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Learn how to easily `copy and paste` files in FreePascal without using Lazarus, and get your programs set up with the right functions!
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This video is based on the question https://stackoverflow.com/q/65016942/ asked by the user 'Darcy Power' ( https://stackoverflow.com/u/14711087/ ) and on the answer https://stackoverflow.com/a/65017458/ provided by the user 'Doj' ( https://stackoverflow.com/u/11695625/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Copy a File from One Location to Another in FreePascal

In the world of programming, file management is a crucial task that developers often need to perform. Whether it's duplicating configuration files, data files, or even whole executables, knowing how to copy files programmatically can save time and reduce errors. In this guide, we will explore how to copy a file from one location and paste it into another using FreePascal.

The Challenge: Copying Files Without Lazarus

A common scenario developers face is the need to copy their programs to specific locations, like the Windows startup folder. While the Lazarus environment provides a function called CopyFile() from the FileUtils library, not all users need or want to work with Lazarus. So, is there another way to achieve this in FreePascal? Absolutely!

The Solution: Using the File Type

To copy a file in FreePascal without depending on Lazarus, we can utilize the traditional File type along with some basic file handling routines. Below, I've outlined a simple yet effective function to accomplish this task.

Step-by-Step Explanation of the CopyFile Function

Here is the complete function to copy a file, followed by an explanation of each part:

[[See Video to Reveal this Text or Code Snippet]]

Breaking Down the Function

Function Definition:

CopyFile takes two parameters, SrcFileName and DstFileName, which are the names of the source and destination files, respectively. The function returns a Boolean indicating success or failure.

File Assignment:

We use Assign(Src, SrcFileName); to associate the source variable Src with the specified source file.

Opening the Source File:

The Reset(Src, 1); line opens the source file in read mode (1 denotes binary mode).

We check for errors with IOResult. If an error occurs, the function exits with False.

Opening the Destination File:

Similarly, we prepare the destination file with Rewrite(Dst, 1); to open it in write mode. If this fails, we close the source and exit with False.

Buffer Management:

A dynamic array Buf is created to buffer the file contents. Here it’s set to 64 MB for efficiency.

Copying Data:

A loop reads from the source file until the end is reached (Eof(Src)).

BlockRead reads chunks of data into the buffer.

BlockWrite then writes this data to the destination file.

Cleanup:

Finally, both files are closed regardless of success or failure, ensuring proper resource management.

Conclusion: A Simple yet Effective File Copying Method

Now you have a clear method to copy files using FreePascal without needing Lazarus. With the provided CopyFile function, you can easily duplicate files in your projects or set up your applications to move files to essential directories like the startup folder smoothly.

Feel free to play around with the code, adjust the buffer size, or utilize this function in your projects. Happy coding!