[英]C++/Qt Threads error without using threads
我正在使用一種特殊形式的qt框架,它將看起來有些復雜。 不過別擔心。 它與qt的原始框架相同。 (不,我無法更改)
該程序的目的是從ui的tableview
加載表格。 tableview
行和文本應與目錄中的文件一樣多。 我將目錄中的所有文件都放入並對其進行過濾。 此后僅計數並使用所選擇的一個。
現在要解決我的問題:我想像Excel表格一樣顯示表格:它應該突出顯示光標所在的單元格(在我的示例中是上下浮動的計數器)(當前我沒有光標) ,因此我必須使用自行創建的“光標”。您將在程序中看到我的意思)。 我使用QStandardItemModel
進行顯示,並使用QStandardItem
進行定義。 因為我想更改單元格的顏色,所以我使用了QStandardItem
數組來逐一保存單元格。
form.h:
#ifndef FORM_H
#define FORM_H
#include <QWidget>
#include <QTextTable>
#include <QFont>
#include <QFile>
#include <QDir>
#include <QTextStream>
#include <QString>
#include <QStringList>
#include <QStandardItemModel>
#include <QStandardItem>
#include <QBrush>
namespace Ui {
class Form;
}
class Form : public QWidget
{
Q_OBJECT
public:
explicit Form(QWidget *parent = 0);
~Form();
void my_setCFGFromDirectory();
void my_Highlighted(int, bool);
void my_loadCFG(int);
private:
Ui::Form *ui;
QFile file;
QTextStream textstream;
QDir directory;
QString filename;
QStringList stringlist;
QStringList filter;
QStandardItemModel *model;
QStandardItem *tableitem;
QStandardItem* pointerTableitem[];
int max_files;
int w_counter;
bool check1;
bool check2;
bool check3;
};
#endif // FORM_H
和form.cpp
#include "form.h"
#include "ui_form.h"
#include "rbobject.h"
Form::Form(QWidget *parent) :
QWidget(parent),
ui(new Ui::Form)
{
ui->setupUi(this);
}
Form::~Form()
{
delete ui;
}
void Form::my_Highlighted(int actual_count, bool modus){
if(modus == 1){
w_counter = 0;
while(w_counter < max_files){
if(w_counter == actual_count){
pointerTableitem[w_counter]->setBackground(QBrush(QColor(130,180,255)));
}
w_counter++;
}
}
else
{
w_counter = 0;
while(w_counter < max_files){
pointerTableitem[w_counter]->setBackground(QBrush(QColor(255,255,255)));
w_counter++;
}
}
}
void Form::my_setCFGFromDirectory(){
directory.setPath("/etc/rosenbauer/CFG-Files");
filter << "*_CFG.ini";
stringlist = directory.entryList(filter); //takes the selected files and wriths them in a filelist
max_files = stringlist.count(); //Counts the selected files
pointerTableitem [max_files];
memset(pointerTableitem, 0, max_files*sizeof(int)); //The compiler can not see how many elements should be in the array at the time he constructs the array.
