conan+cmake 使用libpng库开发

港控/mmm° 2022-09-01 00:59 223阅读 0赞

## 构建环境 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NleHlsdW5h_size_16_color_FFFFFF_t_70]

*  随时可以在底部看到  
    ![在这里插入图片描述][970c34dd2f3042a08722e0df9e014952.png]

## conan的配置文件 ##

[requires]
    libpng/1.6.37@bincrafters/stable
    
    [generators]
    cmake
    
    [options]
    *:shared=True
    
    [imports]
    bin, *.dll -> ./bin
    lib, *.dylib* -> ./bin

## cmake 的配置文件 ##

cmake_minimum_required(VERSION 3.0.0)
    project(cdsConan VERSION 0.1.0)
    
    include(CTest)
    enable_testing()
    
    include(${ CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
    conan_basic_setup()
    
    add_executable(cdsConan main.cpp)
    
    set(CPACK_PROJECT_NAME ${ PROJECT_NAME})
    set(CPACK_PROJECT_VERSION ${ PROJECT_VERSION})
    include(CPack)

## 注意事项 ##

1.  下载动态库,并且将动态库导入文件中.

[options]
    *:shared=True
    
    [imports]
    bin, *.dll -> ./bin
    lib, *.dylib* -> ./bin

1.  cmake链接conan工程

include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
    conan_basic_setup()

1.  deubg
    
    1.  修改为debug模式
    2.  修改all为需要调试的文件

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NleHlsdW5h_size_16_color_FFFFFF_t_70 1]

## 测试代码 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NleHlsdW5h_size_16_color_FFFFFF_t_70 2]

#include <stddef.h>
    #include <stdlib.h>
    #include <string.h>
    #include <stdio.h>
    #include <png.h>
    #include <zlib.h>
    
    #include <string>
    
    using namespace std;
    
    int main(int argc, const char **argv)
    {
    
    
        png_image image; /* The control structure used by libpng */
    
        memset(&image, 0, (sizeof image));
        image.version = PNG_IMAGE_VERSION;
    
        printf("dsfsdfsfsfdsf============");
        printf("dsfsdfsfsfdsf============");
        printf("dsfsdfsfsfdsf============");
        char* name = "xxx.png";
        if (png_image_begin_read_from_file(&image, name) != 0) {
            png_bytep buffer;
             image.format = PNG_FORMAT_RGBA;
              buffer = (png_bytep)malloc(PNG_IMAGE_SIZE(image));
    
              if (buffer != NULL &&
                png_image_finish_read(&image, NULL/*background*/, buffer,
                    0/*row_stride*/, NULL/*colormap*/) != 0) {
                        if (png_image_write_to_file(&image, "./cds.png", 0/*convert_to_8bit*/,
                            buffer, 0/*row_stride*/, NULL/*colormap*/) != 0)
                        {
                        /* The image has been written successfully. */
                        printf("dsfsdfsfsfdsf============");
                        printf("dsfsdfsfsfdsf============");
                        printf("dsfsdfsfsfdsf============");
                        printf("dsfsdfsfsfdsf============");
                        exit(0);
                        }
                } else {
                    if (buffer == NULL)
                   png_image_free(&image);
                else
                   free(buffer);
                }
        }
    
        fprintf(stderr, "pngtopng: error: %s\n", image.message);
        system("pause");
        return 0;
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NleHlsdW5h_size_16_color_FFFFFF_t_70]: /images/20220829/d39ebe91ce4f4752bdd10f285fe94507.png
[970c34dd2f3042a08722e0df9e014952.png]: /images/20220829/0568eb64a39e42e1b751e9c9346aa4c9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NleHlsdW5h_size_16_color_FFFFFF_t_70 1]: /images/20220829/95916bbc8a4a4ff496d7e104f0e5c4c4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NleHlsdW5h_size_16_color_FFFFFF_t_70 2]: /images/20220829/e3a896a485194722b9b22d05ed268d7e.png