native & managed code in a single project?? Thanks. > > Thanks David for this suggestion. but you have not answered my second > > question :: i am getting this error :: [quoted text clipped - 21 lines] > and IMHO it would be a huge mistake to migrate existing unmanaged code > to it. > HI david yes you were right that i am porting my code written in VC++ to make > it managed. I am working on VS2005, and i a not able to remove the error [quoted text clipped - 3 lines] > function_name( String* s). And how should i mix both native & managed code in > a single project?? Dipesh: Maybe I am not clear what you are doing. What is String? If it is managed and you are using VS2005, then you should be using String^, not String*. But my point was that in C++/CLI you do not need to convert each and every function to managed. To mix managed and unmanaged code you just do it (that's why it's called IJW - It Just Works), though there are things you cannot do. I am no expert here, but I think managed code can generally call unmanaged code, but not vice-versa. A good introductory book on C++/CLI is Ivor Horton's "Beginning C++ 2005." SignatureDavid Wilkinson Visual C++ MVP Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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