//MakePNG.h  #pragma once #include <GdiPlus.h> using namespace Gdiplus; #pragma comment(lib,"GdiPlus.lib")  class CMakePNG { public:  CMakePNG(void);  ~CMakePNG(void);   BOOL MakePNG(HDC hDC,CRect rect,CString strFilePath);  BOOL BMptoPNG(LPCWSTR StrBMp,LPCWSTR StrPNG);  BOOL PNGtoBMp(LPCWSTR StrPNG,LPCWSTR StrBMp);  BOOL GetEncoderClsid(WCHAR* pFormat,CLSID* pClsid); private:  GdiplusStartupInput m_gdiplusStartupInput;  ULONG_PTR m_pGdiToken; }; 

//MakePNG.cpp  #include "StdAfx.h" #include "MakePNG.h"  CMakePNG::CMakePNG(void) {  GdiplusStartup(&m_pGdiToken,&m_gdiplusStartupInput,NULL); }  CMakePNG::~CMakePNG(void) { }  /***************************************************************************/ /* 功能： 根據rect屏幕抓圖，保存為文件名為strFilePath的PNG圖像文件 */ /* 輸入參數： HDC hDC   屏幕HDC；    */ /*  CRect rect  需要的矩形;   */ /*  CString strFilePath 保存文件全路徑（含后綴名）; */ /***************************************************************************/ BOOL CMakePNG::MakePNG(HDC hDC, CRect rect, CString strFilePath) {  BITMAP bmp;  PBITMAPINFO pbmi;  PBITMAPINFOHEADER pbih; // bitmap info-header  BITMAPFILEHEADER hdr; // bitmap file-header  WORD cClrBits;  LPBYTE lpBits;  // memory pointer  DWORD dwTmp;  DWORD cb;   // incremental count of bytes  BYTE *hp;   // byte pointer  HANDLE hfile;  // file handle  CString szBMPFilename = strFilePath.Left(strFilePath.GetLength() - 3) + _T("bmp");//先保存成位圖  HDC hdcCompatible = CreateCompatibleDC(hDC);  HBITMAP hbmScreen = CreateCompatibleBitmap(hDC, rect.Width(), rect.Height());   if (hbmScreen == NULL)  {  AfxMessageBox(_T("CreateCompatibleBitmap() error"));  return FALSE;  }   // Select the bitmaps into the compatible DC.   if (!SelectObject(hdcCompatible, hbmScreen))  {  AfxMessageBox(_T("Compatible Bitmap Selection error"));  return FALSE;  }   //Copy color data for the entire display into a  //bitmap that is selected into a compatible DC.   if (!BitBlt(hdcCompatible,  0,0,  rect.Width(), rect.Height(),  hDC,  rect.left,rect.top,  SRCCOPY))  {  AfxMessageBox(_T("Screen to Compat Blt Failed"));  return FALSE;  }   // Retrieve the bitmap's color format, width, and height.  if (!GetObject(hbmScreen, sizeof(BITMAP), (LPSTR)&bmp))  {  AfxMessageBox(_T("GetObject()出錯！"));  return FALSE;  }  // Convert the color format to a count of bits.  cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);  if (cClrBits == 1)  cClrBits = 1;  else if (cClrBits <= 4)  cClrBits = 4;  else if (cClrBits <= 8)  cClrBits = 8;  else if (cClrBits <= 16)  cClrBits = 16;  else if (cClrBits <= 24)  cClrBits = 24;  else cClrBits = 32;   // Allocate memory for the BITMAPINFO structure. (This structure  // contains a BITMAPINFOHEADER structure and an array of RGBQUAD  // data structures.)   if (cClrBits != 24)  pbmi = (PBITMAPINFO) LocalAlloc(LPTR,  sizeof(BITMAPINFOHEADER) +  sizeof(RGBQUAD) * (1<< cClrBits));   // There is no RGBQUAD array for the 24-bit-per-pixel format.   else  pbmi = (PBITMAPINFO) LocalAlloc(LPTR,  sizeof(BITMAPINFOHEADER));   // Initialize the fields in the BITMAPINFO structure.   pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);  pbmi->bmiHeader.biWidth = bmp.bmWidth;  pbmi->bmiHeader.biHeight = bmp.bmHeight;  pbmi->bmiHeader.biPlanes = bmp.bmPlanes;  pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;  if (cClrBits < 24)  pbmi->bmiHeader.biClrUsed = (1<<cClrBits);   // If the bitmap is not compressed, set the BI_RGB flag.  pbmi->bmiHeader.biCompression = BI_RGB;   // Compute the number of bytes in the array of color  // indices and store the result in biSizeImage.  pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8  * pbmi->bmiHeader.biHeight;  // Set biClrImportant to 0, indicating that all of the device colors are important.  