I have a QTreeView and want different background colors for rows, depending on their content. To achieve this, I derived a class MyTreeView from QTreeView and implemented the paint method as follows: void MyTreeView::drawRow (QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const {
我有一个QTreeView并根据其内容需要不同的行背景颜色。 为了达到这个目的，我从QTreeView派生了一个class MyTreeView ， QTreeView如下方式实现了paint方法： void MyTreeView::drawRow (QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const { QStyleOptionViewItem newOption(option); if (s
I want the QtextEdit in my app to be green so I set the stylesheet to background-color: rgb(109, 255, 99); However this also change the background color of the scrollbars and even when I click mouse right button in the textedit the menu that is shown is also green and that is not what I expected. I'm using Qt Designer to design gui and then I used the uic to generate c++ file. in the c+
我希望我的应用中的QtextEdit为绿色，因此我将样式表设置为 background-color: rgb(109, 255, 99); 然而这也改变了滚动条的背景颜色，甚至当我在文本框中单击鼠标右键时，显示的菜单也是绿色的，这不是我所期望的。 我使用Qt Designer来设计gui，然后使用uic来生成c ++文件。 在c ++文件中看起来像这样： textEdit->setAutoFillBackground(false); textEdit->setStyleSheet(QString::fromUtf8("background-color: rg
I am using the latest snapshot build of clang with latest TDM-Gcc headers and libs. When compiling this (using -std=c++11 flag): #include <functional> #include <iostream> class Foo { public: void Bar(int x) { std::cout << x << std::endl; } }; int main() { Foo foo; auto f = std::bind(&Foo::Bar, &foo, 5); f();
我正在使用带有最新TDM-Gcc标头和库的clang的最新快照版本。 编译时（使用-std = c ++ 11标志）： #include <functional> #include <iostream> class Foo { public: void Bar(int x) { std::cout << x << std::endl; } }; int main() { Foo foo; auto f = std::bind(&Foo::Bar, &foo, 5); f(); return 0; } 我收到这些错误： In
How can I change the entire console's background color? I've tried SetConsoleTextAttribute and it only changes the background color of new text. I effectively want the entire console to turn red when a serious error arises. Thanks to everyone who attempts to help. 试试像这样： system("color c2"); I think the FillConsoleOutputAttribute function will do what you need. Set it to the
我怎样才能改变整个控制台的背景颜色？ 我试过SetConsoleTextAttribute ，它只改变了新文本的背景颜色。 当出现严重错误时，我实际上希望整个控制台变为红色。 感谢所有尝试提供帮助的人。 试试像这样： system("color c2"); 我认为FillConsoleOutputAttribute函数会做你需要的。 将其设置为控制台的起始坐标，并将nLength设置为控制台中的字符数（ width * length ）。 BOOL WINAPI FillConsoleOutputAttribute( __in
I looked at some C++ containers (vector, deque, list, map, set) and found that none of them implement erase(reverse_iterator position) There is a way to get iterator from reverse_iterator as described in this answer. But why above containers do not implement the erase member function with reverse_iterator parameter? Is there any significant difference between iterator and reverse_iterator w
我看了一些C ++容器（vector，deque，list，map，set），发现它们都没有实现 erase(reverse_iterator position) 如本答案中所述，有一种方法可以从reverse_iterator获取迭代器。 但是为什么上面的容器不使用reverse_iterator参数实现擦除成员函数呢？ 迭代器和reverse_iterator之间是否存在重大差异，导致这种实现困难或者由于其他原因而未实现？ 几乎所有的容器函数都可以被问到同样的问题：为什么它没有为反向迭代器实
Here's some sample test code I'm trying to run on an embedded Linux system: #include <iostream> int main(int argc, char *argv[]) { char c = 'A'; int i = 7; std::cout << "Hello World from C++" << std::endl; std::cout << "c=" << c << std::endl; std::cout << "i=" << i << std::endl; } The embedded system is a Microb
以下是我试图在嵌入式Linux系统上运行的一些示例测试代码： #include <iostream> int main(int argc, char *argv[]) { char c = 'A'; int i = 7; std::cout << "Hello World from C++" << std::endl; std::cout << "c=" << c << std::endl; std::cout << "i=" << i << std::endl; } 嵌入式系统是Microblaze，它是在Xilinx FPGA上运行的32位RISC
I am experimenting with C++11 features using the GCC compiler. I have discovered that the following code does not compile and I'm not sure why. I was expecting that the type of name would be automatically deduced from the initialisation value. int main() { auto name = ""; cin >> name; // compile error occurs here cout << "Hello " << name << endl; ret
我正在使用GCC编译器试验C ++ 11的功能。 我发现下面的代码不能编译，我不知道为什么。 我期待从初始化值自动推断出这个name的类型。 int main() { auto name = ""; cin >> name; // compile error occurs here cout << "Hello " << name << endl; return 0; } 产生的错误是： 不能绑定'std :: istream {aka std :: basic_istream}'左值为'std :: basic_istream &
I'm reading a tutorial about threads in C++ and tested the following code: #include <iostream> #include <pthread.h> #include <cstdlib> using namespace std; #define NUM_THREADS 5 void *PrintHello(void *threadid) { long tid; tid = (long)threadid; cout << "Hello World! Thread ID, " << tid << endl; pthread_exit(NULL); } int main () { pth
我正在阅读关于C ++中的线程的教程，并测试了以下代码： #include <iostream> #include <pthread.h> #include <cstdlib> using namespace std; #define NUM_THREADS 5 void *PrintHello(void *threadid) { long tid; tid = (long)threadid; cout << "Hello World! Thread ID, " << tid << endl; pthread_exit(NULL); } int main () { pthread_t threads[NUM_THREADS
I have been searching for a long a way to compress, using the zlib library (and the function compress) a struct containing float vars. Every example i saw are showing how to compress a string, specifically a unsigned char*. My struct is an easy one : struct Particle{ float x; float y; float z; }; And I am calling the compress function as below : uLong initSize = sizeof(Particle);
我一直在寻找一种很长的压缩方法，使用zlib库（和函数压缩）包含float vars的结构。 我看到的每个例子都展示了如何压缩一个字符串，特别是一个无符号的char *。 我的结构很简单： 结构体粒子{ float x; 浮动y; float z; }; 我正在调用压缩函数如下： uLong initSize = sizeof（Particle）; uLongf destSize = initSize * 1.1 + 12; Bytef dataOriginal =（Bytef）malloc（initSize）; Bytef dataCompress
I am facing a strange issue, working on my mac osx lion (under xcode4/clang, though it is reproducible with gcc4.2). It seems, that I can not assign any value above 127 for a unsigned char variable. So, when I assign v = (unsigned char) 156; or, simply std::cout << (unsigned char) 231 << std::endl; my program does not produce any output. When I run this code std::cout <&l
我面临一个奇怪的问题，在我的mac osx狮子上工作（在xcode4 / clang下，虽然它可以用gcc4.2重现）。 看来，我无法为无符号字符变量赋值127以上的任何值。 所以，当我分配 v = (unsigned char) 156; 或者简单地说 std::cout << (unsigned char) 231 << std::endl; 我的程序不会产生任何输出。 当我运行这个代码 std::cout << "Unsigned chars range up to " << UCHAR_MAX << std::endl;