Qt运行报错QWidget: Must construct a QApplication before a QWidget
报错文件为widget.cpp,原代码如下:
#include <memory>
QLineEdit *frequency = new QLineEdit();
QComboBox *cbBox_method = new QComboBox();
QLineEdit *X_MAXvalue = new QLineEdit();
QLineEdit *Y_MAXvalue = new QLineEdit();
QLineEdit *X_MINvalue = new QLineEdit();
QLineEdit *Y_MINvalue = new QLineEdit();
QLineEdit *X_average = new QLineEdit();
QLineEdit *Y_average = new QLineEdit();
char fileName[256];
FILE *fp=NULL;
int k;
unsigned short fileBuf[1024];
int32 bFileHeaderSize=0;
int32 byteSize=0;
int32 historyFileLen=0;
double voltData[1024];
int32 pointsFetched=0;
int32 chunksFetched=0;
std::deque<double>datadeque;
double voltage;
int buff_busy=0;
Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{
ui->setupUi(this);
}
问题在于,QObject变量是基于UI的变量,不能在Widget出现之前定义,应该定义在Widget之后
原文地址:https://blog.csdn.net/m0_63564748/article/details/142845010
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