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Vlas Karpov
Vlas Karpov

Convert Dll To C Code Online


Half year ago I reinstalled operation system and unfortunately deleted source code which I converted to dll, and now I have only dll file and don't know how to convert it to source code, I tried to use reflector but it didn't help? Can anyone help me please?




Convert Dll To C Code Online



What you want to do is like separating the ingredients of a backed cake. You can separate some components, but not in the original quality. The DLL is not your source code - it's a product of your source code. Like the cake. Sorry.


This step-by-step walkthrough shows how to use the Visual Studio IDE to create your own dynamic link library (DLL) written in Microsoft C++ (MSVC). Then it shows how to use the DLL from another C++ app. DLLs (also known as shared libraries in UNIX-based operating systems) are one of the most useful kinds of Windows components. You can use them as a way to share code and resources, and to shrink the size of your apps. DLLs can even make it easier to service and extend your apps.


This walkthrough doesn't cover some common situations. The code doesn't show the use of C++ DLLs by other programming languages. It doesn't show how to create a resource-only DLL, or how to use explicit linking to load DLLs at run-time rather than at load-time. Rest assured, you can use MSVC and Visual Studio to do all these things.


Even though the code of the DLL is written in C++, we've used C-style interfaces for the exported functions. There are two main reasons for this: First, many other languages support imports of C-style functions. The client app doesn't have to be written in C++. Second, it avoids some common pitfalls related to exported classes and member functions. It's easy to make hard-to-diagnose errors when exporting classes, since everything referred to within a class declaration has to have an instantiation that's also exported. This restriction applies to DLLs, but not static libraries. If your classes are plain-old-data style, you shouldn't run into this issue.


This walkthrough assumes you're using Visual Studio 2017 version 15.9 or later. Some earlier versions of Visual Studio 2017 had defects in the code templates, or used different user interface dialogs. To avoid problems, use the Visual Studio Installer to update Visual Studio 2017 to version 15.9 or later.


In this set of tasks, you create a project for your DLL, add code, and build it. To begin, start the Visual Studio IDE, and sign in if you need to. The instructions vary slightly depending on which version of Visual Studio you're using. Make sure you have the correct version selected in the control in the upper left of this page.


When you create a DLL, think about how client apps may use it. To call the functions or access the data exported by a DLL, client source code must have the declarations available at compile time. At link time, the linker requires information to resolve the function calls or data accesses. A DLL supplies this information in an import library, a file that contains information about how to find the functions and data, instead of the actual code. And at run time, the DLL must be available to the client, in a location that the operating system can find.


To avoid out-of-sync code, we recommend you set the include path in your client project to include the DLL header files directly from your DLL project. Also, set the library path in your client project to include the DLL import libraries from the DLL project. And finally, copy the built DLL from the DLL project into your client build output directory. This step allows your client app to use the same DLL code you build.


Next, to call the MathLibrary functions in your source code, your project must include the MathLibrary.h file. You could copy this header file into your client app project, then add it to the project as an existing item. This method can be a good choice for third-party libraries. However, if you're working on the code for your DLL and your client at the same time, the header files could get out of sync. To avoid this issue, set the Additional Include Directories path in your project to include the path to the original header.


This code can be compiled, but not linked. If you build the client app now, the error list shows several LNK2019 errors. That's because your project is missing some information: You haven't specified that your project has a dependency on the MathLibrary.lib library yet. And, you haven't told the linker how to find the MathLibrary.lib file.


Now that you've created a DLL and a client application, you can experiment. Try setting breakpoints in the code of the client app, and run the app in the debugger. See what happens when you step into a library call. Add other functions to the library, or write another client app that uses your DLL.


At times, it is necessary to use native (non-Java) codes (e.g., C/C++) to overcome the memory management and performance constraints in Java. Java supports native codes via the Java Native Interface (JNI).


The native functions receives argument in the above JNI types and returns a value in the JNI type (such as jstring, jintArray). However, native functions operate on their own native types (such as C-string, C's int[]). Hence, there is a need to convert (or transform) between JNI types and the native types.


