# HG changeset patch
# User Giulio Moro <giuliomoro@yahoo.it>
# Date 1466442251 -3600
# Node ID 5a936f8e9447821993bfc6106a753ab02fdc3804
# Parent  85cf9c0da052aca449072f4158a44cc710c50dfd
I mean it actually works for real. Libpd checks for file and exits with meaningful error message if it does not find it.

diff -r 85cf9c0da052 -r 5a936f8e9447 Makefile
--- a/Makefile	Mon Jun 20 17:08:02 2016 +0100
+++ b/Makefile	Mon Jun 20 18:04:11 2016 +0100
@@ -210,9 +210,9 @@
 $(OUTPUT_FILE): $(CORE_ASM_OBJS) $(CORE_OBJS) $(PROJECT_OBJS) $(STATIC_LIBS) $(DEFAULT_MAIN_OBJS) $(DEFAULT_PD_OBJS)
 	$(eval DEFAULT_MAIN_CONDITIONAL :=\
 	    $(shell bash -c '[ `nm $(PROJECT_OBJS) 2>/dev/null | grep -w T | grep -w main | wc -l` == '0' ] && echo "$(DEFAULT_MAIN_OBJS)" || : '))
-	@#If there is a _main.pd file AND there is no "render" symbol then link in the $(DEFAULT_PD_OBJS) 
+	@#If there is a .pd file AND there is no "render" symbol then link in the $(DEFAULT_PD_OBJS) 
 	$(eval DEFAULT_PD_CONDITIONAL :=\
-	    $(shell bash -c '{ [ -f "$(PROJECT_DIR)/_main.pd" ] && [ `nm $(PROJECT_OBJS) 2>/dev/null | grep -w T | grep "render.*BelaContext" | wc -l` -eq 0 ]; } && echo '$(DEFAULT_PD_OBJS)' || : ' ))
+	    $(shell bash -c '{ ls $(PROJECT_DIR)/*.pd &>/dev/null && [ `nm $(PROJECT_OBJS) 2>/dev/null | grep -w T | grep "render.*BelaContext" | wc -l` -eq 0 ]; } && echo '$(DEFAULT_PD_OBJS)' || : ' ))
 	@echo 'Linking...'
 	$(CXX) $(SYNTAX_FLAG) -L/usr/xenomai/lib -L/usr/arm-linux-gnueabihf/lib -L/usr/arm-linux-gnueabihf/lib/xenomai -L/usr/lib/arm-linux-gnueabihf -pthread -Wpointer-arith -o "$(PROJECT_DIR)/$(PROJECT)" $(CORE_ASM_OBJS) $(CORE_OBJS) $(DEFAULT_MAIN_CONDITIONAL) $(DEFAULT_PD_CONDITIONAL) $(ASM_OBJS) $(C_OBJS) $(CPP_OBJS) $(STATIC_LIBS) $(LIBS)
 	@echo ' ...done'
diff -r 85cf9c0da052 -r 5a936f8e9447 core/default_libpd_render.cpp
--- a/core/default_libpd_render.cpp	Mon Jun 20 17:08:02 2016 +0100
+++ b/core/default_libpd_render.cpp	Mon Jun 20 18:04:11 2016 +0100
@@ -127,6 +127,16 @@
 
 bool setup(BelaContext *context, void *userData)
 {
+	// Check first of all if file exists. Will actually open it later.
+	char file[] = "_main.pd";
+	char folder[] = "./";
+	unsigned int strSize = strlen(file) + strlen(folder) + 1;
+	char* str = (char*)malloc(sizeof(char) * strSize);
+	snprintf(str, strSize, "%s%s", folder, file);
+	if(access(str, F_OK) == -1 ) {
+		printf("Error file %s/%s not found. The %s file should be your main patch.\n", folder, file, file);
+		return false;
+	}
 	dcm.setCallback(sendDigitalMessage);
 	analogChannelsInUse = min(context->analogChannels, gChannelsInUse - context->audioChannels - context->digitalChannels);
 	if(context->digitalChannels > 0){
@@ -189,10 +199,12 @@
 	libpd_bind("bela_digitalOut26");
 	libpd_bind("bela_setDigital");
 
-	char file[] = "_main.pd";
-	char folder[] = "./";
 	// open patch       [; pd open file folder(
-	libpd_openfile(file, folder);
+	void* patch = libpd_openfile(file, folder);
+	if(patch == NULL){
+		printf("Error: file %s/%s is corrupted.\n", folder, file); 
+		return false;
+	}
 	libpdReadFilesTask = Bela_createAuxiliaryTask(libpdReadFilesLoop, 60, "libpdReadFiles");
 	Bela_scheduleAuxiliaryTask(libpdReadFilesTask);