It has happened to me too, I don't know if there's a better way to
deal with it, but all I do is create a "timeout" timer that is set to
start at the beginning of a get() and to stop at the end of the Get()
request.
If the timer reaches 0 before the Get() is completed I abort the
operation and the program goes on its way, I usually give it 60
seconds.
Daniele
On 11 April 2011 13:17, David Lewis <dave.le...@simulation-systems.co.uk> wrote:
> I have an application that retrieves a single image over HTTP from a video
> server every 60 seconds. This is does over GPRS so at times can be a little
> slow, but in general there are no issues.
>
> I'm using the THttpCli component to get the Get( ) the images within
> BDS2006, C++ flavour.
>
> However, very occasionally I am seeing that my method that gathers these
> images never finishes, and I'm pretty sure the cause is the Get( ) method in
> the THttpCli.
>
> No exception is thrown, but the method just never returns, and therefore the
> method hangs indefinitely. (2 days and counting)
>
> Is this 'normal' behaviour? Can it be detected and dealt with?
>
>
>
>
> The basic operation of what I'm doing is this:
>
> void __fastcall cImageCaptureClass::me_TimeoutTimerTimer(TObject *Sender)
> {
> cLoggerClass * cl_LoggerClass = cLoggerClass::Instance( ); // Logger
> Singleton
>
> try
> {
> // Set the HTTP paramaters ready for connection
> co_HttpClient->Location = at_FileName;
> co_HttpClient->Username = at_UserName;
> co_HttpClient->Password = at_Password;
> co_HttpClient->URL = "http://"; + at_SnapshotIP +
> "/axis-cgi/jpg/image.cgi?streamprofile=" + at_ImageProfile;
> co_HttpClient->Connection = "Keep-Alive";
>
> co_HttpClient->Get( );
>
> if (IntToStr(co_HttpClient->StatusCode) == 200) // The only code that
> matters to me
> {
> cl_LoggerClass->me_AddLog("Snapshot Status: 200 OK",
> cLoggerClass::LOG_TYPE_SUCCESS, cLoggerClass::LOG_LEVEL_RELEASE);
>
> // A valid reply? Ok, so delete the old image, and copy this temp
> file as the new image
> try
> {
> if (FileExists(at_FinalFileName)) // We have an old image?
> {
> DeleteFile(at_FinalFileName); // Remove old image
> } // else nothing to remove
>
> CopyFile(at_FileName.c_str( ), at_FinalFileName.c_str( ),
> false); // Copy new image
> }
> catch ( ... ) // File Delete/Copy failed. Doesn't matter why.
> {
> cl_LoggerClass->me_AddLog("Snapshot: Error updating new
> file!", cLoggerClass::LOG_TYPE_ERROR, cLoggerClass::LOG_LEVEL_RELEASE);
> }
> }
> else // Not 200 reply? Something failed then. Doesn't really matter
> what.
> {
> cl_LoggerClass->me_AddLog("Snapshot: Aborted with Status: " +
> IntToStr(co_HttpClient->StatusCode) + " ERROR",
> cLoggerClass::LOG_TYPE_ERROR, cLoggerClass::LOG_LEVEL_RELEASE);
> }
> }
> catch ( ... ) // co_HttpClient->Get( ) failed. Doesn't matter why.
> {
> cl_LoggerClass->me_AddLog("Snapshot: Can't Get: " +
> IntToStr(co_HttpClient->StatusCode) + " ERROR",
> cLoggerClass::LOG_TYPE_ERROR, cLoggerClass::LOG_LEVEL_RELEASE);
> }
> }
>
>
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