Não é possível obter o módulo NaCl C ++ para carregar o arquivo no aplicativo empacotado
Eu tenho um aplicativo empacotado no chrome que também inclui um módulo PNaCl / NaCl C ++, além de alguns arquivos de dados que o módulo NaCl precisa ler. No entanto, não consigo fazer a leitura nos arquivos.
Configurei-o de acordo com toda a documentação e exemplos oficiais que pude encontrar, bem como a resposta para:Como incluir um arquivo de dados em um aplicativo chrome para que um módulo cliente nativo leia
A demonstração nacl_io que acompanha o SDK é capaz de fazer isso, mas está em C, não em C ++.
Eu vim com um exemplo simples, que postarei abaixo. Quando você pressiona o botão na página, o módulo NaCl deve carregar o primeiro caractere de test.txt e mostrá-lo. A partir de agora, ele sempre responde com "-100" (o valor do erro que inseri), o que significa que não foi possível abrir o arquivo, e não com o primeiro caractere do arquivo.
Alguém pode sugerir algumas alterações que permitiriam que funcionasse corretamente e carregasse o arquivo?
Para executá-lo, pelo menos no Mac, use este comando, com todos os arquivos no diretório ./file-test: / Applications / Google \ Chrome.app/Contents/MacOS/Google \ Chrome --load- and-launch-app =. / arquivo-teste
Observe que se você tentar usar isso, provavelmente precisará alterar o caminho NACL_SDK_ROOT no makefile.
file_test.cc#include "ppapi/cpp/instance.h"
#include "ppapi/cpp/module.h"
#include "ppapi/cpp/var.h"
#include "nacl_io/nacl_io.h"
#include "sys/mount.h"
class FileTestInstance : public pp::Instance {
public:
explicit FileTestInstance(PP_Instance instance) : pp::Instance(instance)
{
// initialize nacl file system
nacl_io_init_ppapi(instance, pp::Module::Get()->get_browser_interface());
// mount the http root at /http
mount("", "/http", "httpfs", 0, "");
}
virtual ~FileTestInstance() {}
// Receive message from javascript
virtual void HandleMessage(const pp::Var& var_message) {
// Open and load from the file
int c;
FILE *file;
file = fopen("/http/test.txt", "r");
if (file) {
c = getc(file);
fclose(file);
} else {
c = -100;
}
// Send message to JavaScript
pp::Var var_reply(c);
PostMessage(var_reply);
}
};
class FileTestModule : public pp::Module {
public:
FileTestModule() : pp::Module() {}
virtual ~FileTestModule() {}
virtual pp::Instance* CreateInstance(PP_Instance instance) {
return new FileTestInstance(instance);
}
};
namespace pp {
Module* CreateModule() {
return new FileTestModule();
}
} // namespace pp
index.html<!DOCTYPE html>
<html>
<head>
<title>File Test</title>
<script type="text/javascript" src="script.js"></script>
</head>
<body>
<h1>File Test</h1>
<input type="button" id="test" name="test" value="Test" />
<p><b>Output:</b><p>
<div id="output">
</div>
<p>
<div id="listener">
<embed id="file_test" width=0 height=0 src="file_test.nmf" type="application/x-pnacl" />
</div>
</p>
</body>
</html>
script.js// outgoing messages
function postMessage(message) {
var nacl_module = document.getElementById('file_test')
nacl_module.postMessage(message);
}
// incoming messages
function handleMessage(message_event) {
var outputDiv = document.getElementById('output');
outputDiv.textContent = message_event.data;
}
// button action
function buttonClicked() {
postMessage("file");
}
// set up
function init() {
// add listener to nacl module
var listener = document.getElementById('listener');
listener.addEventListener('message', handleMessage, true);
// add action to button
document.getElementById("test").onclick = buttonClicked;
}
window.onload = init;
main.js/**
* Listens for the app launching then creates the window
*/
chrome.app.runtime.onLaunched.addListener(function() {
// Center window on screen.
var screenWidth = screen.availWidth;
var screenHeight = screen.availHeight;
var width = 600;
var height = 600;
chrome.app.window.create('index.html', {
id: "File-TestID",
bounds: {
width: width,
height: height,
left: Math.round((screenWidth-width)/2),
top: Math.round((screenHeight-height)/2)
}
});
});
file_test.nmf{
"program": {
"portable": {
"pnacl-translate": {
"url": "file_test.pexe"
