Xxx.pro learning in QT

1. Determine whether there is this module , Compile if necessary , If nothing, ignore

qtHaveModule(webengine) {

    SUBDIRS += \
        webview
}

2. Specify dependencies

examples.depends = tools support skins qmlexport

3. Use   DEFINES Macro defines the project global switch

4. Specify the build path ：

DESTDIR =  $$PWD/bin/  # Specify where the compiled executable file is generated 
RCC_DIR = $$PWD/target/rcc_target
MOC_DIR =$$PWD/target/moc_target
OBJECTS_DIR = $$PWD/target

5. Copy files before Compilation

win32 {

    src_dir = $$PWD\docs\*.*
    CONFIG(debug, debug|release) {
        dst_dir = $$PWD\\bin\\
    } else {
        dst_dir = $$PWD\\bin\\
    }

    # dst_dir  final  \\  Is a must , Used to mark  xcopy  To a folder , If it does not exist , Created by 

    # Replace slashes in paths with backslashes for Windows
    src_dir ~= s,/,\\,g
    dst_dir ~= s,/,\\,g

    exists($$dst_dir):system(xcopy $$src_dir $$dst_dir /y /e)

}

6.windows Run as an administrator ：

QMAKE_LFLAGS += /MANIFESTUAC:\"level=\'requireAdministrator\' uiAccess=\'false\'\" # Run as an administrator 

7. Pre compile and post compile execution （windows No need make install）

# The guild is in ：G:/Qt/5.15.2/mingw81_64/qml/   establish com/org/example/io Catalog 
uri = com.org.example.io

#CONFIG += qmltypes
#QML_IMPORT_NAME = com.mycompany.messaging
#QML_IMPORT_MAJOR_VERSION = 1

DISTFILES = qmldir

#QMAKE_POST_LINK  Represents what is executed after compilation 
#QMAKE_PRE_LINK  Represents the execution of content before compilation 

# Target directory 
installPath = $$[QT_INSTALL_QML]/$$replace(uri, \., /)/

# Set the output directory of executable files or library files 
DESTDIR = $$installPath

!equals(_PRO_FILE_PWD_, $$OUT_PWD) {


    # Set up the qmldir Copy the file to the file compilation output directory 
    copy_qmldir.target = $$installPath
    copy_qmldir.depends = $$_PRO_FILE_PWD_/qmldir
    copy_qmldir.commands = $(COPY_FILE) "$$replace(copy_qmldir.depends, /, $$QMAKE_DIR_SEP)" "$$replace(copy_qmldir.target, /, $$QMAKE_DIR_SEP)"
    QMAKE_EXTRA_TARGETS += copy_qmldir
    PRE_TARGETDEPS += $$copy_qmldir.target



#    cop_qmldir_system_commands= $(COPY_FILE) "$$replace(copy_qmldir.depends, /, $$QMAKE_DIR_SEP)" "$$replace(installPath, /, $$QMAKE_DIR_SEP)"
#    message($$cop_qmldir_system_commands)
     # Determine whether the directory to be installed exists 
#    !exists($installPath) {
         # non-existent , Create the directory 
#        create_dir_command = $(MKDIR)  "$$replace(installPath, /, $$QMAKE_DIR_SEP)"
         # Execute before compiling 
#        QMAKE_PRE_LINK = $$create_dir_command

#        message("install path is not exists.....")
#    }
     # Execute after compilation 
#    QMAKE_POST_LINK = $$cop_qmldir_system_commands

}
#DISTFILES = qmldir

The execution information of the above example after the project compilation is completed is as follows ：