如何读入字节数组文件内容然后更新它们并写入另一个文件？

Question

我希望 nsis 能够从文件内容读取到字节数组，更新数组，然后将缓冲区的内容写入另一个文件。

我的代码

System::Call "kernel32::GetFileSize(i[=10=],i0)i.s"
Pop 

System::Alloc   ;Reading file contents into a buffer
Pop $buffer
System::Call "kernel32::ReadFile(i[=10=],i$buffer,i,*i.r6,i0)i.s"

loop2:
        StrCpy  $buffer 1 
        StrCmp  '' end
        IntOp   + 1

goto loop2

我希望能够遍历从文件中读取的字节数组并能够更改其内容。（例如 OR 字节）我想节省直接从文件读取字节然后将单个字节写入新文件的时间。所以这就是为什么要使用分配的缓冲区字节数组。那可能吗？我看到nsis本身不支持数组。

Answer 1

NSIS 不支持字节数组，但系统插件结构语法允许您访问内存缓冲区中的原始字节：

!include LogicLib.nsh
!include Util.nsh
ShowInstDetails show

!macro DisplayTestFile
FileOpen [=10=] "$PluginsDir\Test.txt" r
FileRead [=10=] 
FileClose [=10=]
DetailPrint Line1=
!macroend

Section
InitPluginsDir
FileOpen [=10=] "$PluginsDir\Test.txt" w
${If} [=10=] P<> 0
    FileWrite [=10=] "HELLO World$\r$\n"
    FileClose [=10=]
${EndIf}

!insertmacro DisplayTestFile

FileOpen [=10=] "$PluginsDir\Test.txt" a
${If} [=10=] P<> 0
    FileSeek [=10=] 0 Set
    System::Call "KERNEL32::GetFileSize(pr0,p0)i.r1"
    ${IfThen}  = -1 ${|} Abort "Could not get file size" ${|}
    System::Call '*(&i,i0)p.r2' ; Allocate the file size + a zero terminator just in case
    ${If}  P<> 0
        System::Call "KERNEL32::ReadFile(pr0,pr2,ir1,*i,p0)i.r3"
        ${If}  <> 0
            ${For}  0 5 ; Change byte 0..5
                System::Call '*(&i,&i1.r4)' ; Read a byte
                IntOp   | 32
                System::Call '*(&i,&i1 r4)' ; Write a byte
            ${Next}
            FileSeek [=10=] 0 Set
            System::Call "KERNEL32::WriteFile(pr0,pr2,ir1,*i,p0)i.r3"
        ${EndIf}
        System::Free 
    ${EndIf}
    FileClose [=10=]
${EndIf}

!insertmacro DisplayTestFile
SectionEnd

如何读入字节数组文件内容然后更新它们并写入另一个文件？

How to read into byte array file contents and then update them and write into another file?

nsis