[英]How to get the number of pages in Google Docs via Google script?
What should I do to get amount of pages in Google Docs (when converted to PDF) via Google script?我应该怎么做才能通过 Google 脚本获取 Google Docs 中的页面数量(转换为 PDF 时)?
I have tried this, but it returns 0 instead of the number of pages.我试过这个,但它返回 0 而不是页数。
function getNumPages()
{
var blob = DocumentApp.getActiveDocument().getAs("application/pdf");
var data = blob.getDataAsString();
var re = /Pages\/Count (\d+)/g;
var match;
var pages = 0;
while(match = re.exec(data)) {
Logger.log("MATCH = " + match[1]);
var value = parseInt(match[1]);
if (value > pages) {
pages = value;
}
}
Logger.log("pages = " + pages);
return pages;
}
Your regular expression expects a string like Pages/Count 3
in the PDF file. 您的正则表达式需要PDF文件中的
Pages/Count 3
等字符串。 Logging the contents of the file with Logger.log(data)
shows there isn't such a string. 使用
Logger.log(data)
记录文件的内容显示没有这样的字符串。 Instead, I find the number of pages near the beginning of the file: 相反,我发现文件开头附近的页数:
<< /Linearized 1 /L 18937 /H [ 687 137 ] /O 10 /E 17395 /N 3 /T 18641 >>
The number following /N is the number of pages. 后面的数字/ N是页数。 Here is a function extracting it:
这是一个提取它的函数:
function getNumPages() {
var blob = DocumentApp.getActiveDocument().getAs("application/pdf");
var data = blob.getDataAsString();
var pages = parseInt(data.match(/ \/N (\d+) /)[1], 10);
Logger.log("pages = " + pages);
return pages;
}
function getNumPages(docId) {
var pages = 0;
var blob = DocumentApp.openById(docId).getAs("application/pdf");
var data = blob.getDataAsString();
try {
var matched = data.match(/\/Type[\s]*\/Page[^s]/g);
pages = matched.length;
} catch(err) {
// NOOP
}
return pages;
}
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