任何人都知道为啥这个带有 WinHttp 的 POST 失败了

Posted 2023-02-16

【中文标题】任何人都知道为啥这个带有 WinHttp 的 POST 失败了

【英文标题】：Anyone know why this POST with WinHttp is failing任何人都知道为什么这个带有 WinHttp 的 POST 失败了

【发布时间】：2013-08-25 21:58:34

【问题描述】：

我正在尝试向 php 脚本发送 POST 请求。我有 GET 工作，但 POST 有一些问题。当它应该显示 post 参数的值时，结果总是空白。

#include <windows.h>
#include <wininet.h>

#pragma comment(lib, "Crypt32.lib")
#pragma comment(lib, "wininet.lib")

void PrintError(char *szFunc)

char szErr[128];
wsprintf(szErr, "%s: %d\n", szFunc, GetLastError());
OutputDebugString(szErr);


int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
   
BOOL bCookie;
DWORD dwFlags;
DWORD dwReadSize;
DWORD dwBuffLen = sizeof(dwFlags);
HINTERNET hInternet, hSession, hRequest;  
char szBuffer[256 * 1024] = ""; 
SIZE_T nBufferSize = 0; 

hInternet = InternetOpen("Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0", INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
if(hInternet == NULL)

    PrintError("InternetOpen");
    return 0;



hSession = InternetConnect(hInternet, "localhost", 443, NULL, NULL, INTERNET_SERVICE_HTTP, 0, NULL);
if(hSession == NULL)

    PrintError("InternetConnet");
    return 0;


hRequest = HttpOpenRequest(hSession, "GET", "/index.php", "HTTP/1.1", NULL, NULL, INTERNET_FLAG_SECURE|INTERNET_FLAG_RELOAD|INTERNET_FLAG_NO_CACHE_WRITE|INTERNET_FLAG_NO_COOKIES, NULL);
if(hRequest == NULL)
   
    PrintError("HttpOpenRequest");
    return 0;


// Need to do this to support self signed SSL certificates          
InternetQueryOption(hRequest, INTERNET_OPTION_SECURITY_FLAGS, (LPVOID)&dwFlags, &dwBuffLen);
dwFlags = INTERNET_FLAG_IGNORE_CERT_CN_INVALID|SECURITY_FLAG_IGNORE_UNKNOWN_CA;
InternetSetOption (hRequest, INTERNET_OPTION_SECURITY_FLAGS, &dwFlags, sizeof(dwFlags));    

// Set cookie data
if(!HttpAddRequestHeaders(hRequest, "Cookie: my_cookie=chocolate_chip\r\n", -1L, HTTP_ADDREQ_FLAG_ADD))
                   
    PrintError("HttpAddRequestHeaders"); 
    return 0;
   

if(!HttpSendRequest(hRequest, NULL, 0, NULL, 0))
   
    PrintError("HttpSendRequest"); 
    return 0;


for(;;)

    dwReadSize = 0;
    InternetReadFile(hRequest, szBuffer + nBufferSize, sizeof(szBuffer) - nBufferSize - 1, &dwReadSize);
    if(!dwReadSize)
    
        break;
                           
    szBuffer[nBufferSize + dwReadSize] = 0;                       
    nBufferSize += dwReadSize;


if(strstr(szBuffer, "chocolate_chip"))

    bCookie = true;
    OutputDebugString("Cookie Is Working...\n");            


hRequest = HttpOpenRequest(hSession, "POST", "/index.php", "HTTP/1.1", NULL, NULL, INTERNET_FLAG_SECURE|INTERNET_FLAG_RELOAD|INTERNET_FLAG_NO_CACHE_WRITE|INTERNET_FLAG_NO_COOKIES, NULL);
if(hRequest == NULL)
   
    PrintError("HttpOpenRequest");
    return 0;


// Need to do this to support self signed SSL certificates          
InternetQueryOption(hRequest, INTERNET_OPTION_SECURITY_FLAGS, (LPVOID)&dwFlags, &dwBuffLen);
dwFlags = INTERNET_FLAG_IGNORE_CERT_CN_INVALID|SECURITY_FLAG_IGNORE_UNKNOWN_CA;
InternetSetOption (hRequest, INTERNET_OPTION_SECURITY_FLAGS, &dwFlags, sizeof(dwFlags));    

// Should be at the top, just for debug..
char *szPostData = "my_post=HelloWorld!";   
if(!HttpSendRequest(hRequest, "Content-Type: application/x-www-form-urlencoded", -1, (LPVOID)szPostData, sizeof(szPostData)))

    PrintError("HttpOpenRequest");
    return 0;
   

// Clear the buffer from before
memset(szBuffer, 0, sizeof(szBuffer));

// Maybe there is a better way to read data?
for(;;)

    dwReadSize = 0;
    InternetReadFile(hRequest, szBuffer + nBufferSize, sizeof(szBuffer) - nBufferSize - 1, &dwReadSize);
    if(!dwReadSize)
    
        break;
                           
    szBuffer[nBufferSize + dwReadSize] = 0;                       
    nBufferSize += dwReadSize;


MessageBox(0, szBuffer, 0, 0); // Always empty for post 

InternetCloseHandle(hRequest);
InternetCloseHandle(hSession);
InternetCloseHandle(hInternet);
return 0;

我使用的 PHP 代码只是为了让您可以在这里看到我想要做什么。

<?php   

if(isset($_COOKIE['my_cookie']))

    echo $_COOKIE['my_cookie'];


if(isset($_POST['my_post']))
           
        echo $_POST['my_post'];         
   

?>

在这里待了几个小时。有谁知道怎么回事？

【问题讨论】：

应该重新标记 WinINet。开始查看服务器正在接收的原始正文。

重新标记。我检查了服务器日志。似乎还可以。 [26/Aug/2013:10:41:12 +1200] "POST /index.php HTTP/1.1" 200 - "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/ 23.0" $_POST[] 似乎没有设置好。

【参考方案1】：

char *szPostData = "my_post=HelloWorld!";   
if(!HttpSendRequest(hRequest, "Content-Type: application/x-www-form-urlencoded", -1, (LPVOID)szPostData, sizeof(szPostData)))

sizeof(szPostData) 不会做你认为的那样。它计算char* 指针的字节大小，而不是它指向的数据。

【讨论】：

... 以及后续。将其更改为 static const char szPostData[] = "..." 并从请求大小中减去 1。或者使用strlen()，虽然这似乎有点没有意义，因为它总是相同的长度。