我利用下列代码实现将一个内存文件CMemFile(bmp)转为jpeg格式,并将其写入一个文件(CFile),编译倒是通过了,但结果未能将信息写入CFile文件,CFile文件为空。下面是我的代码,请高手不吝赐教!
BOOL CGoClientDlg::MBmpToMImage(CMemFile& cbfBmp, CFile& cbfImage)
{
//MessageBox("Hello!");
int iBmpSize = cbfBmp.GetLength();
if (iBmpSize!=0) MessageBox("Right");
else MessageBox("False");
HGLOBAL hMemBmp = GlobalAlloc(GMEM_FIXED, iBmpSize);
if (hMemBmp == NULL) return FALSE;
IStream* pStmBmp = NULL;
CreateStreamOnHGlobal(hMemBmp, FALSE, &pStmBmp);
if (pStmBmp == NULL)
{
GlobalFree(hMemBmp);
return FALSE;
}
BYTE* pbyBmp = (BYTE *)GlobalLock(hMemBmp);
cbfBmp.SeekToBegin();
cbfBmp.Read(pbyBmp, iBmpSize);
Image* imImage = NULL;
imImage = Image::FromStream(pStmBmp, FALSE);
if (imImage == NULL)
{
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
return FALSE;
}
// USES_CONVERSION;
CLSID clImageClsid;
//GetImageCLSID(A2W("image/"+strType.GetBuffer(0)), &clImageClsid);
GetCodecClsid(L"image/jpeg", &clImageClsid);
HGLOBAL hMemImage = GlobalAlloc(GMEM_MOVEABLE, 0);
if (hMemImage == NULL)
{
pStmBmp->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
if (imImage != NULL) delete imImage;
return FALSE;
}
IStream* pStmImage = NULL;
CreateStreamOnHGlobal(hMemImage, TRUE, &pStmImage);
if (pStmImage == NULL)
{
pStmBmp->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
if (imImage != NULL) delete imImage;
return FALSE;
}
imImage->Save(pStmImage, &clImageClsid);
if (pStmImage == NULL)
{
pStmBmp->Release();
pStmImage->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
if (imImage != NULL) delete imImage;
return FALSE;
}
LARGE_INTEGER liBegin = {0};
pStmImage->Seek(liBegin, STREAM_SEEK_SET, NULL);
BYTE* pbyImage = (BYTE *)GlobalLock(hMemImage);
cbfImage.SeekToBegin();
cbfImage.Write(pbyImage, GlobalSize(hMemImage));
if (imImage != NULL) delete imImage;
pStmBmp->Release();
pStmImage->Release();
GlobalUnlock(hMemBmp);
GlobalUnlock(hMemImage);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
return TRUE;
}
BOOL CGoClientDlg::MBmpToMImage(CMemFile& cbfBmp, CFile& cbfImage)
{
//MessageBox("Hello!");
int iBmpSize = cbfBmp.GetLength();
if (iBmpSize!=0) MessageBox("Right");
else MessageBox("False");
HGLOBAL hMemBmp = GlobalAlloc(GMEM_FIXED, iBmpSize);
if (hMemBmp == NULL) return FALSE;
IStream* pStmBmp = NULL;
CreateStreamOnHGlobal(hMemBmp, FALSE, &pStmBmp);
if (pStmBmp == NULL)
{
GlobalFree(hMemBmp);
return FALSE;
}
BYTE* pbyBmp = (BYTE *)GlobalLock(hMemBmp);
cbfBmp.SeekToBegin();
cbfBmp.Read(pbyBmp, iBmpSize);
Image* imImage = NULL;
imImage = Image::FromStream(pStmBmp, FALSE);
if (imImage == NULL)
{
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
return FALSE;
}
// USES_CONVERSION;
CLSID clImageClsid;
//GetImageCLSID(A2W("image/"+strType.GetBuffer(0)), &clImageClsid);
GetCodecClsid(L"image/jpeg", &clImageClsid);
HGLOBAL hMemImage = GlobalAlloc(GMEM_MOVEABLE, 0);
if (hMemImage == NULL)
{
pStmBmp->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
if (imImage != NULL) delete imImage;
return FALSE;
}
IStream* pStmImage = NULL;
CreateStreamOnHGlobal(hMemImage, TRUE, &pStmImage);
if (pStmImage == NULL)
{
pStmBmp->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
if (imImage != NULL) delete imImage;
return FALSE;
}
imImage->Save(pStmImage, &clImageClsid);
if (pStmImage == NULL)
{
pStmBmp->Release();
pStmImage->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
if (imImage != NULL) delete imImage;
return FALSE;
}
LARGE_INTEGER liBegin = {0};
pStmImage->Seek(liBegin, STREAM_SEEK_SET, NULL);
BYTE* pbyImage = (BYTE *)GlobalLock(hMemImage);
cbfImage.SeekToBegin();
cbfImage.Write(pbyImage, GlobalSize(hMemImage));
