Drag an Outlook email into a JavaFX Application - javafx

Question

I made a Javafx scene to handle drag-n-drop and it is working fine if you drag a file from the windows explorer or from the desktop for example.
However, if I try to do it from Outlook, the behavior is weird.
I realized that when you drag n drop from another program inside the dragboard component, the method "getContentTypes" will return a few DataFormat objects using this code:
dragField.setOnDragOver((DragEvent event) -> {
Dragboard db = event.getDragboard();
System.out.println(db.getContentTypes());
});
The output will be something like:
[text/plain] - De Objet Reçu Taille Catégories D D Test 13:56 40 Ko [DragImageBits] -
java.nio.HeapByteBuffer[pos=0 lim=90304 cap=90304]
[message/external-body;access-type=clipboard;index=0;name="testEmail.msg"] -
null [Object Descriptor] - java.nio.HeapByteBuffer[pos=0 lim=74
cap=74] [RenPrivateItem] - null [CSV] - java.nio.HeapByteBuffer[pos=0
lim=282 cap=282]
It seems to be able to extract the information from the Outlook msg file, since I got something like a header and also the "testEmail.msg" file name is correct.
However, when I try to use this code:
DataFormat.lookupMimeType("message/external-body;access-type=clipboard;index=0;name=\"testEmail.msg\"");
It returns null... In fact, there is a "null" by the mime-type side.
Is there any way to transform these DataFormat objects into a java file or maybe a apache poi msg file? Anything would be amazing.
Thanks for any help! :D

Answer 1

If there is a mime type starting with message/external-body;access-type=clipboard, you can get the value using
clipboard.getContent(new DataFormat("message/external-body"));
Here is an example which just saves the file:
private boolean clipboardHasInMemoryFile(Clipboard clipboard) {
for (DataFormat d: clipboard.getContentTypes()) {
if (d.toString().startsWith("[message/external-body;access-type=clipboard")) {
return true;
}
}
return false;
}
public void saveOutlookFile() throws IOException {
Clipboard clipboard = Clipboard.getSystemClipboard();
if (clipboardHasInMemoryFile(clipboard)) {
//this is for copying an outlook attachment
String name = "outfile";
for (DataFormat d : clipboard.getContentTypes()) {
if (d.toString().startsWith("[message/external-body;access-type=clipboard")) {
Pattern p = Pattern.compile("name=\"([^\"]*)\"");
Matcher m = p.matcher(d.toString());
m.find();
name = m.group(1);
break;
}
}
Object inMemoryFile = null;
try {
DataFormat df = DataFormat.lookupMimeType("message/external-body");
if (df == null) {
df = new DataFormat("message/external-body");
}
inMemoryFile = clipboard.getContent(df);
} catch (Throwable t) {
}
final String fileName = name;
if (inMemoryFile != null) {
if (inMemoryFile instanceof ByteBuffer) {
ByteBuffer b = (ByteBuffer) inMemoryFile;
byte bytes[] = b.array();
FileOutputStream fo = new FileOutputStream(fileName);
fo.write(b.array());
fo.close();
}
}
}
}