功能: 服务端生成完整报告并保护单任务

- 使用 libxlsxwriter 常量内存导出 Excel\n- 增加全局任务占用提示与原始数据持久化\n- 保留运行时任务数据并更新接口文档

third_party/libxlsxwriter_repo/examples/watermark.c

@@ -0,0 +1,26 @@
+/*
+ * An example of adding a worksheet watermark image using libxlsxwriter. This
+ * is based on the method of putting an image in the worksheet header as
+ * suggested in the Microsoft documentation:
+ * https://support.microsoft.com/en-us/office/add-a-watermark-in-excel-a372182a-d733-484e-825c-18ddf3edf009
+ *
+ * Copyright 2014-2021, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("watermark.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+
+    /* Set a worksheet header with the watermark image. */
+    lxw_header_footer_options header_options = {.image_center = "watermark.png"};
+    worksheet_set_header_opt(worksheet, "&C&[Picture]", &header_options);
+
+    workbook_close(workbook);
+
+    return 0;
+}