exifprint.cpp

Sample program to print Exif data from an image.

// ***************************************************************** -*- C++ -*-
/*
* Copyright (C) 2004-2021 Exiv2 authors
* This program is part of the Exiv2 distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
*/
#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 {
Exiv2::XmpParser::initialize();
::atexit(Exiv2::XmpParser::terminate);
#ifdef EXV_ENABLE_BMFF
Exiv2::enableBMFF();
#endif
const _tchar* prog = argv[0];
const _tchar* file = argv[1];
if (argc != 2) {
std::_tcout << _t("Usage: ") << prog << _t(" [ path | --version | --version-test ]") << std::endl;
return 1;
}
if ( _tstrcmp(file,_t("--version")) == 0 ) {
exv_grep_keys_t keys;
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;
}
Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(file);
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);
}
Exiv2::ExifData::const_iterator end = exifData.end();
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->toString()
<< "\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;
}
Exiv2::BasicError
Simple error class used for exceptions. An output operator is provided to print errors to a stream.
Definition: error.hpp:264
Exiv2::BasicError::what
virtual const char * what() const
Return the error message as a C-string. The pointer returned by what() is valid only as long as the B...
Definition: error.hpp:381
Exiv2::ExifData
A container for Exif data. This is a top-level class of the Exiv2 library. The container holds Exifda...
Definition: exif.hpp:434
Exiv2::ExifData::empty
bool empty() const
Return true if there is no Exif metadata.
Definition: exif.hpp:512
Exiv2::ExifData::const_iterator
ExifMetadata::const_iterator const_iterator
ExifMetadata const iterator type.
Definition: exif.hpp:439
Exiv2::ExifData::begin
iterator begin()
Begin of the metadata.
Definition: exif.hpp:490
Exiv2::ExifData::end
iterator end()
End of the metadata.
Definition: exif.hpp:492
Exiv2::ImageFactory::open
static Image::AutoPtr open(const std::string &path, bool useCurl=true)
Create an Image subclass of the appropriate type by reading the specified file. Image type is derived...
Definition: image.cpp:922
Exiv2::Image::AutoPtr
std::auto_ptr< Image > AutoPtr
Image auto_ptr type.
Definition: image.hpp:81
Exiv2::XmpParser::initialize
static bool initialize(XmpParser::XmpLockFct xmpLockFct=0, void *pLockData=0)
Initialize the XMP Toolkit.
Definition: xmp.cpp:641
Exiv2::XmpParser::terminate
static void terminate()
Terminate the XMP Toolkit and unregister custom namespaces.
Definition: xmp.cpp:703
Exiv2::version
EXIV2API const char * version()
Return the version of Exiv2 as "C" string eg "0.27.0.2".
Definition: version.cpp:103
Exiv2::versionNumberHexString
EXIV2API std::string versionNumberHexString()
Return the version of Exiv2 as hex string of fixed length 6.
Definition: version.cpp:96
Exiv2::versionString
EXIV2API std::string versionString()
Return the version string Example: "0.25.0" (major.minor.patch)
Definition: version.cpp:89
Exiv2::dumpLibraryInfo
EXIV2API void dumpLibraryInfo(std::ostream &os, const exv_grep_keys_t &keys)
dumpLibraryInfo implements the exiv2 option –version –verbose used by exiv2 test suite to inspect lib...
Definition: version.cpp:235
Exiv2::versionNumber
EXIV2API int versionNumber()
Return the version of Exiv2 available at runtime as an integer.
Definition: version.cpp:84
Exiv2::testVersion
EXIV2API bool testVersion(int major, int minor, int patch)
Test the version of the available Exiv2 library at runtime. Return true if it is the same as or newer...
Definition: version.cpp:108
Exiv2::Error
BasicError< char > Error
Error class used for exceptions (std::string based)
Definition: error.hpp:324