我正在尝试开发基于相机的方程式求解器，它需要使用 wamp 将相机点击的图像上传到本地服务器。这是我的 android 代码。它有两个按钮，一个用于上传手写方程式相机图像，另一个用于上传打印的方程式相机图像。根据按下的按钮，将从我的笔记本电脑执行一个特定的 .php 文件，以将上传的图像存储在 c:/wamp/www/upload 的文件夹中。目前我正在测试带有手写方程图像按钮的上传部分。
封装 EqSolver.example;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.graphics.Bitmap.CompressFormat;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.*;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.*;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.ProgressDialog;
public class EqSolverActivity extends Activity {
private SurfaceView m_Preview = null;
private SurfaceHolder m_PreviewHolder = null;
private Camera m_Camera = null;
private Builder m_Builder;
private Button m_QueryButton = null;
private int m_QueryType;
public static final String QUERY_IMAGE_1 = "query_image_1";
public static final String QUERY_IMAGE_2 = "query_image_2";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/* Use full screen and remove window title */
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
/* Create message dialog for showing text */
m_Builder = new AlertDialog.Builder(this);
m_Builder.setTitle("Solution");
/* Class to take care of the photo application */
m_Preview = (SurfaceView) findViewById(R.id.SurfaceView01);
m_PreviewHolder = m_Preview.getHolder();
m_PreviewHolder.addCallback(surfaceCallback);
m_PreviewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
/* Add button for query/add */
m_QueryButton = (Button) findViewById(R.id.solveHW);
m_QueryButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
m_QueryType = 1;
takePicture();
}
});
m_QueryButton = (Button) findViewById(R.id.solveP);
m_QueryButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
m_QueryType = 0;
takePicture();
}
});
m_QueryButton = (Button) findViewById(R.id.confirm);
m_QueryButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
TextView editView = (TextView) findViewById(R.id.equation);
Button button = (Button) findViewById(R.id.confirm);
Log.v("Final Equation: ", editView.getText().toString());
editView.setVisibility(View.INVISIBLE);
button.setVisibility(View.INVISIBLE);
byte[] imageBytes = editView.getText().toString().getBytes();
ServerPushAsync mAsync = new ServerPushAsync(imageBytes, -1,
QUERY_IMAGE_2);
mAsync.execute();
}
});
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_CAMERA
|| keyCode == KeyEvent.KEYCODE_SEARCH) {
m_QueryType = 0;
takePicture();
return (true);
}
return (super.onKeyDown(keyCode, event));
}
private void takePicture() {
m_Camera.takePicture(null, null, photoCallback);
}
Camera.PictureCallback photoCallback = new Camera.PictureCallback() {
private Camera m_Camera;
public void onPictureTaken(byte[] data, Camera m_Camera) {
/* Downsize the image from the camera */
Bitmap bImage = BitmapFactory.decodeByteArray(data, 0, data.length);
bImage = Bitmap.createScaledBitmap(bImage, 640, 480, false);
ByteArrayOutputStream oData = new ByteArrayOutputStream();
bImage.compress(CompressFormat.JPEG, 85, oData);
this.m_Camera = m_Camera;
/* Query image */
ServerPushAsync mAsync = new ServerPushAsync(oData.toByteArray(),
m_QueryType, QUERY_IMAGE_1);
mAsync.execute();
}
};
/*
* COPY THE FOLLOWING FUNCTION TO YOUR CLASS IF YOU PLAN TO USE TEXT
* RECOGNITION SERVICE
*/
/* Send HTTP POST request with image data to image recognition server */
public static String QueryImage1(byte[] bData, int iQueryType) {
/* Setup http objects */
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost;
if (iQueryType == 1) {
httpPost = new HttpPost(
"http://192.168.1.5/EqSolverProcessWritten.php");
} else {
httpPost = new HttpPost(
"http://192.168.1.5/EqSolverProcessPrinted.php");
}
ByteArrayEntity bEntity = new ByteArrayEntity(bData);
String sResult = null;
try {
/* Construct data */
httpPost.setEntity(bEntity);
/* Send HTTP request */
HttpResponse httpResponse = httpClient.execute(httpPost);
/* Get the text results from the response */
BufferedReader hBufferedReader = new BufferedReader(
new InputStreamReader(httpResponse.getEntity().getContent()));
StringBuilder sInputBuffer = new StringBuilder();
try {
String sInputLine = null;
while ((sInputLine = hBufferedReader.readLine()) != null)
sInputBuffer.append(sInputLine + "\n");
} catch (Exception ex) {
} finally {
try {
httpResponse.getEntity().getContent().close();
} catch (Exception ex) {
}
}
sResult = sInputBuffer.toString();
Log.v("RECEIVED", sResult);
} catch (Exception e) {
Log.e("Exception", e.toString());
}
return sResult;
};
public static String QueryImage2(byte[] bData) {
/* Setup http objects */
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(
"http://192.168.1.5/EqSolverSolve.php");
String test = "THIS IS A TEST";
