How to dump model protobuf ?

Shesha Sreenivasamurthy

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Mar 26, 2025, 10:04:59 PM3/26/25

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Greetings,

I am using the following method to dump the protobuf. But it is give me all garbage. Can someone let me know how to dump it ?

static void DumpPresolvedModelToPbtxt(const CpModelProto& model, const char *filename) {
    std::ofstream outfile(filename, std::ios::out);
    if (!outfile.is_open()) {
        std::cerr << "Failed to open file for writing: " << filename << std::endl;
        return;
    }
    model.SerializeToOstream(&outfile);
    std::cout << "Model has been dumped to " << filename << std::endl;
    outfile.close();
}

CpModelBuilder model;

Add the constraints here.

DumpPresolvedModelToPbtxt(model.Build(), "presolved_model.pbtxt");

Thanks,

Shesha

Laurent Perron

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Mar 26, 2025, 11:51:16 PM3/26/25

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There is an export to file method in all languages.

--Laurent

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Shesha Sreenivasamurthy

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Mar 27, 2025, 2:36:10 AM3/27/25

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#include <iostream>
#include <stdint.h>
#include <fstream>

#include <google/protobuf/text_format.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>

static void DumpPresolvedModelToPbtxt(const CpModelProto& model, const char *filename) {

    // Open the output file using std::ofstream
    std::ofstream output_file(filename);
    
    // Check if the file was successfully opened
    if (!output_file.is_open()) {
        std::cerr << "Failed to open the output file for writing." << std::endl;
        return;
    }

    // Wrap the std::ofstream with OstreamOutputStream
    google::protobuf::io::OstreamOutputStream ostream_output_stream(&output_file);

    // Serialize the message in human-readable text format and write to the file
    if (!google::protobuf::TextFormat::Print(model, &ostream_output_stream)) {
        std::cerr << "Failed to serialize message to text format." << std::endl;
        return;
    }

    std::cout << "Message successfully serialized to '" << filename << "' in human-readable format." << std::endl;
}

CpModelBuilder model;
DumpPresolvedModelToPbtxt(model.Proto(), "presolved_model.pbtxt");

Shesha Sreenivasamurthy

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Mar 27, 2025, 2:37:08 AM3/27/25

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While making use -lortools -lprotobuf

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