Opencv3.0如何在MFC中显示图片
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本文环境为VS2015+Opencv3.1
首先必须需要cvvImage.h和cvvImage.cpp文件。可以直接百度，都可以找到，分别添加到头文件和源文件中。
在MFCDoc.h文件中包含#include"CvvImage.h"文件。注意在public中添加图片数据类型为CvvImage类型。
在使用DrawToHDC函数是会遇到LPRTSTR到const char*类型转换。
LPCTSTR pszA = ...CStringA sB(pszA);const char* pszC = sB;char* pszD = const_cast<char*>(pszC);
CvvImage.h
#pragma once//#pragma once #ifndef CVVIMAGE_CLASS_DEF #define CVVIMAGE_CLASS_DEF #include <opencv2\highgui\highgui.hpp> class CvvImage { public: CvvImage(); virtual ~CvvImage(); virtual bool Create( int width, int height, int bits_per_pixel, int image_origin = 0 ); virtual bool Load( const char* filename, int desired_color = 1 ); virtual bool LoadRect( const char* filename, int desired_color, CvRect r ); #if defined WIN32 || defined _WIN32 virtual bool LoadRect( const char* filename,int desired_color, RECT r ) { return LoadRect( filename, desired_color, cvRect( r.left, r.top, r.right - r.left, r.bottom - r.top )); } #endif virtual bool Save( const char* filename ); virtual void CopyOf( CvvImage& image, int desired_color = -1 ); virtual void CopyOf( IplImage* img, int desired_color = -1 ); IplImage* GetImage() { return m_img; }; virtual void Destroy(void); int Width() { return !m_img ? 0 : !m_img->roi ? m_img->width : m_img->roi->width; }; int Height() { return !m_img ? 0 : !m_img->roi ? m_img->height : m_img->roi->height;}; int Bpp() { return m_img ? (m_img->depth & 255)*m_img->nChannels : 0; }; virtual void Fill( int color ); virtual void Show( const char* window ); #if defined WIN32 || defined _WIN32 virtual void Show( HDC dc, int x, int y, int width, int height, int from_x = 0, int from_y = 0 ); virtual void DrawToHDC( HDC hDCDst, RECT* pDstRect ); virtual void DrawToHDC( HDC hDCDst, CvRect pDstRect ); #endif protected: IplImage* m_img;};typedef CvvImage CImage;#endifCvvImage.cpp
/////////////////////////////////////////////////////////////////////////////////////////////////////CvvImage.cpp#include "StdAfx.h" #include "CvvImage.h"///////////////////////////////////////////////////////////////////////////////////////////////////CV_INLINE RECT NormalizeRect( RECT r );CV_INLINE RECT NormalizeRect( RECT r ){ int t; if( r.left > r.right ) { t = r.left; r.left = r.right; r.right = t; } if( r.top > r.bottom ) { t = r.top; r.top = r.bottom; r.bottom = t; } return r;}CV_INLINE CvRect RectToCvRect( RECT sr );CV_INLINE CvRect RectToCvRect( RECT sr ){ sr = NormalizeRect( sr ); return cvRect( sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top );}CV_INLINE RECT CvRectToRect( CvRect sr );CV_INLINE RECT CvRectToRect( CvRect sr ){ RECT dr; dr.left = sr.x; dr.top = sr.y; dr.right = sr.x + sr.width; dr.bottom = sr.y + sr.height; return dr;}CV_INLINE IplROI RectToROI( RECT r );CV_INLINE IplROI RectToROI( RECT r ){ IplROI roi; r = NormalizeRect( r ); roi.xOffset = r.left; roi.yOffset = r.top; roi.width = r.right - r.left; roi.height = r.bottom - r.top; roi.coi = 0; return roi;}void FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin ){ assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32)); BITMAPINFOHEADER* bmih = &(bmi->bmiHeader); memset( bmih, 0, sizeof(*bmih)); bmih->biSize = sizeof(BITMAPINFOHEADER); bmih->biWidth = width; bmih->biHeight = origin ? abs(height) : -abs(height); bmih->biPlanes = 1; bmih->biBitCount = (unsigned short)bpp; bmih->biCompression = BI_RGB; if( bpp == 8 ) { RGBQUAD* palette = bmi->bmiColors; int i; for( i = 0; i < 256; i++ ) { palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i; palette[i].rgbReserved = 0; } }}CvvImage::CvvImage(){ m_img = 0;}void CvvImage::Destroy(){ cvReleaseImage( &m_img );}CvvImage::~CvvImage(){ Destroy();}bool CvvImage::Create( int w, int h, int bpp, int origin ){ const unsigned max_img_size = 10000; if( (bpp != 8 && bpp != 24 && bpp != 32) || (unsigned)w >= max_img_size || (unsigned)h >= max_img_size || (origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL)) { assert(0); // most probably, it is