This happens when calling .InnerText when a page happ

@ jerzybrzoska , checking your variable <c

invalid memory address or nil pointer dereference about xpath HOT 2 OPEN

antchfx commented on June 1, 2024 1

invalid memory address or nil pointer dereference

from xpath.

Comments (2)

jerzybrzoska commented on June 1, 2024

When calling this function with fmt.Println(getSnatch49xp())

func getSnatch49xp() string {
  var title string

  doc, err := htmlquery.LoadURL("https://en.wikipedia.org/wiki/List_of_Olympic_records_in_weightlifting")
  if err != nil {
      log.Fatal(err)
  }
    xp1 := "div[@id='mw-content-text']/div[1]/table[1]/tbody/tr[3]/td[2]"
    td := htmlquery.FindOne(doc, xp1)
    record = htmlquery.InnerText(td)
    
  return record
}

I get something similar that the OP brought up:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x67277c]

goroutine 1 [running]:
github.com/antchfx/htmlquery.InnerText.func1(0xc000410220?, 0xc000465830?)
	/home/jim/go/pkg/mod/github.com/antchfx/[email protected]/query.go:143 +0x1c
github.com/antchfx/htmlquery.InnerText(0x6fa3e3?)
	/home/jim/go/pkg/mod/github.com/antchfx/[email protected]/query.go:156 +0x6c
main.getSnatch49xp()
	/home/jim/CS/SoftwareDevelopment/MySoftware/Go/weightlifting-records/main.go:47 +0x7c
main.main()
	/home/jim/CS/SoftwareDevelopment/MySoftware/Go/weightlifting-records/main.go:57 +0x19

from xpath.

zhengchun commented on June 1, 2024

@jerzybrzoska, checking your variable td is not nil before calling htmlquery.InnerText(td), like this if td != nil { record = htmlquery.InnerText(td) }

your xpath express is not good, change it to //div[@id='mw-content-text']/div[1]/table[1]/tbody/tr[3]/td[2] . div[@id='mw-content-text']/div[1]/table[1]/tbody/tr[3]/td[2] will not found any matching nodes.

from xpath.

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