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I've just edited my previous reply as it appears that double is 8bytes (64 bits) in managed and unmanaged environments 
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)
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Hi Dave,
native float typically uses 4 bytes, and double doubles that, hence the name.
managed float always uses 4 bytes, and double 8 bytes.
Luc Pattyn [Forum Guidelines] [My Articles]
DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.
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Hi,
three remarks:
1.
shivapriyak wrote: public static extern int func1(ref double param[], int size);
I doubt you need the ref there. Objects (array is object) get passed by reference, so what you get is a pointer to the data anyway. With "ref" you get a pointer to a pointer, which you would then have to accept as a double**param.
2.
I typically don't rely on automatics marshaling, instead I use GCHandle class to pin the object and get its pointer into an IntPtr, then pass that to the native world. However, I am not saying your way could not work (without ref!).
3.
shivapriyak wrote: in direct C application, gives error saying "Array size(i.e. 5) is lesser than the number of values to fill(i.e. 10)".
How the heck can the function now that???
Luc Pattyn [Forum Guidelines] [My Articles]
DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.
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1. I have tried removing 'ref' and giving just double param[] in PInvoke...it didn't work 
2. Tried using GCHandle class as below:
int func1(double param[],int size)
{
GCHandle handle = GCHandle.Alloc(param, GCHandleType.Pinned);
Pinvoke.func1(handle.AddrOfPinnedObject(),size);
}
The Pinvoke class is as:
[DllImport("myFile.dll",EntryPoint="func1",CallingConvention = CallingConvention.StdCall)]
public static extern int func1(IntPtr handle, int size);
But it didn't work...is this correct way? or do i need to tweak at some place.
Thanks,
Priya.
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Hi,
shivapriyak wrote: it didn't work
that does not tell me much
shivapriyak wrote: int func1(double param[],int size)
{
GCHandle handle = GCHandle.Alloc(param, GCHandleType.Pinned);
Pinvoke.func1(handle.AddrOfPinnedObject(),size);
}
looks good, except when done you need to free the GCHandle.
Luc Pattyn [Forum Guidelines] [My Articles]
DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.
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Hello. I'm using SQLite and System.Data.SQLite.
If I create a new table, the file size is 2KB.
After insert 1000 records, the file size will be 34KB.
If I delete all record, the file size remain 34KB.
If I send SELECT command, the table is empty.
Why ?
Thanks.
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stancrm wrote: Hello. I'm using SQLite and System.Data.SQLite.
If I create a new table, the file size is 2KB.
After insert 1000 records, the file size will be 34KB.
If I delete all record, the file size remain 34KB.
If I send SELECT command, the table is empty.
Why ?
Because a delete does not reclaim disk space (that would be a very wasteful use of system resources). Databases don't tend to allocate space as records are added, they allocate space in blocks and then insert records to the allocated space (it's much more efficient for them to do this as it results in less I/O activity on the disk).
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Hi,
you are getting an empty table because you deleted all records before. The file size of the database will not shrink if you delete rows because that would mean a reordering of the internal structure (db-records are stored in pages etc.). Some databases (especially for mobile applications) offer a shrink-command. This will result in the reordering and a smaller file.
At least: Please choose the correct forum for your question, I think "General Database" would be a better place.
Regards
Sebastian
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Hi friend i am creating WindowDesktop application that will upload a large size of file to the server.
now when i upload file of small size its uploaded with no problem but when i upload large size of 62Mb or so it throw exception. can any body tell me that how can i upload large file and can i also pause uploading and resume Uploading feature
<pre
filestream="" stream="new" filestream("c:\\xyz.zip",="" filemode.open);
="" byte[]="" buffer="new" byte[stream.length];
="" int="" i="0;
" while="" ((i="stream.Read(buffer,0," buffer.length))>0)
="" {
="" ftpwebrequest="" request="(FtpWebRequest)FtpWebRequest.Create("ftp://ftp.abc.com/"" +="" path.getfilename("c:\\xyz.zip"));
="" try
="" {
="" request.method="WebRequestMethods.Ftp.UploadFile;
" request.credentials="new" networkcredential("demo123",="" "demo123");
="" request.usepassive="true;
" request.usebinary="true;
" request.keepalive="false;
"
="" request.timeout="int.MaxValue;
" reqstream="request.GetRequestStream();
" reqstream.write(buffer,="" 0,="" buffer.length);
="" reqstream.beginwrite(buffer,="" buffer.length,="" callback,="" "aa");
="" reqstream.close();
="" }
="" catch="" (exception="" ex)
="" stream.close();="">
i use both Write and BeginWrite method
WANTED wasim khan(Killed 50 Innocent Buggs, Distroyed 200 Exception, make 5 Project Hostage) any Compnay Hire him will pay 30,000. Best place where u can get him is Sorcim Technologies Murre Road RWP
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We cannot know unless you tell us what Expetion you are getting
Vuyiswa Maseko,
Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/
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Hi Vuyiswa Maseko
Error is "Unable to write data to the transport connection: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full."
WANTED wasim khan(Killed 50 Innocent Buggs, Distroyed 200 Exception, make 5 Project Hostage) any Compnay Hire him will pay 30,000. Best place where u can get him is Sorcim Technologies Murre Road RWP
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musefan is Right increase the Buffer and see what happends
Vuyiswa Maseko,
Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/
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I'm actually suggesting to reduce the buffer size.. but I assume that is what you meant anyway 
Life goes very fast. Tomorrow, today is already yesterday.