}
}
}
}
Makefile#
# Get pepper directory for toolchain and includes.
#
# If NACL_SDK_ROOT is not set, then assume where it can be found.
#
THIS_MAKEFILE := $(abspath $(lastword $(MAKEFILE_LIST)))
NACL_SDK_ROOT ?= $(abspath $(dir $(THIS_MAKEFILE))../../nacl_sdk/pepper_33)
# Project Build flags
WARNINGS := -Wno-long-long -Wall -Wswitch-enum -pedantic -Werror
CXXFLAGS := -pthread -std=gnu++98 $(WARNINGS)
#
# Compute tool paths
#
GETOS := python $(NACL_SDK_ROOT)/tools/getos.py
OSHELPERS = python $(NACL_SDK_ROOT)/tools/oshelpers.py
OSNAME := $(shell $(GETOS))
RM := $(OSHELPERS) rm
PNACL_TC_PATH := $(abspath $(NACL_SDK_ROOT)/toolchain/$(OSNAME)_pnacl)
PNACL_CXX := $(PNACL_TC_PATH)/bin/pnacl-clang++
PNACL_FINALIZE := $(PNACL_TC_PATH)/bin/pnacl-finalize
CXXFLAGS := -I$(NACL_SDK_ROOT)/include -I$(NACL_SDK_ROOT)/include/pnacl
LDFLAGS := -L$(NACL_SDK_ROOT)/lib/pnacl/Release -lppapi_cpp -lppapi -lnacl_io
#
# Disable DOS PATH warning when using Cygwin based tools Windows
#
CYGWIN ?= nodosfilewarning
export CYGWIN
# Declare the ALL target first, to make the 'all' target the default build
all: file_test.pexe
clean:
$(RM) file_test.pexe file_test.bc
file_test.bc: file_test.cc
$(PNACL_CXX) -o $@ #
# Get pepper directory for toolchain and includes.
#
# If NACL_SDK_ROOT is not set, then assume where it can be found.
#
THIS_MAKEFILE := $(abspath $(lastword $(MAKEFILE_LIST)))
NACL_SDK_ROOT ?= $(abspath $(dir $(THIS_MAKEFILE))../../nacl_sdk/pepper_33)
# Project Build flags
WARNINGS := -Wno-long-long -Wall -Wswitch-enum -pedantic -Werror
CXXFLAGS := -pthread -std=gnu++98 $(WARNINGS)
#
# Compute tool paths
#
GETOS := python $(NACL_SDK_ROOT)/tools/getos.py
OSHELPERS = python $(NACL_SDK_ROOT)/tools/oshelpers.py
OSNAME := $(shell $(GETOS))
RM := $(OSHELPERS) rm
PNACL_TC_PATH := $(abspath $(NACL_SDK_ROOT)/toolchain/$(OSNAME)_pnacl)
PNACL_CXX := $(PNACL_TC_PATH)/bin/pnacl-clang++
PNACL_FINALIZE := $(PNACL_TC_PATH)/bin/pnacl-finalize
CXXFLAGS := -I$(NACL_SDK_ROOT)/include -I$(NACL_SDK_ROOT)/include/pnacl
LDFLAGS := -L$(NACL_SDK_ROOT)/lib/pnacl/Release -lppapi_cpp -lppapi -lnacl_io
#
# Disable DOS PATH warning when using Cygwin based tools Windows
#
CYGWIN ?= nodosfilewarning
export CYGWIN
# Declare the ALL target first, to make the 'all' target the default build
all: file_test.pexe
clean:
$(RM) file_test.pexe file_test.bc
file_test.bc: file_test.cc
$(PNACL_CXX) -o $@ $< -O2 $(CXXFLAGS) $(LDFLAGS)
file_test.pexe: file_test.bc
$(PNACL_FINALIZE) -o $@ $<
lt; -O2 $(CXXFLAGS) $(LDFLAGS)
file_test.pexe: file_test.bc
$(PNACL_FINALIZE) -o $@ #
# Get pepper directory for toolchain and includes.
#
# If NACL_SDK_ROOT is not set, then assume where it can be found.
#
THIS_MAKEFILE := $(abspath $(lastword $(MAKEFILE_LIST)))
NACL_SDK_ROOT ?= $(abspath $(dir $(THIS_MAKEFILE))../../nacl_sdk/pepper_33)
# Project Build flags
WARNINGS := -Wno-long-long -Wall -Wswitch-enum -pedantic -Werror
CXXFLAGS := -pthread -std=gnu++98 $(WARNINGS)
#
# Compute tool paths
#
GETOS := python $(NACL_SDK_ROOT)/tools/getos.py
OSHELPERS = python $(NACL_SDK_ROOT)/tools/oshelpers.py
OSNAME := $(shell $(GETOS))
RM := $(OSHELPERS) rm
PNACL_TC_PATH := $(abspath $(NACL_SDK_ROOT)/toolchain/$(OSNAME)_pnacl)
PNACL_CXX := $(PNACL_TC_PATH)/bin/pnacl-clang++
PNACL_FINALIZE := $(PNACL_TC_PATH)/bin/pnacl-finalize
CXXFLAGS := -I$(NACL_SDK_ROOT)/include -I$(NACL_SDK_ROOT)/include/pnacl
LDFLAGS := -L$(NACL_SDK_ROOT)/lib/pnacl/Release -lppapi_cpp -lppapi -lnacl_io
#
# Disable DOS PATH warning when using Cygwin based tools Windows
#
CYGWIN ?= nodosfilewarning
export CYGWIN
# Declare the ALL target first, to make the 'all' target the default build
all: file_test.pexe
clean:
$(RM) file_test.pexe file_test.bc
file_test.bc: file_test.cc
$(PNACL_CXX) -o $@ $< -O2 $(CXXFLAGS) $(LDFLAGS)
file_test.pexe: file_test.bc
$(PNACL_FINALIZE) -o $@ $<
lt;
test.txtAAAA