Where Does Visual Studio Search for Header Files?

Visual Studio's Header File Search Path

When attempting to compile a C application, Visual Studio may encounter difficulties locating specific header files. Understanding where Visual Studio searches for header files is crucial to resolving such issues.

Visual Studio employs a logical search order for header files:

1. Current Source Directory: The current directory where the source code resides is searched first.
2. Additional Include Directories: Project properties allow you to specify additional include directories. This can be found under "Project" -> "[project name] Properties" -> C/C -> General -> Additional Include Directories.
3. Visual Studio C Include Directories: By navigating to "Tools" -> "Options" -> "Projects and Solutions" -> "VC Directories," you can access the default include directories defined by Visual Studio.
4. Default Include Directories (Visual Studio 2015 ): In recent versions of Visual Studio, the previous option is deprecated. A list of default include directories can be found under "Project Properties" -> "Configuration" -> "VC Directories."

To address the problem you encountered, you should add the directory containing the missing header file to the "Additional Include Directories" option in your project properties. Navigate to "Project Properties" -> "Configuration" -> "C/C " -> "General" -> "Additional Include Directories" and add the appropriate directory.

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