We can read and modify existing simple .xlsx file now

examples/xlsx/readwrite/doc/src/readwrite.qdoc

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+/*!
+    \title Xlsx Readwrite Example
+    \example readwrite
+    \brief Open an existing xlsx file, modify and save it.
+
+    \ingroup qtxlsx
+
+    This example demonstrates how to modify an existing
+    .xlsx file with Qt Xlsx Library.
+*/

examples/xlsx/readwrite/main.cpp

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+#include "xlsxdocument.h"
+
+int main()
+{
+    //Generate a simple xlsx file at first.
+    QXlsx::Document xlsx;
+    xlsx.write("A1", "Hello Qt!");
+    xlsx.write("A2", 500);
+    xlsx.saveAs("first.xlsx");
+
+    //Read, edit, save
+    QXlsx::Document xlsx2("first.xlsx");
+    xlsx2.addWorksheet("Second");
+    xlsx2.write("A1", "Hello Qt again!");
+    xlsx2.saveAs("second.xlsx");
+
+    return 0;
+}

examples/xlsx/readwrite/readwrite.pro

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+TARGET = mergecells
+
+#include(../../../src/xlsx/qtxlsx.pri)
+QT += xlsx
+
+TARGET = readwrite
+CONFIG   += console
+CONFIG   -= app_bundle
+
+TEMPLATE = app
+
+SOURCES += main.cpp