backend/vobject.cpp: In function ‘VObject* addGroup(VObject*, const char*)’: backend/vobject.cpp:419: error: invalid conversion from ‘const char*’ to ‘char*’ backend/vobject.cpp: In function ‘void writeEncString(OFile*, const char*, bool)’: backend/vobject.cpp:1111: warning: s...
1.信号的发送者必须是QObject的派生类对象。不然会出现error: invalid conversion from 'XXX*' to 'const QObject*' [-fpermissive]...的错误。 2.回调槽函数的对象必须是QObject的派生类对象。不然会出现error: no matching function for call to 'QObject::connect(XXX*,的错误。这里要注意一点,信号函数无...
我已经将问题简化为以下示例代码: __stdcall void dllFunc() { qDebug() << "test"; } void test() { QtConcurrent::run(dllFunc); } 如果我删除了__stdcall,代码就会编译并正常运行。否则我会得到这些编译错误: error: invalid conversion from 'void (*)()' to 'v 浏览3提问于2013-07-02得票数 ...
之前QChar c = 0xf105 全部要改成强制转换 QChar c = (QChar)0xf105,不再有隐式转换,不然编译报错提示error: conversion from 'int' to 'QChar' is ambiguous 。 qSort等一些函数用回c++的 std::sort 。 #if (QT_VERSION >= QT_VERSION_CHECK(6,0,0))std::sort(ipv4s.begin(),ipv4s.end()...
my QT version is 5.9.7, mac os system error occurs when I compile: sml/smlworkbook.cpp:40:12: error: no viable conversion from returned value of type 'int' to function return type 'QString' return bookViews_raw[0][attribute].toInt(); ^~~...
主要有三种方法可以将str转换为char*类型,分别是:data(); c_str(); copy(); data()方法 string str = "hello"; const char* p = str.data(); //加const 或者用char * p=(char*)str.data();的形式 同时有一点需要说明,这里在devc++中编译需要添加const,否则会报错invalid conversion from const ...
你应该在你的类之外定义你的全局变量，而不是在（类成员）之内。
ghost changed the title Cannot Compile: invalid conversion from ‘char**’ to ‘const char**’ Cannot Compile: ‘Q_NULLPTR’ was not declared in this scope*’ Jan 20, 2017 Collaborator tarmoj commented Jan 20, 2017 via email Thanks for the report, probably needs some condition for Qt ...
C++不允许从基类自动转换（QWidget）到派生类（FirstTab），因为不是所有的QWidget都是FirstTab。所以您...
E:\7_qt_dir\test0813\main.cpp:19: error: invalid conversion from 'const AVOutputFormat*' to 'AVOutputFormat*' [-fpermissive] ..\test0813\main.cpp:19:35: error: invalid conversion from 'const AVOutputFormat*' to 'AVOutputFormat*' [-fpermissive] ... 这个错误是由于在代码中将常量的指针(con...