a programming error return false; } if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h ) { if( m_img && m_img->nSize == sizeof(IplImage)) Destroy(); m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 ); } if( m_img ) m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL; return m_img != 0;}void CvvImage::CopyOf( CvvImage& image, int desired_color ){ IplImage* img = image.GetImage(); if( img ) { CopyOf( img, desired_color ); }}#define HG_IS_IMAGE(img) \ ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && \ ((IplImage*)img)->imageData != 0)void CvvImage::CopyOf( IplImage* img, int desired_color ){ if( HG_IS_IMAGE(img) ) { int color = desired_color; CvSize size = cvGetSize( img ); if( color < 0 ) color = img->nChannels > 1; if( Create( size.width, size.height, (!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8, img->origin )) { cvConvertImage( img, m_img, 0 ); } }}bool CvvImage::Load( const char* filename, int desired_color ){ IplImage* img = cvLoadImage( filename, desired_color ); if( !img ) return false; CopyOf( img, desired_color ); cvReleaseImage( &img ); return true;}bool CvvImage::LoadRect( const char* filename, int desired_color, CvRect r ){ if( r.width < 0 || r.height < 0 ) return false; IplImage* img = cvLoadImage( filename, desired_color ); if( !img ) return false; if( r.width == 0 || r.height == 0 ) { r.width = img->width; r.height = img->height; r.x = r.y = 0; } if( r.x > img->width || r.y > img->height || r.x + r.width < 0 || r.y + r.height < 0 ) { cvReleaseImage( &img ); return false; } if( r.x < 0 ) { r.width += r.x; r.x = 0; } if( r.y < 0 ) { r.height += r.y; r.y = 0; } if( r.x + r.width > img->width ) r.width = img->width - r.x; if( r.y + r.height > img->height ) r.height = img->height - r.y; cvSetImageROI( img, r ); CopyOf( img, desired_color ); cvReleaseImage( &img ); return true;}bool CvvImage::Save( const char* filename ){ if( !m_img ) return false; cvSaveImage( filename, m_img ); return true;}void CvvImage::Show( const char* window ){ if( m_img ) cvShowImage( window, m_img );}void CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y ){ if( m_img && m_img->depth == IPL_DEPTH_8U ) { uchar buffer[sizeof(BITMAPINFOHEADER) + 1024]; BITMAPINFO* bmi = (BITMAPINFO*)buffer; int bmp_w = m_img->width, bmp_h = m_img->height; FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin ); from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 ); from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 ); int sw = MAX( MIN( bmp_w - from_x, w ), 0 ); int sh = MAX( MIN( bmp_h - from_y, h ), 0 ); SetDIBitsToDevice( dc, x, y, sw, sh, from_x, from_y, from_y, sh, m_img->imageData + from_y*m_img->widthStep, bmi, DIB_RGB_COLORS ); }}void CvvImage::DrawToHDC( HDC hDCDst, RECT* pDstRect ) { if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData ) { uchar buffer[sizeof(BITMAPINFOHEADER) + 1024]; BITMAPINFO* bmi = (BITMAPINFO*)buffer; int bmp_w = m_img->width, bmp_h = m_img->height; CvRect roi = cvGetImageROI( m_img ); CvRect dst = RectToCvRect( *pDstRect ); if( roi.width == dst.width && roi.height == dst.height ) { Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y ); return; } if( roi.width > dst.width ) { SetStretchBltMode( hDCDst, // handle to device context HALFTONE ); } else { SetStretchBltMode( hDCDst, // handle to device context COLORONCOLOR ); } FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin ); ::StretchDIBits(hDCDst,dst.x, dst.y, dst.width, dst.height,roi.x, roi.y, roi.width, roi.height,\ m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY ); }}void CvvImage::DrawToHDC( HDC hDCDst, CvRect pDstRect ){ RECT rDest=CvRectToRect(pDstRect); DrawToHDC(hDCDst,&rDest);}void CvvImage::Fill( int color ){ cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );}参考网站：http://stackoverflow.com/questions/9782106/c-lpctstr-to-charcontrolhttp://stackoverflow.com/questions/12891307/using-opencv-2-4-loading-an-image-in-mfc-sdi-view-or-control
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