在C＃中使用jpegtran，jpegoptim或其他JPEG优化/压缩 [英] Using jpegtran, jpegoptim, or other jpeg optimization/compression in C#
问题描述
我有100的（也许1000年）。我需要优化图像文件大小尽可能没有松动的图像质量。
I've got 100's (maybe 1000's) of products with 10-30 images of each product coming to an online store I've put together. I need to optimize the images' file sizes as much as possible without loosing image quality.
我没有直接使用jpegtran，jpegoptim，或任何其他的JPEG优化，但我已经注意到，punypng缩小文件大小倒在较大的JPEG图像无损约4-6％。
I haven't used jpegtran, jpegoptim, or any other jpeg optimizer directly but I have noticed that punypng shrinks file sizes down about 4-6% on the larger jpeg images LOSSLESSLY.
元数据已经从图像的上传（通过jumpoader）期间中剥离，所以这是不是一种选择/问题了。
Meta data is already stripped from the images during upload (via jumpoader) so that is not an option/problem anymore.
有没有办法让JPEG优化之一从C＃代码运行吗？
Is there any way to get one of the jpeg optimizers to run from C# code?
请注意：我使用GoDaddy的共享与IIS7和.Net 3.5
Note: I'm using shared Godaddy hosting with IIS7 and .Net 3.5
推荐答案
如果你不举办 t等与临时文件一塌糊涂，我建议使用C ++ / CLI。
If you don't like to mess with temporary files, I'd advise to use C++/CLI.
创建Visual Studio中的C ++ / CLI DLL项目。创建一个静态管理类，只要你想从C＃中使用它们定义功能：
Create a C++/CLI dll project in visual studio. Create one static managed class, and define the functions as you want to use them from C#:
public ref class JpegTools
{
public:
static array<byte>^ Optimize(array<byte>^ input)
};
您定义可以从C＃直接调用这些功能，你可以与所有的C ++提供实现这些
These functions you define can be directly called from C#, and you can implement them with all that C++ offers.
阵列^对应一个C＃的字节数组。你需要使用pin_ptr<>引脚的字节数组在内存中，这样你就可以通过对数据到您所选择的非托管的Jpeg辅助函数。 C ++ / CLI有编组管理类型本地类型的充分支持。你也可以用gc_new分配新的数组，返回CLI兼容的类型。如果你有马歇尔字符串从C＃和C ++作为本练习的一部分，使用MFC / ATL的CString的类型。
array^ corresponds to a C# byte array. You'll need to use pin_ptr<> to pin the byte array in memory, so you can pass on the data to the unmanaged Jpeg helper function of your choice. C++/CLI has ample support for marshalling managed types to native types. You can also allocate new array with gc_new, to return CLI compatible types. If you have to marshall strings from C# to C++ as part of this excercise, use Mfc/Atl's CString type.
您可以静态链接的所有JPEG代码到DLL。 A C ++的dll可以混合纯天然和C ++ / CLI代码。在我们的C ++ / CLI的项目，通常只有接口的源文件了解CLI类型，所有用C ++类，其余的工作。
You can statically link all the jpeg code into the dll. A C++ dll can be mixed pure native and C++/CLI code. In our C++/CLI projects, typically only the interface source files know about CLI types, all the rest work with with C++ types.
还有一些开销工作得到持续这种方式，不过好处是，你的代码是编译时typechecked，以及所有与unmanged代码和内存的交易得到处理在C ++的一面。它的实际工作这么好，我用C ++ / CLI单元测试本地C ++代码几乎直接与NUnit的。
There's some overhead work to get going this way, but the upside is that your code is compile-time typechecked, and all the dealings with unmanged code and memory are dealt with on the C++ side. It actually works so well that I used C++/CLI to unit test native C++ code almost directly with NUnit.
祝你好运！
这篇关于在C＃中使用jpegtran，jpegoptim或其他JPEG优化/压缩的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
