如何使用C ++读取8位灰度JPEG图像？ [英] How to read a 8-bit grayscale JPEG image using C++?
问题描述
您能告诉我使用C ++读取8位
灰度JPEG的最简单代码是什么？
非常感谢，
速度。
Hi,
Could you please tell me what is the simplest code to read a 8-bit
grayscale JPEG using C++?
Thanks a ton,
Speed.
推荐答案
Speed写道：
Speed wrote:
能告诉我8位读取的最简单的代码是什么
使用C ++的灰度JPEG？
Hi,
Could you please tell me what is the simplest code to read a 8-bit
grayscale JPEG using C++?
你在comp.lang.c中问了同样的基本问题。选择一种语言。
Brian
You asked the same basic question in comp.lang.c. Pick a language.
Brian
默认用户写道：
Default User wrote:
Speed写道：
Speed wrote:
>
你能告诉我什么是最简单的代码来阅读使用C ++的8位
灰度JPEG？
>Hi,
Could you please tell me what is the simplest code to read a 8-bit
grayscale JPEG using C++?
你在comp.lang.c中问了同样的基本问题。选择一种语言。
You asked the same basic question in comp.lang.c. Pick a language.
你确定它是同一个问题吗？我希望那个，那边，他好b $ b已经问过
你能告诉我什么是读取8位的最简单的代码
使用C的灰度JPEG？
在这种情况下，也许他希望在收到答案后推迟选择语言，直到
。
对OP：C ++标准没有对JPEG
文件做出任何特殊规定。尽管你可能正在寻找一个l3rd派对图书馆
解决方案，但请注意这些是在这个组中的偏离主题。
阅读二进制文件完全进入内存，你可以在C ++中使用这样的代码
：
#include< iterator>
＃包括< fstream>
#include< vector>
#include< iostream>
typedef std :: vector< ; char缓冲区;
int main（void）{
//读取文件：
std :: ifstream infile（" speed_001.cc"，std :: ios :: binary）;
缓冲区the_buf（std :: istreambuf_iterator< char>（infile），
（std :: istreambuf_iterator< char>（）））;
//写数据：
std :: cout<< the_buf.size（）<< ''\ n'';
std :: copy（the_buf.begin（），the_buf.end（），
std :: ostream_iterator< char>（std :: cout，""））;
std :: cout<< ''\ n'';
}
最好
Kai-Uwe Bux
Are you sure it was the same question? I would expect that, over there, he
had asked
Could you please tell me what is the simplest code to read a 8-bit
grayscale JPEG using C?
In that case, maybe he would like to defer the choice of the language until
after he received answers.
To the OP: the C++ standard does not make any special provisions for JPEG
files. In as much as you might be looking for a l3rd party library
solution, please note that those are off-topic in this group.
To read a binary file completely into memory, you could use code like this
in C++:
#include <iterator>
#include <fstream>
#include <vector>
#include <iostream>
typedef std::vector< char buffer;
int main ( void ) {
// read file:
std::ifstream infile ( "speed_001.cc", std::ios::binary );
buffer the_buf ( std::istreambuf_iterator<char>( infile ),
(std::istreambuf_iterator<char>()) );
// write data:
std::cout << the_buf.size() << ''\n'';
std::copy( the_buf.begin(), the_buf.end(),
std::ostream_iterator<char>( std::cout, "" ) );
std::cout << ''\n'';
}
Best
Kai-Uwe Bux
Speed< lo ********** @ gmail.comwrote in message ...
Speed <lo**********@gmail.comwrote in message...
您好，
您能否告诉我使用C ++读取8位
灰度JPEG的最简单代码是什么？
非常感谢，
速度。
Hi,
Could you please tell me what is the simplest code to read a 8-bit
grayscale JPEG using C++?
Thanks a ton,
Speed.
#include< iostream>
#include< fstream>
#include< vector>
{
std :: ifstream PicIn（" MyPic.jpg"，
std :: ios_base :: in | std :: ios_base :: binary）;
if（not PicIn.is_open（））{
std :: cout<<" \ n FAILED"< ;< std :: endl;
返回EXIT_FAILURE;
}
std :: vector< unsigned charImage;
while（PicIn.peek（）！= EOF）{//你没说''最快''< G>
Image.push_back（PicIn.get） （））;
}
std :: cout<<" \ n Image.size（）="
<<< Image.size（）<<"" bytes。"<< std :: endl;
PicIn.close（）;
}
-
Bob R
POVrookie
#include <iostream>
#include <fstream>
#include <vector>
{
std::ifstream PicIn( "MyPic.jpg",
std::ios_base::in | std::ios_base::binary );
if( not PicIn.is_open() ){
std::cout<<"\n FAILED"<<std::endl;
return EXIT_FAILURE;
}
std::vector<unsigned charImage;
while( PicIn.peek() != EOF ){ // you didn''t say ''fastest'' <G>
Image.push_back( PicIn.get() );
}
std::cout<<"\n Image.size() = "
<<Image.size()<<" bytes."<<std::endl;
PicIn.close();
}
--
Bob R
POVrookie
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