MQL4 使用 Windows API 实现 Http POST 和 GET 请求的示例代码

#import "wininet.dll"
   int InternetOpenA(string, int, string, string, int);
   int InternetConnectA(int, string, int, string, string, int, int, int);
   int HttpOpenRequestA(int, string, string, string, string, string[], int, int);
   int HttpAddRequestHeadersA(int, string, int, int);
   int HttpSendRequestA(int, string, int, string, int);
   int InternetReadFile(int, string, int, int[]);
   int HttpQueryInfoA(int, int, string, int[], int[]);
   int InternetCloseHandle(int);
   int InternetSetOptionA(int, int, string, int);
   int InternetErrorDlg(int, int, int, string, int);
   int GetLastError();
   int FormatMessageA(int, int, int, int, string, int, int[]);
   int LocalFree(int);
#end

// 定义常量
#define INTERNET_OPEN_TYPE_DIRECT       1
#define INTERNET_SERVICE_HTTP           3
#define INTERNET_FLAG_RELOAD            0x80000000
#define INTERNET_FLAG_NO_CACHE_WRITE    0x04000000
#define INTERNET_FLAG_SECURE            0x00800000
#define HTTP_QUERY_STATUS_CODE          19
#define HTTP_QUERY_CONTENT_LENGTH       5
#define HTTP_QUERY_CONTENT_TYPE         1
#define HTTP_QUERY_SET_COOKIE           43
#define HTTP_STATUS_OK                  200
#define HTTP_STATUS_CREATED             201
#define HTTP_STATUS_ACCEPTED            202
#define HTTP_STATUS_NO_CONTENT          204

// 处理HTTP POST请求
string httpPost(string url, string postData, string cookie){
    // 初始化 WinAPI
    int hInternet = InternetOpenA("Mozilla/4.0", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
    int hConnect = InternetConnectA(hInternet, url, INTERNET_DEFAULT_HTTPS_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
    int hRequest = HttpOpenRequestA(hConnect, "POST", "", NULL, NULL, NULL, INTERNET_FLAG_SECURE | INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_RELOAD, 1);

    // 设置请求头
    string requestHeaders = "Content-Type: application/x-www-form-urlencoded";
    HttpAddRequestHeadersA(hRequest, requestHeaders, StringLen(requestHeaders), HTTP_ADDREQ_FLAG_REPLACE);

    // 设置请求的Cookie信息
    if (!cookie.IsEmpty()) {
        InternetSetOptionA(hRequest, INTERNET_OPTION_COOKIE, cookie, cookie.GetLength());
    }

    // 发送 POST 请求
    HttpSendRequestA(hRequest, postData, StringLen(postData), NULL, 0);
   
    // 获取响应状态码
    int statusCode = 0;
    int statusSize = sizeof(statusCode);
    HttpQueryInfoA(hRequest, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &statusCode, &statusSize, NULL);
   
    // 读取响应内容
    char buffer[4096];
    int bytesRead = 0;
    string response = "";
    while (InternetReadFile(hRequest, buffer, sizeof(buffer), &bytesRead) && bytesRead != 0){
        response = response + buffer;
        ZeroMemory(buffer, sizeof(buffer));
    }
   
    // 获取响应中的Cookie信息
    char cookieBuffer[4096];
    int cookieSize = sizeof(cookieBuffer);
    HttpQueryInfoA(hRequest, HTTP_QUERY_SET_COOKIE, cookieBuffer, &cookieSize, NULL);
   
    // 关闭 WinAPI
    InternetCloseHandle(hRequest);
    InternetCloseHandle(hConnect);
    InternetCloseHandle(hInternet);

    // 返回响应内容和Cookie信息
    if(statusCode == HTTP_STATUS_OK || statusCode == HTTP_STATUS_CREATED || statusCode == HTTP_STATUS_ACCEPTED || statusCode == HTTP_STATUS_NO_CONTENT) {
        return response;
    } else {
        return "";
    }
}

// 处理HTTP GET请求
string httpGet(string url, string cookie){
    // 初始化 WinAPI
    int hInternet = InternetOpenA("Mozilla/4.0", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
    int hConnect = InternetConnectA(hInternet, url, INTERNET_DEFAULT_HTTPS_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
    int hRequest = HttpOpenRequestA(hConnect, "GET", "", NULL, NULL, NULL, INTERNET_FLAG_SECURE | INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_RELOAD, 1);

    // 设置请求的Cookie信息
    if (!cookie.IsEmpty()) {
        InternetSetOptionA(hRequest, INTERNET_OPTION_COOKIE, cookie, cookie.GetLength());
    }

    // 发送 GET 请求
    HttpSendRequestA(hRequest, NULL, 0, NULL, 0);
   
    // 获取响应状态码
    int statusCode = 0;
    int statusSize = sizeof(statusCode);
    HttpQueryInfoA(hRequest, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &statusCode, &statusSize, NULL);
   
    // 读取响应内容
    char buffer[4096];
    int bytesRead = 0;
    string response = "";
    while (InternetReadFile(hRequest, buffer, sizeof(buffer), &bytesRead) && bytesRead != 0){
        response = response + buffer;
        ZeroMemory(buffer, sizeof(buffer));
    }
   
    // 获取响应中的Cookie信息
    char cookieBuffer[4096];
    int cookieSize = sizeof(cookieBuffer);
    HttpQueryInfoA(hRequest, HTTP_QUERY_SET_COOKIE, cookieBuffer, &cookieSize, NULL);
   
    // 关闭 WinAPI
    InternetCloseHandle(hRequest);
    InternetCloseHandle(hConnect);
    InternetCloseHandle(hInternet);

    // 返回响应内容和Cookie信息
    if(statusCode == HTTP_STATUS_OK || statusCode == HTTP_STATUS_CREATED || statusCode == HTTP_STATUS_ACCEPTED || statusCode == HTTP_STATUS_NO_CONTENT) {
        return response;
    } else {
        return "";
    }
}

// 在OnTick函数中调用示例
void OnTick(){
    string url = "https://example.com";
    string postData = "key1=value1&key2=value2";
    string cookie = ""; // 这里填写需要发送的Cookie值
   
    string response = httpPost(url, postData, cookie);
   
    if(response != ""){
        // 处理响应数据
        Print("POST请求响应：", response);
    }else{
        // 请求失败，处理错误信息
        int errorCode = GetLastError();
        // 输出错误信息
        Print("POST请求失败，错误码：", errorCode);
    }
}