添加了QT + = svg,我尝试了QT + = svg和更多(QT_MAJOR_VERSION,4):QT + = svg到.pro解决方案文件并从QtCreator内部运行qmake并得到此错误:
错误:QT中的未知模块:svg
有任何想法吗?
我正在尝试运行这个简单的OpenCV程序,但是我遇到了这个错误:
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file .../opencv/modules/highgui/src/window.cpp, line 276
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码:
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
int main()
{
cout << "Hello World!" << endl;
cv::Mat inputImage = cv::imread("/home/beniz1.jpg");
cv::imshow("Display Image", inputImage);
return 0;
}
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这个错误的原因是什么?
例如,在文档中有:
void cv::absdiff ( InputArray src1,
InputArray src2,
OutputArray dst
)
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这是一样的:
void cv::absdiff ( Mat src1,
Mat src2,
Mat dst
)
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要么:
void cv::absdiff ( Mat* src1,
Mat* src2,
Mat* dst
)
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?
我需要这个来创建新的功能,例如
void absDiffSay(XXX src1, XXX src2, XXX dst)
{
cv::absdiff(src1,src2,dst);
cout<<"absdiff"<<endl;
}
Run Code Online (Sandbox Code Playgroud) 我有内存泄漏的项目.我可以找到它们,所以我清理我的main.cpp文件,现在它看起来像:
int main()
{
return 0;
}
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当我用命令检查内存时:
valgrind --leak-check=full --show-leak-kinds=all ./MyProgram > log1.txt 2>&1
我遇到了这个错误:
==5219==
==5219== LEAK SUMMARY:
==5219== definitely lost: 0 bytes in 0 blocks
==5219== indirectly lost: 0 bytes in 0 blocks
==5219== possibly lost: 728 bytes in 18 blocks
==5219== still reachable: 44,676 bytes in 224 blocks
==5219== of which reachable via heuristic:
==5219== newarray : 832 bytes in 16 blocks
==5219== suppressed: 0 bytes in 0 blocks
==5219==
==5219== For counts of …Run Code Online (Sandbox Code Playgroud) 什么时候应该使用shared_ptr和unique_ptr?
例如,在此类中,而不是node*应该是shared_ptr或unique_ptr.它取决于什么?
class node
{
private:
node *parent;
vector<node*> children;
/*
* txny
* x - numer drzewa
* y - numer wezla
*/
string id;
typeNode type; //0 - term, 1 - func
public:
node(node* parent, string id, typeNode type);
virtual ~node() {}
void addChild(node* child);
void setChildren(vector<node*> &children);
node* getChild(int i);
int getChildrenNumber();
void setParent(node* parent);
node* getParent();
string getId();
typeNode getType();
void setId(string id);
};
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编辑:
类树拥有节点对象.我必须写更多的文字因为不能保存更改.
class tree
{
private:
vector <node*> nodes;
int depth;
int …Run Code Online (Sandbox Code Playgroud) c++ ×4
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shared-ptr ×1
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