Jacob 庫 Dispatch.call 參數類型錯誤解決方案

使用 Jacob 庫操作 Word 時，呼叫 Dispatch.call(selection, "TypeText", "標題") 報錯：The method call(Dispatch, String, Object[]) ... not applicable for the arguments (Dispatch, String, String)。原因是 Dispatch.call 的第三個參數必須是 Object[] 陣列，而非單一 String。

錯誤代碼

Dispatch.call(selection, "TypeText", "標題"); // 編譯錯誤

正確寫法

// 將參數包裝為 Object 陣列
Object[] args = new Object[] { "標題" };
Dispatch.call(selection, "TypeText", args);

完整範例：寫入標題並設定格式

import com.jacob.activeX.ActiveXComponent;
import com.jacob.com.Dispatch;
import com.jacob.com.Variant;

public class WordDemo {
    public static void main(String[] args) {
        ActiveXComponent word = new ActiveXComponent("Word.Application");
        try {
            word.setProperty("Visible", new Variant(true));
            Dispatch documents = word.getProperty("Documents").toDispatch();
            Dispatch doc = Dispatch.call(documents, "Add").toDispatch();
            Dispatch selection = word.getProperty("Selection").toDispatch();

            // 正確呼叫 TypeText
            Dispatch.call(selection, "TypeText", new Object[] { "報告標題" });

            // 設定字型大小、加粗、置中
            Dispatch font = Dispatch.get(selection, "Font").toDispatch();
            Dispatch.put(font, "Size", "24");
            Dispatch.put(font, "Bold", "True");
            Dispatch.put(font, "Name", "微軟正黑體");
            Dispatch alignment = Dispatch.get(selection, "ParagraphFormat").toDispatch();
            Dispatch.put(alignment, "Alignment", "3"); // wdAlignParagraphCenter

            // 儲存並關閉
            Dispatch.call(doc, "SaveAs", new Object[] { "C:/demo.docx" });
            Dispatch.call(doc, "Close", new Object[] { false });
        } finally {
            word.invoke("Quit", new Variant[0]);
        }
    }
}

核心規則

• Dispatch.call(dispatch, methodName, Object[] args)：第三參數必須為 Object[]，即使只有一個參數。
• Dispatch.get/put 用於屬性讀寫，參數為 Variant 或基本類型自動裝箱。
• 所有 COM 物件用完需釋放：Dispatch.call(obj, "Release") 或依賴 Jacob 記憶體管理。

參考資源

更多 Jacob 操作 Word 範例可參考：https://www.myexception.cn/program/781772.html

遵循 Object[] 參數規範，即可避免此類編譯錯誤。