文章目录
一、报错信息
二、解决方案
一、报错信息
在 Visual Studio 2019 中编译 Android NDK , 构建方式参考 【Android 逆向】Android 进程注入工具开发 ( Visual Studio 开发 Android NDK 应用 | 使用 Makefile 构建 Android 平台 NDK 应用 ) 博客 ;
报错信息如下 :
命令行报错信息 :
已启动生成… 1>------ 已启动生成: 项目: magic, 配置: Debug Win32 ------ 1>[x86] Install : libbridge.so => ../Debug/x86/libbridge.so 1>[x86] Install : cmd => ../Debug/x86/cmd 1>[x86] Compile++ : native <= native.cpp 1>./native/native.cpp(428,14): warning G0C39A92D: 'SearchCode' has C-linkage specified, but returns user-defined type 'std::string' (aka 'basic_string<char>') which is incompatible with C [-Wreturn-type-c-linkage] 1> std::string SearchCode(unsigned char* data,unsigned size){ 1> ^ 1>./native/native.cpp(442,15): error GEF7559A7: no matching function for call to 'search_string' 1> strOut += search_string(pModuleName, ver[i].address(), ver[i].realSize() + ver[i].address(), 1> ^~~~~~~~~~~~~ 1>./native/native.cpp:40:13: note: candidate function not viable: no known conversion from 'unsigned char *' to 'const char *' for 4th argument 1>std::string search_string(const char* module, unsigned begin, unsigned end, const char* data, size_t size) { 1> ^ 1>1 warning and 1 error generated. 1>make: *** [obj/local/x86/objs/native/native/native.o] Error 1 1>D:\001_Develop\017_Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(46,5): error MSB3073: 命令“"D:\001_Develop\001_SDK\Sdk\ndk\android-ndk-r14b\build\ndk-build.cmd" NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk NDK_APPLICATION_MK=Application.mk ”已退出，代码为 2。 1>已完成生成项目“magic.vcxproj”的操作 - 失败。 ========== 生成: 成功 0 个，失败 1 个，最新 0 个，跳过 0 个 ==========
Visual Studio 中的报错信息 :
二、解决方案
search_string 函数定义如下 :
std::string search_string(const char* module, unsigned begin, unsigned end, const char* data, size_t size) { ... }
上述函数第 4 44 个参数是 const char* data , 类型是 const char* ;
函数调用时 , 在 const char* data 参数位置 , 传入了 unsigned char* 类型的数据 ;
std::string SearchCode(unsigned char* data,unsigned size){ std::string strOut; strOut += search_string(pModuleName, ver[i].address(), ver[i].realSize() + ver[i].address(), data, size); return strOut; }
使用 reinterpret_cast<type-id> (expression) 进行强转 , 将 unsigned char* 类型的数据 强制转换为 const char* 类型 ;
修改后 :
std::string SearchCode(unsigned char* data,unsigned size){ std::string strOut; strOut += search_string(pModuleName, ver[i].address(), ver[i].realSize() + ver[i].address(), reinterpret_cast<const char*>(data), size); return strOut; }
重新编译项目 :
已启动生成… 1>------ 已启动生成: 项目: magic, 配置: Debug Win32 ------ 1>[x86] Install : libbridge.so => ../Debug/x86/libbridge.so 1>[x86] Install : cmd => ../Debug/x86/cmd 1>[x86] Compile++ : native <= native.cpp 1>./native/native.cpp(428,14): warning G0C39A92D: 'SearchCode' has C-linkage specified, but returns user-defined type 'std::string' (aka 'basic_string<char>') which is incompatible with C [-Wreturn-type-c-linkage] 1> std::string SearchCode(unsigned char* data,unsigned size){ 1> ^ 1>1 warning generated. 1>[x86] SharedLibrary : libnative.so 1>[x86] Install : libnative.so => ../Debug/x86/libnative.so 1>[x86] Install : tool => ../Debug/x86/tool 1>已完成生成项目“magic.vcxproj”的操作。 ========== 生成: 成功 1 个，失败 0 个，最新 0 个，跳过 0 个 ==========