用Qt5写了个生成excel数据的程序，发现生成数据速度很慢，
经查证，
在单元格很多的时候，按单元格写入很慢，按范围批量读写速度快很多，excel部分代码片段如下，
初学者代码不好，另外设置页面和单元格格式有更好具体意见建议者，欢迎留言指导
这段代码生成同一种格式的7页数据，最终结果如下：
void mainwindow::produce_excel()
{
//获取桌面路径，设置为表格的绝对路径
QString excel_file_path = QStandardPaths::writableLocation(QStandardPaths::DesktopLocation)
+ "/baodi.xlsx";
//把"/baodi.xlsx"中//替换成所在系统分隔符，否则路径读取会失败
excel_file_path = QDir::toNativeSeparators(excel_file_path);
QAxObject *excel = new QAxObject(this);
excel->setControl("Excel.Application"); //连接EXCEL控件
excel->setProperty("DisplayAlerts", true); //显示窗体
QAxObject *workbooks = excel->querySubObject("WorkBooks"); // 获取工作薄（EXCEL文件）集合
workbooks->dynamicCall("Add"); //创建新工作薄
//workbooks->dynamicCall("Open(const QString&)", excel_file_path);
QAxObject *workbook = excel->querySubObject("ActiveWorkBook"); //获取当前工作薄
workbook->dynamicCall("SaveAs(const QString&, int, const QString&, const QString&, bool,bool)",
excel_file_path, 51, QString(""),QString(""),false,false);//51xlsx,56xls
QAxObject *worksheet = workbook->querySubObject("WorkSheets(int)", 1);
//根据序号获取EXCEL下方第int张工作表
/*
//按单元格写入，数据多时，速度很慢，真的很慢，十分不推荐，已经注释掉了，按范围写入在后面
QAxObject *usedRange = worksheet->querySubObject("UsedRange"); //sheet范围
int Row = usedRange->property("Row").toInt();// 获得起始行数
int Col = usedRange->property("Column").toInt();//获得起始列数
QAxObject *cell = worksheet->querySubObject("Cells(int,int)", Row, Col);
const int ROW_NUM {30};
const int COL_NUM {3};
const int HIGHT {26};
const int WIDE {10};
long t = 0;//用于选择时间time
for(auto d:day)
{
//输入表头
//auto t = time.begin();
cell->setProperty("Value", d);
cell->setProperty("RowHeight", HIGHT+9);//设置行高
//cell->setProperty("ColumnWidth", WIDE-4); //设置单元格列宽
//cell->setProperty("HorizontalAlignment", -4108);
//左对齐（xlLeft）：-4131 居中（xlCenter）：-4108 右对齐（xlRight）：-4152
cell = worksheet->querySubObject("Cells(int,int)", ++Row, Col);
cell->setProperty("Value", sn);
cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE-4); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
cell->setProperty("Value", time[t++%6]);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
//cell->setProperty("Value", sn);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
cell->setProperty("Value", sn);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE-4); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
cell->setProperty("Value", time[t++%6]);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
//cell->setProperty("Value", sn);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
cell->setProperty("Value", sn);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE-4); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
cell = worksheet->querySubObject("Cells(int,int)", Row, ++Col);
cell->setProperty("Value", time[t++%6]);
//cell->setProperty("RowHeight", HIGHT);
cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
Col = usedRange->property("Column").toInt();//获得起始列数
cell = worksheet->querySubObject("Cells(int,int)", ++Row, Col);
//输入数据
for(int i=0; i<ROW_NUM; i++)
{
for(int j=0; j<COL_NUM; j++)
{
cell = worksheet->querySubObject("Cells(int,int)", Row, Col++);
cell->setProperty("Value", i+1);
cell->setProperty("RowHeight", HIGHT);
//cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
cell = worksheet->querySubObject("Cells(int,int)", Row, Col++);
cell->setProperty("Value", rand());
//cell->setProperty("RowHeight", HIGHT);
// cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
cell = worksheet->querySubObject("Cells(int,int)", Row, Col++);
cell->setProperty("Value", right_model(model));
//cell->setProperty("RowHeight", HIGHT);
//cell->setProperty("ColumnWidth", WIDE); //设置单元格列宽
cell->setProperty("HorizontalAlignment", -4108);
}
Col = usedRange->property("Column").toInt();//获得起始列数
cell = worksheet->querySubObject("Cells(int,int)", ++Row, Col);
}
}
*/
//按范围写入，因为不用重复调用QAxObject，比按单元格写入的方式速度提升巨大
const int HIGHT{26};
const int ROW_NUM {224};
const int COL_NUM {3};
unsigned int d = 0;
unsigned int t = 0;
//以二维数组的形式存储预写入数据
QList<QList<QVariant>>datas;
for(int i=0;i<ROW_NUM;i++)
{
QList<QVariant> rows;
switch (i%32)//确定是第几行
{
case 0 :
rows.append(day[d++]);
for(int k=0;k<COL_NUM*3-1;k++)
{
//该方法必须输入整个矩形区域，空的地方不输入最后写入结果会异常
rows.append("");
}
break; // 确定是第几篇报文
case 1 :
for(int k=0;k<COL_NUM;k++)
{
rows.append(sn);
rows.append(time[t++%6]);
rows.append("");
}
break;
default:
for(int k=0;k<COL_NUM;k++)
{
rows.append(i%32? i%32-1 : 30);
rows.append(rand());
rows.append(right_model(model));
}
break;
}
datas.append(rows);
}
/*
*QVariant封装绝大多数Qt提供的数据类型，只要放入和取出类型对应即可，
* 相当于一个普遍的类型联合，
* canConvert可以查询是否能转换当前类型，转换类型以toT()命名
* 以下为类型list<list<qvariant>>到qvariant的转换过程
* 待写入区域内，每行存为一个QList<QVariant>,
* tjgcQList<QVariant> row1,row2,row3;
* 将QList<QVariant> 转换为QVariant类型，
* QVariant r1(row1),r2(row2),r3(row3);
* 整个写入区域当作一个QList<QVariant>,存入上述QVariant类型r1,r2,r3
* 得到QList<QVariant> r
* 整个写入区域从QList<QVariant>转换为QVariant类型
* QVariant v(r); *
*/
//二维数组转一维
QList<QVariant> vars;
for(auto v:datas)
{
vars.append(QVariant(v));
}
//一维数组转变量
QVariant var = QVariant(vars);
QAxObject *user_range = worksheet->querySubObject("Range(const QString&)", "A1:I224");//指定范围
user_range->setProperty("Value", var);//调用一次QAxObject即可完成写入
user_range->setProperty("RowHeight", HIGHT);//设置行高
user_range->setProperty("HorizontalAlignment", -4108);
//左对齐（xlLeft）：-4131 居中（xlCenter）：-4108 右对齐（xlRight）：-4152
workbook->dynamicCall("Save()"); //保存文件
workbook->dynamicCall("Close(Boolean)", false);
excel->dynamicCall("Quit(void)"); //EXE结束前需要关闭EXCEL
delete excel;
//wait->close();
//delete wait;
QMessageBox::information(this,tr("注意"),QStringLiteral("报底已保存在桌面"),QMessageBox::Ok);
}
