c#/vb.net powerpoint 文档转换成图片、pdf、svg 等格式文件-凯发线上登陆下载网址

spire.presentation支持丰富的格式转换，例如ppt、pptx格式互转，ppt/pptx转pdf，ppt/pptx转png，ppt/pptx转svg（可缩放矢量图）。下表列出了实现这些格式转换的具体方法及用法。

powerpoint转换为pdf

通过presentatin.savetofile()的方法，我们可以将powerpoint文件转换为ppt、pptx、 ppsx、 pps、 odp、 xps、 pdf格式的文档。这里以转到pdf为例：

//初始化presentation实例
presentation presentation = new presentation();
//加载一个powerpoint文档
presentation.loadfromfile("模板.pptx");
//保存为pdf文档
presentation.savetofile("topdf.pdf", fileformat.pdf);

'初始化presentation实例
dim presentation as new presentation()
'加载一个powerpoint文档
presentation.loadfromfile("模板.pptx")
'保存为pdf文档
presentation.savetofile("topdf.pdf", fileformat.pdf)

powerpoint转换为位图

通过islide.saveasimage()方法，我们可以将特定的幻灯片转换为常见的位图格式，包括png、bmp、jpeg、tiff。这里以转到png为例：

//初始化presentation实例
presentation presentation = new presentation();
//加载一个powerpoint文档
presentation.loadfromfile("模板.pptx");
//遍历powerpoint文档中的幻灯片并保存为png图片
for (int i = 0; i < presentation.slides.count; i  )
{
    image image = presentation.slides[i].saveasimage();
    string filename = string.format("图{0}.png", i);
    image.save(filename, system.drawing.imaging.imageformat.png);
}

'初始化presentation实例
dim presentation as new presentation()
'加载一个powerpoint文档
presentation.loadfromfile("模板.pptx")
'遍历powerpoint文档中的幻灯片并保存为png图片
for i as integer = 0 to presentation.slides.count - 1
	dim image as image = presentation.slides(i).saveasimage()
	dim filename as [string] = [string].format("图{0}.png", i)
	image.save(filename, system.drawing.imaging.imageformat.png)
next

powerpoint转换为矢量图（emf，svg）

powerpoint转emf：

//初始化presentation实例
presentation presentation = new presentation();
//加载一个powerpoint文档
presentation.loadfromfile("模板.pptx");
//遍历powerpoint文档中的幻灯片并保存为emf图片
for (int i = 0; i < presentation.slides.count; i  )
{
    string filename = string.format("result-{0}.emf", i);
    presentation.slides[i].saveasemf(filename);
}

'初始化presentation实例
dim presentation as new presentation()
'加载一个powerpoint文档
presentation.loadfromfile("模板.pptx")
'遍历powerpoint文档中的幻灯片并保存为emf图片
for i as integer = 0 to presentation.slides.count - 1
	dim filename as [string] = [string].format("result-{0}.emf", i)
	presentation.slides(i).saveasemf(filename)
next

powerpoint转svg

//初始化presentation实例
presentation presentation = new presentation();
//加载一个powerpoint文档
presentation.loadfromfile("模板.pptx");
//将powerpoint转换为svg图像并以字节形式存储在列队中
queue svgbytes = presentation.savetosvg();
//获取列队中字节数组生成svg文件
int len = svgbytes.count;
for (int i = 0; i < len; i  )
{
    filestream fs = new filestream(string.format("svg-{0}.svg", i), filemode.create);
    byte[] bytes = svgbytes.dequeue();
    fs.write(bytes, 0, bytes.length);
    presentation.dispose();
}

'初始化presentation实例
dim presentation as new presentation()
'加载一个powerpoint文档
presentation.loadfromfile("模板.pptx")
'将powerpoint转换为svg图像并以字节形式存储在列队中
dim svgbytes as queue(of byte()) = presentation.savetosvg()
'获取列队中字节数组生成svg文件
dim len as integer = svgbytes.count
for i as integer = 0 to len - 1
	dim fs as new filestream(string.format("svg-{0}.svg", i), filemode.create)
	dim bytes as byte() = svgbytes.dequeue()
	fs.write(bytes, 0, bytes.length)
	presentation.dispose()
next