我正在使用 Qt 构建一个 C++ 应用程序，以从以 3000Hz 运行的线扫描相机获取数据。在另一个问题（Using C++ to interface with a line-scan camera at 3000Hz, and process/display the data）中，我收到了很好的建议，因为我计划了我的策略来解决这个问题。我现在有一个具体的问题。我将重申我的免责声明：我是一名工程师，而不是程序员……但我正在边做边学。
我正在使用 aQThread不断地将数据采集到QVector. 我将QVector发送到主 GUI 线程，该线程创建 aQRunnable并将其传递给 aQThreadPool以处理数据块。通过这种方式，我计划获取数据块并创建任务来“实时”处理和响应这些数据块。为了简单地让所有部分运行和编译，我最初使用单个整数值作为有效负载。我可以在 中不断生成一个随机int，QThread发送到 GUI 线程，创建一个QRunnable并在线程池中对int进行操作。我为此感到自豪。但是，我无法让它与QVector. 我遇到了几个编译错误，包括：
main.cpp:12:5: error: use of undeclared identifier 'qRegisterMetaType'
qRegisterMetaType<QVector<unsigned short> >("QVector<unsigned short>");
main.cpp:12:47: error: expected '(' for function-style cast or type construction
qRegisterMetaType<QVector<unsigned short> >("QVector<unsigned short>")
**编辑：上述错误显然是由于#include <QMetaType>main.cpp 中的缺失。结合下面所有评论/答案中的信息，可以编译代码。**
由于我真的在这里游泳，所以我现在只是盲目地摆弄代码，试图破译错误消息并尝试不同的事情。以下是构成该项目的所有单个文件。 请注意，首先是我尝试实现 QVector 有效负载的所有代码，我注释掉了适用于int类型的代码位。寻找“//适用于int类型！” 我知道这是一篇很长的帖子，但我不知道如何进一步简化 MWE 并仍然说明我的问题，因为我不知道 QVector 的问题从哪里开始......因此所有文件。我希望它强调我真的试图让它发挥作用。
主文件
#include <QApplication>
#include <QMetaType> // Added based on comments provided on SO
#include "appwidget.h"
int main(int argc, char* argv[]) {
QApplication app(argc, argv);
AppWidget gui;
gui.show();
qRegisterMetaType<QVector<unsigned short> >("QVector<unsigned short>");
return app.exec();
}
应用小部件.h
#ifndef APPWIDGET_H
#define APPWIDGET_H
#include <QWidget>
#include <QThreadPool>
#include "acquire.h"
#include "algorithm.h"
class AppWidget : public QWidget
{ Q_OBJECT
public:
AppWidget(QWidget *parent = 0);
protected:
Acquire thread;
Algorithm task;
private slots:
//void processBlock(int); // works with type int!
void processBlock(const QVector<unsigned short>);
};
#endif
应用小部件.cpp
#include <QtGui>
#include <iostream>
#include "appwidget.h"
AppWidget::AppWidget(QWidget *parent)
: QWidget(parent), task({0}) //task(0)
{
thread.liftoff();
//connect(&thread, SIGNAL(blockAcquired(int)), this, SLOT(processBlock(int))); // works with type int!
connect(&thread, SIGNAL(blockAcquired(const QVector<unsigned short>)), this, SLOT(processBlock(const QVector<unsigned short>)));
setWindowTitle(tr("TestApp"));
resize(550, 400);
}
//void AppWidget::processBlock(int slot_arg) // works with type int!
void AppWidget::processBlock(const QVector<unsigned short> slot_arg)
{
std::cout << "GUI: received signal: " << &slot_arg << std::endl;
Algorithm *task = new Algorithm(slot_arg);
QThreadPool::globalInstance()->start(task);
}
获取.h
#ifndef ACQUIRE_H
#define ACQUIRE_H
#include <QVector>
#include <QMutex>
#include <QThread>
#include <QWaitCondition>
class Acquire : public QThread {
Q_OBJECT
public:
Acquire(QObject *parent = 0);
~Acquire();
void liftoff();
signals:
//void blockAcquired(int); // works with type int!
void blockAcquired(const QVector<unsigned short>);
protected:
void run();
private:
QVector<unsigned short> image_buffer;
QMutex mutex;
QWaitCondition condition;
};
#endif
获取.cpp
#include <iostream>
#include <time.h>
#include <stdlib.h>
#include "acquire.h"
Acquire::Acquire(QObject *parent)
: QThread(parent)
{
}
Acquire::~Acquire()
{
std::cout << "Acquire thread: dying." << std::endl;
wait();
}
void Acquire::liftoff()
{
std::cout << "Acquire thread: init." << std::endl;
start();
}
void Acquire::run()
{
//int image_buffer; // works with type int!
QVector<unsigned short> image_buffer(384 * sizeof(unsigned short) * 192);
forever {
/* // works with type int!
image_buffer = rand() % (int)(65535 - 0 + 1);
nanosleep((struct timespec[]){{0, 800000*192}}, NULL);
*/
int k=0;
for (int i=0; i<384; i++) {
for (int j=0; j<192; j++) {
image_buffer[k] = 0 + (rand() % (int)(65535 - 0 + 1));
k++;
}
nanosleep((struct timespec[]){{0, 800000}}, NULL);
}
//std::cout << "Acquire thread: block acquired: " << image_buffer << std::endl; // works with type int!
std::cout << "Acquire thread: block acquired: " << &image_buffer << std::endl;
//emit blockAcquired(image_buffer); // works with type int!
emit blockAcquired(image_buffer);
}
}
算法.h
#ifndef ALGORITHM_H
#define ALGORITHM_H
#include <QRunnable>
#include <QThread>
#include <QVector>
class Algorithm : public QObject, public QRunnable
{
Q_OBJECT
public:
//Algorithm(int); // works with type int!
Algorithm(const QVector<unsigned short>);
~Algorithm();
//int arg_passed; // works with type int!
const QVector<unsigned short> arg_passed;
protected:
void run();
};
#endif
算法.cpp
#include <iostream>
#include "algorithm.h"
//Algorithm::Algorithm(int i) // works with type int!
Algorithm::Algorithm(const QVector<unsigned short> arg_passed)
{
// arg_passed = i; // works with type int!
std::cout << "Algorithm: init." << std::endl;
}
Algorithm::~Algorithm()
{
std::cout << "Algorithm: dying." << std::endl;
}
void Algorithm::run()
{
std::cout << "Algorithm: running, " << QThread::currentThread() << std::endl;
std::cout << "Arg: " << arg_passed << std::endl;
}