使用/ clr或clr：pure（cpprestsdk aka casablanca）编译时，不支持Mutex [英] Mutex is not supported when compiling with /clr or clr:pure (cpprestsdk aka casablanca)
问题描述
我用 64位 visual c ++ 中创建了 CLR项目 $ c>配置，并尝试使用 cpprestsdk aka casablanca 64bit 。
I create a CLR project in visual c++ with 64 bit configuration, and try to use cpprestsdk aka casablanca 64bit.
但是当我运行项目时，发生错误：
But when I run the project, an error occured:
1>------ Build started: Project: Timestamp, Configuration: Debug x64 ------
1>MyForm.cpp
1>c:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.13.26128\include\mutex(8): fatal error C1189: #error: <mutex> is not supported when compiling with /clr or /clr:pure.
1>Testapi.cpp
1>c:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.13.26128\include\mutex(8): fatal error C1189: #error: <mutex> is not supported when compiling with /clr or /clr:pure.
1>Generating Code...
1>Done building project "Timestamp.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
其他错误：
E2093 a local lambda is not allowed in a member function of a managed class Timestamp c:\Users\Laptop-attendance\source\repos\Timestamp\Timestamp\Testapi.h 97
IDE在 .then（[=]（http_response响应），如果您指出，它表示托管类的成员函数中不允许使用本地lambda
The IDE shows an error about '[' characters in the .then function like .then([=](http_response response), which if you pointed it out, it says "a local lambda is not allowed in a member function of a managed class"
如果我尝试使用 cpprestsdk 在具有64位配置的Visual c ++的 Windows控制台应用程序中，它可以正常工作。
If I try the cpprestsdk in a Windows Console Application of Visual c++ with 64 bit configuration, it works fine.
我正在使用Visual Studio 2017。
I'm using visual studio 2017.
您认为cpprestsdk不能用于vc ++的CLR项目吗？
Do you think cpprestsdk cannot be used in CLR project of vc++?
谢谢。
这是我的代码，以及有关cppre的代码stsdk我刚从教程中得到它：
Here's my code, and the code about cpprestsdk I just got it from its tutorial:
#ifndef TESTAPI_H
#define TESTAPI_H
#pragma once
#include <cpprest/http_client.h>
#include <cpprest/filestream.h>
#include <cpprest/json.h>
namespace Timestamp {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
using namespace utility; // Common utilities like string conversions
using namespace web; // Common features like URIs.
using namespace web::http; // Common HTTP functionality
using namespace web::http::client; // HTTP client features
using namespace concurrency::streams; // Asynchronous streams
/// <summary>
/// Summary for Testapi
/// </summary>
public ref class Testapi : public System::Windows::Forms::Form
{
public:
Testapi(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Testapi()
{
if (components)
{
delete components;
}
}
private:
/// <summary>
/// Required designer variable.
/// </summary>
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->SuspendLayout();
//
// Testapi
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(284, 261);
this->Name = L"Testapi";
this->Text = L"Testapi";
this->Load += gcnew System::EventHandler(this, &Testapi::Testapi_Load);
this->ResumeLayout(false);
}
#pragma endregion
private: System::Void Testapi_Load(System::Object^ sender, System::EventArgs^ e) {
auto fileStream = std::make_shared<ostream>();
// Open stream to output file.
pplx::task<void> requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)
{
*fileStream = outFile;
// Create http_client to send the request.
http_client client(U("http://13.231.231.252:3000/api/individual_employment_setting/detail/172"));
// Build request URI and start the request.
//uri_builder builder(U("/search"));
//builder.append_query(U("q"), U("cpprestsdk github"));
return client.request(methods::GET);
})
// Handle response headers arriving.
.then([=](http_response response)
{
printf("Received response status code:%u\n", response.status_code());
// Write response body into the file.
// return response.body().read_to_end(fileStream->streambuf());
stringstreambuf buffer;
response.body().read_to_end(buffer).get();
//show content in console
printf("Response body: \n %s", buffer.collection().c_str());
//parse content into a JSON object:
//json::value jsonvalue = json::value::parse(buffer.collection());
return fileStream->print(buffer.collection()); //write to file anyway
})
// Close the file stream.
.then([=](size_t)
{
return fileStream->close();
});
// Wait for all the outstanding I/O to complete and handle any exceptions
try
{
requestTask.wait();
}
catch (const std::exception &e)
{
printf("Error exception:%s\n", e.what());
}
}
};
}
#endif /*TESTAPI_H*/
推荐答案
在此答案的最后，汉斯·帕桑特（Hans Passant）给出了一个提示，该提示对于你的情况。基本上，您需要一个单独的c ++库（关闭了crr支持），在其中包装 cpprest 代码，从您的CLR项目链接此库，并确保没有包含的标头会带来< mutex> 输入。
At the very end of this answer, Hans Passant gives a hint which is useful in your case. Basically, you need a separate c++ library (clr support turned off) where you wrap the cpprest code, link this library from your CLR project and be sure no included headers will bring <mutex> in.
仅举一个例子，在 restwrapper中有一个这样的类。 h 头文件：
Just an example, have a class like this, in a restwrapper.h header file:
class RestWrapper
{
public:
void test();
};
在其实现文件中， restwrapper.cpp ：
#include "restwrapper.h"
#include <cpprest/http_client.h>
#include <cpprest/filestream.h>
#include <cpprest/json.h>
using namespace utility; // Common utilities like string conversions
using namespace web; // Common features like URIs.
using namespace web::http; // Common HTTP functionality
using namespace web::http::client; // HTTP client features
using namespace concurrency::streams; // Asynchronous streams
void RestWrapper::test()
{
auto fileStream = std::make_shared<ostream>();
// Open stream to output file.
pplx::task<void> requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)
{
*fileStream = outFile;
// Create http_client to send the request.
http_client client(U("http://13.231.231.252:3000/api/individual_employment_setting/detail/172"));
//etc ...
}
您可以在DLL中编译此类（链接 cpprest 及其所有相关库），然后使您的CLR项目链接该库。在CLR项目中，您仅需要包含 restwrapper.h ，而该库又不包含任何内容：
You can compile this class in a DLL (linking cpprest and all its related libraries) then make your CLR project link that library. In the CLR project you need to include restwrapper.h only, which in turn includes nothing:
#include <restwrapper.h>
System::Void Testapi_Load(System::Object^ sender, System::EventArgs^ e)
{
RestWrapper wrapper;
wrapper.test();
}
这篇关于使用/ clr或clr：pure（cpprestsdk aka casablanca）编译时，不支持Mutex的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
