英文:
No windows appearing when using WxWidgets on MSVC
问题
我在使用WxWidgets时遇到问题，我的代码如下：
#include <wx/wx.h>
#include <iostream>
class MyApp : public wxApp
{
public:
virtual bool OnInit();
};
class MyFrame : public wxFrame
{
public:
MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
};
bool MyApp::OnInit()
{
MyFrame* frame = new MyFrame("Hello World", wxPoint(50, 50), wxSize(450, 340));
frame->Show(true);
return true;
}
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame(NULL, wxID_ANY, title, pos, size)
{
}
wxIMPLEMENT_APP(MyApp);
int main()
{
std::cout << "Hello world, why isn't there a window showing?\n";
}
它编译正常，但除了输出的内容：Hello world, why isn't there a window showing?之外，没有显示任何GUI窗口。如何解决这些错误？
英文:
I am having an issue in using WxWidgets, my code is as follows:
#include <wx/wx.h>
#include <iostream>
class MyApp : public wxApp
{
public:
virtual bool OnInit();
};
class MyFrame : public wxFrame
{
public:
MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
};
bool MyApp::OnInit()
{
MyFrame* frame = new MyFrame("Hello World", wxPoint(50, 50), wxSize(450, 340));
frame->Show(true);
return true;
}
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame(NULL, wxID_ANY, title, pos, size)
{
}
wxIMPLEMENT_APP(MyApp);
int main()
{
std::cout << "Hello world, why isn't there a window showing?\n";
}
It compiles fine, but no window appears except from the output: Hello world, why isn't there a window showing? but it doesn't show any GUI window.
I have been using vcpkg on MSVC to get the WxWidgets, does any one know how I could resolve these errors?
答案1
得分: 2
你正在构建你的应用程序作为一个控制台应用程序（/subsystem:console链接器选项），这意味着它的入口点是main()，而不是构建为Windows应用程序（/subsystem:windows）。你可以这样做，但然后你需要自己调用库的入口点（wxEntry()）。
但除非你有一个很好的理由这样做，如果你使用makefiles或其他方式将其制作为Windows应用程序，你应该只需在IDE/linker选项中更改应用程序类型。然后，你应该完全移除main()，因为它不会被使用 - 而它的缺失不会导致Windows应用程序的链接错误。
英文:
You're building your application as a console application (/subsystem:console linker option), meaning that its entry point is main(), instead of building it as a Windows application (/subsystem:windows). You can do it like this, but then you're responsible for calling the library entry point (wxEntry()) yourself.
But unless you have a good reason to do it like this, you should just change the application type in the IDE/linker option if you use makefiles or something else to make it a Windows application. You should then remove main() entirely as it won't be used -- and its absence won't result in linking errors for a Windows application.
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