快速修改JPEG文件的旋转角度（通过修改exif信息）

来源：互联网发布：苹果维修预约软件编辑：程序博客网时间：2024/05/21 06:54

首先需要引入头文件和lib库

#include "Wincodec.h"
#pragma comment(lib, "Windowscodecs.lib")

CString str = L"E://a.jpg";

IWICImagingFactory *pFactory = NULL;
IWICBitmapDecoder *pDecoder = NULL;
IWICBitmapFrameDecode *pFrameDecode = NULL;
IWICMetadataQueryReader *pQueryReader = NULL;

PROPVARIANT value;

CoInitialize(NULL);

PropVariantInit(&value);

HRESULT hr = CoCreateInstance(
CLSID_WICImagingFactory,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWICImagingFactory,
(LPVOID*)&pFactory);

// Create the decoder
if (SUCCEEDED(hr))
{
hr = pFactory->CreateDecoderFromFilename(
str,
NULL,
GENERIC_READ|GENERIC_WRITE,
WICMETADATACACHEOPTION_FORCE_DWORD,
&pDecoder);
}

// Get a single frame from the image
if (SUCCEEDED(hr))
{
hr = pDecoder->GetFrame(0, //JPEG has only one frame.
&pFrameDecode);
}

IWICFastMetadataEncoder *pFastEncoder = NULL;
hr = pFactory->CreateFastMetadataEncoderFromFrameDecode(pFrameDecode, &pFastEncoder);
IWICMetadataQueryWriter *pXMPWriter = NULL;
if(SUCCEEDED(hr))
{
hr = pFastEncoder->GetMetadataQueryWriter(&pXMPWriter);
}
if (SUCCEEDED(hr))
{
PROPVARIANT value;
PropVariantInit(&value);

value.vt = VT_UI2; //参数类型
value.uiVal = 5; //角度

hr = pXMPWriter->SetMetadataByName(L"/app1/ifd/{ushort=274}", &value);

PropVariantClear(&value);
}

hr = pFastEncoder->Commit();
pXMPWriter->Release();
pFastEncoder->Release();
pFrameDecode->Release();
pDecoder->Release();

pFactory->Release();