WinCE中用IImage如何旋转JPG图片

要包括头文件

#include <INITGUID.h>
#include <imaging.h>

 

//JPG图片旋转功能
void CImagingDemoDlg::OnBnClickedRotate()
{
// TODO: 在此添加控件通知处理程序代码
HRESULT hr ; //返回结果
IImagingFactory * pImagingFactory =NULL; //Image工厂接口对象
IImage * pImage = NULL,* pNewImage = NULL; //Image接口对象;新的IImage图像

IBitmapImage * pbmpImg = NULL,* pNewbmpImg = NULL; //GIF/PNG/JPG图像;旋转后的图像
IBasicBitmapOps * pbmpOp = NULL; //旋转操作
ImageInfo imageInfo;
FLOAT m_RAngle = 90;

LPCTSTR szFileName = L"//Saturn&Jupiter.gif"; //图象文件notice.png//Windows Embedded.jpg//test.jpg

//初始化COM环境
if (FAILED(hr = CoInitializeEx(NULL, COINIT_MULTITHREADED)))
{
TRACE(L"COINIT_MULTITHREADED ERROR");
return;
}

//得到Image工厂接口对象
hr = CoCreateInstance(CLSID_ImagingFactory,
NULL,
CLSCTX_INPROC_SERVER,
IID_IImagingFactory,
(void**) &pImagingFactory);

if (FAILED(hr))
{
TRACE(L"IMAGE FACTORY CREATED ERROR");
goto finish;
}

//加载图象文件到IImage接口对象中
hr = pImagingFactory->CreateImageFromFile(szFileName,&pImage);

if (FAILED(hr))
{
TRACE(L"IMAGE LOAD ERROR");
goto finish;
}

//获得原图片的基本信息
pImage-> GetImageInfo(&imageInfo);
//加载图像文件到IImage接口对象中
pImagingFactory->CreateBitmapFromImage(pImage,imageInfo.Width,imageInfo.Height,imageInfo.PixelFormat,InterpolationHintDefault,&pbmpImg);
//查询某个组件是否支持某个特定的接口,若支持则QueryInterface则返回一个指向特定接口的指针;若不支持则返回一个错误代码
hr = pbmpImg->QueryInterface(IID_IBasicBitmapOps,(void **)&pbmpOp);
//顺时针旋转
pbmpOp->Rotate(m_RAngle,InterpolationHintDefault,&pNewbmpImg);
//IBitmapImage对象->IImage对象
hr = pNewbmpImg->QueryInterface(IID_IImage,(void **)&pNewImage);

//开始绘制图象
//得到设备环境
CDC *pDC =GetDC();

//定义绘制尺寸
RECT rect;
GetClientRect(&rect);

//绘制图片
//pImage->Draw(pDC->m_hDC, &rect, NULL);
pNewImage->Draw(pDC->m_hDC, &rect, NULL);

//释放设备环境
ReleaseDC(pDC);

finish:
//释放IImage接口对象
if (pImage)
pImage->Release();

//释放IImagingFactory接口对象
if (pImagingFactory)
pImagingFactory->Release();

//释放程序占用的COM资源
CoUninitialize();

}