有没有使用 WinInet c++ 进行 http 上传的好例子 图书馆

Question

我无法让我的代码工作：/

Answer 1

最终我在 web 上找到了一些工作示例

static char szRawData[5000];
  memset(szRawData, 0x11, sizeof(szRawData));

  //
  // CIHandle is just a wrapper class for HINTERNET, that closes handle in destructor
  //
  CIHandle hIntrn = InternetOpen( "LiveUpdate"), 
                                  INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY,
                                  NULL,
                                  NULL,
                                  0);
  if (!hIntrn)
    return printf("No Internet connection: %li.\n", GetLastError());

  CIHandle hConn = InternetConnect( hIntrn, 
                                    "65.254.250.104",
                                    INTERNET_DEFAULT_HTTP_PORT,
                                    NULL,
                                    NULL,
                                    INTERNET_SERVICE_HTTP,
                                    0,
                                    NULL);
  if (!hConn)
    return printf("Connection to update server failed: %li.\n", GetLastError());

  DWORD dwOpenRequestFlags = INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP |
                             INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTPS |
                             INTERNET_FLAG_KEEP_CONNECTION |
                             INTERNET_FLAG_NO_AUTO_REDIRECT |
                             INTERNET_FLAG_NO_COOKIES |
                             INTERNET_FLAG_NO_CACHE_WRITE |
                             INTERNET_FLAG_NO_UI |
                             INTERNET_FLAG_RELOAD;

  CIHandle hReq = HttpOpenRequest(hConn,
                                  "POST",
                                  "upload.php",
                                  "HTTP/1.0",
                                  NULL,
                                  NULL,
                                  dwOpenRequestFlags,
                                  NULL);

  ZString strBoundary = "---------------------------autoupdater";
  ZString strContentHeader =  "Host: www.mydomain_at_powweb.com\r\n"
                              "Content-Type: multipart/form-data; boundary=";
  strContentHeader+=strBoundary;

  HttpAddRequestHeaders(hReq, strContentHeader, strContentHeader.length(), HTTP_ADDREQ_FLAG_ADD);


  ZString strHeaders;
  strHeaders.precache(16384);
  sprintf(strHeaders,
          "--%s\r\n"
          "Content-Disposition: form-data; name=\"userfile\"; "
          "filename=\"test.raw\"\r\n"
          "Content-Type: application/octet-stream\r\n\r\n",
          (LPCTSTR)strBoundary);

  tCharSeq s;//this is a just a dynamic array of bytes;
  //
  // append headers and file to request:
  //
  s.precache(16384);
  s.append(strHeaders.length(), strHeaders);
  //append with file data:
  s.append(2000, szRawData); //<------------------- depending on this size, SendRequest fails.
  //trailing end of data:
  s.append(4,"\r\n--");
  s.append(strBoundary.length(), (LPTSTR)strBoundary);
  s.append(4,"--\r\n");

  InternetSetOption(hReq, INTERNET_OPTION_USERNAME, "username\0", 9);
  InternetSetOption(hReq, INTERNET_OPTION_PASSWORD, "password\0", 9);

  if (!HttpSendRequest(hReq, NULL, 0, (void*)s.getBuffer(), s.length()))
    return printf("HttpSendRequest failed: %li.\n", GetLastError());

Answer 2

这是 Microsoft 的一个简单示例。

   static TCHAR hdrs[] =
      _T("Content-Type: application/x-www-form-urlencoded");
   static TCHAR frmdata[] =
      _T("name=John+Doe&userid=hithere&other=P%26Q");
  static LPSTR accept[2]={"*/*", NULL};

   // for clarity, error-checking has been removed
   HINTERNET hSession = InternetOpen("MyAgent",
      INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
   HINTERNET hConnect = InternetConnect(hSession, _T("ServerNameHere"),
      INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
   HINTERNET hRequest = HttpOpenRequest(hConnect, "POST",
      _T("FormActionHere"), NULL, NULL, accept, 0, 1);
   HttpSendRequest(hRequest, hdrs, strlen(hdrs), frmdata, strlen(frmdata));
   // close any valid internet-handles

该示例来自此处。

Answer 3

MSDN 有一个很好的示例 SAMPLE:Using HttpSendRequestEx对于大型 POST 请求
它还包含一个供HTTP服务器接收数据的ASP文件，请在msdn页面下载自解压文件“Hsrex.exe”。

Answer 4

我找不到如何使用 wininet 和 c/c++ 的简单而完整的代码，因此我从一点点开始为将来访问但无法弄清楚的人编写了一个简单而简单的 c 代码。该代码可以上传任何文件（二进制，文本，mp3 ....）到您指定的主机名，对于后端我使用php（下面的代码）。

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

int main(int argc,char *argv[])
{
    if(argc!=4)
    {
        printf("USAGE:fileuploader.exe hostname scriptname filename");
        exit(1);
    }
    HANDLE hfile=CreateFile(argv[3],GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);
    if(hfile==INVALID_HANDLE_VALUE)
    {
        printf("creatfile error %lu",GetLastError());
        exit(1);
    }
    DWORD filesize=GetFileSize(hfile,NULL);
    //STARTING PREPARING THE WININET CODE.
    PCHAR szstart = "Content-Type: multipart/form-data; boundary=----qwerty";
    PCHAR szData    = "------qwerty\r\n"
                      "Content-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n"
                      "Content-Type: application/octet-stream\r\n"
                      "Content-Transfer-Encoding: binary\r\n\r\n";
    PCHAR szDataEnd = "\r\n------qwerty--\r\n";
    char szheaders[1024];
    wsprintf(szheaders,szData,"filetoupload",argv[3]);
    HINTERNET hsession,hconnect,hrequest;
    DWORD bytesread,byteswritten,contentlen;
    hsession=InternetOpen("fileuploader",INTERNET_OPEN_TYPE_DIRECT,NULL,NULL,0);
    if(!hsession)
    {
        printf("internet open error %lu",GetLastError());
        exit(1);
    }
    hconnect=InternetConnect(hsession,argv[1],INTERNET_DEFAULT_HTTP_PORT,NULL,NULL,INTERNET_SERVICE_HTTP,0,0);
    hrequest=HttpOpenRequest(hconnect,"POST",argv[2],NULL,NULL,0,0,0);
    contentlen=lstrlen(szheaders)+filesize+lstrlen(szDataEnd);
    LPBYTE pbuf=(LPBYTE)malloc(contentlen);
    CopyMemory(&pbuf[0],szheaders,lstrlen(szheaders));
    ReadFile(hfile,&pbuf[lstrlen(szheaders)],filesize,&bytesread,NULL);
    CopyMemory(&pbuf[lstrlen(szheaders)+filesize],szDataEnd,lstrlen(szDataEnd));
    HttpSendRequest(hrequest,szstart,lstrlen(szstart),pbuf,contentlen);
    char testbuf[1024];
    InternetReadFile(hrequest,testbuf,(DWORD)sizeof(testbuf),&byteswritten);
    printf("%s",testbuf);


}

这是我使用的 php 代码

<?php
if(isset($_FILES["filetoupload"]))
{
    $path="C:/xampp/htdocs/";
    $path=$path.basename($_FILES['filetoupload']['name']);
    print($path);
    if(move_uploaded_file($_FILES['filetoupload']['tmp_name'],$path))
    {
        print("upload success");
    }
    else
    {
        print("no success");

    }

}


?>

<html>
<body>
<form action="fileupload.php" method="post" enctype="multipart/form-data">  
    Select File:  
    <input type="file" name="filetoupload"/>  
    <input type="submit" value="Upload Image" name="submit"/>  
</form>  
</body>
</html>