技术标签: c++ qt VS2022联合Qt5开发 VTK QT5.12.3联合VTK7在VS2022上开发医学图像项目 VTK项目代码学习
这篇博文是接着这个系列前面的博文,来讲如何实现医学图像三视图同步视图。我想到的一个思路是用Scrollbar来控制切面的改变,还有一个想法是在三维图像上取点,然后以这个点为切面中心更新三维视图。这篇博文主要介绍的就是第二个想法的三维图像上取点相关实现准备。
在写这个项目的时候我真的琢磨了很久,网上能参考的资料也不多,下面就来和大家详细分享一下我研究这么久的成果吧。(研究不易,如果你觉得这篇文对你有帮助,请给博主点赞收藏评论三连hhh)
我比较懒,所以这个博客用到的主体代码是之前博客里介绍的,一些前面的准备步骤我已经在相关博客里介绍过了,我这里就不重复写了,大家有困惑的话就挪步瞅瞅我之前的博客吧。
VS2022联合Qt5开发学习5(QT5.12.3联合VTK在VS2022上开发医学图像项目)_vs2022 qt5.12-程序员宅基地
VS2022联合Qt5开发学习7(QT5.12.3联合VTK在VS2022上开发医学图像项目2——十字叉标注)_qt vs开发-程序员宅基地
在正式写到如何在stl三维图像上取点之前,我们先练习一下如何在VTK上取点。下面的实例是一个纯VTK项目,我用的是VTK7,VTK9应该运行也没啥问题。
首先是新建一个PointPickerInteractorStyle 类,写一些用鼠标左键取坐标的相关函数。
GetPoint.h
#pragma once
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2)
VTK_MODULE_INIT(vtkRenderingFreeType)
VTK_MODULE_INIT(vtkInteractionStyle)
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPointPicker.h>
#include <vtkRendererCollection.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkObjectFactory.h> //vtkStandardNewMacro();
#include <vtkProperty.h>
#include <vtkAxesActor.h>
#include <vtkOrientationMarkerWidget.h>
/**************************************************************************************************/
class PointPickerInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static PointPickerInteractorStyle* New();
vtkTypeMacro(PointPickerInteractorStyle, vtkInteractorStyleTrackballCamera);
virtual void OnLeftButtonDown()
{
//打印鼠标左键像素位置
std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0]
<< " " << this->Interactor->GetEventPosition()[1] << std::endl;
//注册拾取点函数
this->Interactor->GetPicker()->Pick(
this->Interactor->GetEventPosition()[0],
this->Interactor->GetEventPosition()[1], 0, // always zero.
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()
);
//打印拾取点空间位置
double picked[3];
this->Interactor->GetPicker()->GetPickPosition(picked);
std::cout << "Picked value: " << picked[0] << " " << picked[1] << " " << picked[2] << std::endl;
//对拾取点进行标记
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->SetPosition(picked);
actor->SetScale(0.05);
actor->GetProperty()->SetColor(1.0, 1.0, 1.0);
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actor);
vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
}
};
然后在cpp文件上构建VTK的actor、render、window,就是那一套标准化流程。大家不熟悉的话可以瞅瞅我之前这个系列的学习笔记:
GetPoint.cpp
#include <GetPoint.h>
vtkStandardNewMacro(PointPickerInteractorStyle);
int main()
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);
renderer->SetBackground(0, 0, 0);
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->Render();
renderWindow->SetWindowName("PointPicker");
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkPointPicker> pointPicker =
vtkSmartPointer<vtkPointPicker>::New();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetPicker(pointPicker);
