How to export qt data into txt fileIn Qt, you can export the data to a txt-file in the following ways:
1. ** Including related classes and header files **: In the header file (.h file) of the code, you need to include related classes, such as `Qfile`,`QText Stream`, etc. For example,`#include<QFile>`,`#include<QTextStream>`, etc. These classes can perform convenient read and write operations on IOs,`QString`,`QByteArray`, etc.
2. ** define a function to implement the export function **:
- In the class definition, define a function to export txt-files, such as `bool exportTxe (QString fileName, QDate start, QDate end)`(The parameters here can be adjusted according to actual needs).
- Inside the function:
- First, create a `Qfile` object and open the file, such as `Qfile f(fileName); if(! f.open (QIODevice::WriteOnly| QIODevice::Text)){return false;}`, open the file in write only and text mode. If the file fails to open,`false`will be returned.
- Then, create a `QText Stream` object to associate with the file, such as `QText Stream txtOutput(&f);`.
- He could write some necessary information into the file, such as the time range. If the start time is empty, the end time can be written in a specific format; if the start time is not empty, the range from the start time to the end time can be written in a specific format.
- Then, the data was written in a loop according to the actual data source. For example, obtaining data from the database, searching the result set in a loop, processing the data according to a certain format, and then writing it into a file. For time-type data, it may be necessary to format it (for example,`result += value.toDateTime().toString("yy-MM-dd hh:mm:ss").trimmed(). toUtf8 ();`). For special processing of specific tables and fields (for example, special processing when the database field type is `image`, and ordinary Chinese characters are used for coding, etc.), each value can be distinguished by a specific mark. After each line of data is written, the line will change (`txtOutput << result << endl;`).
- Finally, write a special mark to indicate the end of the data (such as `txtOutput << "yangEnd" << endl;`) and close the file (`f.flush(); f.close();`).
3. ** To export a txt-file from the Qtextedit window (one method)**:
- The header file contains `QFile',` QText Stream `,` QFiledDialo `and other related header files.
- In the `cpp 'file, when you click a button (such as the`on_savetext_recv_clicked`function), first select the save path, and use` QFiledrogue:: getOpen <anno data-annotation-id ="000000f4 - 4000 - 4000 - 4000 - 8000 - 800000000000"> FiledName </anno> to obtain the save path.
- Create a `Qfile` object and open the file. If the file fails to open, a warning message will pop up and the system will return.
- Create a `QText Stream` object and associate it with a file. Write the text in the `QText edit` window (such as `ui->text_recv->toPlainText()`) into the file.
4. ** During the execution of the program, you can print the log to export a txt-file (another method)**:
- First, define the string content to be written into the log file (for example,`QString strLog = "`"), and then combine the relevant data into a string according to a certain format (for example, combining the sent and received data in the hex format).
- Then, call a function (such as the `SaveLogTxy` function) to save the log to a txt-file.
- Inside the `SaveLogTxe` function:
- Obtain the current date and time, and determine the path to save the file (for example, under the absolute path of the program.Exe, name the file according to the date, such as `QCoreApp:: applyDirPath ()+ strDate +"log.txt'`).
- Open the file (Open `Qfile file(strPath) in Append mode; bool isOK =file.open>| QIODevice::Append);`)。
- Create a `QText Stream` object and associate it with the file, write the date, time, and log content, and close the file.
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How do I change the extension of a txt file to zip?If.txt is not displayed later, you can check it through Tools-folder options in the window menu: Advanced settings: (Hide the extension of known files): Remove the tick, and then change the.txt extension to.zip. Or you can download and install the winrar or winzip software, right-click the txt file, select add to the compressed folder, and then click OK to complete the conversion of the txt file to a zip file (essentially compressing the txt file into zip format).
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