在Qt助手（assistant.exe）搜索關鍵字"Setting the Application Icon"就可以看到在各種平臺設置Qt程序圖標的方法。

Setting the Application Icon on Windows：
First, create an ICO format bitmap file that contains the icon image. This can be done with e.g. Microsoft Visual C++: Select File|New, then select the File tab in the dialog that appears, and choose Icon. (Note that you do not need to load your application into Visual C++; here we are only using the icon editor.)
Store the ICO file in your application's source code directory, for example, with the name myappico.ico. Then, create a text file called, say, myapp.rc in which you put a single line of text:
???????? IDI_ICON1?????????????? ICON??? DISCARDABLE???? "myappico.ico"
Finally, assuming you are using qmake to generate your makefiles, add this line to your myapp.pro file:
???????? RC_FILE = myapp.rc
Regenerate your makefile and your application. The .exe file will now be represented with your icon in Explorer.
If you do not use qmake, the necessary steps are: first, run the rc program on the .rc file, then link your application with the resulting .res file.
在VC下RC_FILE = myapp.rc這步操作可以省略。再將這個rc文件加入到VC++的項目中，然后設置它的<配置屬性|資源|常規|預處理器定義>為如下：
“_WINDOWS, UNICODE, WIN32, QT_LARGEFILE_SUPPORT, QT_DLL, QT_WEBKIT_LIB, QT_XML_LIB,
QT_GUI_LIB, QT_NETWORK_LIB, QT_CORE_LIB, QT_THREAD_SUPPORT, _DEBUG”（ 這些參數的設置視情況而定）
然后編譯這個*.rc文件，再編譯vc項目。

轉載于:https://www.cnblogs.com/codespy/archive/2008/09/05/1285073.html

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