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkSmartPointer<PointPickerInteractorStyle> style =
vtkSmartPointer<PointPickerInteractorStyle>::New();
renderWindowInteractor->SetInteractorStyle(style);
//
vtkSmartPointer<vtkAxesActor> Axes = vtkSmartPointer<vtkAxesActor>::New();
vtkSmartPointer<vtkOrientationMarkerWidget> widget =
vtkSmartPointer<vtkOrientationMarkerWidget>::New();
widget->SetInteractor(renderWindowInteractor);
widget->SetOrientationMarker(Axes);
widget->SetOutlineColor(1, 1, 1);
widget->SetViewport(0, 0, 0.2, 0.2);
widget->SetEnabled(1);
widget->InteractiveOn();
renderWindow->Render();
renderWindowInteractor->Start();
return 0;
}
这里需要特别注意,这一行一定不要忘记写了
vtkStandardNewMacro(PointPickerInteractorStyle);
关于Qt界面如何取点的相关内容,我已经在之前的博文VS2022联合Qt5开发学习9(QT5.12.3鼠标按下、释放、移动事件以及Qt上取标注点)-程序员宅基地里介绍了,在这里就不再做更多说明了。
这个实例是接着之前的博文做的,所以一些前期的步骤我这里就不重复写了,大家不大清楚的话可以看一下这篇博文:VS2022联合Qt5开发学习7(QT5.12.3联合VTK在VS2022上开发医学图像项目2——十字叉标注)_qt vs开发-程序员宅基地
首先我们需要创建一个自定义的交互器样式类,该类继承自vtkInteractorStyleTrackballCamera
,覆写了鼠标左键按下事件处理函数 OnLeftButtonDown
。在这个函数中,我们使用 vtkPointPicker
实现了鼠标点击位置的三维点选取。
PointPickerInteractorStyle.h
#pragma once
#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2)
VTK_MODULE_INIT(vtkRenderingFreeType)
VTK_MODULE_INIT(vtkInteractionStyle)
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPointPicker.h>
//this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()
#include <vtkRendererCollection.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkObjectFactory.h> //vtkStandardNewMacro();
#include <vtkProperty.h>
#include <vtkAxesActor.h>
#include <vtkOrientationMarkerWidget.h>
class PointPickerInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static PointPickerInteractorStyle* New();
vtkTypeMacro(PointPickerInteractorStyle, vtkInteractorStyleTrackballCamera);
virtual void OnLeftButtonDown()
{
//打印鼠标左键像素位置
std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0]
<< " " << this->Interactor->GetEventPosition()[1] << std::endl;
//注册拾取点函数
this->Interactor->GetPicker()->Pick(
this->Interactor->GetEventPosition()[0],
this->Interactor->GetEventPosition()[1], 0, // always zero.
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()
);
//打印拾取点空间位置
double picked[3];
this->Interactor->GetPicker()->GetPickPosition(picked);
std::cout << "Picked value: " << picked[0] << " " << picked[1] << " " << picked[2] << std::endl;
//对拾取点进行标记
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->SetPosition(picked);
actor->SetScale(5);
actor->GetProperty()->SetColor(1.0, 0, 0);
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actor);
vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
}
};
PointPickerInteractorStyle.cpp
