You can see the usage in 
MdeModulePkg\Universal\Network\UefiPxeBcDxe\PxeBcDhcp.c line 1618. The detail 
print format can be found in MdePkg\Include\Library\PrintLib.h

>-----Original Message-----
>From: edk2-devel [mailto:[email protected]] On Behalf Of
>krishnaLee
>Sent: Wednesday, August 02, 2017 5:20 PM
>To: [email protected]
>Subject: [edk2] [edk2-UDK2017] issue about AsciiPrint
>
>Hi All,
>
>This function will output nothing or strange-output in my real Lenovo_Q270
>machine, follow is the key point:
>
>
>//for(UINTN j=0;j<sizeof(RSDP->Signature);j++)
>//{
>                        //output byte by byte,or custom range...,or just some 
> specified
>bytes in the string...
>
>//AsciiPrint("%c",j,SignatureStr[j]);
>//}
>------------------------------------------------------------------------------------------
>I had read the Print function note,but I don't understand  its meaning for 
>ascii
>string using AsciiPrint, for example:If someone want print a part of 
>ascii-string
>byte by byte...,
>I am newer to write uefi code,May be I mis-understand it,Can anybody clarify
>it ,or give the full instruction about AsciiPrint.
>type:
>%
>Print a %%.
>c
>The argument is a Unicode      character. ASCII characters can be printed using
>this type too by      making sure bits 8..15 of the argument are set to 0.
>
>
>
>
>attachment is the full test code.
>
>
>my-platform-infomation:
>udk2017-vs2015x86
>build command:build -p ShellPkg\ShellPkg.dsc -m
>ShellPkg\Application\querytable\querytable.inf -a X64 -b RELEASE
>uefi shell version 2.2
>cpu:Intel (r) G4520 3.6Ghz
>mem:Sumsang 16G 2133
>motherboard:Lenovo_Q270
>
>
>
>
>
>
>
>
>
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