c++将一个pdf拆分成单页

要将一个PDF拆分成单页，可以使用C++中的PDF库，如Poppler或MuPDF。

下面是使用Poppler库将一个PDF拆分成单页的示例代码：

#include <poppler/cpp/poppler-document.h>
#include <poppler/cpp/poppler-page.h>
#include <iostream>
using namespace std;

int main(int argc, char *argv[]) {
    if (argc < 3) {
        cout << "Usage: " << argv[0] << " input.pdf output_prefix" << endl;
        return 1;
    }
    string input_pdf_path = argv[1];
    string output_prefix = argv[2];
    auto doc = poppler::document::load_from_file(input_pdf_path);
    if (!doc) {
        cout << "Failed to load PDF file: " << input_pdf_path << endl;
        return 1;
    }
    for (int i = 0; i < doc->pages(); i++) {
        auto page = doc->create_page(i);
        if (!page) {
            cout << "Failed to load page " << i << endl;
            continue;
        }
        string output_path = output_prefix + to_string(i) + ".pdf";
        auto writer = poppler::document::create_writer(output_path);
        if (!writer) {
            cout << "Failed to create writer for " << output_path << endl;
            continue;
        }
        writer->add_page(page);
        writer->write();
        cout << "Page " << i << " saved to " << output_path << endl;
    }
    return 0;
}

以上代码将输入PDF文件拆分成单独的PDF文件，每个文件名以指定的前缀加上页码编号。例如，如果前缀为“output_”，则第一页的文件名将为“output_0.pdf”。