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Its one of those Days
today its the Final day of my Project
Am tired
Vuyiswa Maseko,
Few companies that installed computers to reduce the employment of clerks have realized their expectations.... They now need more and more expensive clerks even though they call them "Developers" or "Programmers."
C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.somee.com
http://www.vuyiswamaseko.tiyaneProperties.co.za
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/
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I see
Just out of interested what is your project? is it a course project?
Life goes very fast. Tomorrow, today is already yesterday.
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Interesting
Life goes very fast. Tomorrow, today is already yesterday.
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I have not really read your code but my first guess would be your buffer array size is causing the issue. The buffer should not contain all the data else you may as well use the stream itself.
Try a buffer size of 1024 - that's a common size that is used.
Life goes very fast. Tomorrow, today is already yesterday.
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yes i set the buffer size to 1024
it working but in process it threw exception couple of time "The underlying connection was closed: An unexpected error occurred on a receive."
WANTED wasim khan(Killed 50 Innocent Buggs, Distroyed 200 Exception, make 5 Project Hostage) any Compnay Hire him will pay 30,000. Best place where u can get him is Sorcim Technologies Murre Road RWP
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Try creating the response stream (and closing it) outside of the while loop then just write the buffer contents in each loop.
Life goes very fast. Tomorrow, today is already yesterday.
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Two things.
i = stream.Read(buffer,0, buffer.Length)
That's fine, but later on
reqStream.Write(buffer, 0, buffer.Length);
You try to send the whole buffer, but if you only read 215 bytes in to the buffer in the first place then you would be sending garbage.
You should use the variable you set before to make sure you only send what you read in.
reqStream.Write(buffer, 0, i);
It would probably be fine since the whole file would be put in the buffer, but just to be safe.
As for your other problem, if you use BeginWrite you need to wait until the callback before closing the stream, at the moment you could be closing the stream while you're still trying to send data down it.
If you where to use the regular Write method, you would probably want to check how many bytes where actually written and make sure you send all of your data.
My current favourite word is: Delicious!
-SK Genius
Game Programming articles start - here[ ^]-
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Hi
I have used multiple ways to restore mysql schema through c# but it doesnot seems to work as the database doesnot restores properly,
please tell me what to do, my code for restore is as under
string filename = backupName;
StreamWriter file = new StreamWriter(filename);
file.WriteLine("@ECHO off");
file.WriteLine("cls");
file.WriteLine("set DBchoice=%1%");
file.WriteLine("set User=%2%");
file.WriteLine("set Password=%3%");
file.WriteLine("set pathchoice=%4%");
file.WriteLine("");
file.WriteLine("@REM Remove double quotes from the path");
file.WriteLine("@REM SET pathchoice=%pathchoice:\"=%");
file.WriteLine("@REM SET pathchoice=%pathchoice:\"=%");
file.WriteLine("");
file.WriteLine("mysql -u " + Id + " --password=" + pwd + " " + dbName + "<" + path);
file.Close();
the other one is
StreamReader file = new StreamReader(path);
ProcessStartInfo proc = new ProcessStartInfo();
string cmd = string.Format(@"-u{0} -p{1} -h{2} {3} {4} {5}", Id, pwd, serverHost, dbName + "<", path);
proc.FileName = "mysql";
proc.RedirectStandardInput = true;
proc.RedirectStandardOutput = false;
proc.Arguments = cmd;
proc.UseShellExecute = false;
Process p = Process.Start(proc);
string res;
res = file.ReadToEnd();
p.StandardInput.Write(res);
p.WaitForExit();
file.Close();
return "Data restored successfully";
please give me any suggestions
regards,
Mariam
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StreamReader file = new StreamReader(fromFile);
string res;
res = file.ReadToEnd();
file.Close();
ProcessStartInfo proc = new ProcessStartInfo();
proc.FileName = "mysql.exe";
proc.CreateNoWindow = true;
proc.RedirectStandardInput = true;
proc.Arguments = string.Format(" -u{0} -p{1} -h{2} -D{3}", userName, password, serverName, databaseName);
proc.UseShellExecute = false;
p.StandardInput.Write(res);
p.StandardInput.WriteLine("quit");
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I've try this code and it's work fine!
StreamReader file = new StreamReader(restoreFile);
ProcessStartInfo proc = new ProcessStartInfo();
string cmdArgs = string.Format(@"-u{0} -p{1} -h{2} {3}", UserID, Password, Location, DatabaseName);
proc.FileName = "C:\\Program Files\\MySQL\\MySQL Server 5.1\\bin\\mysql.exe";
proc.RedirectStandardInput = true;
proc.RedirectStandardOutput = false;
proc.Arguments = cmdArgs;
proc.UseShellExecute = false;
Process p = Process.Start(proc);
string res = file.ReadToEnd();
file.Close();
p.StandardInput.WriteLine(res);
p.Close();
"&lt;" or "<" can causes error because ProcessStartInfo doesn't recognize it!
Good Luck!
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I have been looking around because I have big dumps (200MB) and .NET kept going out of memory.
The solution is:
ProcessStartInfo proc = new ProcessStartInfo();
string cmdArgs = string.Format(@"-u{0} -p{1} -h{2} {3}", UserID, Password, Location, DatabaseName);
proc.FileName = "C:\\Program Files\\MySQL\\MySQL Server 5.1\\bin\\mysql.exe";
proc.RedirectStandardInput = true;
proc.RedirectStandardOutput = false;
proc.Arguments = cmdArgs;
proc.UseShellExecute = false;
Process p = Process.Start(proc);
p.StandardInput.WriteLine("source " + restoreFile);
p.Close();
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