ByteArrayEntity bEntity = new ByteArrayEntity(bData);
String sResult = null;
try {
/* Construct data */
httpPost.setEntity(bEntity);
/* Send HTTP request */
HttpResponse httpResponse = httpClient.execute(httpPost);
/* Get the text results from the response */
BufferedReader hBufferedReader = new BufferedReader(
new InputStreamReader(httpResponse.getEntity().getContent()));
StringBuilder sInputBuffer = new StringBuilder();
try {
String sInputLine = null;
while ((sInputLine = hBufferedReader.readLine()) != null)
sInputBuffer.append(sInputLine + "\n");
} catch (Exception ex) {
} finally {
try {
httpResponse.getEntity().getContent().close();
} catch (Exception ex) {
}
}
sResult = sInputBuffer.toString();
Log.v("RECEIVED", sResult);
} catch (Exception e) {
}
return sResult;
};
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
public void surfaceCreated(SurfaceHolder holder) {
m_Camera = Camera.open();
/* Set the camera parameters to take the smallest image as possible */
Camera.Parameters currentParameters = m_Camera.getParameters();
m_Camera.setParameters(currentParameters);
try {
m_Camera.setPreviewDisplay(m_PreviewHolder);
} catch (Throwable t) {
Log.e("PictureDemo-surfaceCallback",
"Exception in setPreviewDisplay()", t);
Toast.makeText(EqSolverActivity.this, t.getMessage(),
Toast.LENGTH_LONG).show();
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Camera.Parameters currentParameters = m_Camera.getParameters();
currentParameters.setPreviewSize(width, height);
currentParameters.setPictureFormat(PixelFormat.JPEG);
m_Camera.setParameters(currentParameters);
m_Camera.startPreview();
}
public void surfaceDestroyed(SurfaceHolder holder) {
m_Camera.stopPreview();
m_Camera.release();
m_Camera = null;
}
};
/**
* Asynchronous task ... Runs in background thread , does not block the UI
*/
private class ServerPushAsync extends AsyncTask<String, String, String> {
private byte[] bData;
private int iQueryType;
private String QueryImageType;
private AlertDialog pg;
public ServerPushAsync(byte[] bData, int iQueryType,
String QueryImageType) {
this.bData = bData;
this.iQueryType = iQueryType;
this.QueryImageType = QueryImageType;
}
@Override
public void onPreExecute() {
super.onPreExecute();
pg = new ProgressDialog(EqSolverActivity.this);
pg.setCancelable(false);
((ProgressDialog) pg)
.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pg.setMessage("Pushing image to server...");
pg.show();
}
protected String doInBackground(String... args) {
String response = "";
if (QueryImageType.equals(QUERY_IMAGE_1)) {
response = EqSolverActivity.QueryImage1(bData, iQueryType);
} else {
// query_image_2
response = EqSolverActivity.QueryImage2(bData);
}
return response;
}
@Override
protected void onPostExecute(String response) {
if (pg != null) {
pg.dismiss();
}
if (response == null) {
response = "something went wrong";
}
if (response.equals("")) {
response = "something went wrong";
Log.e("ERROR", "NO response captured");
}
if (QueryImageType.equals(QUERY_IMAGE_1)) {
/* Display equation and wait for confirmation from user */
TextView editView = (TextView) findViewById(R.id.equation);
Button button = (Button) findViewById(R.id.confirm);
editView.setText(response);
editView.setVisibility(View.VISIBLE);
button.setVisibility(View.VISIBLE);
m_Camera.startPreview();
} else {
TextView editView = null;
// query_image_2
m_Builder.setMessage((QueryImage2(editView.getText().toString()
.getBytes())));
editView.setText("");
m_Builder.show();
}
}
}
}
这是我的 php 代码，用于处理手写方程。 EqSolverHandwritten.php
<?php
$command = "del /F C:\wamp\www\upload\tessLineImg.txt";
exec($command);
$command = "del /F C:\wamp\www\upload\lineImgCorr.jpg";
exec($command);
$command = "del /F C:\wamp\www\upload\TessOutput.txt";
exec($command);
$command = "del /F C:\wamp\www\upload\svmOutput.txt";
exec($command);
/* Get input and configuration parameters */
$bData = file_get_contents('php://input');
/* Setup time stamp for different queries */
$fCurrTime = time(true);
$fJune01 = 1338447600;
$fDiffSec = $fCurrTime - $fJune01;
$fHour = floor( ($fDiffSec%86400)/3600);
$fMinute = floor( ($fDiffSec%3600)/60 );
$sTimeStamp = sprintf('%02d%02d_%.0f', $fHour, $fMinute, $fDiffSec%10);
//$sTimeStamp = time();
/* Setup file names and upload paths */
$sInputFileJpg = './inputImg_'.$sTimeStamp.'.jpg';
$photo_upload_path = './upload/'.$sInputFileJpg;
/* Save the uploaded jpg image to file */
file_put_contents( $photo_upload_path, $bData);
?>
最佳答案
我终于解决了这个错误，想在很长一段时间后将其发布在这里。我只需要关闭我的防火墙，它就像魔术一样工作:D!
关于php - 从 Android 手机上传图片到笔记本电脑需要太长时间，最后上传时显示“Windows 照片查看器无法显示，因为文件为空”，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30973158/