我使用 <ItemGroup>
<Reference Include="DevExpress.Charts.v18.2.Core, Version=18.2.3.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a, processorArchitecture=MSIL">
<SpecificVersion>False</SpecificVersion>
<HintPath>..\dll_references\DevExpress.Charts.v18.2.Core.dll</HintPath>
</Reference>
</ItemGroup>
（命令行工具）执行以下命令，将文件上传到Google驱动器：
curl以下带有curl --request POST \
'https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart' \
--header 'Authorization: Bearer "..."' \
-F "metadata={name : 'backup.zip'};type=application/json;charset=UTF-8" \
-F "@backup.zip;type=application/zip"
的程序只能使用libcurl，URL并使用formdata上载文件：
header如何在#include <stdio.h>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if(curl) {
struct curl_slist *chunk= NULL;
chunk= curl_slist_append(chunk, "Authorization: Bearer \"...\"");
curl_slist_append(chunk, "Accept: application/json");
curl_slist_append(chunk, "Content-Type: application/json");
curl_mimepart *part= NULL;
curl_mime_type(part, "application/octet-stream");
struct curl_httppost* formpost = NULL;
struct curl_httppost* lastptr = NULL;
curl_formadd(&formpost,
&lastptr,
CURLFORM_COPYNAME, "sendfile",
CURLFORM_FILE, "main.c",
CURLFORM_END);
/* Perform the request, res will get the return code */
//curl_easy_setopt(curl, CURLOPT_URL, "https://www.googleapis.com/drive/v3/files");
curl_easy_setopt(curl, CURLOPT_URL, "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
curl_easy_setopt(curl, CURLOPT_MIMEPOST, part);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
中指定-F "metadata={name : 'backup.zip'};type=application/json;charset=UTF-8"？
我用libcurl尝试过，但这没用。
答案 0 :(得分：0)
您正在将HTTP请求的顶级Content-Type标头设置为application/json，这是错误的。根据Google的文档Send a multipart upload request，它必须是multipart/related。
您显示的命令行将类型application/json的MIME部分插入到POST表单数据中，但是您在代码中没有执行相同的操作。
此外，您不应同时使用CURLOPT_MIMEPOST和CURLOPT_HTTPPOST。使用一个或另一个，而不是两者。 CURLOPT_HTTPPOST已弃用CURLOPT_MIMEPOST，并被CURLOPT_MIMEPOST 替换。而且，您甚至都没有将正确的输入值传递给curl_mime*。它期望curl_mimepart*，而不是#include <stdio.h>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if (curl)
{
/* set custom HTTP headers */
struct curl_slist *header = NULL;
// uncomment this if you are not using libcurl 7.61.0 or later...
//
// header = curl_slist_append(header, "Authorization: Bearer \"...\"");
//
header = curl_slist_append(header, "Content-Type: multipart/related");
header = curl_slist_append(header, "Accept: application/json");
/* set MIME post content */
curl_mime *mime = curl_mime_init(curl);
curl_mimepart *part = curl_mime_addpart(mime);
curl_mime_name(part, "metadata");
curl_mime_type(part, "application/json;charset=UTF-8");
curl_mime_data(part, "{\"name\" : \"backup.zip\"}", CURL_ZERO_TERMINATED);
part = curl_mime_addpart(mime);
curl_mime_type(part, "application/zip");
curl_mime_filedata(part, "backup.zip");
/* Perform the request, res will get the return code */
curl_easy_setopt(curl, CURLOPT_URL, "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart");
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header);
curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
// comment this out if you are not using libcurl 7.61.0 or later...
//
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BEARER);
curl_easy_setopt(curl, CURLOPT_XOAUTH2_BEARER, "...");
//
res = curl_easy_perform(curl);
/* always cleanup */
curl_slist_free_all(header);
curl_mime_free(mime);
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
。
请尝试以下类似操作：
Content-Type或者也许是这样（我不确定使用MIME正文时指定HTTP #include <stdio.h>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
if (curl)
{
/* set custom HTTP headers */
struct curl_slist *header = NULL;
// uncomment this if you are not using libcurl 7.61.0 or later...
//
// header = curl_slist_append(header, "Authorization: Bearer \"...\"");
//
header = curl_slist_append(header, "Accept: application/json");
/* set MIME post content */
curl_mime *mime = curl_mime_init(curl);
curl_mime *rel = curl_mime_init(curl);
curl_mimepart *part = curl_mime_addpart(rel);
curl_mime_name(part, "metadata");
curl_mime_type(part, "application/json;charset=UTF-8");
curl_mime_data(part, "{\"name\" : \"backup.zip\"}", CURL_ZERO_TERMINATED);
part = curl_mime_addpart(rel);
curl_mime_type(part, "application/zip");
curl_mime_filedata(part, "backup.zip");
part = curl_mime_addpart(mime);
curl_mime_type(part, "multipart/related");
curl_mime_subparts(part, rel);
/* Perform the request, res will get the return code */
curl_easy_setopt(curl, CURLOPT_URL, "https://www.googleapis.com/upload/drive/v3/files?uploadType=multipart");
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, header);
curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
// comment this out if you are not using libcurl 7.61.0 or later...
//
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BEARER);
curl_easy_setopt(curl, CURLOPT_XOAUTH2_BEARER, "...");
//
res = curl_easy_perform(curl);
/* always cleanup */
curl_slist_free_all(header);
curl_mime_free(mime);
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
的正确方法-关于此主题的文档和示例非常有限，我发现的大多数示例都是针对SMTP的，不是HTTP）：
<ion-slides [options]="slideOpts" (ionSlideDidChange)="slideDidChange()" #myslides style="height:100%; width:100%;">
<ion-slide>
<app-noticed-events style="height:100%; width:100%;"></app-noticed-events>
</ion-slide>
<ion-slide>
<app-home style="height:100%; width:100%;"></app-home>
</ion-slide>
<ion-slide>
<app-map style="height:100%; width:100%;"></app-map>
</ion-slide>
</ion-slides>