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Improved error message you get about linking to libjpeg and libpng 

if you try to open a jpeg or png file.
This commit is contained in:
Davis King 2016-01-17 12:06:53 -05:00
parent da6e48071c
commit eee0d295c3
1 changed files with 29 additions and 6 deletions
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35
dlib/image_loader/load_image.h
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@ -9,6 +9,7 @@
#include "jpeg_loader.h"
#include "image_loader.h"
#include <fstream>
#include <sstream>
namespace dlib
{
@ -71,15 +72,37 @@ namespace dlib
if (im_type == image_file_type::JPG)
{
throw image_load_error("Unable to load image in file " + file_name + ".\n" +
"You must #define DLIB_JPEG_SUPPORT and link to libjpeg to read JPEG files.\n" +
"Do this by following the instructions at http://dlib.net/compile.html.");
std::ostringstream sout;
sout << "Unable to load image in file " + file_name + ".\n" +
"You must #define DLIB_JPEG_SUPPORT and link to libjpeg to read JPEG files.\n" +
"Do this by following the instructions at http://dlib.net/compile.html.\n\n";
#ifdef _MSC_VER
sout << "Note that you must cause DLIB_JPEG_SUPPORT to be defined for your entire project.\n";
sout << "So don't #define it in one file, add it to the C/C++->Preprocessor->Preprocessor Definitions\n";
sout << "field in Visual Studio's Property Pages window so it takes effect for your entire application.";
#else
sout << "Note that you must cause DLIB_JPEG_SUPPORT to be defined for your entire project.\n";
sout << "So don't #define it in one file, use a compiler switch like -DDLIB_JPEG_SUPPORT\n";
sout << "so it takes effect for your entire application.";
#endif
throw image_load_error(sout.str());
}
else if (im_type == image_file_type::PNG)
{
throw image_load_error("Unable to load image in file " + file_name + ".\n" +
"You must #define DLIB_PNG_SUPPORT and link to libpng to read PNG files.\n" +
"Do this by following the instructions at http://dlib.net/compile.html.");
std::ostringstream sout;
sout << "Unable to load image in file " + file_name + ".\n" +
"You must #define DLIB_PNG_SUPPORT and link to libpng to read PNG files.\n" +
"Do this by following the instructions at http://dlib.net/compile.html.\n\n";
#ifdef _MSC_VER
sout << "Note that you must cause DLIB_PNG_SUPPORT to be defined for your entire project.\n";
sout << "So don't #define it in one file, add it to the C/C++->Preprocessor->Preprocessor Definitions\n";
sout << "field in Visual Studio's Property Pages window so it takes effect for your entire application.\n";
#else
sout << "Note that you must cause DLIB_PNG_SUPPORT to be defined for your entire project.\n";
sout << "So don't #define it in one file, use a compiler switch like -DDLIB_PNG_SUPPORT\n";
sout << "so it takes effect for your entire application.";
#endif
throw image_load_error(sout.str());
}
else
{