QProcessEnvironment 類保持可以被傳遞給程序的環境變量。 更多...
| 頭： | #include <QProcessEnvironment> |
| qmake: | QT += core |
| Since: | Qt 4.6 |
該類在 Qt 4.6 引入。
注意： 此類的所有函數 可重入 .
| QProcessEnvironment (const QProcessEnvironment & other ) | |
| QProcessEnvironment () | |
| QProcessEnvironment & | operator= (const QProcessEnvironment & other ) |
| ~QProcessEnvironment () | |
| void | clear () |
| bool | contains (const QString & name ) const |
| void | insert (const QString & name , const QString & value ) |
| void | insert (const QProcessEnvironment & e ) |
| bool | isEmpty () const |
| QStringList | keys () const |
| void | remove (const QString & name ) |
| void | swap (QProcessEnvironment & other ) |
| QStringList | toStringList () const |
| QString | value (const QString & name , const QString & defaultValue = QString()) const |
| bool | operator!= (const QProcessEnvironment & other ) const |
| bool | operator== (const QProcessEnvironment & other ) const |
| QProcessEnvironment | systemEnvironment () |
A process's environment is composed of a set of key=value pairs known as environment variables. The QProcessEnvironment class wraps that concept and allows easy manipulation of those variables. It's meant to be used along with QProcess , to set the environment for child processes. It cannot be used to change the current process's environment.
The environment of the calling process can be obtained using QProcessEnvironment::systemEnvironment ().
On Unix systems, the variable names are case-sensitive. Note that the Unix environment allows both variable names and contents to contain arbitrary binary data (except for the NUL character). QProcessEnvironment will preserve such variables, but does not support manipulating variables whose names or values cannot be encoded by the current locale settings (see QTextCodec::codecForLocale ).
On Windows, the variable names are case-insensitive, but case-preserving. QProcessEnvironment behaves accordingly.
另請參閱 QProcess , QProcess::systemEnvironment ()，和 QProcess::setProcessEnvironment ().
Creates a QProcessEnvironment object that is a copy of other .
Creates a new QProcessEnvironment object. This constructor creates an empty environment. If set on a QProcess , this will cause the current environment variables to be removed.
拷貝內容從 other QProcessEnvironment 對象到此對象。
Frees the resources associated with this QProcessEnvironment 對象。
Removes all key=value pairs from this QProcessEnvironment object, making it empty.
另請參閱 isEmpty () 和 systemEnvironment ().
返迴
true
若環境變量名
name
被找到在此
QProcessEnvironment
對象。
插入環境變量按名稱 name 和內容 value 到此 QProcessEnvironment 對象。若變量已經存在，以新值替換它。
在大多數係統，插入沒有內容的變量對應用程序與根本沒有設置變量的效果相同。不管怎樣，為保證不存在不兼容，要移除變量請使用 remove () 函數。
另請參閱 contains (), remove ()，和 value ().
這是重載函數。
插入內容為 e 在此 QProcessEnvironment 對象。在此對象中的變量還存在於 e 會被覆寫。
該函數在 Qt 4.8 引入。
返迴
true
若此
QProcessEnvironment
對象為空：沒有設置 "鍵=值" 對。
另請參閱 clear (), systemEnvironment ()，和 insert ().
返迴包含所有變量名稱的列錶在此 QProcessEnvironment 對象。
該函數在 Qt 4.8 引入。
移除環境變量標識通過 name 從此 QProcessEnvironment 對象。若變量之前不存在，什麼都不發生。
另請參閱 contains (), insert ()，和 value ().
交換此進程環境實例與 other 。此函數非常快且從不失敗。
該函數在 Qt 5.0 引入。
[static]
QProcessEnvironment
QProcessEnvironment::
systemEnvironment
()
The systemEnvironment function returns the environment of the calling process.
它被返迴作為
QProcessEnvironment
. This function does not cache the system environment. Therefore, it's possible to obtain an updated version of the environment if low-level C library functions like
setenv
or
putenv
有被調用。
However, note that repeated calls to this function will recreate the QProcessEnvironment object, which is a non-trivial operation.
該函數在 Qt 4.6 引入。
另請參閱 QProcess::systemEnvironment ().
轉換此 QProcessEnvironment object into a list of strings, one for each environment variable that is set. The environment variable's name and its value are separated by an equal character ('=').
The QStringList contents returned by this function are suitable for presentation. Use with the QProcess::setEnvironment function is not recommended due to potential encoding problems under Unix, and worse performance.
另請參閱 systemEnvironment (), QProcess::systemEnvironment ()，和 QProcess::setProcessEnvironment ().
搜索此 QProcessEnvironment object for a variable identified by name and returns its value. If the variable is not found in this object, then defaultValue 被返迴取而代之。
另請參閱 contains (), insert ()，和 remove ().
返迴
true
若此和
other
QProcessEnvironment
對象不同。
另請參閱 operator== ().
返迴
true
若此和
other
QProcessEnvironment
對象相等。
Two QProcessEnvironment objects are considered equal if they have the same set of key=value pairs. The comparison of keys is done case-sensitive on platforms where the environment is case-sensitive.
另請參閱 operator!= () 和 contains ().