我正在学习OpenCV,但是我不能建立这个项目。
当我试图构建所有我得到这个错误:
22:49:54 **** Incremental Build of configuration Debug for project OpenCVLearning ****
make all
make: Nothing to be done for `all'.
22:49:55 Build Finished (took 135ms)
当我尝试运行时,收到以下消息:
terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_S_construct null not valid
下面是Make文件的内容:
################################################################################
# Automatically-generated file. Do not edit!
################################################################################
-include ../makefile.init
RM := rm -rf
# All of the sources participating in the build are defined here
-include sources.mk
-include src/subdir.mk
-include subdir.mk
-include objects.mk
ifneq ($(MAKECMDGOALS),clean)
ifneq ($(strip $(C++_DEPS)),)
-include $(C++_DEPS)
endif
ifneq ($(strip $(C_DEPS)),)
-include $(C_DEPS)
endif
ifneq ($(strip $(CC_DEPS)),)
-include $(CC_DEPS)
endif
ifneq ($(strip $(CPP_DEPS)),)
-include $(CPP_DEPS)
endif
ifneq ($(strip $(CXX_DEPS)),)
-include $(CXX_DEPS)
endif
ifneq ($(strip $(C_UPPER_DEPS)),)
-include $(C_UPPER_DEPS)
endif
endif
-include ../makefile.defs
# Add inputs and outputs from these tool invocations to the build variables
# All Target
all: OpenCVLearning
# Tool invocations
OpenCVLearning: $(OBJS) $(USER_OBJS)
@echo 'Building target: $@'
@echo 'Invoking: GCC C++ Linker'
g++ -L/usr/local/lib -o "OpenCVLearning" $(OBJS) $(USER_OBJS) $(LIBS)
@echo 'Finished building target: $@'
@echo ' '
# Other Targets
clean:
-$(RM) $(OBJS)$(C++_DEPS)$(C_DEPS)$(CC_DEPS)$(CPP_DEPS)$(EXECUTABLES)$(CXX_DEPS)$(C_UPPER_DEPS) OpenCVLearning
-@echo ' '
.PHONY: all clean dependents
.SECONDARY:
-include ../makefile.targets
源代码:
#include <cv.h>
#include <highgui.h>
using namespace cv;
int main( int argc, char** argv )
{
Mat image;
image = imread( argv[1], 1 );
if( argc != 2 || !image.data )
{
printf( "No image data \n" );
return -1;
}
namedWindow( "Display Image", CV_WINDOW_AUTOSIZE );
imshow( "Display Image", image );
waitKey(0);
return 0;
}
为什么会这样?我该怎么解决这个问题?
1条答案
按热度按时间jaxagkaj1#
这不是问题
make:对'all'没有什么可做的。
这只是意味着,一切都已经构建好了,您可以开始测试您的可执行文件了。
第二个
是执行阶段错误。
它说,在某处你或OpenCV传递一个
NULL
指针到一个std::string
构造函数,这是不允许的。代码中唯一可能发生这种情况的地方可能是
在这种情况下,
argc
为1,argv[1]
为NULL
。