MFC点击按钮打开文件选择对话框并获取图片
来源：互联网 发布：java一行输出多个变量 编辑：程序博客网 时间：2024/05/16 15:17
1.环境
Visual Studio 2012
Opencv 2.4.13
Unicode字符集
2.文件对话框CFileDialog
CFileDialog::CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDefExt = NULL, LPCTSTR lpszFileName = NULL, DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, LPCTSTR lpszFilter = NULL, CWnd* pParentWnd = NULL );
参数意义如下：
bOpenFileDialog 为TRUE则显示打开对话框，为FALSE则显示保存对话文件对话框。
lpszDefExt 指定默认的文件扩展名。
lpszFileName 指定默认的文件名。
dwFlags 指明一些特定风格。
lpszFilter 是最重要的一个参数，它指明可供选择的文件类型和相应的扩展名。参数格式如：
"Chart Files (*.xlc)|*.xlc|Worksheet Files (*.xls)|*.xls|Data Files (*.xlc;*.xls)|*.xlc; *.xls|All Files (*.*)|*.*||";文件类型说明和扩展名间用 | 分隔，同种类型文件的扩展名间可以用 ; 分割，每种文件类型间用 | 分隔，末尾用 || 指明。
void CFoxitDlg::OnBtn3() { // TODO: Add your control notification handler code here CString filter; filter="(*.jpg)|所有文件(*.*)||"; CFileDialog dlg(TRUE,NULL,NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,filter,NULL); if(dlg.DoModal()==IDOK) { CString filepathname; filepathname=dlg.GetPathName(); MessageBox(str); } }3.CString转char*
在网上看了很多的教程，有用Getbuffer()的，有用strcpy的，但是在我的工程中都不起作用，后来在这位老兄的博客里http://blog.csdn.net/flydream0/article/details/8543525/发现，如果工程使用的是Unicode字符集的话，那么上述方法都不起作用，只有一种方法，就是使用WideCharToMultiByte函数。
CString fileinfo = filepathname;int len =WideCharToMultiByte(CP_ACP,0,fileinfo,-1,NULL,0,NULL,NULL); char *path =new char[len +1]; WideCharToMultiByte(CP_ACP,0,fileinfo,-1,path,len,NULL,NULL );
4.加载图片并显示大MFC对话框的Pic Control控件内
if(image) cvReleaseImage(&image); image = cvLoadImage(path,1); //显示图片 delete[] path; DrawPicToHDC(image, IDC_PIC1);
所用到的代码虽然看似只有这几行，但是DrawPicToHDC()函数背后却有两个文件支持，一个是CvvImage.h一个是CvvImage.cpp，这两个函数支持了opencv向MFC的控件绘制图片，这两个文件的源代码如下，可直接拷贝并导入工程，Opencv的环境根据具体存放位置自己配置。
CvvImage.h
#include <opencv2\opencv.hpp>#include "stdafx.h"using namespace cv;#pragma once#ifndef CVVIMAGE_CLASS_DEF#define CVVIMAGE_CLASS_DEF#include <opencv2\opencv.hpp>using namespace cv;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 );#endifprotected: IplImage* m_img;};//typedef CvvImage CImage;namespace cv{ typedef CvvImage CImage;}#endifCvvImage.cpp
#include "stdafx.h"#include "CvvImage.h"//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////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::Fill( int color ){ cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );}5.运行效果
点击打开图像，弹出文件选择对话框
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