# fpCreateThumbnailForFile()

This functions converts a source file to an output PNG thumbnail file.

## Syntax

    KVPDFState pascal fpCreateThumbnailForFile(
       const KVPDFContext context,
       const char* const pszInFileName,
       const char* const pszOutFileName,
       const unsigned int widthPixels,
       const unsigned int heightPixels,
       const KVPDFThumbnailOptions options)

## Arguments

`Context` | A context value obtained by using fpInit().
`pszInFileName` | A null-terminated C string that contains the path of the file to export to PNG.
`pszOutFileName` | A null-terminated C string that contains the full file path where the export process must create the PNG. This value cannot be the current working directory.
`widthPixels` | The width of the output bounding box in pixels.
`heightPixels` | The height of the output bounding box in pixels.
`options` | A KVPDFThumbnailOptions structure. Initialize a KVPDFThumbnailOptions structure with the `KVStructInit()` macro, and then modify the structure as necessary.

## Returns

- If the call is successful, a `KVPDFState` structure with `eErrorCode` set to `KVERR_Success`.
- If the call is unsuccessful, a `KVPDFState` structure that indicates the reason for the error.

## Discussion

- You cannot create PNG files in the current working directory.

- If the target PNG file exists, this function overwrites it if possible.

- On Windows systems, specify the paths in the local Windows code page.

- You must initialize the options structure by using the `KVStructInit()` macro.

- The output thumbnail is created to fit in the bounding box that you specify with `widthPixels` and `heightPixels`, but it maintains the correct aspect ratio.

- Usage of this function is licensed separately.

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