我正在尝试使用UWP应用程序使用VideoOCR dll来读取Passport MRZ代码。但是，只要我加载DLL，应用程序完全崩溃并出现以下错误：无法加载DLL＆＃39; videoocr.dll＆＃39;：找不到指定的模块。 （HRESULT异常：0x8007007E）
** bin文件夹中的dll位置
public partial class ViewModel
{
// Location of the DLL required
private const String DLL_LOCATION = "videoocr.dll";
// structure required for MRZ data
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct DLL_MRZDATA
{
[MarshalAs(UnmanagedType.BStr)]
public String RawMRZ;
[MarshalAs(UnmanagedType.BStr)]
public String DocumentNumber;
[MarshalAs(UnmanagedType.BStr)]
public String DOB;
[MarshalAs(UnmanagedType.BStr)]
public String Expiry;
[MarshalAs(UnmanagedType.BStr)]
public String Issuer;
[MarshalAs(UnmanagedType.BStr)]
public String Nationality;
[MarshalAs(UnmanagedType.BStr)]
public String LastNames;
[MarshalAs(UnmanagedType.BStr)]
public String FirstNames;
[MarshalAs(UnmanagedType.BStr)]
public String Type;
[MarshalAs(UnmanagedType.BStr)]
public String Discretionary1;
[MarshalAs(UnmanagedType.BStr)]
public String Discretionary2;
[MarshalAs(UnmanagedType.BStr)]
public String Gender; // added 130810
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct DLL_STATUS
{
[MarshalAs(UnmanagedType.Bool)]
public Boolean CameraPresent;
[MarshalAs(UnmanagedType.Bool)]
public Boolean PassportPresent;
[MarshalAs(UnmanagedType.Bool)]
public Boolean RFIDPresent;
[MarshalAs(UnmanagedType.Bool)]
public Boolean Active;
[MarshalAs(UnmanagedType.Bool)]
public Boolean Busy;
[MarshalAs(UnmanagedType.Bool)]
public Boolean MRZDecoded;
[MarshalAs(UnmanagedType.Bool)]
public Boolean RFIDDecoded;
[MarshalAs(UnmanagedType.Bool)]
public Boolean UVEnabled;
[MarshalAs(UnmanagedType.Bool)]
public Boolean RFIDEnabled;
[MarshalAs(UnmanagedType.Bool)]
public Boolean ColourEnabled;
[MarshalAs(UnmanagedType.Bool)]
public Boolean AutoStopEnabled;
[MarshalAs(UnmanagedType.Bool)]
public Boolean InfraredEnabled;
[MarshalAs(UnmanagedType.Bool)]
public Boolean BadDecode; // added 110810
[MarshalAs(UnmanagedType.Bool)]
public Boolean DocumentPresent; // added 110810
}
// DLL function signatures
[DllImport(DLL_LOCATION)]
private static extern Boolean voInitialiseReader(Boolean InfraRed, Boolean Colour, Boolean UV, Boolean RFID, Boolean AutoStop);
[DllImport(DLL_LOCATION)]
private static extern Boolean voStartRead();
[DllImport(DLL_LOCATION)]
private static extern Boolean voStopRead();
[DllImport(DLL_LOCATION)]
private static extern Boolean voQueryReaderState(ref DLL_STATUS Status);
[DllImport(DLL_LOCATION)]
private static extern Boolean voRegisterMrzCallback(MRZDelegate Callback, [MarshalAs(UnmanagedType.U4)] ref UInt32 Parameter);
[DllImport(DLL_LOCATION)]
private static extern Boolean voRegisterImageCallback(ImageDelegate Callback, ref UInt32 Parameter);
[DllImport(DLL_LOCATION)]
private static extern Boolean voTerminate();
[DllImport(DLL_LOCATION)]
private static extern Boolean voGetImage(int ImageType, Boolean FullSize);
}
这是我的VM代码
public partial class ViewModel
{
// Delegate definitions
private delegate void updatePictureBox(int bitmap, int imageType);
private delegate void MRZDelegate(ref UInt32 Parameter, ref DLL_MRZDATA Data);
private delegate void ImageDelegate(ref UInt32 Parameter, int ImageType, IntPtr hBitmap);
private delegate void BadDecodeDelegate(ref UInt32 Parameter, [MarshalAs(UnmanagedType.BStr)] String BadMRZ, UInt32 hBitmap);
private delegate void updateMrzTextBox(string text);
private DLL_STATUS Status;
private MRZDelegate md;
private ImageDelegate id;
public ViewModel()
{
