用OpenCV显示一幅图像到指定的窗体

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找了好久，没找到相应函数，于是参照cv::imshow的源代码，搞出来一份。
（OpenCV不简洁明了，学习的成本大于2天我就觉得太不值得了，下周准备试试CxImage）

#include "highgui.h"

#ifdef _DEBUG
     #pragma comment( lib, "opencv_core220d.lib" )
     #pragma comment( lib, "opencv_highgui220d.lib" )
#else
     #pragma comment( lib, "opencv_core220.lib" )
     #pragma comment( lib, "opencv_highgui220.lib" )
#endif

// 此代码是从OpenCV-2.2.0 中一点点扣出来的

bool MyShowImage( const cv::Mat& img, HDC hdc, const RECT& rect )

{

CvMat _img = img;

const CvArr* arr = &_img;

CvMat stub;

CvMat* image = cvGetMat( arr, &stub );

// 构造BITMAPINFO头

SIZE size = { image->width, image->height };

int channels = 3;

BITMAPINFO binfo;

memset( &binfo, 0, sizeof(binfo));

BITMAPINFOHEADER& bmih = binfo.bmiHeader;

bmih.biSize = sizeof(BITMAPINFOHEADER);

bmih.biWidth = size.cx;

bmih.biHeight = abs(size.cy);

bmih.biPlanes = 1;

bmih.biBitCount = (unsigned short)(channels*8);

bmih.biCompression = BI_RGB;

void* dst_ptr = 0;

HBITMAP hb = CreateDIBSection( hdc, &binfo, DIB_RGB_COLORS, &dst_ptr, 0, 0 );

HDC windowdc = ::CreateCompatibleDC( hdc );

SelectObject( windowdc, hb );

CvMat dst;

cvInitMatHeader( &dst, size.cy, size.cx, CV_8UC3, dst_ptr, (size.cx*channels + 3)&-4 );

int origin = ((IplImage*)arr)->origin;

cvConvertImage( image, &dst, origin==0 ? CV_CVTIMG_FLIP : 0 );

// 显示

SetStretchBltMode( hdc, COLORONCOLOR );

//BitBlt( hdc, 0, 0, size.cx, size.cy, windowdc, 0, 0, SRCCOPY );

StretchBlt( hdc, 0, 0, rect.right-rect.left, rect.bottom-rect.top, windowdc, 0, 0, size.cx, size.cy, SRCCOPY );

return 0;

}

int main()

{

const char* imagename = "1.tif";

cv::Mat img = cv::imread( imagename );

if( img.empty() || !img.data )

{

fprintf(stderr, "Can not load image %s\n", imagename);

return -1;

}

//cv::namedWindow("image", CV_WINDOW_AUTOSIZE);

//cv::imshow("image", img);

//cv::waitKey();

// 随便弄个窗体，然后显示上去

HWND hwnd = ::GetConsoleWindow();

RECT rect;

GetWindowRect( hwnd, &rect );

MyShowImage( img, ::GetWindowDC(hwnd), rect );

return 0;

}

# http://www.antigrain.com/2011-02-23 19:47wetwoo

有时间看看这个：
http://www.antigrain.com/