我正在用C语言编写一个在Cygwin上使用SDL2的程序。我遇到的问题是argc始终为1，即使命令行确实包含其他参数。
这有点难以复制，因为我无法发布此程序的所有代码，但我可以在此处包含主要来源以确保我的主要功能是正确的。
我的问题是，是否有任何已知的原因，为什么argc总是1并且不包括其他命令行参数（天气这是故意或使用SDL2的副作用等）？
这是我正在使用的代码：
#include <stdlib.h>
#include <stdio.h>
#include "config.h"
#include <string.h>
#ifdef SIGNAL_AVAIL
#include <signal.h>
#endif
#include "process.h"
#include "nvconsole.h"
#include "stringutils.h"
#include "nova.h"
struct NovaContext_s *context; // Nova system context
#ifdef SIGNAL_AVAIL
// #### Signal Handler ####
void sig_handler(int signo)
{
if (signo == SIGINT)
{
NVConsole_print(NVInfo,"Terminated by user");
NVConsole_println(NVInfo,"");
Nova_cleanUp(context);
exit(0);
}
}
#endif
void init()
{
#ifdef SIGNAL_AVAIL
if (signal(SIGINT, sig_handler) == SIG_ERR)
{
NVConsole_println(NVError,"[main] Can't catch SIGINT");
exit(1);
}
if (signal(SIGQUIT, sig_handler) == SIG_ERR)
{
NVConsole_println(NVError,"[main] Can't catch SIGQUIT");
exit(1);
}
#endif
}
int main(int argc, char* argv[]) {
for(int i=0;i<argc;i++) printf("%d %s\n",i,argv[i]);
init();
context = Nova_createContext();
Nova_init(context);
Nova_loop(context,0);
Nova_cleanUp(context);
return 0;
}
虽然此代码不直接使用SDL，但它正在链接并被包含代码的其他部分使用。我得到以下输出：
$ ./bin/nova
0 F:\dev\nova\bin\nova.exe
$ ./bin/nova hello
0 F:\dev\nova\bin\nova.exe
我在下面包含了makefile：
ARCH = $(shell uname)
CXX=gcc -std=c99
ifeq ($(ARCH), Darwin)
SDLFLAGS = `/usr/local/bin/sdl2-config --cflags`
SDLLIBS = `/usr/local/bin/sdl2-config --libs`
else
SDLFLAGS = `sdl2-config --cflags`
SDLLIBS = `sdl2-config --libs`
endif
#OPT= -O2 -s -D_GNU_SOURCE
OPT= -O2 -D_GNU_SOURCE
INCLUDE=-I. -I.. -Isrc/nova -Isrc/nvscript -Isrc/common -Isrc/headers -Isrc/modules -Isrc/search
#WARN=-Werror
CWD=$(shell pwd)
#CXXFLAGS= $(OPT) $(INCLUDE) $(SDLFLAGS) $(WARN) -fPIC
CXXFLAGS= $(OPT) $(INCLUDE) $(SDLFLAGS) $(WARN)
LIBS= -lm $(SDLLIBS) -ldl
LD=$(CXX) $(OPT)
#####################################################
LIBNVSCRIPT_API_VERSION = 1.0.0
#####################################################
COMP = nova \
nvdata \
nvconsole \
nvdatastore \
nvconfig \
nvevent \
rule_clock \
rule_nvs
COMP_H = nova.h \
nvdata.h \
nvconsole.h \
nvdatastore.h \
nvconfig.h \
nvevent.h \
rule_clock.h \
rule_nvs.h
COMP_HEADERS := $(addprefix src/nova/, $(COMP_H) )
COMP_OBJS := $(addprefix objs/, $(COMP:=.o) )
COMP_LIB := libs/libnova.a
#####################################################
NVSCRIPT = nvscript \
nvscriptcore \
nvscriptresult \
nvscriptlist \
nvscriptstring \
nvscriptfile \
nvscriptnet \
nvscriptprocess \
nvscriptdebug \
nvscriptexec \
nvscriptmath
NVSCRIPT_H = nvscript.h \
nvscriptcore.h \
nvscriptresult.h \
nvscriptlist.h \
nvscriptstring.h \
nvscriptfile.h \
nvscriptnet.h \
nvscriptprocess.h \
nvscriptdebug.h \
nvscriptexec.h \
nvscriptmath.h
NVSCRIPT_HEADERS := $(addprefix src/nvscript/, $(NVSCRIPT_H) )
NVSCRIPT_OBJS := $(addprefix objs/, $(NVSCRIPT:=.o) )
NVSCRIPT_LIB := libs/libnvscript-$(LIBNVSCRIPT_API_VERSION).a
