![]() The picture below is taken from the Detours help page and presents the difference between invoking the function without and with interception. The Detours library intercepts function calls at runtime, so we don’t need to replace the DLLs with the new ones, but we’re only modifying the memory of the process we would like to analyze. The detour function can either replace the target function or extend its semantics by invoking the target function as a subroutine through the target pointer to the trampoline. The address of the trampoline is placed in a target pointer. Instructions from the target function are placed in a trampoline. Detours replaces the first few instructions of the target function with an unconditional jump to the user-provided detour function. Interception code is applied dynamically at runtime. This help page provides the following information:ĭetours is most commonly used to intercept Win32 APIs calls within an application, such as to add debugging instrumentation. We should also be aware of the fact that the Detours directory contains a Detours Help HTML file that contains the basic howto guide for Detours. ![]() The project is now configured to be able to use Detours, but as we will later see, we will still need to copy some of the files to the project’s source directory. We should add a path to the C:Program FilesMicrosoft ResearchDetours Express 3.0include directory in there as can be seen in the picture below:Īdditionally, we also need to put the C:Program FilesMicrosoft ResearchDetours Express 3.0lib directory under the Properties – Configuration Properties – Linker into the Additional Library Directories. First we need to open Properties – Configuration Properties – C/C++ and properly configure the Additional Include Directories configuration variable. When creating a new project we need to access the Properties of each project and add paths to the Detours library. But we still need to tell the Visual Studio where to find Detours libraries when trying to use it in a project. When the nmake is done compiling, Detours is finally installed. In the same command prompt, we need to change the directory to the Detours directory C:Program FilesMicrosoft ResearchDetours Express 3.0 and run the nmake command to build the Detours libraries, tools and samples. After that we need to open the Visual Studio Command Prompt and execute vcvarsall.bat script. ![]()
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