Aspose.PDF FOSS
C++
Use Cases

Use Cases

This guide demonstrates real-world use cases for Aspose.PDF FOSS for C++, including document generation, PDF-to-image conversion, text extraction, secure distribution, and AcroForm data collection. The library links against nothing but the C++ standard library and requires a C++20 compiler.

Document Generation

Build a PDF from scratch by adding pages to a new Document and saving the result. This pattern underlies invoice generation, certificate printing, and statement production pipelines:

#include <aspose/pdf/document.hpp>

int main() {
    Aspose::Pdf::Document doc;
    doc.Pages().Add();
    doc.SetTitle("Monthly Report");
    doc.Save("report.pdf");
}

PDF-to-Image Conversion

Render a page to a raster image for thumbnails, print-ready output, or visual regression baselines. PngDevice, JpegDevice, BmpDevice, and TiffDevice each process one page at a time at a given resolution:

#include <aspose/pdf/document.hpp>
#include <aspose/pdf/png_device.hpp>
#include <aspose/pdf/resolution.hpp>
#include <fstream>

int main() {
    Aspose::Pdf::Document doc("input.pdf");
    Aspose::Pdf::Devices::PngDevice png(Aspose::Pdf::Devices::Resolution(150));
    std::ofstream out("page1.png", std::ios::binary);
    png.Process(doc.Pages()[1], out);
}

Text Extraction and Indexing

Extract the full text of a document with TextAbsorber for search indexing, data-mining pipelines, or automated content verification in test suites:

#include <aspose/pdf/document.hpp>
#include <aspose/pdf/text_absorber.hpp>
#include <iostream>

int main() {
    Aspose::Pdf::Document doc("input.pdf");
    Aspose::Pdf::Text::TextAbsorber absorber;
    absorber.Visit(doc);
    std::cout << absorber.Text() << "\n";
}

Secure Document Distribution

Encrypt a document with separate user and owner passwords before distribution. The user password is required to open the file; the owner password governs permissions such as printing and content extraction:

#include <aspose/pdf/document.hpp>

int main() {
    Aspose::Pdf::Document doc("report.pdf");
    doc.Encrypt("user-password", "owner-password",
                Aspose::Pdf::Permissions(),
                Aspose::Pdf::CryptoAlgorithm::AESx256);
    doc.Save("report-secured.pdf");
}

AcroForm Data Collection

Read submitted values back from a filled PDF form by iterating Form.Fields() and printing each field’s name and current value — useful for processing filled application forms without a separate form-submission server:

#include <aspose/pdf/document.hpp>
#include <aspose/pdf/forms/form.hpp>
#include <iostream>

int main() {
    Aspose::Pdf::Document doc("submitted-form.pdf");
    auto& form = doc.Form();
    for (auto* field : form.Fields()) {
        std::cout << field->PartialName() << " = " << field->Value() << "\n";
    }
}

See Also