#include "PointPickerInteractorStyle.h"
vtkStandardNewMacro(PointPickerInteractorStyle);
然后我们需要在原来的代码基础上新建这个自定义的交互器样式,其他代码没有什么特别多的变化。
vtkSmartPointer<vtkRenderWindowInteractor> interactor = ui.qvtkWidget->GetRenderWindow()->GetInteractor();
vtkSmartPointer<PointPickerInteractorStyle> style = vtkSmartPointer<PointPickerInteractorStyle>::New();
style->SetDefaultRenderer(renderer);
interactor->SetInteractorStyle(style);
interactor->Initialize();
STLpoint_vtk7.h文件
#pragma once
#include <QtWidgets/QMainWindow>
#include "ui_STLpoint_vtk7.h"
#include <vtkAutoInit.h>
#include <vtkBMPReader.h>
#include <vtkFloatArray.h>
#include <vtkImageActor.h>
#include <vtkImageChangeInformation.h>
#include <vtkImageData.h>
#include <vtkImageImport.h>
#include <vtkImageViewer2.h>
#include <vtkInteractorStyleImage.h>
#include <vtkJPEGReader.h>
#include <vtkLookupTable.h>
#include <vtkMetaImageReader.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPointData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSTLReader.h>
#include <vtkSmartPointer.h>
#include <vtkXMLImageDataWriter.h>
#include <PointPickerInteractorStyle.h>
class STLpoint_vtk7 : public QMainWindow
{
Q_OBJECT
public:
STLpoint_vtk7(QWidget* parent = nullptr);
~STLpoint_vtk7();
private slots:
void openFileSlot();
private:
Ui::STLpoint_vtk7Class ui;
private:
vtkSmartPointer<vtkRenderer> m_vtkRenderer;
vtkSmartPointer<vtkRenderWindow> m_vtkRenderWindow;
private:
vtkSmartPointer<vtkActor> DrawCross(vtkSmartPointer<vtkActor> _Actor, double _Pos[3]);
};
STLpoint_vtk7.cpp文件
#include "STLpoint_vtk7.h"
#include <QDebug>
#include <QFileDialog>
#include <vtkImageBlend.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageChangeInformation.h>
#include <vtkImageData.h>
#include <vtkImageIterator.h>
#include <vtkImageLuminance.h>
#include <vtkImageStencil.h>
#include <vtkImageStencilData.h>
#include <vtkImageViewer.h>
#include <vtkInteractorStyleImage.h>
#include <vtkPNGReader.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkLine.h>
#include <vtkCamera.h>
STLpoint_vtk7::STLpoint_vtk7(QWidget* parent)
: QMainWindow(parent)
{
ui.setupUi(this);
//test DrawCross
static vtkSmartPointer<vtkActor> _CrossCenterActor = vtkSmartPointer<vtkActor>::New();
double _Pos[3];
_Pos[0] = 0;
_Pos[1] = 0;
_Pos[2] = 0;
_CrossCenterActor = DrawCross(_CrossCenterActor, _Pos);
_CrossCenterActor->SetPosition(0, 0, 1);
m_vtkRenderer = vtkSmartPointer<vtkRenderer>::New();
m_vtkRenderer->AddActor(_CrossCenterActor);
m_vtkRenderer->SetBackground(.0, .0, .0);
vtkSmartPointer<vtkRenderWindow> window = vtkSmartPointer<vtkRenderWindow>::New();
ui.qvtkWidget->SetRenderWindow(window);
ui.qvtkWidget->GetRenderWindow()->AddRenderer(m_vtkRenderer);
}
STLpoint_vtk7::~STLpoint_vtk7()