Passing strings is more complicated than passing primitives, as Java's String is an object (reference type), while C-string is a NULL-terminated char array. You need to convert between Java String (represented as JNI jstring) and C-string (char*).


JNI supports conversion for Unicode (16-bit characters) and UTF-8 (encoded in 1-3 bytes) strings. UTF-8 strings act like null-terminated C-strings (char array), which should be used in C/C++ programs.


The 3rd parameter isCopy (of jboolean*), which is an "in-out" parameter, will be set to JNI_TRUE if the returned string is a copy of the original java.lang.String instance. It will be set to JNI_FALSE if the returned string is a direct pointer to the original String instance - in this case, the native code shall not modify the contents of the returned string. The JNI runtime will try to return a direct pointer, if possible; otherwise, it returns a copy. Nonetheless, we seldom interested in modifying the underlying string, and often pass a NULL pointer.


Again, you need to convert between JNI array and native array, e.g., between jintArray and C's jint[], or jdoubleArray and C's jdouble[]. The JNI Environment interface provides a set of functions for the conversion:


codegen options function -args func_inputs generates C or C++ code from a MATLAB function with inputs of type func_inputs and builds the generated code. Use the options argument to specify settings such as the code generation configuration object. The configuration object controls build type (MEX, lib, dll, or exe) and code generation parameters. For information on creating and using a configuration object, see Configure Build Settings, coder.config, and the configuration object reference pages: coder.CodeConfig, coder.MexCodeConfig, and coder.EmbeddedCodeConfig.


codegen options files function -args func_inputs generates C/C++ code from a MATLAB function that uses custom source code specified in external files. For more information, see Call Custom C/C++ Code from the Generated Code and Configure Build for External C/C++ Code.


codegen options files function -args func_inputs -nargout number_args generates C/C++ code and controls the number of output arguments for the C/C++ function code generated from the MATLAB function. The files and options arguments are optional. Use the -nargout option when not all of the MATLAB function outputs are needed. For more information, see Specify Number of Entry-Point Function Input or Output Arguments to Generate.


codegen options files function1 -args func1_inputs ... functionN -args funcN_inputs generates C/C++ code from multiple MATLAB functions. Write the input arguments separately for each function following the function name. You can also use the -nargout option for each function. The functions that you generate code from are called entry-point functions. For more information, see Generate Code for Multiple Entry-Point Functions.


codegen options files function -args func_inputs1 ... -args func_inputsN generates multisignature MEX function from a MATLAB function. Provide multiple -args specifications for input arguments of the same entry-point function. Use the options argument to specify settings such as the code generation configuration object and parameters. You must specify the build type as MEX function. Other build types (lib, dll, and exe) are not supported. For more information, see Generate One MEX Function for Multiple Signatures.


To allow the generation of MEX or C/C++ code with specific types, you must specify the properties (class, size, and complexity) of all input variables to the MATLAB entry-point functions. In this example, you use the -args option to provide example values for the inputs. The code generator uses these example values to determine that the first input is a 1-by-4 array of real double values and the second input is a real scalar double.


The actual values of these example inputs are not relevant for code generation. Any other pair of values with the same properties (class, size, and complexity) results in the same generated code. See Specify Properties of Entry-Point Function Inputs.


At the command line, call the generated MEX function mcadd_mex. Make sure that the class, size, and complexity of the values that you pass to mcadd_mex match the input properties that you specified in the codegen command.


At the MATLAB command line, run this codegen command.codegen -config:mex myAdd.m -args 1,2 -args int8(2),int8(3) -args 1:10,1:10 -reportThe code generator creates a single MEX function myAdd_mex for the multiple signatures specified in the codegen command. For more information, see Generate One MEX Function for Multiple Signatures.


This example shows how to specify a main function as a parameter in the configuration object coder.CodeConfig. Alternatively, you can specify the file containing main() separately at the command line. You can use a source, object, or library file.


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