日本熟妇hd丰满老熟妇,中文字幕一区二区三区在线不卡 ,亚洲成片在线观看,免费女同在线一区二区

AI 助理
備案控制臺
文檔
輸入文檔關鍵字查找
首頁 對象存儲 開發參考 SDK參考 C++ 對象/文件 管理文件 禁止覆蓋同名文件

C++禁止覆蓋同名文件

更新時間：
產品詳情
我的收藏

默認情況下，如果新添加文件與現有文件（Object）同名且對該文件有訪問權限，則新添加的文件將覆蓋原有的文件。本文介紹如何通過設置請求頭x-oss-forbid-overwrite在簡單上傳、拷貝文件及分片上傳等場景中禁止覆蓋同名文件。

注意事項

  • 本文以華東1（杭州）外網Endpoint為例。如果您希望通過與OSS同地域的其他阿里云產品訪問OSS，請使用內網Endpoint。關于OSS支持的Region與Endpoint的對應關系，請參見OSS地域和訪問域名。

  • 本文以OSS域名新建OSSClient為例。如果您希望通過自定義域名、STS等方式新建OSSClient，請參見新建OssClient。

簡單上傳

以下代碼用于簡單上傳時禁止覆蓋同名文件：

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
     /* yourEndpoint填寫Bucket所在地域對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地域對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";

    /* 初始化網絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);
    std::shared_ptr<std::iostream> content = std::make_shared<std::stringstream>();
    *content << "test cpp sdk";

    /* 指定上傳文件操作時是否覆蓋同名Object。*/
    /* 不指定x-oss-forbid-overwrite時，默認覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為false時，表示允許覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為true時，表示禁止覆蓋同名Object，如果同名Object已存在，程序將報錯。*/
    ObjectMetaData meta;
    meta.addHeader("x-oss-forbid-overwrite", "true");

    PutObjectRequest request(BucketName, ObjectName, content, meta);

    /* 上傳文件。*/
    auto outcome = client.PutObject(request);

    if (!outcome.isSuccess()) {
            /* 異常處理。*/
            std::cout << "PutObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* 釋放網絡等資源。*/
    ShutdownSdk();
    return 0;
}

拷貝文件

拷貝小文件

以下代碼用于拷貝小文件時禁止覆蓋同名文件：

#include <alibabacloud/oss/OssClient.h>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
     /* yourEndpoint填寫Bucket所在地域對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地域對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫源Bucket名稱，例如srcexamplebucket。*/
    std::string SourceBucketName = "srcexamplebucket";
    /* 填寫與源Bucket處于同一地域的目標Bucket名稱，例如destbucket。*/
    std::string CopyBucketName = "destbucket";
    /* 填寫源Object的完整路徑，完整路徑中不能包含Bucket名稱，例如srcdir/scrobject.txt。*/
    std::string SourceObjectName = "srcdir/scrobject.txt";
    /* 填寫目標Object的完整路徑，完整路徑中不能包含Bucket名稱，例如destdir/destobject.txt。*/
    std::string CopyObjectName = "destdir/destobject.txt";

    /* 初始化網絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    /* 指定上傳文件操作時是否覆蓋同名Object。*/
    /* 不指定x-oss-forbid-overwrite時，默認覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為false時，表示允許覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為true時，表示禁止覆蓋同名Object，如果同名Object已存在，程序將報錯。*/
    ObjectMetaData meta;
    meta.addHeader("x-oss-forbid-overwrite", "true");

    CopyObjectRequest request(CopyBucketName, CopyObjectName, meta);
    request.setCopySource(SourceBucketName, SourceObjectName);

    /* 拷貝文件。*/
    auto outcome = client.CopyObject(request);

    if (!outcome.isSuccess()) {
            /* 異常處理。*/
            std::cout << "CopyObject fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* 釋放網絡等資源。*/
    ShutdownSdk();
    return 0;
}

