PDF to Image Golang Reference

class PdfToImageClient

All setter methods return PdfToImageClient object unless specified otherwise.

Constructor

func NewPdfToImageClient(userName string, apiKey string) PdfToImageClient
Constructor for the Pdfcrowd API client.
userName
Your username at Pdfcrowd.
apiKey
Your API key.

Conversion Input

func (client *PdfToImageClient) ConvertUrl(url string) ([]byte, error)
Convert an image.
url
The address of the image to convert.
The supported protocols are http:// and https://.
Returns
  • []byte - Byte array containing the conversion output. 
func (client *PdfToImageClient) ConvertUrlToStream(url string, outStream io.Writer) error
Convert an image and write the result to an output stream.
url
The address of the image to convert.
The supported protocols are http:// and https://.
outStream
The output stream that will contain the conversion output. 
func (client *PdfToImageClient) ConvertUrlToFile(url string, filePath string) error
Convert an image and write the result to a local file.
url
The address of the image to convert.
The supported protocols are http:// and https://.
filePath
The output file path. 
func (client *PdfToImageClient) ConvertFile(file string) ([]byte, error)
Convert a local file.
file
The path to a local file to convert.
The file must exist and not be empty.
Returns
  • []byte - Byte array containing the conversion output. 
func (client *PdfToImageClient) ConvertFileToStream(file string, outStream io.Writer) error
Convert a local file and write the result to an output stream.
file
The path to a local file to convert.
The file must exist and not be empty.
outStream
The output stream that will contain the conversion output. 
func (client *PdfToImageClient) ConvertFileToFile(file string, filePath string) error
Convert a local file and write the result to a local file.
file
The path to a local file to convert.
The file must exist and not be empty.
filePath
The output file path. 
func (client *PdfToImageClient) ConvertRawData(data []byte) ([]byte, error)
Convert raw data.
data
The raw content to be converted.
Returns
  • []byte - Byte array with the output. 
func (client *PdfToImageClient) ConvertRawDataToStream(data []byte, outStream io.Writer) error
Convert raw data and write the result to an output stream.
data
The raw content to be converted.
outStream
The output stream that will contain the conversion output. 
func (client *PdfToImageClient) ConvertRawDataToFile(data []byte, filePath string) error
Convert raw data to a file.
data
The raw content to be converted.
filePath
The output file path. 
func (client *PdfToImageClient) ConvertStream(inStream io.Reader) ([]byte, error)
Convert the contents of an input stream.
inStream
The input stream with source data.
Returns
  • []byte - Byte array containing the conversion output. 
func (client *PdfToImageClient) ConvertStreamToStream(inStream io.Reader, outStream io.Writer) error
Convert the contents of an input stream and write the result to an output stream.
inStream
The input stream with source data.
outStream
The output stream that will contain the conversion output. 
func (client *PdfToImageClient) ConvertStreamToFile(inStream io.Reader, filePath string) error
Convert the contents of an input stream and write the result to a local file.
inStream
The input stream with source data.
filePath
The output file path.

Conversion Format

func (client *PdfToImageClient) SetOutputFormat(outputFormat string) *PdfToImageClient
The format of the output file.
outputFormat
Allowed values:
  • png
  • jpg
  • gif
  • tiff
  • bmp
  • ico
  • ppm
  • pgm
  • pbm
  • pnm
  • psb
  • pct
  • ras
  • tga
  • sgi
  • sun
  • webp
Default: png

General Options

func (client *PdfToImageClient) SetPdfPassword(password string) *PdfToImageClient
Password to open the encrypted PDF file.
password
The input PDF password. 
func (client *PdfToImageClient) SetPrintPageRange(pages string) *PdfToImageClient
Set the page range to print.
pages
A comma separated list of page numbers or ranges.
Examples:
  • Just the second page is printed.
    SetPrintPageRange("2")
  • The first and the third page are printed.
    SetPrintPageRange("1,3")
  • Everything except the first page is printed.
    SetPrintPageRange("2-")
  • Just first 3 pages are printed.
    SetPrintPageRange("-3")
  • Pages 3, 6, 7, 8 and 9 are printed.
    SetPrintPageRange("3,6-9") 
func (client *PdfToImageClient) SetDpi(dpi int) *PdfToImageClient
Set the output graphics DPI.
Availability: API client >= 5.16.0, converter >= 20.10. See versioning.
dpi
The DPI value.
Default: 144 
func (client *PdfToImageClient) IsZippedOutput() bool
A helper method to determine if the output file from a conversion process is a zip archive. The conversion output can be either a single image file or a zip file containing one or more image files. This method should be called after the conversion has been successfully completed.
Returns
  • bool - True if the conversion output is a zip archive, otherwise False. 
func (client *PdfToImageClient) SetForceZip(value bool) *PdfToImageClient
Enforces the zip output format.
value
Set to true to get the output as a zip archive.
Default: false 
func (client *PdfToImageClient) SetUseCropbox(value bool) *PdfToImageClient
Use the crop box rather than media box.
value
Set to true to use crop box.
Default: false 
func (client *PdfToImageClient) SetCropAreaX(x int) *PdfToImageClient
Set the top left X coordinate of the crop area in points.
x
Must be a positive integer number or 0.
Default: 0
Example:
  • SetCropAreaX(100) 
func (client *PdfToImageClient) SetCropAreaY(y int) *PdfToImageClient
Set the top left Y coordinate of the crop area in points.
y
Must be a positive integer number or 0.
Default: 0
Example:
  • SetCropAreaY(100) 
func (client *PdfToImageClient) SetCropAreaWidth(width int) *PdfToImageClient
Set the width of the crop area in points.
width
Must be a positive integer number or 0.
Default: PDF page width.
Example:
  • SetCropAreaWidth(100) 
func (client *PdfToImageClient) SetCropAreaHeight(height int) *PdfToImageClient
Set the height of the crop area in points.
height
Must be a positive integer number or 0.
Default: PDF page height.
Example:
  • SetCropAreaHeight(100) 
func (client *PdfToImageClient) SetCropArea(x int, y int, width int, height int) *PdfToImageClient
Set the crop area. It allows to extract just a part of a PDF page.
x
Set the top left X coordinate of the crop area in points.
Must be a positive integer number or 0.
Default: 0
y
Set the top left Y coordinate of the crop area in points.
Must be a positive integer number or 0.
Default: 0
width
Set the width of the crop area in points.
Must be a positive integer number or 0.
Default: PDF page width.
height
Set the height of the crop area in points.
Must be a positive integer number or 0.
Default: PDF page height. 
func (client *PdfToImageClient) SetUseGrayscale(value bool) *PdfToImageClient
Generate a grayscale image.
value
Set to true to generate a grayscale image.
Default: false

