c - 用c语言在localhost上传adobe reader文件

Question

I am uploading adobe files in local host it is uploading file successfully but it is showing corrupt or damage file after opening file please help me out to sort out this problem i will be thankful to you below is my entire code

int main()
{
WIN32_FIND_DATA fdFile;
HANDLE hFind = NULL;

TCHAR sPath[2048];
char sDir[2048]= "C:\\boot\\config\\";

//Specify a file mask. *.* = We want everything!

sprintf(sPath, "%s\\*.*", sDir);
//////////////////////////////////////////////////////////

if((hFind = FindFirstFile(sPath, &fdFile)) == INVALID_HANDLE_VALUE)
{
    printf("Path not found: [%s]\n", sDir);
    return false;
}
do
{
   //Find first file will always return "."
    //    and ".." as the first two directories.
    if(strcmp(fdFile.cFileName, ".") != 0
            && strcmp(fdFile.cFileName, "..") != 0)
    {
        sprintf(sPath, "%s\\%s", sDir, fdFile.cFileName);
 if(fdFile.dwFileAttributes &FILE_ATTRIBUTE_DIRECTORY)
        {
            printf("Directory: %s\n", sPath);

        }
        else{
            printf("%s\n", sPath);
static char *type = "text/pdf";
static TCHAR hdrs[] = "Content-Type: multipart/form-data; boundary=---------------------------7d82751e2bc0858";
static char boundary[] = "-----------------------------7d82751e2bc0858";            //Header boundary
static char nameForm[] = "uploadedfile";     //Input form name
static char iaddr[] = "localhost";        //IP address
static char url[] = "/xampp/testing/upload.php?folder=aaaa&&foldername=bbbb";

char * buffer;                   //Buffer containing file + headers
char * content;                  //Buffer containing file
FILE * pFile;                    //File pointer
long lSize;                      //File size
size_t result;
char *pos; // used in the loop

// Open file
pFile = fopen(filepath, "rb");
if (pFile == NULL)
{
    printf("ERROR_OPEN_FILE");
    getchar();
    return ERROR_OPEN_FILE;
}
printf("OPEN_FILE\n");

// obtain file size:
fseek(pFile, 0, SEEK_END);
lSize = ftell(pFile);
rewind(pFile);

// allocate memory to contain the whole file:
content = (char*)malloc(sizeof(char)*lSize);
if (content == NULL)
{
    printf("ERROR_MEMORY");
    getchar();
    return ERROR_OPEN_FILE;
}
 printf("MEMORY_ALLOCATED\t \"%d\" \n", lSize);
// copy the file into the buffer:
result = fread(content, 1, lSize, pFile);

rewind (pFile);

if (result != lSize)
{
    printf("ERROR_SIZE");
    getchar();
    return ERROR_OPEN_FILE;
}
printf("SIZE_OK\n");

// terminate
fclose(pFile);
printf("FILE_CLOSE\n");
//allocate memory to contain the whole file + HEADER
    buffer = (char*)malloc(sizeof(char)*lSize + 2048);

   //print header

sprintf(buffer, "%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n", boundary, nameForm, filename);
sprintf(buffer, "%sContent-Type: %s\r\n", buffer, type);
sprintf(buffer, "%sContent-Length: %d\r\n", buffer, lSize);
strcat(buffer, "\r\n");
int len= strlen(buffer);
memcpy(buffer + len, content, lSize);
char *buf_tail= buffer+len+lSize;
strcpy(buf_tail, "\r\n");
buf_tail += 2; 
strcpy(buf_tail, boundary);
buf_tail += strlen(boundary);
strcpy(buf_tail, "--\r\n");

//Open internet connection
HINTERNET hSession = InternetOpen("WINDOWS", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
if (hSession == NULL)
{
    printf("ERROR_INTERNET_OPEN");
    getchar();
    return ERROR_OPEN_FILE;
}
printf("INTERNET_OPENED\n");

HINTERNET hConnect = InternetConnect(hSession, iaddr, INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
if (hConnect == NULL)
{
    printf("ERROR_INTERNET_CONN");
    getchar();
    return ERROR_INTERNET_CONN;
}
printf("INTERNET_CONNECTED\n");

HINTERNET hRequest = HttpOpenRequest(hConnect, (const char*)"POST", _T(url), NULL, NULL, NULL, INTERNET_FLAG_RELOAD, 1);
if (hRequest == NULL)
{
    printf("ERROR_INTERNET_REQ");
    getchar();

}
printf("INTERNET_REQ_OPEN\n");

BOOL sent = HttpSendRequest(hRequest, hdrs, strlen(hdrs), buf_tail, strlen(buf_tail));

if (!sent)
{
    printf("ERROR_INTERNET_SEND");
    getchar();
    return ERROR_INTERNET_CONN;
}
printf("INTERNET_SEND_OK\n");
printf("\r\n%s\r\n",buffer);

//close any valid internet-handles
InternetCloseHandle(hSession);
InternetCloseHandle(hConnect);
InternetCloseHandle(hRequest);
 }
 }
 }
while(FindNextFile(hFind, &fdFile));
FindClose(hFind); //clean things up!
getch();
return 0;
}

Answer 1

请注意，content(pdf 文件的内容)采用特定的 pdf 格式。当你这样做时:

memcpy(buffer + strlen(buffer),content,lSize);
sprintf(buffer, "%s\r\n", buffer);

然后 sprintf 将在第一个 \0(空字符)处停止打印。

你应该这样做:

//print header
sprintf(buffer, "%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"\r\n", boundary, nameForm, filename);
sprintf(buffer, "%sContent-Type: %s\r\n", buffer, type);
sprintf(buffer, "%sContent-Length: %d\r\n", buffer, lSize);

strcat(buffer, "\r\n");
int len= strlen(buffer);                // remember length of header
memcpy(buffer + len, content, lSize);   // append contents
char *buf_tail= buffer+len+lSize;       // start of tail
strcpy(buf_tail, "\r\n");
buf_tail += 2;

strcpy(buf_tail, boundary);
buf_tail += strlen(boundary);
strcpy(buf_tail, "--\r\n");

也就是说，您跟踪缓冲区的末尾并在其中添加数据。