![]() It’s always good and secure practice to check if the library functions returned successfully. We modified code around opendir and closedir function calls to check for errors and output the corresponding message for debugging. Thus, we implemented a simple while loop that prints every entry in the opened directory stream. When the end of the directory stream is reached, readdir returns NULL. ![]() Each call to readdir function returns a pointer to dirent structure representing the next directory entry. Once the directory stream is open and we retrieved the valid DIR*, we can read each entry in it using the readdir function. Use the readdir Function to Iterate Over Directory Entries In the following example code, we take the directory name from the first command-line argument and pass the value to the opendir function. DIR data type is implemented to represent directory stream, but the user should not allocate objects of the DIR type. opendir returns DIR* structure or NULL if an error is encountered. ![]() The function takes a single char pointer argument to specify the directory name to open. The opendir function is part of the POSIX specification and is defined in header file. Use the opendir Function to Open a Directory Stream This article will explain several methods of how to use the opendir function in C. Use the readdir Function to Iterate Over Directory Entries.Use the opendir Function to Open a Directory Stream.
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