//So you have to use this to tell the compiler, how many elements it should create
model = new QStandardItemModel(max_files, 1, this); //Rows , Columns , this
model->setHorizontalHeaderItem(0, new QStandardItem(QString("CFG-Files"))); //Column , QStandarditem...name
for(w_counter = 0; w_counter != max_files; w_counter++){
tableitem = new QStandardItem();
tableitem->setBackground(QBrush(QColor(255,255,255)));
tableitem->setText(QString(stringlist[w_counter])); //Wriths text in the cell
qDebug() << tableitem->text();
pointerTableitem[w_counter] = tableitem; //Stacks the tableitems in a filelist
model->setItem(w_counter, 0, tableitem); //Row, Column , tableitem...text
}
w_counter = 0;
//pointerTableitem[2]->setBackground(QBrush(QColor(130,180,255))); //Test
ui->TableConfig->setModel(model); //Sets the table into the UI
}
void Form::my_loadCFG(int file_position){
check1 = 0;
check2 = 0;
directory.setPath("/etc/rosenbauer/etc/rosenbauer");
check1 = directory.remove("SA008_890560-001_CFG.ini");
check2 = directory.remove("reparsed/SA008_890560-001_CFG.ini_reparsed");
if(check1 && check2){
filename = pointerTableitem[file_position]->text();
check3 = QFile::copy("/etc/rosenbauer/CFG-Files/"+filename, "/etc/rosenbauer/SA008_890560-001_CFG.ini");
if(!check3){
qDebug() << "Error! Could not copy new CFG-file into directory";
}
}
else
{
qDebug() << "Error! Could not delete running CFG-file(s) from directory";
}
}
主頭文件rbobject45000.h
#ifndef RbObject45000_H
#define RbObject45000_H
#include "rbobject.h"
#include "form.h"
class RbObject45000 : public RbObject{
public:
RbObject45000();
RbObject45000(qint32 rbObjectId, RDataObject *dataobject, qint32 style, QObject *parent = 0);
RbObject45000(qint32 rbObjectId, qint32 style, qint32 prio, QObject *parent);
bool entered_ui;
bool entered_key;
short counter;
short w_count;
short delay_count;
short max_files;
short begin;
short end;
Form *f;
void exec();
~RbObject45000();
};
#endif // RbObject45000_H
這是主要的:rbobject45000.cpp
RbObject45000::RbObject45000(qint32 rbObjectId, qint32 style, qint32 prio, QObject *parent):
RbObject(rbObjectId, style, prio, parent){
entered_ui = 0;
entered_key = 0;
counter = 0;
w_count = 1; //... whilecounter
delay_count = 0; //... delay for the deadtime
max_files = 0;
begin = 0;
end = 0;
f= new Form(); //f...name of the displayed UI
}
void RbObject45000::exec(){
//Opens the file on the display
if(getKey(RB_KEY_9) && getKey(RB_KEY_7) && entered_ui ==0){
f->show();
entered_ui = 1;
// Geting the Files from Directory
f->my_setCFGFromDirectory();
}
// Prescind them file in the table
if(entered_ui == 1 && delay_count == 2){
if(getKey(RB_KEY_7)){
counter--;
entered_key = 1;
if(counter < 0){
counter = 0;
}
}
else if(getKey(RB_KEY_9)){
counter++;
entered_key = 1;
if(counter > max_files){
counter = max_files;
}
}
if(entered_key == 1){
while(w_count <= max_files){
f->my_Highlighted(w_count, 0); //Cell , not highlighted
w_count++;
}
w_count = 0;
f->my_Highlighted(counter,1); //Cell , highlighted
entered_key = 0;
}
delay_count = 0;
}
else if(delay_count == 2){ //if delay == 2 and nobody hit a button
delay_count = 0;
}
delay_count++;
//Load the coosen file as programm-config in
if(entered_ui == 1){
if(getKey(RB_KEY_8)){
f->my_loadCFG(counter);
}
}
}
(RB_KEY_7-9是硬件模塊的按鈕,只需單擊它們即可)。因此,如果我這樣做,程序將編譯並啟動。 如果我按下按鈕,並且程序運行到my_setCFGFromDirectory()
則它將退出窗口並停止運行,但是如果在my_setCFGFromDirectory()
聲明了QStandardItem pointerTableitem
則一切正常(但pointerTableitem
必須為private
)。
我得到的錯誤是:
QObject: Cannot create children for a parent that is in a different thread.
(Parent is Form(0x167498), parent's thread is QThread(0x1414e8), current thread is QThread(0x15d2d8)
Segmentation fault
看來我在使用線程(我確定不使用)。 但是我知道它與pointerTableitem
以及標頭和cpp中的聲明有關。
如果我沒記錯的話,問題就出在這里:
model = new QStandardItemModel(max_files, 1, this);
您嘗試創建一個QStandardItemModel
作為父級傳遞this
Form
實例,該表單是在主線程上創建的,此調用顯然發生在另一個線程上(您所做的編輯不夠,還不清楚RbObject
繼承QThread
但是您可以檢查一下自己),然后顯示錯誤消息。
為什么不在主線程上調用該函數? 而不是這樣做
f->show();
entered_ui = 1;
// Geting the Files from Directory
f->my_setCFGFromDirectory();
在另一個線程中,為Form
類創建一個插槽/信號對,將此代碼放入插槽中,並觸發來自RbObject45000::exec()
的連接信號。 從非UI trhead執行UI操作是不正確的。
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