C++ 文件读写。怎么得到图片的像素？


 1 #include "ImageRec.h"
 2 using namespace std;
 3 
 4  void ImageRec::getImageFile()
 5 {
 6     fstream img("1.jpg", fstream::in | ios::binary);
 7     fstream imgout("2.jpg", fstream::out | ios::binary);
 8     img.seekg(0, img.end);
 9     long length = img.tellg();
10     img.seekg(0, img.beg);
11     if (length>0)
12     {
13         char* buffer = new char[length];
14         img.read(buffer, length);
15 
16 
17 
18         imgout.write(buffer,length);
19         delete[] buffer;
20     }
21     img.close();
22     imgout.close();
23 
24     return ;
25 }

C++ 文件读写。怎么得到图片的像素？

 https://github.com/irwir/CxImage

https://github.com/wavescholar/CxImageVS2010    这个可以用

使用方法https://www.cnblogs.com/lidabo/p/6923426.html

#include <iostream>
#include <string>
#include <fstream>
#include "../CxImage/xfile.h"
#include "../CxImage/ximajpg.h"
#include "../CxImage/ximabmp.h"
using namespace std;
#pragma comment(lib,"CxImage.lib")
int main()
{
    fstream img("1.jpg", fstream::in | ios::binary);

    CxImage  image;
    // bmp -> jpg     
    image.Load("1.jpg", CXIMAGE_FORMAT_JPG);
    if (image.IsValid()) {
        /*if (!image.IsGrayScale()) image.IncreaseBpp(24);
        image.SetJpegQuality(80);
        image.Save("1.bmp", CXIMAGE_FORMAT_BMP);*/

        CxImage  imageG;
        image.SplitRGB(nullptr, &imageG, nullptr);
        imageG.Save("1g.jpg", CXIMAGE_FORMAT_JPG);
        //imageG.arr

    }
    // png -> tif     
    //image.Load("image.png", CXIMAGE_FORMAT_PNG);
    //if (image.IsValid()) {
    //    image.Save("image.tif", CXIMAGE_FORMAT_TIF);
    //}

    //fstream imgout("2.jpg", fstream::out | ios::binary);
    img.seekg(0, img.end);
    long length = img.tellg();
    img.seekg(0, img.beg);
    if (length > 0)
    {
        char* buffer = new char[length];
        //char* buffer = new char[length];
        img.read(buffer, length);
        CxFile* fimg;
            memset(&fimg, 0, length); 
        //fimg()
        fimg->Write(buffer, length,1);
        CxImageJPG jpg;
       bool s= jpg.Decode(fimg);


        //imgout.write(buffer, length);
        delete[] buffer;
    }
    img.close();
    //imgout.close();

