批量缩放PNG图片.

最近需要缩放N多图片,

找遍了互联网也没有找到方便使用的批量缩放工具..

趁着周末写一个练手..

 #include <iostream>
 #include <vector>
 #include <list>
 #include <string>
 #include <iterator>
 #include <functional>
 #include <memory>
 #include <fstream>
 #include <sstream>

 #include <Shlwapi.h>
 #include <Windows.h>
 #include <gdiplus.h>

 #pragma comment(lib, "gdiplus.lib")
 #pragma comment(lib, "Shlwapi.lib")

 inline std::wstring getDirectory(const std::wstring &fullname)
 {
     auto findIndex = fullname.find_last_of('\\');
     return findIndex != std::wstring::npos
         ? fullname.substr(, findIndex + ) : std::wstring();
 }

 inline std::wstring getFullName(const std::wstring &fullname)
 {
     auto findIndex = fullname.find_last_of('\\');
     return findIndex != std::wstring::npos
         ? fullname.substr(findIndex + ) : std::wstring();
 }

 template <class T1, class T2>
 inline T1 parseTo(const T2 &t)
 {
     static std::wstringstream sstream;
     T1 r;
     sstream << t;
     sstream >> r;
     sstream.clear();
     return r;
 }

 CLSID findCLSID(const std::wstring &format)
 {
     CLSID clsid = {  };
     auto num = 0u;
     auto size = 0u;
     Gdiplus::GetImageEncodersSize(&num, &size);
     )
     {
         auto pImageCodecInfo = (Gdiplus::ImageCodecInfo*)(malloc(size));
         if (pImageCodecInfo != nullptr)
         {
             GetImageEncoders(num, size, pImageCodecInfo);

             ; j< num; ++j)
             {
                 if (format == pImageCodecInfo[j].MimeType)
                 {
                     clsid = pImageCodecInfo[j].Clsid;
                     break;
                 }
             }
             free(pImageCodecInfo);
         }
     }
     return clsid;
 }

 void forEachFileList(
     const std::wstring &fileListName,
     const std::function<void (const std::wstring &)> &handler)
 {
     std::wifstream ifile(fileListName);
     if (ifile)
     {
         std::wstring fileName;
         while (std::getline(ifile, fileName))
         {
             handler(fileName);
         }
         ifile.close();
     }
 }

 int createSaveDirector(const std::wstring &director)
 {
     auto result = true;
     if (!PathFileExists(director.c_str()))
     {
         result = CreateDirectory(director.c_str(), nullptr) != ;
     }
     return result;
 }

 void saveImage(Gdiplus::Bitmap *pImage, const CLSID &clsid, const std::wstring &saveFile)
 {
     auto director = getDirectory(saveFile);
     director.append(L"\\save\\");
     if (createSaveDirector(director))
     {
         director.append(getFullName(saveFile));
         std::wcout
             << L"save image file: "
             << director << std::endl;
         pImage->Save(director.c_str(), &clsid);
     }
 }

 void scaleImage(const std::wstring &fileName, const CLSID &clsid, float scalex, float scaley)
 {
     Gdiplus::Bitmap image(fileName.c_str());
     if (image.GetLastStatus() == Gdiplus::Ok)
     {
         auto srcWidth= image.GetWidth();
         auto srcHeight = image.GetHeight();
         auto dstWidth = srcWidth * scalex;
         auto dstHeight = srcHeight * scaley;
         Gdiplus::Bitmap newImage((u_int)dstWidth, (u_int)dstHeight);
         Gdiplus::Graphics graphics(&newImage);
         graphics.DrawImage(&image, 0u, 0u, dstWidth, dstHeight);
         saveImage(&newImage, clsid, fileName);
     }
 }

 void run(const std::wstring &fileList, float scalex, float scaley)
 {
     u_long token;
     Gdiplus::GdiplusStartupInput input;
     Gdiplus::GdiplusStartup(&token, &input, nullptr);
     {
         auto clsid = findCLSID(L"image/png");
          || clsid.Data2 !=  || clsid.Data3 != )
         {
             forEachFileList(
                 fileList,
                 std::bind(scaleImage, std::placeholders::_1, clsid, scalex, scaley));
         }
     }
     Gdiplus::GdiplusShutdown(token);
 }

 int wmain(int argn, wchar_t *argc[])
 {
     std::locale(std::locale::global(std::locale("chs")));
     std::wcout << argn << std::endl;
     )
     {
         std::wcout
             << L"参数格式: "
             << L"imglist.txt scalex scaley"
             << std::endl;
     }
     else
     {
         run(argc[],
             parseTo<]),
             parseTo<]));
     }
     std::wcout << L"run done." << std::endl;
     std::wcin.get();
     ;
 }

下载地址

使用说明:

　　在控制台下运行即可.

运行需要三个参数分别是: 需要缩放的图片路径列表, x缩放之, y缩放值.

第一个参数是一个包含了需要被缩放的图片路径列表, 是纯文本文件, 可以用cmd命令来生成:

for /r %%i in(.,*) do echo %%i>>.\filelist.txt

路径列表图

缩放0.1效果图