#####################################################
COMMON = stringutils \
fileutils \
wildcard \
intarray \
floatarray \
chararray \
stringarray \
uchararray \
boolarray \
voidarray \
base64 \
sha1 \
scramble \
lfp \
x86_intmem \
x86_console \
x86_file \
x86_timer \
x86_net \
x86_process \
x86_rtc \
x86_keys \
sdl_video \
sdl_input
COMMON_H = stringutils.h \
fileutils.h \
mallocdebug.h \
wildcard.h \
intarray.h \
floatarray.h \
chararray.h \
stringarray.h \
uchararray.h \
boolarray.h \
base64.h \
voidarray.h \
sha1.h \
scramble.h \
lfp.h \
x86_intmem.h \
x86_console.h \
x86_file.h \
x86_timer.h \
x86_net.h \
x86_process.h \
x86_rtc.h \
x86_keys.h \
sdl_video.h \
sdl_input.h
COMMON_HEADERS := $(addprefix src/common/, $(COMMON_H) )
COMMON_OBJS := $(addprefix objs/, $(COMMON:=.o) )
COMMON_LIB := libs/libmlcommon.a
#####################################################
SEARCH = search searchitem
SEARCH_H = search.h searchitem.h
SEARCH_HEADERS := $(addprefix src/search/, $(SEARCH_H) )
SEARCH_OBJS := $(addprefix objs/search/, $(SEARCH:=.o) )
SEARCH_LIB := libs/libsearch.a
#####################################################
MODULES = ui statusbar welcome context netmsg
MODULES_H = ui.h statusbar.h welcome.h context.h netmsg.h
MODULES_HEADERS := $(addprefix src/modules/, $(MODULES_H) )
MODULES_OBJS := $(addprefix objs/modules/, $(MODULES:=.o) )
MODULES_DSOS := $(addprefix modules/, $(MODULES:=.so) )
#####################################################
OUTPUT = main
OUTPUT_OBJS := $(addprefix objs/, $(OUTPUT:=.o) )
OUTPUT_BINARY = bin/nova
NVSOUTPUT = nvs
NVSOUTPUT_OBJS := $(addprefix objs/, $(NVSOUTPUT:=.o) )
NVSOUTPUT_BINARY = bin/nvs
NVSTESTOUTPUT = nvstest
NVSTESTOUTPUT_OBJS := $(addprefix objs/, $(NVSTESTOUTPUT:=.o) )
NVSTESTOUTPUT_BINARY = bin/nvstest
SEARCHOUTPUT = search
SEARCHOUTPUT_OBJS := $(addprefix objs/, $(SEARCHOUTPUT:=.o) )
SEARCHOUTPUT_BINARY = bin/search
#####################################################
default: $(COMP_LIB) $(NVSCRIPT_LIB) $(COMMON_LIB) $(SEARCH_LIB) $(OUTPUT_BINARY) $(NVSOUTPUT_BINARY) $(NVSTESTOUTPUT_BINARY) $(SEARCHOUTPUT_BINARY)
modules: $(MODULES_OBJS) $(MODULES_DSOS)
nova: $(COMP_LIB) $(NVSCRIPT_LIB) $(COMMON_LIB) $(OUTPUT_BINARY)
nvs: $(NVSCRIPT_LIB) $(COMMON_LIB) $(NVSOUTPUT_BINARY) $(NVSTESTOUTPUT_BINARY)
#################### Components #####################
objs/%.o: src/nova/%.c $(COMP_HEADERS)
@echo "Compiling $<"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
$(COMP_LIB): $(COMP_OBJS)
@echo "Building the nova library ($(COMP_LIB))"
@ar rcs $(COMP_LIB) $(COMP_OBJS)
##################### NVScript ######################
objs/%.o: src/nvscript/%.c $(NVSCRIPT_HEADERS)
@echo "Compiling $<"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
$(NVSCRIPT_LIB): $(NVSCRIPT_OBJS)
@echo "Building the nvscript library ($(NVSCRIPT_LIB))"
@ar rcs $(NVSCRIPT_LIB) $(NVSCRIPT_OBJS)
#################### Common #####################
objs/%.o: src/common/%.c $(COMMON_HEADERS)
