我做一个项目使用的苔丝二，我想使用的方法 pixConvertRGBToLuminance ，但它总是错误：

 没有找到实现原生LCOM /谷歌code / leptonica /安卓/像素; .nativePixConvertRGBToLuminance：（一）我。
 

ç的Java我的$ C $是：

 公共静态Pix的pixConvertRGBToLuminance（Pix的pixs）{
    如果（pixs == NULL）
        抛出新抛出：IllegalArgumentException（源PIX必须为非空）;

    INT nativePixd = nativePixConvertRGBToLuminance（pixs.getNativePix（））;

    返回新Pix的（nativePixd）;

}
 

我的code的.cpp是：

  jint Java_com_google code_letonica_android_Pix_nativePixConvertRGBToLuminance（JNIEnv的* ENV，
    JCLASS clazz中，jint nativePixs）{

PIX * pixs =（PIX *）nativePixs;

LOGE（------------------＆GT;无法找到本地pixConvertRGBToLuminance文件）;
PIX * pixd = pixConvertRGBToLuminance（pixs）;
返回（jint）pixd;
}
 

Leptonica的原来的code是：

  PIX * pixConvertRGBToLuminance（PIX * pixs）
{
  返回pixConvertRGBToGray（pixs，0.0，0.0，0.0）;
}`
 

为什么我总是有错吗？THX。

 的externCjint Java_com_google code_letonica_android_Pix_nativePixConvertRGBToLuminance（JNIEnv的* ENV，
    JCLASS clazz中，jint nativePixs）{

PIX * pixs =（PIX *）nativePixs;

LOGE（------------------＆GT;无法找到本地pixConvertRGBToLuminance文件）;
PIX * pixd = pixConvertRGBToLuminance（pixs）;
返回（jint）pixd;
}
 

请参照Calling从C ++在Android的Java函数通过JNI

I do a project in using Tess-two, i want to use the method pixConvertRGBToLuminance, but it always the error:

No implementation found for native Lcom/googlecode/leptonica/android/Pix;.nativePixConvertRGBToLuminance:(I)I. 

My code Java is:

public static Pix pixConvertRGBToLuminance(Pix pixs){
    if (pixs == null)
        throw new IllegalArgumentException("Source pix must be non-null");

    int nativePixd = nativePixConvertRGBToLuminance(pixs.getNativePix());

    return new Pix(nativePixd);

}

My code .cpp is:

jint Java_com_googlecode_letonica_android_Pix_nativePixConvertRGBToLuminance(JNIEnv *env,
    jclass clazz, jint nativePixs){

PIX *pixs = (PIX *)nativePixs;

LOGE("------------------>Failed to find native pixConvertRGBToLuminance File");
PIX *pixd = pixConvertRGBToLuminance(pixs);
return (jint) pixd;
}

The original code of Leptonica is :

PIX * pixConvertRGBToLuminance(PIX *pixs)
{
  return pixConvertRGBToGray(pixs, 0.0, 0.0, 0.0);
}`

so why I always have the fault?Thx.

extern "C" jint Java_com_googlecode_letonica_android_Pix_nativePixConvertRGBToLuminance(JNIEnv *env,
    jclass clazz, jint nativePixs){

PIX *pixs = (PIX *)nativePixs;

LOGE("------------------>Failed to find native pixConvertRGBToLuminance File");
PIX *pixd = pixConvertRGBToLuminance(pixs);
return (jint) pixd;
}

Refer Calling a Java function from C++ on Android over JNI