在Qt助手（assistant.exe）搜索关键字"Setting the Application Icon"就可以看到在各种平台设置Qt程序图标的方法。
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.rcRegenerate 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.
具体方法：
首先准备个ICO图标。例如：myappico.ico。用记事本新建个文件，里面就写一行：
IDI_ICON1 ICON DISCARDABLE "myappico.ico"
保存改名为 myapp.rc并把它和你的图标myappico.ico一起复制到你的QT工程项目的目录。
用记事本打开你的QT工程文件（如 "myapp.pro" ），在里面最后新添一行
RC_FILE = myapp.rc
保存，编译你的工程，嘿嘿。。成功了吧。。。
