注意:转换为ICO后效果不好
源代码:
using System;
using SystemCollectionsGeneric;
using SystemText;
using SystemDrawing;
using SystemDrawingImaging;
using SystemIO;
namespace paomiangege
{
public class ImageConvert
{
private int ICON_W = ;
private int ICON_H = ;
public ImageConvert()
{
}
//fileinpathorigaly picture file pathfileoutpath save filepathindex the ImageFormat you want to convert to
public string Convert(string fileinpath string fileoutpath string index)
{
try
{
Bitmap bitmap = new Bitmap(fileinpath);
index = indexToLower();
switch (index)
{
case jpg: bitmapSave(fileoutpath ImageFormatJpeg); break;
case jpeg: bitmapSave(fileoutpath ImageFormatJpeg); break;
case bmp: bitmapSave(fileoutpath ImageFormatBmp); break;
case png: bitmapSave(fileoutpath ImageFormatPng); break;
case emf: bitmapSave(fileoutpath ImageFormatEmf); break;
case gif: bitmapSave(fileoutpath ImageFormatGif); break;
case wmf: bitmapSave(fileoutpath ImageFormatWmf); break;
case exif: bitmapSave(fileoutpath ImageFormatExif); break;
case tiff:
{
Stream stream = FileCreate(fileoutpath);
bitmapSave(stream ImageFormatTiff);
streamClose();
} break;
case ico:
{
Icon ico;
Stream stream = FileCreate(fileoutpath);
ico = BitmapToIcon(bitmap false);
icoSave(stream); // save the icon
streamClose();
}; break;
default: return Error!;
}
return Success!;
}
catch(Exception ex)
{
return exMessage;
}
}
public string Convert(string fileinpath string fileoutpath string indexint widthint height)
{
if (width <= || height <= )
return error!size illegal!;
try
{
Bitmap mybitmap = new Bitmap(fileinpath);
Bitmap bitmap = new Bitmap(mybitmap width height);
index = indexToLower();
switch (index)
{
case jpg: bitmapSave(fileoutpath ImageFormatJpeg); break;
case jpeg: bitmapSave(fileoutpath ImageFormatJpeg); break;
case bmp: bitmapSave(fileoutpath ImageFormatBmp); break;
case png: bitmapSave(fileoutpath ImageFormatPng); break;
case emf: bitmapSave(fileoutpath ImageFormatEmf); break;
case gif: bitmapSave(fileoutpath ImageFormatGif); break;
case wmf: bitmapSave(fileoutpath ImageFormatWmf); break;
case exif: bitmapSave(fileoutpath ImageFormatExif); break;
case tiff:
{
Stream stream = FileCreate(fileoutpath);
bitmapSave(stream ImageFormatTiff);
streamClose();
} break;
case ico:
{
if (height > || width > )//ico maxsize *
return Error!Size illegal!;
Icon ico;
ICON_H = height;
ICON_W = width;
Stream stream = FileCreate(fileoutpath);
ico = BitmapToIcon(mybitmap true);
icoSave(stream); // save the icon
streamClose();
}; break;
default: return Error!;
}
return Success!;
}
catch (Exception ex)
{
return exMessage;
}
}
private Icon BitmapToIcon(Bitmap obm bool preserve)
{
Bitmap bm;
// if not preserving aspect
if (!preserve) // if not preserving aspect
bm = new Bitmap(obm ICON_W ICON_H); // rescale from original bitmap
// if preserving aspect drop excess significance in least significant direction
else // if preserving aspect
{
Rectangle rc = new Rectangle( ICON_W ICON_H);
if (obmWidth >= obmHeight) // if width least significant
{ // rescale with width based on max icon height
bm = new Bitmap(obm (ICON_H * obmWidth) / obmHeight ICON_H);
rcX = (bmWidth ICON_W) / ; // chop off excess width significance
if (rcX < ) rcX = ;
}
else // if height least significant
{ // rescale with height based on max icon width
bm = new Bitmap(obm ICON_W (ICON_W * obmHeight) / obmWidth);
rcY = (bmHeight ICON_H) / ; // chop off excess height significance
if (rcY < ) rcY = ;
}
bm = bmClone(rc bmPixelFormat); // bitmap for icon rectangle
}
// create icon from bitmap
Icon icon = IconFromHandle(bmGetHicon()); // create icon from bitmap
bmDispose(); // dispose of bitmap
return icon; // return icon
}
}
}
