将文件发送到 HTTP 服务器 (C++ Wininet）

Sending file to HTTP server (C++ Wininet)

本文关键字：C++ Wininet 服务器 HTTP 文件更新时间：2023-10-16

我有在我的HTTP服务器上上传小.txt文件的代码：

#include <wininet.h>
#define BUF_SIZE 4096
void __fastcall TForm1::Button1Click(TObject *Sender)
{
 TStringList * list = new TStringList();
 AnsiString Path = "";
 if(OpenDialog1->Execute()) {
    Path =  "filename=""+OpenDialog1->FileName+""";
    list->LoadFromFile(OpenDialog1->FileName);
 }
 char data[BUF_SIZE] = "";
 static char hdrs[] = "Content-Type: multipart/form-data; boundary=---------------------------7d82751e2bc0858";
 strcat(data,"-----------------------------7d82751e2bc0858");
 strcat(data,"n");
 strcat(data,"Content-Disposition: form-data; name="files[]"; ");
 strcat(data,Path.c_str());
 strcat(data,"n");
 strcat(data,"Content-Type: application/octet-stream");
 strcat(data,"nn");
 strcat(data,list->Text.c_str());
 strcat(data,"n");
 strcat(data,"-----------------------------7d82751e2bc0858");
 strcat(data,"n");
 strcat(data,"Content-Disposition: form-data; name="user"");
 strcat(data,"rnrn");
 strcat(data,"username");
 strcat(data,"rn");
 strcat(data,"-----------------------------7d82751e2bc0858");
 strcat(data,"n");
 HINTERNET hSession = InternetOpen("MyAgent",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
 HINTERNET hConnect = InternetConnect(hSession, "localhost",INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
 HINTERNET hRequest = HttpOpenRequest(hConnect, "POST", "new_upltest.php", NULL, NULL, NULL, 0, 1);
 HttpSendRequest(hRequest, hdrs, strlen(hdrs), data, strlen(data));
 delete list;
}

它工作正常，但现在我需要上传大文件(超过 70-100 MB(，可以是图像(.jpg、.png、.bmp(和其他文档类型(.pdf、.docx等(。

是否可以使用此代码解决我的任务？我将感谢每一个建议...

附言我的 IDE C++生成器 6，但我认为这无关紧要。

这是一个文件上传的工作示例：

void http_upload_file(PCHAR szServer, PCHAR szScript, PCHAR szParam, PCHAR szValue, PCHAR szFile)
{
    PCHAR szHeaders = "Content-Type: multipart/form-data; boundary=----qwerty";
    PCHAR szData    = "------qwertyrn"
                      "Content-Disposition: form-data; name="%s"rnrn%srn"
                      "------qwertyrn"
                      "Content-Disposition: form-data; name="files[]"; filename="%s"rn"
                      "Content-Type: application/octet-streamrn"
                      "Content-Transfer-Encoding: binaryrnrn";
    PCHAR szDataEnd = "rn------qwerty--rn";
    char  szHeader[512];
    HINTERNET hSession, hConnect, hRequest;
    DWORD     dwFileSize, dwBytesRead, dwContentLength,dwBytesWritten;
    hSession = InternetOpen(NULL, INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
    if (hSession)
    {
        hConnect = InternetConnect(hSession, szServer, INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP,0, 0);
        if (hConnect)
        {
            hRequest = HttpOpenRequest(hConnect, "POST", szScript, NULL, NULL, 0, 0, 0);
            if (hRequest)
            {
                HANDLE hFile = CreateFile(szFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
                if (hFile != INVALID_HANDLE_VALUE)
                {
                    dwFileSize      = GetFileSize(hFile, NULL);
                    wsprintf(szHeader, szData, szParam, szValue, szFile);
                    dwContentLength = lstrlen(szHeader) + dwFileSize + lstrlen(szDataEnd);
                    LPBYTE pBuf     = (LPBYTE)malloc(dwContentLength);
                    CopyMemory(&pBuf[0], szHeader, lstrlen(szHeader));
                    ReadFile(hFile, &pBuf[lstrlen(szHeader)], dwFileSize, &dwBytesRead, NULL);
                    CopyMemory(&pBuf[lstrlen(szHeader) + dwFileSize], szDataEnd, lstrlen(szDataEnd));
                    HttpSendRequest(hRequest, szHeaders, lstrlen(szHeaders), pBuf, dwContentLength);
                    CloseHandle(hFile);
                    free(pBuf);
                }
            }
            InternetCloseHandle(hRequest);
        }
        InternetCloseHandle(hConnect);
    }
    InternetCloseHandle(hSession);
}