我一直在从事一个需要以“kiosk”演示模式显示 PPT 文件的项目。 在 PPTX 文件中,我可以像 zip 文件一样提取它并重写 presProps.xml,其中包含诸如“p:showPr useTimings=”0”p:present”之类的属性,并且我可以通过重写“p:present”来更改模式到“p:kiosk”。 我刚刚发现我可以使用 apache-poi OPCPackage 来做到这一点。 (例如How do I edit the presProps.xml file with ApachePoi)
但是,在 PPT 文件中,我无法像上面那样执行此操作。有什么办法可以改变PPT文件的演示模式吗? 或者我可以使用 apache-poi 将 PPT 文件转换为 PPTX 文件,以便上面的解决方案可以工作吗?
谢谢。
最佳答案
*.ppt
文件是以二进制文件格式存储的 PowerPoint
文件。这就是org.apache.poi.hslf是为.入口点是 HSLFSlideShow .
所有 Office 二进制格式都有一个共同点,即它们都是描述文档的Record
数据记录流。对于 PowerPoint
,规范位于:[MS-PPT]: PowerPoint (.ppt) Binary File Format 。
对于您的要求,有 DocumentContainer有一个可选的SlideShowDocInfoAtom放。可以设置F - fKioskMode(1 位)
来设置 kiosk 模式。
DocumentContainer
可以通过 HSLFSlideShow.getDocumentRecord 获取使用apache poi
。但随后 apache poi
的支持结束了,因为 Record
SlideShowDocInfoAtom
到目前为止尚未实现。
但是使用扩展了 RecordAtom
的自己的类 SlideShowDocInfoAtom
我们可以实现这一点。
示例:
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.IOException;
import org.apache.poi.hslf.usermodel.*;
import org.apache.poi.hslf.record.Record;
import org.apache.poi.hslf.record.RecordAtom;
public class HSLFSlideShowToKioskMode {
// not really necessary, only for debug actions
private static void hexDumpRecord(Record record) throws Exception {
ByteArrayOutputStream out = new ByteArrayOutputStream();
record.writeOut(out);
out.flush();
byte[] data = out.toByteArray();
out.close();
String hexDump = new java.math.BigInteger(data).toString(16);
System.out.println(hexDump);
}
// method for get/set SlideShowDocInfoAtom
private static SlideShowDocInfoAtom getSlideShowDocInfoAtom(HSLFSlideShow slideshow) throws Exception {
SlideShowDocInfoAtom slideShowDocInfoAtomRecord = null;
Record record = slideshow.getDocumentRecord().findFirstOfType(1025);
System.out.println(record.toString() + " type:" + record.getRecordType());
hexDumpRecord(record);
if (record != null) { // we must not create new SlideShowDocInfoAtom
// get present data
ByteArrayOutputStream out = new ByteArrayOutputStream();
record.writeOut(out);
out.flush();
byte[] data = out.toByteArray();
out.close();
// create new SlideShowDocInfoAtom from data
slideShowDocInfoAtomRecord = new SlideShowDocInfoAtom(data);
// replace old record with new SlideShowDocInfoAtom
slideshow.getDocumentRecord().addChildBefore(
slideShowDocInfoAtomRecord,
record
);
slideshow.getDocumentRecord().removeChild(record);
} else { // we must create new SlideShowDocInfoAtom
slideShowDocInfoAtomRecord = new SlideShowDocInfoAtom();
// add this SlideShowDocInfoAtom before EndDocumentAtom
slideshow.getDocumentRecord().addChildBefore(
slideShowDocInfoAtomRecord,
slideshow.getDocumentRecord().findFirstOfType(1002) // 1002 = 0x3ea = RT_EndDocumentAtom
);
}
return slideShowDocInfoAtomRecord;
}
public static void main(String[] args) throws Exception {
HSLFSlideShow slideshow = new HSLFSlideShow(new FileInputStream("Presentation.ppt"));
SlideShowDocInfoAtom slideShowDocInfoAtomRecord = getSlideShowDocInfoAtom(slideshow);
slideShowDocInfoAtomRecord.setfKioskMode(true);
slideShowDocInfoAtomRecord.setRestartTime(300000);
hexDumpRecord(slideShowDocInfoAtomRecord);
FileOutputStream out = new FileOutputStream("PresentationKiosk.ppt");
slideshow.write(out);
out.close();
slideshow.close();
}
//class SlideShowDocInfoAtom
//having methods for manipulating the [SlideShowDocInfoAtom](https://msdn.microsoft.com/en-us/library/dd908143.aspx)
private static class SlideShowDocInfoAtom extends RecordAtom {
private byte[] data;
public SlideShowDocInfoAtom() {
this.data = new byte[] {
//header
(byte)0x01, (byte)0x00, //MUST be 0x0001 (little endian)
(byte)0x01, (byte)0x04, //MUST be 0x0401 = RT_SlideShowDocInfoAtom (little endian)
(byte)0x50, (byte)0x00, (byte)0x00, (byte)0x00, //MUST be 0x00000050 (little endian)
//R //G //B //isRGB
(byte)0x00, (byte)0xFF, (byte)0x00, (byte)0xFE, //penColor green
(byte)0xe0, (byte)0x93, (byte)0x04, (byte)0x00, //restartTime 300000 ms (0x493e0, little endian)
(byte)0x00, (byte)0x00, //startSlide, only if fUseSlideRange is set
(byte)0x00, (byte)0x00, //endSlide, only if fUseSlideRange is set
//namedShow (64 bytes), only filled if there are named shows and fDocUseNamedShow is set, else all 0x00
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //8
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //16
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //24
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //32
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //40
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //48
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //56
(byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, (byte)0x00, //64
//H G F E D C B A
//fLoopContinuously,fWillSkipNarration,fKioskMode,fBrowseMode,fDocUseNamedShow,fUseSlideRange,fWillSkipBuilds,fAutoAdvance
(byte)Integer.parseInt("00010000", 2), //only fBrowseMode is set
// I
//0,0,0,0,0,0,0,fHideScrollBar
(byte)Integer.parseInt("00000000", 2),
(byte)0x00, (byte)0x00 //unused
};
}
public SlideShowDocInfoAtom(byte[] data) {
this.data = data;
}
public void setfKioskMode(boolean on) {
byte HGFEDCBA = this.data[84];
HGFEDCBA &= (byte)Integer.parseInt("110011111", 2); //fKioskMode and fBrowseMode = 0
if (on) HGFEDCBA |= (byte)Integer.parseInt("10100000", 2); //fLoopContinuously = 1 and fKioskMode = 1
else HGFEDCBA |= (byte)Integer.parseInt("00010000", 2); //fBrowseMode = 1
this.data[84] = HGFEDCBA;
}
public void setRestartTime(long milliseconds) {
//must be greater than or equal 300000
if (milliseconds < 300000) return;
this.data[12] = (byte) (milliseconds & 0xFF);
this.data[13] = (byte) ((milliseconds >> 8) & 0xFF);
this.data[14] = (byte) ((milliseconds >> 16) & 0xFF);
this.data[15] = (byte) ((milliseconds >> 24) & 0xFF);
}
//TODO: other setters
@Override
public void writeOut(OutputStream out) throws IOException {
out.write(data);
}
@Override
public long getRecordType() { return 1025; }
}
}
关于java - 如何使用 apache-poi 或其他第三个库更改 ppt 演示模式?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53894044/