{}
void STLpoint_vtk7::openFileSlot()
{
QString selectFilePath = QFileDialog::getOpenFileName(this, QString("choose STL file"), QString(""), QString("file(*.stl)"));
if (selectFilePath.isEmpty())
{
ui.textBrowser->append("The address of the STL file you choose is null!");
return;
}
// 原始图像
vtkSmartPointer<vtkSTLReader> reader = vtkSmartPointer<vtkSTLReader>::New();
reader->SetFileName(selectFilePath.toStdString().c_str());
reader->Update();
// 获取图像信息
vtkSmartPointer<vtkPolyData> polyData = reader->GetOutput();
vtkSmartPointer<vtkPoints> points = polyData->GetPoints();
// 计算中心点坐标
double center[3] = { 0.0, 0.0, 0.0 };
for (vtkIdType i = 0; i < points->GetNumberOfPoints(); ++i) {
double point[3];
points->GetPoint(i, point);
for (int j = 0; j < 3; ++j) {
center[j] += point[j];
}
}
for (int j = 0; j < 3; ++j) {
center[j] /= points->GetNumberOfPoints();
}
cout << "The Center of the Picture:" << center[0] << " " << center[1] << " " << center[2] << endl;
//将source转换成mapper
vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(reader->GetOutputPort());
//送入渲染引擎进行显示
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
static vtkSmartPointer<vtkActor> _CrossCenterActor = vtkSmartPointer<vtkActor>::New();
_CrossCenterActor = DrawCross(_CrossCenterActor, center);
_CrossCenterActor->SetPosition(0, 0, 1);
//渲染
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);
renderer->SetBackground(.0, .0, .0);
renderer->AddActor(_CrossCenterActor);
renderer->SetBackground(.0, .0, .0);
//renderer->SetActiveCamera(camera);
//设置渲染窗口
vtkSmartPointer<vtkRenderWindow> window = vtkSmartPointer<vtkRenderWindow>::New();
ui.qvtkWidget->SetRenderWindow(window);
ui.qvtkWidget->GetRenderWindow()->AddRenderer(renderer); //等价于window->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> interactor = ui.qvtkWidget->GetRenderWindow()->GetInteractor();
vtkSmartPointer<PointPickerInteractorStyle> style = vtkSmartPointer<PointPickerInteractorStyle>::New();
style->SetDefaultRenderer(renderer);
interactor->SetInteractorStyle(style);
interactor->Initialize();
//ok
ui.textBrowser->append(QString("upload the file:") + selectFilePath + QString(" succeed !"));
}
vtkSmartPointer<vtkActor> STLpoint_vtk7::DrawCross(vtkSmartPointer<vtkActor> _Actor, double _Pos[3])
{
if (_Actor == nullptr)
{
_Actor = vtkSmartPointer<vtkActor>::New();
}
vtkSmartPointer<vtkPoints> _Points = vtkSmartPointer<vtkPoints>::New();
_Points->InsertNextPoint(_Pos[0] - 100, _Pos[1], _Pos[2]);
_Points->InsertNextPoint(_Pos[0] + 100, _Pos[1], _Pos[2]);
_Points->InsertNextPoint(_Pos[0], _Pos[1] - 100, _Pos[2]);
_Points->InsertNextPoint(_Pos[0], _Pos[1] + 100, _Pos[2]);
_Points->InsertNextPoint(_Pos[0], _Pos[1], _Pos[2] - 100);
