How to use GPIB to transmit a large picture？

[xiaochouyu]

 status = viVPrintf(vi, ":SYST:COMM:GPIB:RTER EOI" + vbCrLf, 0)

status = viSetAttribute(vi, VI_ATTR_TMO_VALUE, 20000)

status = viVPrintf(vi, ":MMEM:MSIS 'C’" + vbCrLf, 0)

status = viVPrintf(vi, ":MMEM:CDIR '\USER\DATA\'" + vbCrLf, 0) 
status = viVPrintf(vi, ":MMEM:DATA? 'FILE.WMF'" + vbCrLf, 0) 

status = viRead(vi, strRes, 72676, retCount)

FileOpen(1, Application.StartupPath + "\FILE.WMF", OpenMode.Output)
Print(1, strRes)
FileClose(1)

"C:\USER\DATA\FILE.WMF" on the instrument, it should be transmitted to the computer, saved as "\FILE.WMF".The result is only 4096 bytes！！！！！

The file start by #560376淄茪 ?? 

[xiaochouyu · Accepted solution]

Dim fanal As String

For i = 0 To x + y + 1
fanal = fanal & "0"

Next

status = viRead(vi, fanal, x + y + 2, retCount) 

FileOpen(1, Application.StartupPath + "\FILE.WMF", OpenMode.Output) '输出文档
Print(1, fanal)
FileClose(1)

I don't know why viRead must assign an initial value equal to the length of the result.
Now all the data can be read out. But the new problem is that the file can't be opened. Even if I delete the header file starting with "#", it won't work.

[xiaochouyu · Accepted solution]

A better way is to use "StringBuilder" instead of "String"!When you use .NET！