当我尝试对无法访问的服务器执行一些 HTTP_POST、HTTP_DELETE 操作时,返回代码有时为 -1。因为我的应用程序正在崩溃。
这是我的示例代码。
我的应用程序代码是用 C++ 编写的,我也在其中读取响应和响应 header 。
lCode = curl_easy_setopt(curlHandle, CURLOPT_HEADERFUNCTION,
HttpClientImplCurl::recvFunctionHeader);
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_setopt CURLOPT_HEADERFUNCTION returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);
return http_code;
}
lCode = curl_easy_setopt(curlHandle, CURLOPT_WRITEHEADER,
&readResHeaderBuffer);
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_setopt CURLOPT_WRITEHEADER returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);
return http_code;
}
lCode = curl_easy_setopt(curlHandle, CURLOPT_WRITEFUNCTION,
HttpClientImplCurl::recvFunction);
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_setopt WRITEFUNCTION returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);
return http_code;
}
lCode = curl_easy_setopt(curlHandle, CURLOPT_WRITEDATA,
&readResBuffer);
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_setopt WRITEDATA returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);
return http_code;
}
lCode = curl_easy_setopt(curlHandle, CURLOPT_CUSTOMREQUEST, "DELETE"); /* !!! */
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_setopt CURLOPT_CUSTOMREQUEST returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);
return http_code;
}
lCode = curl_easy_setopt(curlHandle, CURLOPT_POSTFIELDS, aInRemovedata.getBuffer()); /* data goes here */
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_setopt CURLOPT_POSTFIELDS returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);
return http_code;
}
lCode = curl_easy_perform(curlHandle);
if (lCode != CURLE_OK) {
LOG(LOG_CRIT, "CURL failure: curl_easy_perform returned %d\n", lCode);
curl_slist_free_all(lHeaders);
errorBuff = curl_easy_strerror(lCode);---->my doubt is when i am geting "-1", this line is caused the crash.
return http_code;
}
我的回调如下,
size_t
HttpClientImplCurl::recvFunctionHeader(void *aInBuf, size_t aInSize,
size_t aInNmemb, void* aInUserp)
{
fprintf(stderr, "curl error: too small buffer in recv2\n");
((std::string*)aInUserp)->append((char*)aInBuf, aInSize * aInNmemb);
return aInSize * aInNmemb;
}
// Private static callback
size_t
HttpClientImplCurl::recvFunction(void *aInBuf, size_t aInSize,
size_t aInNmemb, void* aInUserp)
{
fprintf(stderr, "curl error: too small buffer in recv1\n");
((std::string*)aInUserp)->append((char*)aInBuf, aInSize * aInNmemb);
return aInSize * aInNmemb;
}
请帮我解决这个问题,为什么我们偶尔会得到“-1”而不是“28”。
这是函数签名,其中 errorBuf 作为参数
int
HttpClientImplCurl::put(const HttpClient& aInClient,const base::Buffer& aInPutdata,
base::Buffer& aOutRecvBuf,base::Buffer& aOutRecvHeaderBuf,const char*& errorBuff)
最佳答案
您可以尝试设置 CURLOPT_ERRORBUFFER 和 CURLOPT_VERBOSE 来获取有关为什么 curl_easy_perform 返回的值为 -1 的更多信息。
关于c++ - 当服务器无法访问时,curl_easy_perform 返回 -1,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20147975/