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微信扫一扫的扫码功能很弱,速度慢,经常有二维码识别不了。Dynamsoft的同事怀疑微信的扫码不是在本地完成的,而是把数据传输到了server端来解码。如何才能得到答案?
为什么会有人怀疑微信的扫码是需要连接server的,原因在于在断网的情况下,微信扫描是不可用的。那么在联网的情况下怎么可以知道数据传输了没有?我在手机上打开状态栏网速显示。
数值很小,不可能有图像数据传输。扫码应该是本地完成的。再进一步验证下。
手机应用的安装包其实就是一个压缩包,用7zip解压,打开目录lib\armeabi。里面包涵了微信安卓应用所用到的C/C++动态链接库。
大概扫一下,看到了libwechatQrMod.so,应该就是用于二维码的了。用atom打开,居然发现了这个:
微信的1D/2D barcode解码居然用的是开源的ZXing!腾讯应该做了一些修改。
通过jadx反编译dex文件,可以看到有一个叫QbarNative的类:
package com.tencent.qbar; import android.graphics.Bitmap; import android.graphics.Point; import com.tencent.mm.compatible.util.j; import java.io.UnsupportedEncodingException; public class QbarNative { public static byte[] data; public static byte[] jZG; public static byte[] jZH; public static int[] jZI; private static class a { } public static native int Encode(byte[] bArr, int[] iArr, String str, int i, int i2, String str2, int i3); private static native int EncodeBitmap(String str, Bitmap bitmap, int i, int i2, int i3, int i4, String str2, int i5); public static native int FocusInit(inti, int i2, boolean z, int i3, int i4); public static native boolean FocusPro(byte[] bArr, boolean z, boolean[] zArr); public static native int FocusRelease(); private static native int GetOneResult(byte[] bArr, byte[] bArr2, byte[] bArr3, int[] iArr); private static native int GetResults(byte[] bArr, byte[] bArr2, byte[] bArr3, Point[] pointArr, int[] iArr, a aVar); public static native String GetVersion(); public static native int Init(int i, int i2, int i3, String str, String str2); public static native int QIPUtilYUVCrop(byte[] bArr, byte[] bArr2, int i, int i2, int i3, int i4, int i5, int i6); public static native int Release(); public static native int ScanImage(byte[] bArr, int i, int i2, int i3); public static native int SetReaders(int[] iArr, int i); public static native int focusedEngineForBankcardInit(int i, int i2, int i3, boolean z); public static native int focusedEngineGetVersion(); public static native int focusedEngineProcess(byte[] bArr); public static native int focusedEngineRelease(); private static native int nativeArrayConvert(int i, int i2, byte[] bArr, int[] iArr); private static native int nativeCropGray2(byte[] bArr, byte[] bArr2, int i, int i2, int i3); private static native int nativeGrayRotateCropSub(byte[] bArr, int i, int i2, int i3, int i4, int i5, int i6, byte[] bArr2, int[] iArr, int i7, int i8); public static native int nativeRelease(); private static native int nativeTransBytes(int[] iArr, byte[] bArr, int i, int i2); private static native int nativeTransPixels(int[] iArr, byte[] bArr, int i, int i2); private static native int nativeYUVrotate(byte[] bArr, byte[] bArr2, int i, int i2); private static native int nativeYUVrotateLess(byte[] bArr, int i, int i2); private static native int nativeYuvToCropIntArray(byte[] bArr, int[] iArr, int i, int i2, int i3, int i4, int i5, int i6); static { jZG = new byte[100]; data = new byte[3000]; jZH = new byte[100]; jZI = new int[4]; j.a("wechatQrMod", QbarNative.class.getClassLoader()); } public static int a(StringBuilder stringBuilder, StringBuilder stringBuilder2) { int GetOneResult = GetOneResult(jZG, data, jZH, jZI); try { String str = new String(jZH, 0, jZI[2], "UTF-8"); if (str.equals("ANY")) { stringBuilder.append(new String(jZG, 0, jZI[0], "UTF-8")); stringBuilder2.append(new String(data, 0, jZI[1], "UTF-8")); if (stringBuilder2.length() == 0) { stringBuilder.append(new String(jZG, 0, jZI[0], "ASCII")); stringBuilder2.append(new String(data, 0, jZI[1], "ASCII")); } } else { stringBuilder.append(new String(jZG, 0, jZI[0], str)); stringBuilder2.append(new String(data, 0, jZI[1], str)); } } catch (UnsupportedEncodingException e) { } return GetOneResult; } public static int a(byte[] bArr, int[] iArr, byte[] bArr2, int i, int i2, int i3, int i4, int i5, int i6, int i7) { if (bArr == null || bArr2 == null) { return -1; } return nativeGrayRotateCropSub(bArr2, i, i2, i3, i4, i5, i6, bArr, iArr, i7, 0); } public static int a(byte[] bArr, byte[] bArr2, int i, int i2) { if (bArr2 == null) { return -1; } return nativeYUVrotate(bArr, bArr2, i, i2); } public static int a(byte[] bArr, byte[] bArr2, int i, int i2, int i3) { if (bArr == null || bArr2 == null) { return -1; } return nativeCropGray2(bArr, bArr2, i, i2, i3); } public static int a(byte[] bArr, int[] iArr, int i, int i2, int i3, int i4, int i5, int i6) { if (bArr == null) { return -1; } return nativeYuvToCropIntArray(bArr, iArr, i, i2, i3, i4, i5, i6); } }
这下可以完全确认微信的扫码是在手机上完成的。
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原文地址:http://my.oschina.net/yushulx/blog/495471