pbmi->bmiHeader.biClrImportant = 0;   pbih = (PBITMAPINFOHEADER) pbmi;  lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);   if (!lpBits)  {  AfxMessageBox(_T("內存分配錯誤！"));  return FALSE;  }  // Retrieve the color table (RGBQUAD array) and the bits  // (array of palette indices) from the DIB.  if (!GetDIBits(hDC, hbmScreen, 0, (WORD) pbih->biHeight, lpBits, pbmi,  DIB_RGB_COLORS))  {  AfxMessageBox(_T("GetDIBits() error"));  return FALSE;  }   // Create the .BMP file.  hfile = CreateFile(szBMPFilename,  GENERIC_READ | GENERIC_WRITE,  (DWORD) 0,  NULL,  CREATE_ALWAYS,  FILE_ATTRIBUTE_NORMAL,  (HANDLE) NULL);  if (hfile == INVALID_HANDLE_VALUE)  {   AfxMessageBox(_T("創建文件失敗"));  return false;  }  hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"  // Compute the size of the entire file.  hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) +  pbih->biSize + pbih->biClrUsed  * sizeof(RGBQUAD) + pbih->biSizeImage);  hdr.bfReserved1 = 0;  hdr.bfReserved2 = 0;   // Compute the offset to the array of color indices.  hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +  pbih->biSize + pbih->biClrUsed  * sizeof (RGBQUAD);   // Copy the BITMAPFILEHEADER into the .BMP file.  if (!WriteFile(hfile, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),  (LPDWORD) &dwTmp, NULL))  {   AfxMessageBox(_T("寫BMP文件頭失敗"));  return FALSE;  }   // Copy the BITMAPINFOHEADER and RGBQUAD array into the file.  if (!WriteFile(hfile, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)  + pbih->biClrUsed * sizeof (RGBQUAD),  (LPDWORD) &dwTmp, ( NULL)))  {   AfxMessageBox(_T("寫BMP文件頭失敗"));  return FALSE;  }   // Copy the array of color indices into the .BMP file.  cb = pbih->biSizeImage;  hp = lpBits;  if (!WriteFile(hfile, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))  {  AfxMessageBox(_T("寫入BMP文件失敗"));  return FALSE;  }   // Close the .BMP file.  if (!CloseHandle(hfile))  {   AfxMessageBox(_T("Can't close BMP file."));  }   // Free memory.  GlobalFree((HGLOBAL)lpBits);   //轉換成PNG  if(!BMptoPNG(szBMPFilename,strFilePath))  {  DeleteFile(szBMPFilename);  return FALSE;  }  DeleteObject(hbmScreen);  DeleteFile(szBMPFilename);  return TRUE; } // //轉換BMP文件為PNG文件  BOOL CMakePNG::BMptoPNG(LPCWSTR StrBMp,LPCWSTR StrPNG) {  CLSID encoderClsid;  Status stat;  Image* image = NULL;  image = Bitmap::FromFile(StrBMp,TRUE);  if (!GetEncoderClsid(L"image/png",&encoderClsid))  {  return FALSE;  }  stat = image->Save(StrPNG,&encoderClsid,NULL);  if (stat != Ok)  {  return FALSE;  }  delete image;  return TRUE; }  // 功能描述: 轉換PNG文件為BMP文件 BOOL CMakePNG::PNGtoBMp(LPCWSTR StrPNG,LPCWSTR StrBMp) {  CLSID encoderClsid;  Status stat;  Image* pImage;  pImage = Bitmap::FromFile(StrPNG,TRUE);  if (!GetEncoderClsid(L"image/bmp",&encoderClsid))  {  return FALSE;  }  stat = pImage->Save(StrBMp,&encoderClsid,NULL);  if (stat != Ok)  {  return FALSE;  }  delete pImage;  return TRUE; }  BOOL CMakePNG::GetEncoderClsid(WCHAR* pFormat,CLSID* pClsid) {  UINT num = 0,size = 0;  ImageCodecInfo* pImageCodecInfo = NULL;  GetImageEncodersSize(&num,&size);  if (size == 0)  {  return FALSE;  }  pImageCodecInfo = (ImageCodecInfo*)(malloc(size));  if (pImageCodecInfo == NULL)  {  return FALSE;  }  GetImageEncoders(num,size,pImageCodecInfo);  BOOL bfound = FALSE;  for (UINT i = 0;!bfound && i < num; i++)  {  if (_wcsicmp(pImageCodecInfo[i].MimeType,pFormat) == 0)  {   *pClsid = pImageCodecInfo[i].Clsid;   bfound = TRUE;  }  }  free(pImageCodecInfo);  return bfound; } 

wstring GetAppPathW() {  wchar_t szExePath[MAX_PATH] = {0};  GetModuleFileNameW(NULL, szExePath, MAX_PATH);  wchar_t *pstr = wcsrchr(szExePath, '//');  memset(pstr + 1, 0, 2);  wstring strAppPath(szExePath);  return strAppPath; }  // 屏幕截圖 CString CDemoDlg::ScreenShot(void) {  CWnd *pDesktop = GetDesktopWindow();  CDC *pDC = pDesktop->GetDC();  CRect rect;  //獲取窗口的大小  pDesktop->GetClientRect(&rect);   //保存到的文件名  CString strFileName(GetAppPathW().c_str());  strFileName += _T("ScreenShot//");  CreateDirectory((LPCTSTR)strFileName,NULL);  CTime t = CTime::GetCurrentTime();  CString tt = t.Format("%Y%m%d_%H%M%S");  strFileName += tt;  strFileName += _T(".PNG");  //保存為PNG  CMakePNG MakePNG;  MakePNG.MakePNG(pDC->m_hDC,rect,strFileName);  ReleaseDC(pDC);  return strFileName; }