拷貝大文件

以下代碼用于拷貝大文件時禁止覆蓋同名文件：

#include <alibabacloud/oss/OssClient.h>
#include <sstream>
using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
     /* yourEndpoint填寫Bucket所在地域對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* yourRegion填寫Bucket所在地域對應的Region。以華東1（杭州）為例，Region填寫為cn-hangzhou。*/
    std::string Region = "yourRegion";
    /* 填寫源Bucket名稱，例如srcexamplebucket。*/
    std::string SourceBucketName = "srcexamplebucket";
    /* 填寫與源Bucket處于同一地域的目標Bucket名稱，例如destbucket。*/
    std::string CopyBucketName = "destbucket";
    /* 填寫源Object的完整路徑，完整路徑中不能包含Bucket名稱，例如srcdir/scrobject.txt。*/
    std::string SourceObjectName = "srcdir/scrobject.txt";
    /* 填寫目標Object的完整路徑，完整路徑中不能包含Bucket名稱，例如destdir/destobject.txt。*/
    std::string CopyObjectName = "destdir/destobject.txt";

    /* 初始化網絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    conf.signatureVersion = SignatureVersionType::V4;
    /* 從環境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);
    client.SetRegion(Region);

    auto getObjectMetaReq = GetObjectMetaRequest(SourceBucketName, SourceObjectName);
    auto getObjectMetaResult = GetObjectMeta(getObjectMetaReq);
    if (!getObjectMetaResult.isSuccess()) {
        std::cout << "GetObjectMeta fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }
        /* 獲取被拷貝文件大小。*/
    auto objectSize = getObjectMetaResult.result().ContentLength();

    /* 拷貝大文件。*/
    ObjectMetaData metaData;
    std::stringstream ssDesc;
    ssDesc << "/" << SourceBucketName << "/" << SourceObjectName;
    std::string value = ssDesc.str();
    metaData.addHeader("x-oss-copy-source", value);

    /* 指定上傳文件操作時是否覆蓋同名Object。*/
    /* 不指定x-oss-forbid-overwrite時，默認覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為false時，表示允許覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為true時，表示禁止覆蓋同名Object，如果同名Object已存在，程序將報錯。*/
    metaData.addHeader("x-oss-forbid-overwrite", "true");

    InitiateMultipartUploadRequest initUploadRequest(BucketName, ObjectName, metaData);

    /* 初始化分片拷貝事件。*/
    auto uploadIdResult = client.InitiateMultipartUpload(initUploadRequest);
    auto uploadId = uploadIdResult.result().UploadId();
    int64_t partSize = 100 * 1024;
    PartList partETagList;
    int partCount = static_cast<int>(objectSize / partSize);
    /* 計算分片個數。*/
    if (objectSize % partSize != 0) {
        partCount++;
    }

    /* 對每一個分片進行拷貝。*/
    for (int i = 1; i <= partCount; i++) {
        auto skipBytes = partSize * (i - 1);
        auto size = (partSize < objectSize - skipBytes) ? partSize : (objectSize - skipBytes);
        auto uploadPartCopyReq = UploadPartCopyRequest(CopyBucketName, CopyObjectName, SourceBucketName, SourceObjectName,uploadId, i + 1);
        uploadPartCopyReq.setCopySourceRange(skipBytes, skipBytes + size -1);
        auto uploadPartOutcome = client.UploadPartCopy(uploadPartCopyReq);
        if (uploadPartOutcome.isSuccess()) {
            Part part(i, uploadPartOutcome.result().ETag());
            partETagList.push_back(part);
        }
        else {
            std::cout << "UploadPartCopy fail" <<
            ",code:" << outcome.error().Code() <<
            ",message:" << outcome.error().Message() <<
            ",requestId:" << outcome.error().RequestId() << std::endl;
        }

    }

    /* 完成分片拷貝。*/
    CompleteMultipartUploadRequest request(CopyBucketName, CopyObjectName, partETagList, uploadId);

    /* 指定上傳文件操作時是否覆蓋同名Object。*/
    /* 不指定x-oss-forbid-overwrite時，默認覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為false時，表示允許覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為true時，表示禁止覆蓋同名Object，如果同名Object已存在，程序將報錯。*/ 
    request.MetaData().addHeader("x-oss-forbid-overwrite", "true");

    auto outcome = client.CompleteMultipartUpload(request);

    if (!outcome.isSuccess()) {
        /* 異常處理。*/
        std::cout << "CompleteMultipartUpload fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

