我使用这个库github:gphoto2-jna来访问我的尼康。我得到了预览工作(实时预览并将预览图像保存到磁盘),但我陷入了捕捉普通照片并将其保存到磁盘的困境。我认为我的问题只是一个指针问题,但是由于我没有使用这些东西,所以我很难弄清楚这个问题:D
这是我制作的代码:
public void takePhoto() {
CameraFilePath captureImage = captureImage(_camera, _context);
PointerByReference pbRef = new PointerByReference(captureImage.getPointer());
byte[] cameraFileData = getCameraFileData(pbRef, _camera, _context); //from demo
BufferedImage image = ImageIO.read(new ByteArrayInputStream(cameraFileData));
//write image to disk
}
public static PointerByReference captureImage(Camera camera, PointerByReference context) {
CameraFilePath.ByReference cameraPath = new CameraFilePath.ByReference();
PointerByReference pbRef = new PointerByReference(cameraPath.getPointer());
{
check(Gphoto2Library.INSTANCE.gp_file_new(pbRef));
pbRef.setPointer(pbRef.getValue());
}
synchronized (LOCK_OBJECT_CAPTURE) {
check(Gphoto2Library.INSTANCE.gp_camera_capture(camera, 0, cameraPath, context));
}
return cameraPath;
}
public static byte[] getCameraFileData(PointerByReference cameraFile, Camera camera, PointerByReference context) {
PointerByReference pref = new PointerByReference();
LongByReference longByRef = new LongByReference();
int captureRes = check(Gphoto2Library.INSTANCE.gp_file_get_data_and_size(cameraFile, pref, longByRef));
if (captureRes >= 0) {
// throws NullPointer
return pref.getValue().getByteArray(0, (int) longByRef.getValue());
} else {
return null;
}
}
如果您知道如何解决此问题,请告诉我。提前致谢!