error: 'SIGNAL' was not declared in this scope 未在此范围内声明。 connect(ui->Btnshowhello,SIGNAL(clicked(bool),this,SLOT(BtnshowhelloSlot())); 其他错误导致的此报错。。 是SIGNAL后括号忘了。
QT Widget.cpp重新命名、报错“xxxx“ was not declared in this scope,程序员大本营,技术文章内容聚合第一站。
./ui_logindialog.h:150: error: 'class QLineEdit' has no member named 'setPlaceholderText' ./ui_logindialog.h:151: error: 'class QLineEdit' has no member named 'setPlaceholderText' ./ui_logindialog.h:155: error: 'class QLineEdit' has no member named 'setPlaceholderText' 其原因是例子中...
创建了一个有界面的QT Widget 程序,代码如图,虽然简单,但有几点需要主要注意的地方: 1 代码第8行,一定要#include “mainwindow.h”; 否则提示 'MainWindow' was not declared in this scope 2代码第8行,若写为MainWindow w; 则运行结果为与mainwindow.ui 相联系; 若写为 Qt网络应用---socket通信例子 (...
2、在ui界面修改了类的成员名,保存了以后.cpp里调用,成员名还是不更新? solution:尝试改完以后编译执行,成员名就更新了,所以建议成员名什么的一开始就改好固定了,后面省的改得麻烦。。。 3、error: 'Qfont' was not declared in this scope,很明显的错误,'QFont' not 'Qfont' ,却容易找半天找不出来 ...
However, attempting to compile 0.9.3 results in: src/documentpage.cpp: In member function ‘void DocumentPage::updateCabbageText()’: src/documentpage.cpp:714:24: error: ‘Q_NULLPTR’ was not declared in this scope QMessageBox::warning(Q_NULLPTR, tr("No widgets"), tr("There are no ...
D:\Opencv\opencv\opencv\sources\modules\photo\test\test_hdr.cpp:133:39: error: 'time' was not declared in this scope srand(static_cast(time(0))); ^ modules\photo\CMakeFiles\opencv_test_photo.dir\build.make:165: recipe for target 'modules/photo/CMakeFiles/opencv_test_photo.dir/test/te...
Note这里有个error, '_strtoui64' was not declared in this scope, 是作者在修VS2012的bug时introduce的, 只要找到json_scanner.cc, 把strtoll和strtoull两个宏注释掉就行; 3. 在Qt项目中引入QJSN的library, QJSON对QtCore有dependency. LIBS += -L"PathToQJSONLib" -l"qjson" ...
‘UINT64_C’ was not declared in this scope error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS D:\Documents\FFMpeg\dev\include\libavutil\common.h:205: error: 'UINT64_C' was not declared in this scope if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int...
‘nullptr’ wasnotdeclared inthisscope 可以在Cmake配置中,将 ENABLE_CXX11 打开,然后重新编译可以解决。 编译成功后,将编译生成的库添加到系统环境变量中,在Path中增加(根据自己的编译路径) D:\OpenCV\build-Qt\install\x86\mingw\bin 测试Qt+OpenCV环境 ...