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!\n"; }
配置很重要
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<ItemGroup> <Library Include="..\x64\Debug\cximage.lib" /> <Library Include="..\x64\Debug\jasper.lib" /> <Library Include="..\x64\Debug\jbig.lib" /> <Library Include="..\x64\Debug\Jpeg.lib" /> <Library Include="..\x64\Debug\libdcr.lib" /> <Library Include="..\x64\Debug\mng.lib" /> <Library Include="..\x64\Debug\png.lib" /> <Library Include="..\x64\Debug\Tiff.lib" /> <Library Include="..\x64\Debug\zlib.lib" /> </ItemGroup> <ItemGroup> <ClInclude Include="..\CxImage\xfile.h" /> <ClInclude Include="..\CxImage\ximabmp.h" /> <ClInclude Include="..\CxImage\ximacfg.h" /> <ClInclude Include="..\CxImage\ximadef.h" /> <ClInclude Include="..\CxImage\ximage.h" /> <ClInclude Include="..\CxImage\ximagif.h" /> <ClInclude Include="..\CxImage\ximaico.h" /> <ClInclude Include="..\CxImage\ximaiter.h" /> <ClInclude Include="..\CxImage\ximajas.h" /> <ClInclude Include="..\CxImage\ximajbg.h" /> <ClInclude Include="..\CxImage\ximajpg.h" /> <ClInclude Include="..\CxImage\ximamng.h" /> <ClInclude Include="..\CxImage\ximapcx.h" /> <ClInclude Include="..\CxImage\ximapng.h" /> <ClInclude Include="..\CxImage\ximaraw.h" /> <ClInclude Include="..\CxImage\ximaska.h" /> <ClInclude Include="..\CxImage\ximatga.h" /> <ClInclude Include="..\CxImage\ximath.h" /> <ClInclude Include="..\CxImage\ximatif.h" /> <ClInclude Include="..\CxImage\ximawbmp.h" /> <ClInclude Include="..\CxImage\ximawmf.h" /> <ClInclude Include="..\CxImage\xiofile.h" /> <ClInclude Include="..\CxImage\xmemfile.h" /> </ItemGroup> <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" /> <ImportGroup Label="ExtensionTargets"> </ImportGroup> </Project>
这个是完整的配置。（这块搞了大半天） 执行完效果 如下图