_Points->InsertNextPoint(_Pos[0], _Pos[1], _Pos[2] + 100);
vtkSmartPointer<vtkLine> _Line0 = vtkSmartPointer<vtkLine>::New();
_Line0->GetPointIds()->SetId(0, 0);
_Line0->GetPointIds()->SetId(1, 1);
vtkSmartPointer<vtkLine> _Line1 = vtkSmartPointer<vtkLine>::New();
_Line1->GetPointIds()->SetId(0, 2);
_Line1->GetPointIds()->SetId(1, 3);
vtkSmartPointer<vtkLine> _Line2 = vtkSmartPointer<vtkLine>::New();
_Line2->GetPointIds()->SetId(0, 4);
_Line2->GetPointIds()->SetId(1, 5);
vtkSmartPointer<vtkCellArray> _Lines = vtkSmartPointer<vtkCellArray>::New();
_Lines->InsertNextCell(_Line0);
_Lines->InsertNextCell(_Line1);
_Lines->InsertNextCell(_Line2);
vtkSmartPointer<vtkPolyData> _PolyData = vtkSmartPointer<vtkPolyData>::New();
_PolyData->SetPoints(_Points);
_PolyData->SetLines(_Lines);
vtkSmartPointer<vtkPolyDataMapper> _Mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
_Mapper->SetInputData(_PolyData);
vtkSmartPointer<vtkProperty> lineProperty = vtkSmartPointer<vtkProperty>::New();
lineProperty->SetLineWidth(1.0); // 设置线宽为 1,可以根据需要调整
_Actor->SetMapper(_Mapper);
_Actor->SetProperty(lineProperty);
_Actor->GetProperty()->SetColor(1.0, 0.0, 0.0);
return _Actor;
}
qvtkWidget上显示STL三维图像并取点
如果按照我的步骤一步一步搭好项目就会发现一个问题:我这么写代码确实可以正常取点,但是我想移动旋转我的.stl图像时也会按鼠标左键,这时候也会出现红色标注球,但这时候我只是想移动转动图像,不想取这个点。
我暂时也没想到什么好办法,就在自定义的交互器样式中添加一个状态标记Ctrl来决定是否应该在点击时放置一个球形标记。最后可以通过按下Ctrl来切换这个状态。
class PointPickerInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static PointPickerInteractorStyle* New();
vtkTypeMacro(PointPickerInteractorStyle, vtkInteractorStyleTrackballCamera);
PointPickerInteractorStyle() : PlaceMarker(false) {}
virtual void OnLeftButtonDown()
{
// 检查是否按下了Ctrl键
if (this->Interactor->GetControlKey()) {
PlaceMarker = !PlaceMarker; // 切换放置标记的状态
if (!PlaceMarker) {
// 如果现在不放置标记,直接返回,不执行后面的代码
return;
}
}
if (PlaceMarker) {
//打印鼠标左键像素位置
std::cout << "Picking pixel: " << this->Interactor->GetEventPosition()[0]
<< " " << this->Interactor->GetEventPosition()[1] << std::endl;
//注册拾取点函数
this->Interactor->GetPicker()->Pick(
this->Interactor->GetEventPosition()[0],
this->Interactor->GetEventPosition()[1], 0, // always zero.
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()
);
//打印拾取点空间位置
double picked[3];
this->Interactor->GetPicker()->GetPickPosition(picked);
std::cout << "Picked value: " << picked[0] << " " << picked[1] << " " << picked[2] << std::endl;
//对拾取点进行标记
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->SetPosition(picked);
actor->SetScale(5);
actor->GetProperty()->SetColor(1.0, 0, 0);
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actor);
}
vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
}
void SetPlaceMarker(bool place) {
PlaceMarker = place;
}
bool GetPlaceMarker() {
return PlaceMarker;
}
