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问题 I'm trying to make a C++ class using the Code::Blocks IDE and there is a field called "Guard block." I've done a search and haven't been able to find any useful information. What is this field for? Thanks. 回答1: Guard blocks are used to protect against the inclusion of a header file multiple times by the same compilation unit (c++ file). They look something like this: // Foo.h #ifndef INCLUDE_FILE_NAME_HERE_H_ #define INCLUDE_FILE_NAME_HERE_H_ class Foo { }; #endif If you include the same file

问题 I'm trying to pass userId to hub on connection to signalR. This is how client sets up the connection: connection = new HubConnectionBuilder() .WithUrl("http://localhost:56587/hub", options => { options.Headers["UserId"] = loginTextBox.Text; }) .AddMessagePackProtocol() .Build(); How can I read this header in OnConnectedAsync() method in my hub? 回答1: To get Header Value as string: public override async Task OnConnectedAsync() { var httpCtx = Context.GetHttpContext(); var someHeaderValue =

问题 I'm trying to pass userId to hub on connection to signalR. This is how client sets up the connection: connection = new HubConnectionBuilder() .WithUrl("http://localhost:56587/hub", options => { options.Headers["UserId"] = loginTextBox.Text; }) .AddMessagePackProtocol() .Build(); How can I read this header in OnConnectedAsync() method in my hub? 回答1: To get Header Value as string: public override async Task OnConnectedAsync() { var httpCtx = Context.GetHttpContext(); var someHeaderValue =

问题 I am using Code::Blocks to test some codes, and I just can't biuld this code: #include <stdio.h> #include <stdlib.h> #include <sndfile.h> int main() { SNDFILE *sf; sf = sf_open("file.wav",SFM_READ,&info); //error happens in this line ... And the error is "undefined reference to `sf_open'", this not only happens to sf_open but also to any function from sndfile.h. Actually here is what I did to get here: I've first downloaded and installed libsndfile for Windows x64 (I'm using Windows 10) from

问题 I tried to make my own header file but it doesn't work vim says wget.h:2:2: error: invalid preprocessing directive #ifndef__WGET_H__ wget.h:3:2: error: invalid preprocessing directive #define__WGET_H__ wget.h:7:2: error: #endif without #if My code is this: //wget header file #ifndef__WGET_H__ #define__WGET_H__ int my_wget (char web_address[]); #endif /*__WGET_H__*/ it seems fine to me (the examples I have read are much alike with mine) and I don't know what went wrong. Any ideas? 回答1:

问题 I have been sent code for a program built in C that uses a reinforcement learning algorithm. I need to modify it, yet I am having difficulties with compiling the code in the first place. Here are the outputs in CodeBlocks. All errors come from one line of code in a header file, which is part of the IBM CPLEX include directory (include\cplex\cpxconst.h) The line of code in question is as follows. define CPXDEPRECATEDAPI(version) __declspec(dllimport deprecated) error messages are multiple

问题 I made a server query via an app developed using react-native. I used fetch API and it turns out any query with authorization header not working. POST and GET method REQUESTS that don't expect Authorization headers at the server side works well. Some Queries at the server side are protected with authorization and when I make such queries including authorization header, I always get '401:unauthorized' error. But such queries works well with POSTMAN. Any suggestions here would be of great help.

问题 I made a server query via an app developed using react-native. I used fetch API and it turns out any query with authorization header not working. POST and GET method REQUESTS that don't expect Authorization headers at the server side works well. Some Queries at the server side are protected with authorization and when I make such queries including authorization header, I always get '401:unauthorized' error. But such queries works well with POSTMAN. Any suggestions here would be of great help.

问题 I made a server query via an app developed using react-native. I used fetch API and it turns out any query with authorization header not working. POST and GET method REQUESTS that don't expect Authorization headers at the server side works well. Some Queries at the server side are protected with authorization and when I make such queries including authorization header, I always get '401:unauthorized' error. But such queries works well with POSTMAN. Any suggestions here would be of great help.

问题 We have a requirement in which we need to hide the header of the window and for this we are using header:false But if we use header:false, then window can not be dragged at all. Thus, is there anyway by which a window can be made draggable by body? That is, if header is set to false and is not getting displayed then also somehow user can drag the window. Any suggestions anyone. Thanks for the help. PS: ExtJS Version 4.1 回答1: You could create your own window class that changes how the dragging