我使用CLR project配置在visual c++中创建了64 bit，并尝试使用cpprestsdk aka casablanca 64bit。
但是当我运行该项目时，发生了错误：
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'['函数中显示.then字符错误，如.then([=](http_response response)所示，如果您指出，则会显示"a local lambda is not allowed in a member function of a managed class"
如果我尝试使用64位配置的cpprestsdk Visual C ++中的Windows Console Application，它可以正常工作。
我正在使用2017年的Visual Studio。
你认为cpprestsdk不能用于vc ++的CLR项目吗？
感谢。
这是我的代码，以及关于cpprestsdk的代码我刚刚从它的教程中得到了它：
#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*/
答案 0 :(得分：2)
在this answer的最后，Hans Passant给出了一个在你的情况下有用的提示。基本上，您需要一个单独的c ++库（clr支持已关闭），您可以在其中包装cpprest代码，从CLR项目链接此库，并确保没有包含的标题将带来<mutex>。
只是一个例子，在 restwrapper.h 头文件中有这样的类：
class RestWrapper
{
public:
void test();
};
在其实施文件中， 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CRL项目链接到该库。在CLR项目中，您只需要包含 restwrapper.h ，而这又不包含任何内容：
#include <restwrapper.h>
System::Void Testapi_Load(System::Object^ sender, System::EventArgs^ e)
{
RestWrapper wrapper;
wrapper.test();
}
答案 1 :(得分：0)
您可以调用一个使用CLR项目中的互斥锁的类，您需要做的是创建一个普通的c ++项目并创建具有所需功能但不在其标题中公开data "aws_iam_role" "example" {
name = "an_example_role_name"
}
的类，然后您可以自由地从CLR项目中调用这些类。
答案 2 :(得分：-2)
只需右键单击.cpp文件，然后在“常规->公共语言运行时支持”下选择“无公共语言运行时支持”。
最简单的解决方案。