@echo "Compiling $<"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
$(COMMON_LIB): $(COMMON_OBJS)
@echo "Building the mlcommon library ($(COMMON_LIB))"
@ar rcs $(COMMON_LIB) $(COMMON_OBJS)
################## MODULES #####################
# Compile plugin and then link to shared library
objs/modules/%.o: src/modules/%.c $(MODULES_HEADERS)
@echo "Compiling module \"$*\""
@$(CXX) $(CXXFLAGS) -o $@ -c $<
modules/%.so: objs/modules/%.o $(MODULES_HEADERS)
@echo "Linking module \"$*\""
@$(CXX) -shared -o $@ $(COMP_OBJS) $(NVSCRIPT_OBJS) $(COMMON_OBJS) $(LIBS) $<
#################### Search #####################
objs/search/%.o: src/search/%.c $(SEARCH_HEADERS)
@echo "Compiling $<"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
$(SEARCH_LIB): $(SEARCH_OBJS)
@echo "Building the search library ($(SEARCH_LIB))"
@ar rcs $(SEARCH_LIB) $(SEARCH_OBJS)
###################### Output #######################
objs/main.o: src/main/nova.c $(COMP_HEADERS) $(NVSCRIPT_HEADERS) $(COMMON_HEADERS)
@echo "Building binary ($<)"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
objs/nvs.o: src/main/nvs.c $(NVSCRIPT_HEADERS) $(COMMON_HEADERS)
@echo "Building binary ($<)"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
objs/nvstest.o: src/main/nvstest.c $(NVSCRIPT_HEADERS) $(COMMON_HEADERS)
@echo "Building binary ($<)"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
objs/search.o: src/main/search.c $(SEARCH_HEADERS) $(COMMON_HEADERS)
@echo "Building binary ($<)"
@$(CXX) $(CXXFLAGS) -o $@ -c $<
$(OUTPUT_BINARY): $(OUTPUT_OBJS) $(COMP_LIB) $(NVSCRIPT_LIB) $(COMMON_LIB)
@echo "Linking $@"
@$(CXX) -o $@ $(OUTPUT_OBJS) $(COMP_OBJS) $(NVSCRIPT_OBJS) $(COMMON_OBJS) $(LIBS)
$(NVSOUTPUT_BINARY): $(NVSOUTPUT_OBJS) $(NVSCRIPT_LIB) $(COMMON_LIB)
@echo "Linking $@"
@$(CXX) -o $@ $(NVSOUTPUT_OBJS) $(NVSCRIPT_OBJS) $(COMMON_OBJS) $(LIBS)
$(NVSTESTOUTPUT_BINARY): $(NVSTESTOUTPUT_OBJS) $(NVSCRIPT_LIB) $(COMMON_LIB)
@echo "Linking $@"
@$(CXX) -o $@ $(NVSTESTOUTPUT_OBJS) $(NVSCRIPT_OBJS) $(COMMON_OBJS) $(LIBS)
$(SEARCHOUTPUT_BINARY): $(SEARCHOUTPUT_OBJS) $(SEARCH_LIB) $(COMMON_LIB)
@echo "Linking $@"
@$(CXX) -o $@ $(SEARCHOUTPUT_OBJS) $(SEARCH_OBJS) $(COMMON_OBJS) $(LIBS)
#####################################################
install:
./install.sh
uninstall:
./uninstall.sh
clean:
rm -f objs/*.o objs/modules/*.o objs/search/*.o */*.so */*.a modules/*.so libs/*.a $(OUTPUT_BINARY).exe $(OUTPUT_BINARY) $(NVSOUTPUT_BINARY).exe $(NVSOUTPUT_BINARY) $(NVSTESTOUTPUT_BINARY).exe $(NVSTESTOUTPUT_BINARY) $(SEARCHOUTPUT_BINARY) $(SEARCHOUTPUT_BINARY).exe
我还写了一个小测试：
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char* argv[]) {
for(int i=0;i<argc;i++) printf("%d %s\n",i,argv[i]);
}
毫无疑问，这确实有效并且显示所有参数，正如您所期望的那样。
$ ./test hello
0 ./test
1 hello
值得注意的是，argv [0]的路径似乎在两个示例中都有所不同，第一个（它不工作的地方）显示看起来像Windows路径，而第二个示例（确实有效）显示一个linux看路径。这表明什么吗？
答案 0 :(得分：1)
我认为这里需要argc（不是argv）
for(int i=0;i<argc;i++) printf("%d %s\n",i,argv[i]);