    /* 釋放網絡等資源。*/
    ShutdownSdk();
    return 0;
}

分片上傳

以下代碼用于分片上傳時禁止覆蓋同名文件：

#include <alibabacloud/oss/OssClient.h>
#include <fstream>

int64_t getFileSize(const std::string& file)
{
        std::fstream f(file, std::ios::in | std::ios::binary);
    f.seekg(0, f.end);
    int64_t size = f.tellg();
    f.close();
    return size;
}

using namespace AlibabaCloud::OSS;

int main(void)
{
    /* 初始化OSS賬號信息。*/
            
    /* yourEndpoint填寫Bucket所在地域對應的Endpoint。以華東1（杭州）為例，Endpoint填寫為https://oss-cn-hangzhou.aliyuncs.com。*/
    std::string Endpoint = "yourEndpoint";
    /* 填寫Bucket名稱，例如examplebucket。*/
    std::string BucketName = "examplebucket";
    /* 填寫Object完整路徑，完整路徑中不能包含Bucket名稱，例如exampledir/exampleobject.txt。*/
    std::string ObjectName = "exampledir/exampleobject.txt";

    /* 初始化網絡等資源。*/
    InitializeSdk();

    ClientConfiguration conf;
    /* 從環境變量中獲取訪問憑證。運行本代碼示例之前，請確保已設置環境變量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。*/
    auto credentialsProvider = std::make_shared<EnvironmentVariableCredentialsProvider>();
    OssClient client(Endpoint, credentialsProvider, conf);

    /* 指定上傳文件操作時是否覆蓋同名Object。*/
    /* 不指定x-oss-forbid-overwrite時，默認覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為false時，表示允許覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為true時，表示禁止覆蓋同名Object，如果同名Object已存在，程序將報錯。*/
    ObjectMetaData meta;
    meta.addHeader("x-oss-forbid-overwrite", "true");

    InitiateMultipartUploadRequest initUploadRequest(BucketName, ObjectName, meta);

    /* 初始化分片上傳事件。*/
    auto uploadIdResult = client.InitiateMultipartUpload(initUploadRequest);
    auto uploadId = uploadIdResult.result().UploadId();
    std::string fileToUpload = "yourLocalFilename";
    int64_t partSize = 100 * 1024;
    PartList partETagList;
    auto fileSize = getFileSize(fileToUpload);
    int partCount = static_cast<int>(fileSize / partSize);
    /* 計算分片個數。*/
    if (fileSize % partSize != 0) {
        partCount++;
    }

    /* 對每一個分片進行上傳。*/
    for (int i = 1; i <= partCount; i++) {
        auto skipBytes = partSize * (i - 1);
        auto size = (partSize < fileSize - skipBytes) ? partSize : (fileSize - skipBytes);
        std::shared_ptr<std::iostream> content = std::make_shared<std::fstream>(fileToUpload, std::ios::in|std::ios::binary);
        content->seekg(skipBytes, std::ios::beg);

        UploadPartRequest uploadPartRequest(BucketName, ObjectName, content);
        uploadPartRequest.setContentLength(size);
        uploadPartRequest.setUploadId(uploadId);
        uploadPartRequest.setPartNumber(i);
        auto uploadPartOutcome = client.UploadPart(uploadPartRequest);
        if (uploadPartOutcome.isSuccess()) {
                Part part(i, uploadPartOutcome.result().ETag());
                partETagList.push_back(part);
        }
        else {
                std::cout << "uploadPart fail" <<
            ",code:" << uploadPartOutcome.error().Code() <<
            ",message:" << uploadPartOutcome.error().Message() <<
            ",requestId:" << uploadPartOutcome.error().RequestId() << std::endl;
        }

    }

    /* 完成分片上傳。*/
    CompleteMultipartUploadRequest request(BucketName, ObjectName);
    request.setUploadId(uploadId);
    request.setPartList(partETagList);

    /* 指定上傳文件操作時是否覆蓋同名Object。*/
    /* 不指定x-oss-forbid-overwrite時，默認覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為false時，表示允許覆蓋同名Object。*/
    /* 指定x-oss-forbid-overwrite為true時，表示禁止覆蓋同名Object，如果同名Object已存在，程序將報錯。*/ 
    request.MetaData().addHeader("x-oss-forbid-overwrite", "true");
    auto outcome = client.CompleteMultipartUpload(request);

    if (!outcome.isSuccess()) {
            /* 異常處理。*/
            std::cout << "CompleteMultipartUpload fail" <<
        ",code:" << outcome.error().Code() <<
        ",message:" << outcome.error().Message() <<
        ",requestId:" << outcome.error().RequestId() << std::endl;
        return -1;
    }

      /* 釋放網絡等資源。*/
    ShutdownSdk();
    return 0;
}

相關文檔