// Get Form class as we need to update when data arrives
// create the delegates for the callback functions
md = new MRZDelegate(MRZCallback);
id = new ImageDelegate(ImageCallback);
Status = new DLL_STATUS();
}
public void initialiseReader()
{
// Start up the reader Set up capture of all illumination types and RFID
Boolean Temp = voInitialiseReader(true, true, true, true, false);
UInt32 Val = 0;
// register image and MRZ callback functions
voRegisterMrzCallback(md, ref Val);
voRegisterImageCallback(id, ref Val);
}
public void reInitialiseReader()
{
// Terminates all the process threads and goes into an ide state
voTerminate();
// Set up capture of all illumination types and RFID
voInitialiseReader(true, true, true, true, false);
UInt32 Val = 0;
// register image and MRZ callback functions
voRegisterMrzCallback(md, ref Val);
voRegisterImageCallback(id, ref Val);
}
public void startReader()
{
// Start the capture system of the scanner
Boolean status = voStartRead();
}
public void getIRImage()
{
// Takes a colour image of whats on scanner plate
voGetImage(0, true);
}
public void getColourImage()
{
// Takes a colour image of whats on scanner plate
voGetImage(1, true);
}
public void getUVImage()
{
// Takes a colour image of whats on scanner plate
voGetImage(2, true);
}
public Boolean getScannerStatus()
{
// Get current status of the system
Boolean returnValue = voQueryReaderState(ref Status);
return (returnValue);
}
private void updateTextBox(string text)
{
//frontend.textBoxMRZ.Text = text;
}
private void updatePicture(int bitmap, int imageType)
{
//switch (imageType)
//{
// case 0:
// frontend.pictureBoxGrey.Image = bitmap; break;
// case 1:
// frontend.pictureBoxColour.Image = bitmap; break;
// case 2:
// frontend.pictureBoxUV.Image = bitmap; break;
// case 3:
// frontend.pictureBoxRFID.Image = bitmap;
// break;
//}
}
private void MRZCallback(ref UInt32 Parameter, ref DLL_MRZDATA Data)
{
// Make sure the text box update is running in the same thread as the form ;
//frontend.textBoxMRZ.Invoke(new updateMrzTextBox(updateTextBox), Data.RawMRZ);
}
private void ImageCallback(ref UInt32 Parameter, int ImageType, IntPtr Handle)
{
//Bitmap bitmap;
// depending on the image type - store and display the new image
//switch (ImageType)
//{
// case 0:
// bitmap = System.Drawing.Image.FromHbitmap(Handle);
// frontend.pictureBoxGrey.Invoke(new updatePictureBox(updatePicture), new Object[] { bitmap, ImageType });
// break;
// case 1: bitmap = (Bitmap)System.Drawing.Image.FromHbitmap(Handle).Clone();
// frontend.pictureBoxColour.Invoke(new updatePictureBox(updatePicture), new Object[] {
// bitmap, ImageType} ); break;
// case 2: bitmap = System.Drawing.Image.FromHbitmap(Handle);
// frontend.pictureBoxUV.Invoke(new updatePictureBox(updatePicture), new Object[] { bitmap,
// ImageType }); break;
// case 3:
// bitmap = System.Drawing.Image.FromHbitmap(Handle);
// frontend.pictureBoxRFID.Invoke(new updatePictureBox(updatePicture), new Object[] { bitmap, ImageType });
// break;
//}
}
public Boolean RFIDPresent { get { return (Status.RFIDPresent); } }
public Boolean RFIDecoded { get { return (Status.RFIDDecoded); } }
public Boolean busy { get { return (Status.Busy); } }
public Boolean passportPresent { get { return (Status.PassportPresent); } }
public Boolean documentPresent { get { return (Status.DocumentPresent); } }
public Boolean MRZDecoded { get { return (Status.MRZDecoded); } }
}
这个代码第二件事是使用System.Drawing（Bitmap），但是UWP不支持它，所以我可以使用什么？