Input file stream on Wii

Hello,
I'm trying to port a small text based game I wrote for Windows over to Wii Homebrew. Currently I'm trying to figure out how to read text files and print out lines from the text onto the screen. However I can't do it the same way I did it in Windows (with ifstream and getline()); I have read a tutorial from CodeMii, "Using the filesystem", but it isn't very clear in all areas. For example it doesn't specify what header files I need, what libraries I should include in the MakeFile, etc. Below is the source, and the error report that I get from devkitPro:

Source — the code isn't part of my actual game, it's just trying to read a text file and print its first line on-screen. Here's the downloadable source, or look below to see it:
main.cpp

#include 
#include string>  // all these begin with a "<", but I had to remove them in this post
#include iostream>
#include stdlib.h>
#include gccore.h>
#include wiiuse/wpad.h>
#include fat.h>

static void *xfb = NULL;
static GXRModeObj *rmode = NULL;

void InitWii();
void WaitForHome();

int main()
{

	InitWii(); // calls all the needed init functions
	
	// OPEN a text file and print the 1st line on the screen
	FILE* txt = NULL;
	if(!fatInitDefault()) printf("\nfatInitDefault() failed.");
	
	txt = fopen("info.txt", "r");
	if (txt == NULL) printf("\nFile open failed.");
	
	char line[50];
	fgets(line, sizeof line, txt);
	for (int i = 0; i < 50; i++) {
		std::cout << line;
	}
	
	fclose(txt);

	// wait for HOME on Wiimote
	WaitForHome();

	return 0;
}

MakeFile

#---------------------------------------------------------------------------------
# Clear the implicit built in rules
#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------
ifeq ($(strip $(DEVKITPPC)),)
$(error "Please set DEVKITPPC in your environment. export DEVKITPPC=devkitPPC")
endif

include $(DEVKITPPC)/wii_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# INCLUDES is a list of directories containing extra header files
#---------------------------------------------------------------------------------
TARGET		:=	$(notdir $(CURDIR))
BUILD		:=	build
SOURCES		:=	source
DATA		:=	data  
INCLUDES	:=

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------

CFLAGS	= -g -O2 -Wall $(MACHDEP) $(INCLUDE)
CXXFLAGS	=	$(CFLAGS)

LDFLAGS	=	-g $(MACHDEP) -Wl,-Map,$(notdir $@).map

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS	:=	-lwiiuse -lbte -logc -lm -lfat

#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS	:=

#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export OUTPUT	:=	$(CURDIR)/$(TARGET)

export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
					$(foreach dir,$(DATA),$(CURDIR)/$(dir))

export DEPSDIR	:=	$(CURDIR)/$(BUILD)

#---------------------------------------------------------------------------------
# automatically build a list of object files for our project
#---------------------------------------------------------------------------------
CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
sFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.S)))
BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
	export LD	:=	$(CC)
else
	export LD	:=	$(CXX)
endif

export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
					$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) \
					$(sFILES:.s=.o) $(SFILES:.S=.o)

#---------------------------------------------------------------------------------
# build a list of include paths
#---------------------------------------------------------------------------------
export INCLUDE	:=	$(foreach dir,$(INCLUDES), -iquote $(CURDIR)/$(dir)) \
					$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
					-I$(CURDIR)/$(BUILD) \
					-I$(LIBOGC_INC)

#---------------------------------------------------------------------------------
# build a list of library paths
#---------------------------------------------------------------------------------
export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib) \
					-L$(LIBOGC_LIB)

export OUTPUT	:=	$(CURDIR)/$(TARGET)
.PHONY: $(BUILD) clean

#---------------------------------------------------------------------------------
$(BUILD):
	@[ -d $@ ] || mkdir -p $@
	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile

#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) $(OUTPUT).elf $(OUTPUT).dol

#---------------------------------------------------------------------------------
run:
	wiiload $(TARGET).dol


#---------------------------------------------------------------------------------
else

DEPENDS	:=	$(OFILES:.o=.d)

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(OUTPUT).dol: $(OUTPUT).elf
$(OUTPUT).elf: $(OFILES)

#---------------------------------------------------------------------------------
# This rule links in binary data with the .jpg extension
#---------------------------------------------------------------------------------
%.jpg.o	:	%.jpg
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	$(bin2o)

-include $(DEPENDS)

#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

Error report

Quote
devkitPro
> "make"
main.cpp
linking ... text_reader.elf
c:/devkitPro/libogc/lib/wii\libfat.a(disc.o): In function `get_io_wiisd':
/Users/davem/projects/devkitpro/libnds-master/libfat/libogc/../source/disc.c:48: undefined reference to `__io_wiisd'
/Users/davem/projects/devkitpro/libnds-master/libfat/libogc/../source/disc.c:48: undefined reference to `__io_wiisd'
c:/devkitPro/libogc/lib/wii\libfat.a(disc.o): In function `get_io_usbstorage':
/Users/davem/projects/devkitpro/libnds-master/libfat/libogc/../source/disc.c:51: undefined reference to `__io_usbstorage'
/Users/davem/projects/devkitpro/libnds-master/libfat/libogc/../source/disc.c:51: undefined reference to `__io_usbstorage'
collect2: ld returned 1 exit status
make[1]: *** [/c/projects/wii/text_reader/text_reader.elf] Error 1
"make": *** [build] Error 2

> Process Exit Code: 2
> Time Taken: 00:01

So could you please tell me exactly what libraries I need to include in the MakeFile, what headers I should include, and possibly show me some code on how to print a line from the file? Thanks!



Edited 1 time(s). Last edit at 09/23/2009 03:33PM by diego_pmc.

In your Makefile change the order of lfat, try this:

LIBS	:=	-lfat -lwiiuse -lbte -logc -lm

Thanks, that fixed it. I have another question now:
I get this error:

Quote
devkitPro
> "make"
linking ... Risen.elf
c:/devkitpro/devkitppc/bin/../lib/gcc/powerpc-gekko/4.2.4/../../../../powerpc-gekko/lib\libc.a(lib_a-system.o): In function `_system_r':
(.text+0xbc): undefined reference to `_execve'
collect2: ld returned 1 exit status
make[1]: *** [/c/projects/wii/Risen/Risen.elf] Error 1
"make": *** [build] Error 2

> Process Exit Code: 2
> Time Taken: 00:01

I think it's because you are using a function called execve and the lib file is missing or the header file with the definition is absent.

The error looks exactly like the ones I mentioned previously, so I figured it might be because of some library I'm not including in the MakeFile. I certainly am not using any execve directly. Do you know what library I would need to include in the MakeFile for this?

I downloaded your code and I was able to compile it without any problem. Did you add new stuff? If yes, could you upload the new version.

Here it is:
> http://upload.worldofplayers.de/files4/Sx2J0TGunWRisen.rar

EDIT: The problems appears because of lines 47 and 57 in main.cpp:

47: plyr = ProcessSection(tb, plyr);
57: plyr = ProcessBattle(btl_data, plyr);

If I comment these lines out, devkitPro is able to create the *.elf and *.dol files without any problems.



Edited 4 time(s). Last edit at 09/23/2009 10:39PM by diego_pmc.

The thing the two functions have both in common is they are calling this line:

system("cls");

If that's commented, you can compile without problem...



Edited 1 time(s). Last edit at 09/23/2009 10:59PM by Crayon.

Check this post: => by frontier 21 Apr 2008 18:45 on [translate.google.com]

printf ("\x1b[2J");

This is the clear screen function for the terminal.

Yeah, but you should use something that is using termcap to make the application portable. Not to mention a lot easier to code. It's much easier to work with an api that takes care of these details for you.