"Chua Wen Ching" <chua_wen_ching@nospam.hotmail.com> wrote in message
news:87185FB0-0EF7-4FD8-B734-09B0B2735587@microsoft.com...
> Hi,
>
> I have doubts. From p/invoke and most site, they recommend to use this.
>
> Example1:
> [DllImport("kernel32.dll")]
> static extern bool ReadFile(IntPtr hFile, byte[] lpBuffer,
> uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, IntPtr
> lpOverlapped);
>
> But I only want to read 1 byte at a time.
>
> Example2:
> [DllImport("kernel32.dll")]
> static extern bool ReadFile(IntPtr hFile, ref byte lpBuffer, uint
> nNumberOfBytesToRead, ref uint lpNumberOfBytesRead, IntPtr lpOverlapped);
>
> Can i do this instead?
>
> If just say, no choice i have to stick to Example1, when i run that
> function, and only read lpBuffer[0], it does not return what i expected.
>
> But if only follow Example2, it will. But the only issue i have is,
>
> Sample snippet:
>
> for(;;)
> {
> // some processing
>
> bool test = ReadFile(...)..
> }
>
> so basically in this loop, it will read till 8 times of data...
>
> 00 11 22 33 44 55 66 77 88 // just say this is what i expect it to give me
>
> but it give me instead
>
> 00 11 22 33 44 55 66 00 01 // wrong! Sometimes i get this, and sometimes i
> get the above one.
>
> Why?
>
> I try to test on separate machine, or restart my machine. Sometimes i just
> get either the one with 88 99 or 00 01!
>
> I have an existing C SDK, and it is running smoothly. That is why i can
> compare whether my .NET SDK is working properly or not.
>
> Can anyone provide me any guideslines please?
> --
> Regards,
> Chua Wen Ching
> Visit us at http://www.necoders.com

"Chua Wen Ching" <chua_wen_ching@nospam.hotmail.com> wrote in message
news:87185FB0-0EF7-4FD8-B734-09B0B2735587@microsoft.com...
> Hi,
>
> I have doubts. From p/invoke and most site, they recommend to use this.
>
> Example1:
> [DllImport("kernel32.dll")]
> static extern bool ReadFile(IntPtr hFile, byte[] lpBuffer,
> uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, IntPtr
> lpOverlapped);
>
> But I only want to read 1 byte at a time.
>
> Example2:
> [DllImport("kernel32.dll")]
> static extern bool ReadFile(IntPtr hFile, ref byte lpBuffer, uint
> nNumberOfBytesToRead, ref uint lpNumberOfBytesRead, IntPtr lpOverlapped);
>
> Can i do this instead?
>
> If just say, no choice i have to stick to Example1, when i run that
> function, and only read lpBuffer[0], it does not return what i expected.
>
> But if only follow Example2, it will. But the only issue i have is,
>
> Sample snippet:
>
> for(;;)
> {
> // some processing
>
> bool test = ReadFile(...)..
> }
>
> so basically in this loop, it will read till 8 times of data...
>
> 00 11 22 33 44 55 66 77 88 // just say this is what i expect it to give me
>
> but it give me instead
>
> 00 11 22 33 44 55 66 00 01 // wrong! Sometimes i get this, and sometimes i
> get the above one.
>
> Why?
>
> I try to test on separate machine, or restart my machine. Sometimes i just
> get either the one with 88 99 or 00 01!
>
> I have an existing C SDK, and it is running smoothly. That is why i can
> compare whether my .NET SDK is working properly or not.
>
> Can anyone provide me any guideslines please?
> --
> Regards,
> Chua Wen Ching
> Visit us at http://www.necoders.com

> Can i do this instead?

>when i run that
>function, and only read lpBuffer[0], it does not return what i expected.