压缩数据成JPG到内存-windows

无废话，直接上代码

show me the code 头文件

#include <Windows.h>
#include <comdef.h>
#include <gdiplus.h>
#include <map>using namespace std;using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")class DGIWin32Plus
{Bitmap * _bitmap = NULL;//IStream *_stream = NULL;::CLSID _jpgClsid;int _oldw = 320;int _oldh = 240;
protected:int mi_to_memory(Gdiplus::Bitmap *image, void *outbuf, int outbufsize);
public:int   EncodeRGB2Jpeg(char *RGB,int width,int height ,int LineWidth, char *Jpeg, int JpegLen);DGIWin32Plus(void);~DGIWin32Plus(void);};

show me the code cpp文件

#include "DGIWPlus.h"
#include <string.h>
#include <atlconv.h> #define DGIDelete(x) do{if(x!=NULL){delete x;x=NULL;}}while(0)
#define DGIDelete_Array(x) do{if(x!=NULL){ delete[]x;x=NULL;}}while(0)#define DEFINE_GOBJ    Graphics gObj(_Mem)
//#define DEFINE_GOBJHDC Graphics gObjhdc(_Mem)
#define DEFINE_IMG(x) Gdiplus::Bitmap *x;x=NULL#define GET_WIDTH(x) x->GetWidth()
#define GET_HEIGHT(x) x->GetHeight()
#define UNDEFINE_IMG(x) DGIDelete(x)static int GetEncoderClsid( const WCHAR *format, CLSID *pClsid )
{UINT num = 0, size = 0;Gdiplus::ImageCodecInfo *pImageCodecInfo = NULL; Gdiplus::GetImageEncodersSize( &num, &size );if( size == 0 ){return -1;}pImageCodecInfo = (Gdiplus::ImageCodecInfo*) malloc( size );Gdiplus::GetImageEncoders( num, size, pImageCodecInfo );for( UINT i = 0; i < num; ++ i ){if( wcscmp( pImageCodecInfo[i].MimeType, format ) == 0 ){*pClsid = pImageCodecInfo[i].Clsid;free( pImageCodecInfo );return i;}}free( pImageCodecInfo );return -1;
}static bool mem_to_global( const void *buf, size_t size, HGLOBAL global )
{void *dest = ::GlobalLock( global );if( dest == NULL ){return false;}std::memcpy( dest, buf, size );::GlobalUnlock( global );return true;
}static int stream_to_mem( IStream *stream, void *outbuf, int outbufsize )
{ULARGE_INTEGER ulnSize;LARGE_INTEGER lnOffset;lnOffset.QuadPart = 0;/* get the stream size */if( stream->Seek( lnOffset, STREAM_SEEK_END, &ulnSize ) != S_OK ){return -1;}if( stream->Seek( lnOffset, STREAM_SEEK_SET, NULL ) != S_OK ){return -1;}if (ulnSize.QuadPart > outbufsize)ulnSize.QuadPart = outbufsize;/* read it *///*outbuf = malloc( (size_t)ulnSize.QuadPart );//*size = (size_t) ulnSize.QuadPart;ULONG bytesRead;if( stream->Read( outbuf, (ULONG)ulnSize.QuadPart, &bytesRead ) != S_OK ){//free( *outbuf );return -1;}return bytesRead;
}static Gdiplus::Bitmap *mi_from_memory( const void *buf, size_t size )
{IStream *stream = NULL;HGLOBAL global = ::GlobalAlloc( GMEM_MOVEABLE, size );if( global == NULL ){return NULL;}/* copy the buf content to the HGLOBAL */if( !mem_to_global( buf, size, global ) ){::GlobalFree( global );return NULL;}/* get the IStream from the global object */if( ::CreateStreamOnHGlobal( global, TRUE, &stream ) != S_OK ){::GlobalFree( global );return NULL;}/* create the image from the stream */Gdiplus::Bitmap *image = Gdiplus::Bitmap::FromStream( stream );stream->Release();/* i suppose when the reference count for stream is 0, it will GlobalFree automatically. The Image maintain the object also.*/    return image;
}int DGIWin32Plus::mi_to_memory( Gdiplus::Bitmap *image, void *outbuf, int outbufsize )
{IStream *stream = NULL;if (::CreateStreamOnHGlobal(NULL, TRUE, &stream) != S_OK){return -1;}/* save the image to stream */Gdiplus::Status save_s = image->Save( stream, &_jpgClsid );if( save_s != Gdiplus::Ok ){stream->Release();return -1;}/* read the stream to buffer */int ret = stream_to_mem(stream, outbuf, outbufsize);stream->Release();return ret;}static GdiplusStartupInput m_gdiplusStartupInput ;
static ULONG_PTR m_gdiplusToken;
void StartDGIWPlus()
{GdiplusStartup(&m_gdiplusToken, &m_gdiplusStartupInput, NULL); }
void EndDGIPlus()
{GdiplusShutdown(m_gdiplusToken);
}DGIWin32Plus::DGIWin32Plus(void)
{StartDGIWPlus();//::CLSID jpgClsid;GetEncoderClsid(L"image/jpeg", &_jpgClsid);
}DGIWin32Plus::~DGIWin32Plus(void)
{if (_bitmap != NULL)delete _bitmap;/*if(_stream !=NULL)_stream->Release();*/EndDGIPlus();
}int   DGIWin32Plus::EncodeRGB2Jpeg(char *RGB,int width,int height ,int lineWidth, char *Jpeg, int JpegLen)
{if (width != _oldw || height != _oldh){_oldw = width;_oldh = height;}if (_bitmap != NULL){delete _bitmap;_bitmap = NULL;}_bitmap = new Bitmap(width, height, lineWidth, PixelFormat24bppRGB, (BYTE*)RGB);if (_bitmap == NULL)return -1;//size_t size;int ret = mi_to_memory(_bitmap, (void*)Jpeg, JpegLen);//delete bitmap;return ret;
}

各位读者直接调用类就行，数据存磁盘就再写个存文件就好

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压缩数据成JPG到内存-windows

show me the code 头文件

show me the code cpp文件

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