 
    //jpg.get
    //    ximajpg
    std::cout << "Hello World!
";
}
View Code

配置很重要

  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
    <ClCompile>
      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
      <InlineFunctionExpansion>Default</InlineFunctionExpansion>
      <FunctionLevelLinking>false</FunctionLevelLinking>
      <Optimization>Disabled</Optimization>
      <SuppressStartupBanner>true</SuppressStartupBanner>
      <WarningLevel>Level3</WarningLevel>
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
      <AdditionalIncludeDirectories>..jpeg;..png;..zlib;..mng;..	iff;..j2k;..jasperinclude;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;JAS_WIN_MSVC_BUILD;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <AssemblerListingLocation>.Debug</AssemblerListingLocation>
      <PrecompiledHeaderOutputFile>.Debugcximage.pch</PrecompiledHeaderOutputFile>
      <ObjectFileName>.Debug</ObjectFileName>
      <ProgramDataBaseFileName>.Debug</ProgramDataBaseFileName>
      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <AdditionalLibraryDirectories>..x64Debug;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
    </Link>
  </ItemDefinitionGroup>
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|Win32">
      <Configuration>Release</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Debug|x64">
      <Configuration>Debug</Configuration>
      <Platform>x64</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|x64">
      <Configuration>Release</Configuration>
      <Platform>x64</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <VCProjectVersion>16.0</VCProjectVersion>
    <Keyword>Win32Proj</Keyword>
    <ProjectGuid>{cf48985e-1232-48ba-9ba3-5101a0d51269}</ProjectGuid>
    <RootNamespace>ConsoleApplication1</RootNamespace>
    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
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  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v142</PlatformToolset>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <PlatformToolset>v142</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <PlatformToolset>v142</PlatformToolset>
    <CharacterSet>MultiByte</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <PlatformToolset>v142</PlatformToolset>
    <WholeProgramOptimization>true</WholeProgramOptimization>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="Shared">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <Import Project="$(UserRootDir)Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
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  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <LinkIncremental>false</LinkIncremental>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
    <LinkIncremental>true</LinkIncremental>
    <ReferencePath>$(VC_ReferencesPath_x64);$(ReferencePath)</ReferencePath>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
    <LinkIncremental>false</LinkIncremental>
  </PropertyGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
      <InlineFunctionExpansion>Default</InlineFunctionExpansion>
      <FunctionLevelLinking>false</FunctionLevelLinking>
      <Optimization>Disabled</Optimization>
      <SuppressStartupBanner>true</SuppressStartupBanner>
      <WarningLevel>Level3</WarningLevel>
      <MinimalRebuild>true</MinimalRebuild>
      <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
      <AdditionalIncludeDirectories>..jpeg;..png;..zlib;..mng;..	iff;..j2k;..jasperinclude;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;JAS_WIN_MSVC_BUILD;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <AssemblerListingLocation>.Debug</AssemblerListingLocation>
      <PrecompiledHeaderOutputFile>.Debugcximage.pch</PrecompiledHeaderOutputFile>
      <ObjectFileName>.Debug</ObjectFileName>
      <ProgramDataBaseFileName>.Debug</ProgramDataBaseFileName>
      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <ClCompile>
      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
      <StringPooling>true</StringPooling>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <Optimization>MaxSpeed</Optimization>
      <SuppressStartupBanner>true</SuppressStartupBanner>
      <WarningLevel>Level3</WarningLevel>
      <AdditionalIncludeDirectories>..jpeg;..png;..zlib;..mng;..	iff;..j2k;..jasperinclude;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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      <AssemblerListingLocation>.Release</AssemblerListingLocation>
      <PrecompiledHeaderOutputFile>.Releasecximage.pch</PrecompiledHeaderOutputFile>
      <ObjectFileName>.Release</ObjectFileName>
      <ProgramDataBaseFileName>.Release</ProgramDataBaseFileName>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
      <GenerateDebugInformation>true</GenerateDebugInformation>
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      <Optimization>Disabled</Optimization>
      <SuppressStartupBanner>true</SuppressStartupBanner>
      <WarningLevel>Level3</WarningLevel>
      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
      <AdditionalIncludeDirectories>..jpeg;..png;..zlib;..mng;..	iff;..j2k;..jasperinclude;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;JAS_WIN_MSVC_BUILD;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <AssemblerListingLocation>.Debug</AssemblerListingLocation>
      <PrecompiledHeaderOutputFile>.Debugcximage.pch</PrecompiledHeaderOutputFile>
      <ObjectFileName>.Debug</ObjectFileName>
      <ProgramDataBaseFileName>.Debug</ProgramDataBaseFileName>
      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <AdditionalLibraryDirectories>..x64Debug;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
    <ClCompile>
      <WarningLevel>Level3</WarningLevel>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <SDLCheck>true</SDLCheck>
      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <ConformanceMode>true</ConformanceMode>
    </ClCompile>
    <Link>
      <SubSystem>Console</SubSystem>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
      <GenerateDebugInformation>true</GenerateDebugInformation>
    </Link>
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="ConsoleApplication1.cpp" />
  </ItemGroup>
  <ItemGroup>
    <Library Include="..x64Debugcximage.lib" />
    <Library Include="..x64Debugjasper.lib" />
    <Library Include="..x64Debugjbig.lib" />
    <Library Include="..x64DebugJpeg.lib" />
    <Library Include="..x64Debuglibdcr.lib" />
    <Library Include="..x64Debugmng.lib" />
    <Library Include="..x64Debugpng.lib" />
    <Library Include="..x64DebugTiff.lib" />
    <Library Include="..x64Debugzlib.lib" />
  </ItemGroup>
  <ItemGroup>
    <ClInclude Include="..CxImagexfile.h" />
    <ClInclude Include="..CxImageximabmp.h" />
    <ClInclude Include="..CxImageximacfg.h" />
    <ClInclude Include="..CxImageximadef.h" />
    <ClInclude Include="..CxImageximage.h" />
    <ClInclude Include="..CxImageximagif.h" />
    <ClInclude Include="..CxImageximaico.h" />
    <ClInclude Include="..CxImageximaiter.h" />
    <ClInclude Include="..CxImageximajas.h" />
    <ClInclude Include="..CxImageximajbg.h" />
    <ClInclude Include="..CxImageximajpg.h" />
    <ClInclude Include="..CxImageximamng.h" />
    <ClInclude Include="..CxImageximapcx.h" />
    <ClInclude Include="..CxImageximapng.h" />
    <ClInclude Include="..CxImageximaraw.h" />
    <ClInclude Include="..CxImageximaska.h" />
    <ClInclude Include="..CxImageximatga.h" />
    <ClInclude Include="..CxImageximath.h" />
    <ClInclude Include="..CxImageximatif.h" />
    <ClInclude Include="..CxImageximawbmp.h" />
    <ClInclude Include="..CxImageximawmf.h" />
    <ClInclude Include="..CxImagexiofile.h" />
    <ClInclude Include="..CxImagexmemfile.h" />
  </ItemGroup>
  <Import Project="$(VCTargetsPath)Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
</Project>
View Code

这个是完整的配置。（这块搞了大半天） 执行完效果 如下图  

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原文地址：https://www.cnblogs.com/mrguoguo/p/13595229.html