How to Remove (Delete) Specific Pages from a PDF Document using C/C++

When it comes time to edit PDF files at scale, there’s a lot we can accomplish without ever opening an actual document on our device. Using the ready-to-run C/C++ code provided below, we can leverage an API that removes pages from a PDF file based on a page range (pageStart to pageEnd), accepting multipart/form-data input.

To take advantage of this solution, we’ll first need to install Libcurl in our project:

libcurl/7.75.0

After that, we can structure your API call using the below examples, and we can authorize our request with a free-tier API key (good for 800 API calls per month with no commitment):

CURL *curl;
CURLcode res;
curl = curl_easy_init();
if(curl) {
     curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
     curl_easy_setopt(curl, CURLOPT_URL, "https://api.cloudmersive.com/convert/edit/pdf/pages/delete");
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
     curl_easy_setopt(curl, CURLOPT_DEFAULT_PROTOCOL, "https");
     struct curl_slist *headers = NULL;
     headers = curl_slist_append(headers, "pageStart: <integer>");
     headers = curl_slist_append(headers, "pageEnd: <integer>");
     headers = curl_slist_append(headers, "Content-Type: multipart/form-data");
     headers = curl_slist_append(headers, "Apikey: YOUR-API-KEY-HERE");
     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
     curl_mime *mime;
     curl_mimepart *part;
     mime = curl_mime_init(curl);
     part = curl_mime_addpart(mime);
     curl_mime_name(part, "inputFile");
     curl_mime_filedata(part, "/path/to/file");
     curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
     res = curl_easy_perform(curl);
     curl_mime_free(mime);
}
curl_easy_cleanup(curl);

At this point we’re good to go — no more code required. It’s just that simple!