OpenCV 和 C++:"Can't resolve variable 'Mat`"
OpenCV and C++: "Can't resolve variable 'Mat`"
我正在尝试使用C++语言在Android Java原生界面中集成OpenCV。我已经将OpenCV放在jni
文件夹中,在那里我正在编写C++代码。我已经在HelloNative.c文件中包含了Opencv头文件。但我在尝试访问Mat对象时仍然会遇到这个错误。"Can't resolve variable Mat
"。
我尝试过using namespace cv
,但它给出了一个错误,预先声明using
和namespace
;这不是一个解决方案。我在下面发布了我的代码,请有人看看,让我知道我做错了什么。
#include <string.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <android/asset_manager.h>
#include <android/asset_manager_jni.h>
#include <android/log.h>
#include <malloc.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <OpenCV/include/opencv2/opencv.hpp>
#include <OpenCV/include/opencv/cv.h>
#include <OpenCV/modules/core/include/opencv2/core.hpp>
#include <OpenCV/modules/core/include/opencv2/core/core_c.h>
#include <OpenCV/modules/core/include/opencv2/core/mat.hpp>
#include <OpenCV/modules/imgproc/include/opencv2/imgproc/imgproc.hpp>
#include <OpenCV/modules/imgproc/include/opencv2/imgproc/imgproc_c.h>
#include <OpenCV/modules/legacy/include/opencv2/legacy/legacy.hpp>
#include <OpenCV/modules/videostab/include/opencv2/videostab/motion_stabilizing.hpp>
#include <OpenCV/modules/videostab/include/opencv2/videostab/global_motion.hpp>
JNIEXPORT jint JNICALL
Java_com_example_soimporttest_MainActivity_getStringFromJNI(JNIEnv *env, jobject thisObj,
jstring imagepath) {
const char *jnamestr = (*env)->GetStringUTFChars(env, imagepath, 0);
int width, height, gray;
FILE *fp = fopen(jnamestr, "rb");
if (fp) {
//Read .pgm file
int scan = fscanf(fp, "P5%d%d%d", &width, &height, &gray);
if (scan != 3 || &gray > 256 || &width > 0xfffff || &height > 0xfffff || &gray <= 1 ||
&width < 32 || &height < 32) {
fclose(fp);
return 9;
} else {
return 0;
}
} else {
return -1;
}
}
JNIEXPORT void JNICALL
Java_com_example_soimporttest_MainActivity_displayImage(JNIEnv *env, jobject thisObj, jclass type, jlong inpAddr, jlong outAddr) {
::Mat &src = *(Mat*)inpAddr;
Mat &dst = *(Mat*)outAddr;
applyFilter(src , dst);
}
该文件中有两个函数,第一个函数getStringFromJNI
运行良好。非常感谢。
经过大量研究,我终于找到了一个很好的问题解决方案。请遵循下面提到的教程:https://github.com/leadrien/opencv_native_androidstudio在集成过程中,您将面临一些问题。您可以在评论中发布这些解决方案,我将指导您解决每一个问题。谢谢
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