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# Obtain Image Info

When exporting from presentation graphics files, and when using the `pdf2sr` reader to export from PDF files, KeyView can obtain information about the number of images that it would create during export, without having to run a full export. This option uses function pointers that are part of the KVXMLInterfaceEx structure.

To extract image information

1. Initialize an image information session by calling the `fpGetOutputImageInfos()` function. You must pass the return value for this function to the other image functions.
2. Call the `fpGetOutputImageCount()` function to get the number of images identified.
3. (Optional) For each image, call `fpGetOutputImageInfo()` to obtain the image dimensions.
4. Free the internal resources associated with the image information session by calling `fpFreeImageInfos()`.

## Example

    int numberOfImages = 0;
    void* pImageInfoContext = (*KVXMLInt.fpGetOutputImageInfos)(pContext, &inputStream, &options);
    if (pImageInfoContext == NULL)
    {
       // Error handling code would go here.
       // fpGetKvErrorCode() could be called here to investigate.
    }
    (*KVXMLInt.fpGetOutputImageCount)(pImageInfoContext, &numberOfImages);
    for (int i = 0; i < numberOfImages; i++)
    {
       KVXMLImageInfo imageInfo;
       KVStructInit(&imageInfo);
       if ((*KVXMLInt.fpGetOutputImageInfo)(pImageInfoContext, i, &imageInfo))
       {
          // imageInfo.nWidth and imageInfo.nHeight
          // contain the dimensions at this point.
       }
    }
    (*KVXMLInt.fpFreeImageInfos)(pContext, pImageInfoContext);
    pImageInfoContext = NULL;

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