通常我们编译Qt程序的时候最终会生成exe或dll，这些可执行文件都会有Qt模块的依赖，如果项目一旦庞大，就不是很好看出缺了什么模块，导致安装包安装到其他绿色干净的windows机器上会提示缺少XXXQt.等之类的依赖，
以前项目不大的时候，我通常会用windows上一个叫depends的工具来检查可执行文件的依赖，但是项目依赖依赖得多，这个工具却不能完整找出一些跨平台的依赖，比如Qt在platforms目录下提供的各种dll组件，如果缺了它们，
那么在其他绿色干净的windows会报错，程序不能正常启动，而这些依赖depends是检测不出来的。所以需要用Qt官方提供的依赖部署工具，这个工具叫：windeployqt.exe
以下就是该工具的用法，只要使用它的命令行，它就可以分析依赖，把相应的依赖拷贝的指定目录下，然后开发人员就可以用相关的打包工具（NSIS等）打包那个目录了
windeployqt.exe --help
Usage: windeployqt.exe [options] [files]
Qt Deploy Tool 5.8.0
The simplest way to use windeployqt is to add the bin directory of your Qt
installation (e.g. <QT_DIRin>) to the PATH variable and then run:
windeployqt <path-to-app-binary>
If ICU, ANGLE, etc. are not in the bin directory, they need to be in the PATH
variable. If your application uses Qt Quick, run:
windeployqt --qmldir <path-to-app-qml-files> <path-to-app-binary>
Options:
-?, -h, --help Displays this help.
-v, --version Displays version information.
--dir <directory> Use directory instead of binary directory.
--libdir <path> Copy libraries to path.
--plugindir <path> Copy plugins to path.
--debug Assume debug binaries.
--release Assume release binaries.
--pdb Deploy .pdb files (MSVC).
--force Force updating files.
--dry-run Simulation mode. Behave normally, but do not
copy/update any files.
--no-plugins Skip plugin deployment.
--no-libraries Skip library deployment.
--qmldir <directory> Scan for QML-imports starting from directory.
--no-quick-import Skip deployment of Qt Quick imports.
--no-translations Skip deployment of translations.
--no-system-d3d-compiler Skip deployment of the system D3D compiler.
--compiler-runtime Deploy compiler runtime (Desktop only).
--no-compiler-runtime Do not deploy compiler runtime (Desktop only).
--webkit2 Deployment of WebKit2 (web process).
--no-webkit2 Skip deployment of WebKit2.
--json Print to stdout in JSON format.
--angle Force deployment of ANGLE.
--no-angle Disable deployment of ANGLE.
--no-opengl-sw Do not deploy the software rasterizer library.
--list <option> Print only the names of the files copied.
Available options:
source: absolute path of the source files
target: absolute path of the target files
relative: paths of the target files, relative
to the target directory
mapping: outputs the source and the relative
target, suitable for use within an
Appx mapping file
--verbose <level> Verbose level.
Qt libraries can be added by passing their name (-xml) or removed by passing
the name prepended by --no- (--no-xml). Available libraries:
bluetooth clucene concurrent core declarative designer designercomponents
enginio gui qthelp multimedia multimediawidgets multimediaquick network nfc
opengl positioning printsupport qml qmltooling quick quickparticles quickwidgets
script scripttools sensors serialport sql svg test webkit webkitwidgets
websockets widgets winextras xml xmlpatterns webenginecore webengine
webenginewidgets 3dcore 3drenderer 3dquick 3dquickrenderer 3dinput geoservices
webchannel texttospeech serialbus
Arguments:
[files] Binaries or directory containing the binary.
references：
http://blog.sina.com.cn/s/blog_66cd08930102w74s.html