Facebook图表api上传图像withou sdk

Question

有没有人尝试上传图像使用FB图形api没有SDK的支持？我试图通过图形API浏览器来做到这一点，我总是得到“需要上传文件”的回应。我正在使用multipart/form-data编码形成请求并使用“source”参数。一个有效的示例请求会很有帮助。

Answer 1

我用openssl编写了一个c代码示例。您可以将函数iotask（）中实现的http原始数据部分集中在一起。以下是示例代码：

/* 
    compile: 
     gcc -o fb_photo_upload fb_photo_upload.c -lssl -lcrypto 
*/ 

#include <sys/socket.h> 
#include <resolv.h> 
#include <netdb.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <string.h> 
#include <unistd.h> 
#include <ctype.h> 

#include <openssl/bio.h> 
#include <openssl/ssl.h> 
#include <openssl/err.h> 
#include <openssl/pem.h> 
#include <openssl/x509.h> 
#include <openssl/x509_vfy.h> 

/* 
* A image hex array. Let's say if you have a image file called 'myimage.png'. 
* then create the hex array as below: 
*  xxd -i myimage.png > myimage.c 
*/ 
#include "myimage.c" 

#define BOUNDARY "boundary12345" 

char data_file_header[] = \ 
    "--" BOUNDARY "\r\n" \ 
    "Content-Disposition: form-data; name=\"source\"; filename=\"myimage.png\"\r\n" \ 
    "Content-Type: application/octet-stream\r\n\r\n"; 

char data_end[] = \ 
    "\r\n--" BOUNDARY "--\r\n"; 

int iotask(SSL *ssl) { 
    int i, n, content_len; 
    char *p; 
    char writebuf[1024]; 
    char readbuf[1024]; 

    content_len = strlen(data_file_header) + myimage_png_len + strlen(data_end); 

    p = writebuf; 
    p += sprintf(p, "POST /v2.9/me/photos?access_token=EAAEcZAcqQqtUBAJyBItkYPLQ0URkZAFPwLXDbPZClSl3BgUvCjJk32Y5QvgNSDuuBMoC4VdoSOknQYJWnx7L2ZCZACPx5ZA2xfPd5ZB7gndtlIXoMkNumzIT0YKQkbqHgoJZBs3LWHw2UHZBbz3W9qm6xN4pKXzIAej1kunoBPGShDAABAB HTTP/1.1\r\n"); 
    p += sprintf(p, "Host: graph.facebook.com\r\n"); 
    p += sprintf(p, "Content-Type: multipart/form-data; boundary=" BOUNDARY "\r\n"); 
    p += sprintf(p, "Content-Length: %d\r\n", content_len); 
    p += sprintf(p, "\r\n"); 
    SSL_write(ssl, writebuf, strlen(writebuf)); 

    SSL_write(ssl, data_file_header, strlen(data_file_header)); 
    SSL_write(ssl, myimage_png, myimage_png_len); 

    SSL_write(ssl, data_end, strlen(data_end)); 

    n = SSL_read(ssl, readbuf, sizeof(readbuf)); 
    if (n > 0) { 
     printf("read %d bytes\r\n", n); 
     printf("++++++++ result ++++++++\r\n"); 
     printf("%s", readbuf); 
     printf("-------- result --------\r\n"); 
    } 
} 

int create_socket(const char *hostname, const int port) { 
    int sockfd; 
    struct hostent *host; 
    struct sockaddr_in dest_addr; 

    if ((host = gethostbyname(hostname)) == NULL) { 
     printf("cannot resolve hostname\r\n"); 
     abort(); 
    } 

    sockfd = socket(AF_INET, SOCK_STREAM, 0); 

    memset(&dest_addr, 0, sizeof(struct sockaddr_in)); 
    dest_addr.sin_family=AF_INET; 
    dest_addr.sin_port=htons(port); 
    dest_addr.sin_addr.s_addr = *(long*)(host->h_addr); 

    if (connect(sockfd, (struct sockaddr *) &dest_addr, sizeof(struct sockaddr)) == -1) { 
     printf("fail to connect\r\n"); 
    } 

    return sockfd; 
} 

int main() { 

    SSL_CTX *ctx; 
    SSL *ssl; 
    int sock = 0; 

    const char *hostname = "graph.facebook.com"; 
    const int port = 443; 

    OpenSSL_add_all_algorithms(); 
    ERR_load_BIO_strings(); 
    ERR_load_crypto_strings(); 
    SSL_load_error_strings(); 

    if(SSL_library_init() < 0) 
     printf("fail to init ssl\r\n"); 

    if ((ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) 
     printf("fail to create ssl context\r\n"); 

    //Disable SSLv2 and enable all workarounds for buggy servers 
    SSL_CTX_set_options(ctx, SSL_OP_ALL | SSL_OP_NO_SSLv2); 
    SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY); 
    SSL_CTX_set_mode(ctx, SSL_MODE_RELEASE_BUFFERS); 

    ssl = SSL_new(ctx); 

    if ((sock = create_socket(hostname, 443)) < 0) 
     printf("fail to create socket\r\n"); 

    SSL_set_fd(ssl, sock); 

    if (SSL_connect(ssl) != 1) 
     printf("fail to build ssl session\r\n"); 

    iotask(ssl); 

    SSL_free(ssl); 
    close(sock); 
    SSL_CTX_free(ctx); 
    printf("end ssl connection\r\n"); 
    return(0); 
}