private:
bool PlaceMarker; // 控制是否放置标记的状态
};
不过我运行起来感觉还是不大灵便,需要按住ctrl键再加上左边鼠标键点一下才能切换成功。。。这步骤让人脑阔疼,如果有朋友有优化这个地方的方法,能在评论区说说不TAT
文章浏览阅读1k次。通过使用ajax方法跨域请求是浏览器所不允许的,浏览器出于安全考虑是禁止的。警告信息如下:不过jQuery对跨域问题也有解决方案,使用jsonp的方式解决,方法如下:$.ajax({ async:false, url: 'http://www.mysite.com/demo.do', // 跨域URL ty..._nginx不停的xhr
文章浏览阅读2k次。关于在 Oracle 中配置 extproc 以访问 ST_Geometry,也就是我们所说的 使用空间SQL 的方法,官方文档链接如下。http://desktop.arcgis.com/zh-cn/arcmap/latest/manage-data/gdbs-in-oracle/configure-oracle-extproc.htm其实简单总结一下,主要就分为以下几个步骤。..._extproc
文章浏览阅读1.5w次。linux下没有上面的两个函数,需要使用函数 mbstowcs和wcstombsmbstowcs将多字节编码转换为宽字节编码wcstombs将宽字节编码转换为多字节编码这两个函数,转换过程中受到系统编码类型的影响,需要通过设置来设定转换前和转换后的编码类型。通过函数setlocale进行系统编码的设置。linux下输入命名locale -a查看系统支持的编码_linux c++ gbk->utf8
文章浏览阅读750次。今天准备从生产库向测试库进行数据导入,结果在imp导入的时候遇到“ IMP-00009:导出文件异常结束” 错误,google一下,发现可能有如下原因导致imp的数据太大,没有写buffer和commit两个数据库字符集不同从低版本exp的dmp文件,向高版本imp导出的dmp文件出错传输dmp文件时,文件损坏解决办法:imp时指定..._imp-00009导出文件异常结束
文章浏览阅读143次。当下是一个大数据的时代,各个行业都离不开数据的支持。因此,网络爬虫就应运而生。网络爬虫当下最为火热的是Python,Python开发爬虫相对简单,而且功能库相当完善,力压众多开发语言。本次教程我们爬取前程无忧的招聘信息来分析Python程序员需要掌握那些编程技术。首先在谷歌浏览器打开前程无忧的首页,按F12打开浏览器的开发者工具。浏览器开发者工具是用于捕捉网站的请求信息,通过分析请求信息可以了解请..._初级python程序员能力要求
文章浏览阅读7.6k次,点赞2次,收藏6次。@Service标注的bean,类名:ABDemoService查看源码后发现,原来是经过一个特殊处理:当类的名字是以两个或以上的大写字母开头的话,bean的名字会与类名保持一致public class AnnotationBeanNameGenerator implements BeanNameGenerator { private static final String C..._@service beanname
文章浏览阅读6.9w次,点赞73次,收藏463次。1.前序创建#include<stdio.h>#include<string.h>#include<stdlib.h>#include<malloc.h>#include<iostream>#include<stack>#include<queue>using namespace std;typed_二叉树的建立
文章浏览阅读7.1k次。在Asp.net上使用Excel导出功能,如果文件名出现中文,便会以乱码视之。 解决方法: fileName = HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8);_asp.net utf8 导出中文字符乱码
文章浏览阅读2.1k次,点赞4次,收藏23次。第一次实验 词法分析实验报告设计思想词法分析的主要任务是根据文法的词汇表以及对应约定的编码进行一定的识别,找出文件中所有的合法的单词,并给出一定的信息作为最后的结果,用于后续语法分析程序的使用;本实验针对 PL/0 语言 的文法、词汇表编写一个词法分析程序,对于每个单词根据词汇表输出: (单词种类, 单词的值) 二元对。词汇表:种别编码单词符号助记符0beginb..._对pl/0作以下修改扩充。增加单词
文章浏览阅读773次。我在使用adb.exe时遇到了麻烦.我想使用与bash相同的adb.exe shell提示符,所以我决定更改默认的bash二进制文件(当然二进制文件是交叉编译的,一切都很完美)更改bash二进制文件遵循以下顺序> adb remount> adb push bash / system / bin /> adb shell> cd / system / bin> chm..._adb shell mv 权限
文章浏览阅读6.8k次,点赞12次,收藏125次。1. 单目相机标定引言相机标定已经研究多年,标定的算法可以分为基于摄影测量的标定和自标定。其中,应用最为广泛的还是张正友标定法。这是一种简单灵活、高鲁棒性、低成本的相机标定算法。仅需要一台相机和一块平面标定板构建相机标定系统,在标定过程中,相机拍摄多个角度下(至少两个角度,推荐10~20个角度)的标定板图像(相机和标定板都可以移动),即可对相机的内外参数进行标定。下面介绍张氏标定法(以下也这么称呼)的原理。原理相机模型和单应矩阵相机标定,就是对相机的内外参数进行计算的过程,从而得到物体到图像的投影_相机-投影仪标定
文章浏览阅读2.2k次。文章目录Wayland 架构Wayland 渲染Wayland的 硬件支持简 述: 翻译一篇关于和 wayland 有关的技术文章, 其英文标题为Wayland Architecture .Wayland 架构若是想要更好的理解 Wayland 架构及其与 X (X11 or X Window System) 结构;一种很好的方法是将事件从输入设备就开始跟踪, 查看期间所有的屏幕上出现的变化。这就是我们现在对 X 的理解。 内核是从一个输入设备中获取一个事件,并通过 evdev 输入_wayland