Conversion Error for CPDFConverter Instance

Error	Description
`CPDFConverterEncryptError`	Password required or incorrect password.
`CPDFConverterPermissionError`	The license doesn't allow the permission.
`CPDFConverterMallocError`	Malloc failure.
`CPDFConverterUnknownError`	Unknown error in processing conversion.
`CPDFConverterPDFUnknownError`	Unknown error in processing PDF.
`CPDFConverterPDFFileError`	File not found or could not be opened.
`CPDFConverterPDFFormatError`	File not in PDF format or corrupted.
`CPDFConverterPDFSecurtyError`	Unsupported security scheme.
`CPDFConverterPDFPageError`	Page not found or content error.

Get the corresponding error code when conversion fails:

- (void)converter:(CPDFConverter *)converter didEndConvert:(NSError *)error {
    if (error) {
        if (CPDFConverterEncryptError == error.code) {
            
        } else if (CPDFConverterPermissionError == error.code) {
            
        } else if (CPDFConverterMallocError == error.code) {
            
        } else if (CPDFConverterUnknownError == error.code) {
            
        } else if (CPDFConverterPDFUnknownError == error.code) {
            
        } else if (CPDFConverterPDFFileError == error.code) {
            
        } else if (CPDFConverterPDFFormatError == error.code) {
            
        } else if (CPDFConverterPDFSecurityError == error.code) {
            
        } else if (CPDFConverterPDFPageError == error.code) {
            
        }
    }
}