[英]How can I access Amazon AWS S3 using GSOAP for C and C++?
[英]Access Amazon S3 services with C++ GSOAP client
我开始开发一个应用程序以使用SOAP API访问Amazon S3存储。
我已经阅读了文档,该文档指出如果文件大小大于1 MB,则必须使用方法PutObject。 现在,PutObject使用DIME附件。
是否有人提供示例代码或示例,或者有人可以向我展示如何使用GSOAP对Amazon S3的PutObject方法进行DIME附加。
由于可移植性,我想使用GSOAP并使其通用。 出于相同的原因,我不想使用Amazon提供的.NET API。 我特别希望在GSOAP中工作,就像我之前在GSOAP中工作过一样。
谢谢,
大卫
我整理了一些东西,使用PutObject上传大于1MB的文件,它也适用于较小的文件。 我将其分享给可能会觉得有用的其他人。
另请参阅我之前的有关使用GSOAP 使用GSOAP C C ++访问S3 AMAZON AWS S3的文章。该链接还包含生成签名的方法。
这是PutObject的代码。
它使用来自sourceforge的最新GSOAP。
在wsdl2h生成头文件和soapcpp2生成gsoap客户端代码之后,以下将是访问服务PutObject的代码……
要求:使用编译器预处理程序指令WITH_OPENSSL进行OpenSSL GSOAP Build。 包括库文件libeay32和ssleay32。 使用上面的链接生成签名的方法。
void PutObject(char *filename)
{
AmazonS3SoapBindingProxy amazonS3Interface;
struct soap* soapPtr;
soapPtr = dynamic_cast<struct soap*>(&amazonS3Interface);
soap_init2(soapPtr, SOAP_IO_DEFAULT|SOAP_IO_KEEPALIVE, SOAP_IO_DEFAULT|SOAP_IO_KEEPALIVE);
soap_ssl_client_context(&amazonS3Interface,
SOAP_SSL_NO_AUTHENTICATION, /* for encryption w/o authentication */
/* SOAP_SSL_DEFAULT | SOAP_SSL_SKIP_HOST_CHECK, */ /* if we don't want the host name checks since these will change from machine to machine */
/*SOAP_SSL_DEFAULT,*/ /* use SOAP_SSL_DEFAULT in production code */
NULL, /* keyfile (cert+key): required only when client must authenticate to server (see SSL docs to create this file) */
NULL, /* password to read the keyfile */
NULL, /* optional cacert file to store trusted certificates, use cacerts.pem for all public certificates issued by common CAs */
NULL, /* optional capath to directory with trusted certificates */
NULL /* if randfile!=NULL: use a file with random data to seed randomness */
);
//use this if you are behind a proxy to connect to internet
amazonS3Interface.proxy_host="proxyservername"; //proxyservername
amazonS3Interface.proxy_port=4050; //proxy port
amazonS3Interface.proxy_userid="username"; //proxy authentication
amazonS3Interface.proxy_passwd="password";
amazonS3Interface.proxy_http_version="1.1"; //http ver
amazonS3Interface.dime_id_format ="uuid:09233523-345b-4351-b623-5dsf35sgs5d6-%x";
// Set callback functions
soapPtr->fdimereadopen = dime_read_open;
soapPtr->fdimereadclose = dime_read_close;
soapPtr->fdimeread =dime_read;
_ns1__PutObject preq;
_ns1__PutObjectResponse presp;
ns1__PutObjectResult res;
FILE *fp=fopen(filename,"rb");
fseek(fp, 0L, SEEK_END);
size_t sz = ftell(fp);
fseek(fp, 0L, SEEK_SET);
preq.Bucket=std::string("FGTSDrive");//bucket name to put file in
preq.AWSAccessKeyId=new std::string("ACCESSKEY");//access key here
char *sig=aws_signature("SECRETKEY","AmazonS3","PutObject",xml_datetime(),NULL);//correct secretkey here
preq.Signature=new std::string(sig);
preq.Timestamp=new time_t(time(NULL));
preq.Key=std::string(filename);//name of the key ie the filename
int result(0);
preq.ContentLength=sz; //length of the file
ns1__MetadataEntry med;
med.Name=std::string("Content-Type");
med.Value=std::string("application/zip");//change the type depending on the file extenstion
med.soap=&amazonS3Interface;
preq.Metadata.push_back(&med);
soap_set_dime(soapPtr);
result =soap_set_dime_attachment(soapPtr, (char*)fp, sz,"application/zip", NULL, 0,filename);//change the content type depending on the file extenstion
if (result != SOAP_OK) { }
result = amazonS3Interface.PutObject(&preq, &presp);
if (result != SOAP_OK) { }
amazonS3Interface.soap_stream_fault(std::cout);
}
static void *dime_read_open(struct soap *soap, void *handle, const char *id, const char *type, const char *options)
{ // we should return NULL without setting soap->error if we don't want to use the streaming callback for this DIME attachment. The handle contains the non-NULL __ptr field value which should have been set in the application.
// return value of this function will be passed on to the fdimeread and fdimereadclose callbacks. The return value will not affect the __ptr field.
std::cout <<"dime_read_open"<<std::endl;
return handle;
}
static void dime_read_close(struct soap *soap, void *handle)
{
std::cout <<"dime_read_close"<<std::endl;
fclose((FILE*)handle);
}
static size_t dime_read(struct soap *soap, void *handle, char *buf, size_t len)
{
std::cout <<"dime_read_read"<<std::endl;
return fread(buf, 1, len, (FILE*)handle);
}
希望能帮助到你。
谢谢大卫
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