if (imImage != NULL) delete imImage;
pStmBmp->Release();
pStmImage->Release();
GlobalUnlock(hMemBmp);
GlobalUnlock(hMemImage);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
return TRUE;
}
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http://www.vckbase.com/document/viewdoc/?id=1177
使用GDI+在内存中转换图片类型肯定能帮到你的
#define ULONG_PTR unsigned long*
#include "GdiPlus.h"
using namespace Gdiplus;
#pragma comment(lib, "gdiplus.lib")
#endif在类的头文件中定义,以下成员变量,用来初始化GDI+的使用和结束使用。 GdiplusStartupInput m_gdiplusStartupInput;
ULONG_PTR m_gdiplusToken;然后在OnCreate()函数中加入初始化GDI+的函数: GdiplusStartup(&m_gdiplusToken, &m_gdiplusStartupInput, NULL); 在OnDestroy()函数中加入结束GDI+使用的函数: GdiplusShutdown(m_gdiplusToken);接着,定义转换函数:BOOL MBmpToMImage(CMemFile& cbfBmp, CMemFile& cbfImage, CString strType)其中: CMemFile& cbfBmp表示原位图文件;
CMemFile& cbfImage表示转换后的图形文件;
CString strType表示转换的图片类型。该函数中主要的处理为以下几步:
将原位图文件转换为IStream
定义Image类实例,并使用第1步获得的IStream初始化
获取转换的图片类型的CLSID
将Image以转换的图片类型保存到IStream中
将IStream转换为CMemFile内存文件(也可为CFile)
详细代码如下: BOOL MBmpToMImage(CMemFile& cbfBmp, CMemFile& cbfImage, CString strType)
{
int iBmpSize = cbfBmp.GetLength();
HGLOBAL hMemBmp = GlobalAlloc(GMEM_FIXED, iBmpSize);
if (hMemBmp == NULL) return FALSE;
IStream* pStmBmp = NULL;
CreateStreamOnHGlobal(hMemBmp, FALSE, &pStmBmp);
if (pStmBmp == NULL)
{
GlobalFree(hMemBmp);
return FALSE;
}
BYTE* pbyBmp = (BYTE *)GlobalLock(hMemBmp);
cbfBmp.SeekToBegin();
cbfBmp.Read(pbyBmp, iBmpSize);
Image* imImage = NULL;
imImage = Image::FromStream(pStmBmp, FALSE);
if (imImage == NULL)
{
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
return FALSE;
}
USES_CONVERSION;
CLSID clImageClsid;
GetImageCLSID(A2W("image/"+strType.GetBuffer(0)), &clImageClsid);
HGLOBAL hMemImage = GlobalAlloc(GMEM_MOVEABLE, 0);
if (hMemImage == NULL)
{
pStmBmp->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
if (imImage != NULL) delete imImage;
return FALSE;
}
IStream* pStmImage = NULL;
CreateStreamOnHGlobal(hMemImage, TRUE, &pStmImage);
if (pStmImage == NULL)
{
pStmBmp->Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
if (imImage != NULL) delete imImage
return FALSE;
}
imImage->Save(pStmImage, &clJpgClsid);
if (pStmImage == NULL)
{
pStmBmp->Release();
pStmImage>Release();
GlobalUnlock(hMemBmp);
GlobalFree(hMemBmp);
GlobalFree(hMemImage;
if (imImage != NULL) delete imImage;
return FALSE;
}
LARGE_INTEGER liBegin = {0};
pStmImage->Seek(liBegin, STREAM_SEEK_SET, NULL);
BYTE* pbyImage = (BYTE *)GlobalLock(hMemImage);
cbfImage.SeekToBegin();
cbfImage.Write(pbyImage, GlobalSize(hMemImage));
if (imImage != NULL) delete imImage;
pStmBmp->Release();
pStmImage->Release();
GlobalUnlock(hMemBmp);
GlobalUnlock(hMemImage);
GlobalFree(hMemBmp);
GlobalFree(hMemImage);
return TRUE;
}
//保存图像
CLSID jpgClsid;
GetEncoderClsid(L"image/jpeg", &jpgClsid);
newBitmap->Save(L"c:\\01.jpg",&jpgClsid,NULL);/******************************************************/
/*CLSID 获取函数定义 */
/******************************************************/
BOOL GetEncoderClsid(const WCHAR* format, CLSID* pCLSID)
{
UINT num = 0;
UINT size = 0;ImageCodecInfo* pImageCodecInfo = NULL;
GetImageEncodersSize(&num, &size);
if(size == 0){
return FALSE;
}
pImageCodecInfo = (ImageCodecInfo *)(malloc(size));
if(pImageCodecInfo == NULL)
return FALSE;
GetImageEncoders(num, size, pImageCodecInfo); // Find for the support of format for image in the windows
for(UINT i = 0; i < num; ++i)
{
//MimeType: Depiction for the program image
if( wcscmp(pImageCodecInfo[i].MimeType, format) == 0)
{
*pCLSID = pImageCodecInfo[i].Clsid;
free(pImageCodecInfo);
return TRUE;
}
}
free(pImageCodecInfo);
return FALSE;
}