Miscellaneous

func (client *PdfToImageClient) SetDebugLog(value bool) *PdfToImageClient
Turn on the debug logging. Details about the conversion are stored in the debug log. The URL of the log can be obtained from the getDebugLogUrl method or available in conversion statistics.
value
Set to true to enable the debug logging.
Default: false 
func (client *PdfToImageClient) GetDebugLogUrl() string
Get the URL of the debug log for the last conversion.
Returns
  • string - The link to the debug log. 
func (client *PdfToImageClient) GetRemainingCreditCount() int
Get the number of conversion credits available in your account.
This method can only be called after a call to one of the convertXtoY methods.
The returned value can differ from the actual count if you run parallel conversions.
The special value 999999 is returned if the information is not available.
Returns
  • int - The number of credits. 
func (client *PdfToImageClient) GetConsumedCreditCount() int
Get the number of credits consumed by the last conversion.
Returns
  • int - The number of credits. 
func (client *PdfToImageClient) GetJobId() string
Get the job id.
Returns
  • string - The unique job identifier. 
func (client *PdfToImageClient) GetPageCount() int
Get the number of pages in the output document.
Returns
  • int - The page count. 
func (client *PdfToImageClient) GetOutputSize() int
Get the size of the output in bytes.
Returns
  • int - The count of bytes. 
func (client *PdfToImageClient) GetVersion() string
Get the version details.
Returns
  • string - API version, converter version, and client version. 
func (client *PdfToImageClient) SetTag(tag string) *PdfToImageClient
Tag the conversion with a custom value. The tag is used in conversion statistics. A value longer than 32 characters is cut off.
tag
A string with the custom tag.
Example:
  • SetTag("client-1234") 
func (client *PdfToImageClient) SetHttpProxy(proxy string) *PdfToImageClient
A proxy server used by Pdfcrowd conversion process for accessing the source URLs with HTTP scheme. It can help to circumvent regional restrictions or provide limited access to your intranet.
proxy
The value must have format DOMAIN_OR_IP_ADDRESS:PORT.
Examples:
  • SetHttpProxy("myproxy.com:8080")
  • SetHttpProxy("113.25.84.10:33333") 
func (client *PdfToImageClient) SetHttpsProxy(proxy string) *PdfToImageClient
A proxy server used by Pdfcrowd conversion process for accessing the source URLs with HTTPS scheme. It can help to circumvent regional restrictions or provide limited access to your intranet.
proxy
The value must have format DOMAIN_OR_IP_ADDRESS:PORT.
Examples:
  • SetHttpsProxy("myproxy.com:443")
  • SetHttpsProxy("113.25.84.10:44333")

API Client Options

func (client *PdfToImageClient) SetUseHttp(value bool) *PdfToImageClient
Specifies if the client communicates over HTTP or HTTPS with Pdfcrowd API.
value
Set to true to use HTTP.
Default: false

Warning

Using HTTP is insecure as data sent over HTTP is not encrypted. Enable this option only if you know what you are doing.

func (client *PdfToImageClient) SetUserAgent(agent string) *PdfToImageClient
Set a custom user agent HTTP header. It can be useful if you are behind a proxy or a firewall.
agent
The user agent string.
Default: pdfcrowd_go_client/6.0.1 (https://pdfcrowd.com) 
func (client *PdfToImageClient) SetProxy(host string, port int, userName string, password string) *PdfToImageClient
Specifies an HTTP proxy that the API client library will use to connect to the internet.
host
The proxy hostname.
port
The proxy port.
userName
The username.
password
The password. 
func (client *PdfToImageClient) SetRetryCount(count int) *PdfToImageClient
Specifies the number of automatic retries when the 502 or 503 HTTP status code is received. The status code indicates a temporary network issue. This feature can be disabled by setting to 0.
count
Number of retries.
Default: 1
Example:
  • SetRetryCount(3)