Image::Save保存图片后，为什么保存后的图片大小为0Kb？

[清水迎朝阳]

以下是代码
vc++6.0

image.Save(L"e:\\I_image.tif",&ImageFormatTIFF);

是不是这样用不正确？ 正确的用法如何

[fandh]

gdi+?
你没有初始化吧！

[togoblime]

#include <gdiplus.h>

#pragma comment(lib, "gdiplus.lib")

using namespace Gdiplus;

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
	UINT  num = 0;          // number of image encoders
	UINT  size = 0;         // size of the image encoder array in bytes

	ImageCodecInfo* pImageCodecInfo = NULL;

	GetImageEncodersSize(&num, &size);
	if(size == 0)
		return -1;  // Failure

	pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
	if(pImageCodecInfo == NULL)
		return -1;  // Failure

	GetImageEncoders(num, size, pImageCodecInfo);

	for(UINT j = 0; j < num; ++j)
	{
		if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
		{
			*pClsid = pImageCodecInfo[j].Clsid;
			free(pImageCodecInfo);
			return j;  // Success
		}    
	}

	free(pImageCodecInfo);
	return -1;  // Failure
}

//传入窗口句柄获取其DC来绘图
VOID SaveImage(HWND hwnd)
{
	// Initialize GDI+.
	GdiplusStartupInput gdiplusStartupInput;
	ULONG_PTR gdiplusToken;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	{
		HDC hdc = ::GetDC(hwnd);
		Graphics graphics(hdc);

		// Create an Image object based on a PNG file.
		Image  image(L"E:\\Mosaic.jpg");

		// Draw the image.
		graphics.DrawImage(&image, 10, 10);

		// Construct a Graphics object based on the image.
		Graphics imageGraphics(&image);

		// Alter the image.
		SolidBrush brush(Color(255, 0, 0, 255));
		imageGraphics.FillEllipse(&brush, 20, 30, 80, 50);

		// Draw the altered image.
		graphics.DrawImage(&image, 200, 10);

		// Save the altered image.
		CLSID tifClsid;
		GetEncoderClsid(L"image/tiff", &tifClsid);
		image.Save(L"E:\\Mosaic2.tif", &tifClsid, NULL);
	}

	GdiplusShutdown(gdiplusToken);
}