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Clarify the DLL hell problem

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git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@154 632fc199-4ca6-4c93-a231-07263d6284db
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DRC
2010-02-25 06:21:12 +00:00
parent 7e0b499ee7
commit 0248dd9aeb
1 changed files with 12 additions and 6 deletions
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18
README-turbo.txt
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@@ -65,7 +65,7 @@ links to the libjpeg dynamic library located in /opt/libjpeg-turbo/{lib}. This
will effectively accelerate every dynamically linked libjpeg application on the will effectively accelerate every dynamically linked libjpeg application on the
system. system.
The Windows version of libjpeg-turbo installs jpeg62.dll into The Windows distribution of the libjpeg-turbo SDK installs jpeg62.dll into
c:\libjpeg-turbo\bin, and the PATH environment variable can be modified such c:\libjpeg-turbo\bin, and the PATH environment variable can be modified such
that this directory is searched before any others that might contain that this directory is searched before any others that might contain
jpeg62.dll. However, if jpeg62.dll also exists in an application's install jpeg62.dll. However, if jpeg62.dll also exists in an application's install
@@ -74,11 +74,17 @@ if an application ships with jpeg62.dll, then back up the application's version
of jpeg62.dll and copy c:\libjpeg-turbo\bin\jpeg62.dll into the application's of jpeg62.dll and copy c:\libjpeg-turbo\bin\jpeg62.dll into the application's
install directory to accelerate it. install directory to accelerate it.
libjpeg-turbo's version of jpeg62.dll requires the Visual C++ 2008 C run time The version of jpeg62.dll distributed in the libjpeg-turbo SDK requires the
DLL (msvcr90.dll). This library ships with more recent versions of Windows, Visual C++ 2008 C run time DLL (msvcr90.dll). This library ships with more
but users of older versions can obtain it from the Visual C++ 2008 recent versions of Windows, but users of older versions can obtain it from the
Redistributable Package, which is available as a free download from Microsoft's Visual C++ 2008 Redistributable Package, which is available as a free download
web site. from Microsoft's web site.
NOTE: Features of libjpeg which require passing a C run time structure, such
as a file handle, from an application to libjpeg will probably not work with
the distributed version of jpeg62.dll unless the application is also built to
use the Visual C++ 2008 C run time DLL. In particular, this affects
jpeg_stdio_dest() and jpeg_stdio_src().
Mac applications typically embed their own copies of libjpeg.62.dylib inside Mac applications typically embed their own copies of libjpeg.62.dylib inside
the (hidden) application bundle, so it is not possible to globally replace the (hidden) application bundle, so it is not possible to globally replace