我在 win32 控制台应用程序中使用了 libcurl，它工作正常。我已按照此处的指示进行操作。http://theetrain.ca/tech/installing-curl-using-visual-studio-2010-beginners-guide/。现在我想在 Windows 窗体应用程序中使用 Lib curl。但它显示了一些错误。
1>读取网站app.obj：错误LNK2031：无法为“extern "C" void * __clrcall curl_easy_init(void)" (?curl_easy_init@@$$J0YMPAXXZ)生成p/invoke；元数据1>读取网站app.obj中缺少调用约定：错误LNK2028：未解析的令牌（0A000011）“extern”C“void * __clrcall curl_easy_init（void）”（？curl_easy_init@@$$J0YMPAXXZ）在函数“private：void”中引用__clrcall Readwebsiteapp::Form1::button1_Click(class System::Object ^,class System::EventArgs ^)" (?button1_Click@Form1@Readwebsiteapp@@$$FA$AAMXP$AAVObject@System@@P$AAVEventArgs@4@ @Z) 1>读取网站 app.obj : error LNK2019: unresolved external symbol "extern "C" void * __clrcall curl_easy_init(void)" (?curl_easy_init@@$$J0YMPAXXZ) 在函数“private:
请给我一些建议来解决这个问题。谢谢你。我的代码是：
#define CURL_STATICLIB
#include <stdio.h>
#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>
#include <string.h>
using namespace std;
#pragma once
namespace Readwebsiteapp {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
/// <summary>
/// Summary for Form1
/// </summary>
public ref class Form1 : public System::Windows::Forms::Form
{
public:
Form1(void)
{
InitializeComponent();
//
//TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~Form1()
{
if (components)
{
delete components;
}
}
private: System::Windows::Forms::Button^ button1;
protected:
private: System::Windows::Forms::TextBox^ textBox1;
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->button1 = (gcnew System::Windows::Forms::Button());
this->textBox1 = (gcnew System::Windows::Forms::TextBox());
this->SuspendLayout();
//
// button1
//
this->button1->Location = System::Drawing::Point(120, 70);
this->button1->Name = L"button1";
this->button1->Size = System::Drawing::Size(75, 23);
this->button1->TabIndex = 0;
this->button1->Text = L"button1";
this->button1->UseVisualStyleBackColor = true;
this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
//
// textBox1
//
this->textBox1->Location = System::Drawing::Point(120, 153);
this->textBox1->Name = L"textBox1";
this->textBox1->Size = System::Drawing::Size(100, 20);
this->textBox1->TabIndex = 1;
//
// Form1
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(420, 337);
this->Controls->Add(this->textBox1);
this->Controls->Add(this->button1);
this->Name = L"Form1";
this->Text = L"Form1";
this->ResumeLayout(false);
this->PerformLayout();
}
#pragma endregion
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e)
{
textBox1->Text = "hello";
CURL *curl;
CURLcode result;
curl = curl_easy_init();
}
};
}