VC++以FORM形式提交urlencode

源码资源网 · 发表于昨天 14:02

在 VC++ 里用表单方式（application/x-www-form-urlencoded）提交 HTTP 请求。下面给你一个典型实现思路和示例代码（用 WinHTTP，更常见、也更现代一些；如果你需要 WinINet 或 MFC CInternet 版本也可以再写）。

思路概括

构造表单字符串：key1=value1&key2=value2，各值做 URL 编码。
设置请求头：Content-Type: application/x-www-form-urlencoded;charset=UTF-8
用 WinHTTP/WinINet 发送 POST 请求，写入表单数据，读取响应。

下面示例用 WinHTTP + 简单的 URL 编码函数。

1. 简单 URL 编码函数 (C++)

#include <windows.h>
#include <string>
#include <sstream>
#include <iomanip>
std::string UrlEncode(const std::string& value)
{
std::ostringstream escaped;
escaped.fill('0');
escaped << std::hex << std::uppercase;
for (unsigned char c : value)
{
if ((c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9') ||
c == '-' || c == '_' || c == '.' || c == '~')
{
escaped << c;
}
else if (c == ' ')
{
escaped << '+'; // 表单里空格常用 +
}
else
{
escaped << '%' << std::setw(2) << int(c);
}
}
return escaped.str();
}

复制代码

2. 使用 WinHTTP 发送 application/x-www-form-urlencoded POST

#include <windows.h>
#include <winhttp.h>
#include <string>
#include <iostream>
#pragma comment(lib, "winhttp.lib")
bool PostFormUrlEncoded(
const std::wstring& host,
INTERNET_PORT port,
const std::wstring& path,
const std::string& formData, // 已经 key=value&key2=value2
std::string& responseBody // 输出响应体
)
{
bool result = false;
HINTERNET hSession = NULL, hConnect = NULL, hRequest = NULL;
// 1. 打开会话
hSession = WinHttpOpen(L"VC++ Form Client/1.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0);
if (!hSession) goto cleanup;
// 2. 连接服务器
hConnect = WinHttpConnect(hSession, host.c_str(), port, 0);
if (!hConnect) goto cleanup;
// 3. 打开请求 (POST)
hRequest = WinHttpOpenRequest(
hConnect,
L"POST",
path.c_str(),
NULL,
WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,
0 // 如果是 https 则用 WINHTTP_FLAG_SECURE
);
if (!hRequest) goto cleanup;
// 4. 设置头：Content-Type
LPCWSTR headers =
L"Content-Type: application/x-www-form-urlencoded; charset=UTF-8\r\n";
if (!WinHttpAddRequestHeaders(hRequest, headers,
(ULONG)-1L, WINHTTP_ADDREQ_FLAG_ADD))
goto cleanup;
// 5. 发送请求 + 写入表单数据
if (!WinHttpSendRequest(
hRequest,
WINHTTP_NO_ADDITIONAL_HEADERS,
0,
(LPVOID)formData.data(),
(DWORD)formData.size(),
(DWORD)formData.size(),
0))
goto cleanup;
if (!WinHttpReceiveResponse(hRequest, NULL))
goto cleanup;
// 6. 读取响应
for (;;)
{
DWORD dwSize = 0;
if (!WinHttpQueryDataAvailable(hRequest, &dwSize) || dwSize == 0)
break;
std::string buffer(dwSize, '\0');
DWORD dwRead = 0;
if (!WinHttpReadData(hRequest, &buffer[0], dwSize, &dwRead) || dwRead == 0)
break;
buffer.resize(dwRead);
responseBody += buffer;
}
result = true;
cleanup:
if (hRequest) WinHttpCloseHandle(hRequest);
if (hConnect) WinHttpCloseHandle(hConnect);
if (hSession) WinHttpCloseHandle(hSession);
return result;
}

复制代码

3. 组合表单并调用示例

假设你要提交：

phone = 13812345678
timestamp = "2025-11-18T10:00:00Z"
nonce = "abc123xyz"
sign = "someSignValue"

void TestPost()
{
std::string phone = UrlEncode("13812345678");
std::string timestamp = UrlEncode("2025-11-18T10:00:00Z");
std::string nonce = UrlEncode("abc 123 xyz"); // 带空格示例
std::string sign = UrlEncode("someSignValue");
std::string form =
"phone=" + phone + "&"
"timestamp=" + timestamp + "&"
"nonce=" + nonce + "&"
"sign=" + sign;
std::string resp;
bool ok = PostFormUrlEncoded(
L"localhost", // 服务器域名
8080, // 端口
L"/auth/sendCode", // 路径
form,
resp
);
if (ok)
std::cout << "Response: " << resp << std::endl;
else
std::cout << "Request failed" << std::endl;
}

复制代码

4. 编译 / 链接要点

工程里要包含：
- windows.h
- winhttp.h
链接库：
- winhttp.lib（在 VC++ 的链接器设置里添加，或者用 #pragma comment(lib, "winhttp.lib")）

		自动登录	找回密码
密码			立即注册

VC++以FORM形式提交urlencode

相关帖子