exifprint.cpp

Sample program to print Exif data from an image.

// ***************************************************************** -*- C++ -*-
// exifprint.cpp
// Sample program to print the Exif metadata of an image
#include <exiv2/exiv2.hpp>
#include <iostream>
#include <iomanip>
#include <cassert>
// https://github.com/Exiv2/exiv2/issues/468
#if defined(EXV_UNICODE_PATH) && defined(__MINGW__)
#undef EXV_UNICODE_PATH
#endif
#ifdef EXV_UNICODE_PATH
#define _tchar wchar_t
#define _tstrcmp wcscmp
#define _t(s) L##s
#define _tcout wcout
#define _tmain wmain
#else
#define _tchar char
#define _tstrcmp strcmp
#define _t(s) s
#define _tcout cout
#define _tmain main
#endif
int _tmain(int argc, _tchar* const argv[])
try {
const _tchar* prog = argv[0];
const _tchar* file = argv[1];
if (argc != 2) {
std::_tcout << _t("Usage: ") << prog << _t(" [ file | --version || --version-test ]") << std::endl;
return 1;
}
if ( _tstrcmp(file,_t("--version")) == 0 ) {
Exiv2::dumpLibraryInfo(std::cout,keys);
return 0;
} else if ( _tstrcmp(file,_t("--version-test")) == 0 ) {
// verifies/test macro EXIV2_TEST_VERSION
// described in include/exiv2/version.hpp
std::cout << "EXV_PACKAGE_VERSION " << EXV_PACKAGE_VERSION << std::endl
<< "Exiv2::version() " << Exiv2::version() << std::endl
<< "strlen(Exiv2::version()) " << ::strlen(Exiv2::version()) << std::endl
<< "Exiv2::versionNumber() " << Exiv2::versionNumber() << std::endl
<< "Exiv2::versionString() " << Exiv2::versionString() << std::endl
<< "Exiv2::versionNumberHexString() " << Exiv2::versionNumberHexString() << std::endl
;
// Test the Exiv2 version available at runtime but compile the if-clause only if
// the compile-time version is at least 0.15. Earlier versions didn't have a
// testVersion() function:
#if EXIV2_TEST_VERSION(0,15,0)
if (Exiv2::testVersion(0,13,0)) {
std::cout << "Available Exiv2 version is equal to or greater than 0.13\n";
} else {
std::cout << "Installed Exiv2 version is less than 0.13\n";
}
#else
std::cout << "Compile-time Exiv2 version doesn't have Exiv2::testVersion()\n";
#endif
return 0;
}
assert(image.get() != 0);
image->readMetadata();
Exiv2::ExifData &exifData = image->exifData();
if (exifData.empty()) {
std::string error("No Exif data found in file");
throw Exiv2::Error(Exiv2::kerErrorMessage, error);
}
for (Exiv2::ExifData::const_iterator i = exifData.begin(); i != end; ++i) {
const char* tn = i->typeName();
std::cout << std::setw(44) << std::setfill(' ') << std::left
<< i->key() << " "
<< "0x" << std::setw(4) << std::setfill('0') << std::right
<< std::hex << i->tag() << " "
<< std::setw(9) << std::setfill(' ') << std::left
<< (tn ? tn : "Unknown") << " "
<< std::dec << std::setw(3)
<< std::setfill(' ') << std::right
<< i->count() << " "
<< std::dec << i->value()
<< "\n";
}
return 0;
}
//catch (std::exception& e) {
//catch (Exiv2::AnyError& e) {
catch (Exiv2::Error& e) {
std::cout << "Caught Exiv2 exception '" << e.what() << "'\n";
return -1;
}