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Nov 2, 2018 · A quick and practical guide to PDF conversions in Java. ... More specifically, we'll describe how to save PDFs as image files, such as PNG or ... The continue and until commands are useful ways to move from breakpoint to breakpoint within a program But the really cool way to move around inside your code is one instruction at a time, watching things happen as you go This is what single-stepping is all about, and with gdb it's remarkably easy Single-stepping is simple in principle: You type a gdb command that executes a single machine instruction You type the command again, and you execute the instruction after that In between instruction executions, you can look at registers, memory locations, and other things that might provide telltales to your program's operation There are two commands that single-step at the machine-instruction level: stepi and nexti The i at the end of each command indicates that these step by machine instruction, and not by C source code statements The two related commands, step and next, work with C and Modula 2 code only (Never forget that the overwhelming majority of gdb's users are debugging C code at the C source code level, and not assembly code at all) The nexti and stepi instructions have shorthand forms: ni and si The difference between stepi and nexti may seem odd at first: Stepi executes the next machine instruction in the execution path, irrespective of which instruction it is, whereas nexti executes the next machine instruction in the execution path unless that instruction is a CALL instruction If nexti executes a CALL instruction, it executes the whole of the subroutine invoked by that CALL instruction without pausing Users of Borland's programming languages are probably familiar with two debugging commands built into Borland's interactive environments: Step Over and Trace Into Trace Into corresponds to gdb's stepi command, and Step Over corresponds to gdb's nexti command The idea is this: While you're stepping along through a program, you may wish to avoid climbing down into subroutines and stepping through them instruction by instruction unless you're debugging the subroutine This is especially true of subroutines that are in fact calls into the standard C library If you're hitting a bug, it's unlikely to be in the C library (Suspect your own code in virtually every case Those library routines are extremely robust!) So, assuming you can trust the C library functions your program is calling, you probably don't want to waste time going through them an instruction at a time The same may be true of subroutines in your own personal code library You may have written them and proven them out long ago, so rather than go through them an instruction at a time, you'd prefer to execute the whole subroutine at once If this is the case, you should single-step with nexti When nexti encounters a CALL instruction, it executes CALL and all the instructions within the subroutine invoked by that CALL instruction as though the whole subroutine were a single instruction Boom! The subroutine has run, and you go on to the next instruction in the code execution sequence Stepi, on the other hand, treats all machine instructions identically: It follows the CALL instruction down into its subroutine and executes each of the subroutine's instructions in turn, coming back when the subroutine executes a RET instruction It really is that simple The trick, as usual, is knowing what's happening based on what you see on your screen Without some preparation, nexti and stepi are pretty closed-mouthed and unhelpful Stop at a breakpoint and execute nexti, and this is what you'll see: (gdb) nexti 0x80483d9 in main () The hex number is the 32-bit value of the program counter at hat instruction And that's all it tells you You can, however, instruct gdb to be a little more verbose This is done with the display command, using the following syntax: (gdb) display /i $pc 1: x/i $eip 0x80483d6 <main+6>. convert pdf to image in java: jPDFImages - Java PDF Library to Convert Extract PDF to / from ... convert base64 pdf to image javascript base64-to-image - npm
May 14, 2016 · base64 to image converter. ... Bring the best of OSS JavaScript development to your projects with npm Orgs - private packages & team ... pdf to png conversion java Downloading a base 64 PDF from an api request in Javascript.
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Feb 21, 2014 · The project used the exhibition document function. The original server: FlashPaper2 + Java. However, at the very beginning of your assembly language main program are some required instructions, sometimes called prolog code, that create a stack frame for your program I explain this in detail in the next chapter; consider it a "forward reference" for now That prolog is required, and all the programs you'll see me present in the next chapter will have this identical sequence at their beginnings: main: push ebp ; Set up stack frame for debugger mov ebp,esp push ebx ; Program must preserve ebp, ebx, esi, & edi push esi push edi ;;; Everything before this is boilerplate; use it for all ordinary apps! Following the main label are exactly five instructions These instructions are crucial for your program to be able to access the stack and avoid trashing important register values, and the GNU debugger gdb makes the assumption that in nearly all cases you'll want to begin single-stepping after these instructions have executed (Its reasoning: Your program won't work correctly until they've executed, so why waste the time stepping through them ) So, when you request a breakpoint on the main program with this command: break main gdb will actually set a breakpoint six instructions after the label main This guarantees that the stack frame has been set up, allowing you to access variables on the stack These variables include any command line parameters passed to your program at startup so it is an important consideration If you really and truly do want to set a breakpoint precisely at the main label, you need to execute this command: break *main There's not a whole lot of advantage in it, unless you want to watch stack frame setup actually happen (There's nothing wrong with that, of course But once you've seen it happen a time or two there's not much sense in watching it every time you debug!). 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Nov 2, 2018 · More specifically, we'll describe how to save PDFs as image files, such as ... and extract the texts, by using multiple Java open-source libraries. java pdf to image high resolution Convert PDF document to PNG image files – Knowledge Base ...
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