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建设银行电商网站,系统软件开发工程师,天津建站管理系统信息,aspcms网站无法打开在开发过程中#xff0c;经常会引用外部函数。方法主要有两种#xff1a; 方法一#xff1a;包含头文件并制定lib位置 优点#xff1a;使用简单缺点#xff1a;lib和vs版本有关#xff0c;不同的版本和编译模式可能导致编译失败 方法二#xff1a;GetProcAddress 优…在开发过程中经常会引用外部函数。方法主要有两种 方法一包含头文件并制定lib位置 优点使用简单缺点lib和vs版本有关不同的版本和编译模式可能导致编译失败 方法二GetProcAddress 优点和编译器无关只要获取函数地址即可使用缺点需要一个个的函数去获取地址相对麻烦 思考有没有好的导出方式可以直接包含头文件就使用呢 答案有参考Miniblink。在使用Miniblink的时候我们只需要包含头文件就可以直接引用导出函数。 源码分析 作为dll的开发者需要导出函数。模式如下 #if defined(__cplusplus) #define XYCENTER_EXTERN_C extern C #else #define XYCENTER_EXTERN_C #endif#这里定义宏根据函数参数个数不同定义如下函数一直延续到NXYCENTER_DEFINE_ITERATORN #define XYCENTER_DECLARE_ITERATOR0(returnVal, name, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name();#define XYCENTER_DECLARE_ITERATOR1(returnVal, name, p1, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1);#define XYCENTER_DECLARE_ITERATOR2(returnVal, name, p1, p2, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2);#格式按照【返回类型】【函数名】【参数】来维护导出函数列表0-N #define XYCENTER_FOR_EACH_DEFINE_FUNCTION(ITERATOR0, ITERATOR1ITERATOR2) \ITERATOR0(void, xyShutdown, ) \ITERATOR1(void, set_xycenterlog_handle,char *,) \#导出所有的函数0-N XYCENTER_FOR_EACH_DEFINE_FUNCTION(XYCENTER_DECLARE_ITERATOR0, XYCENTER_DECLARE_ITERATOR1)实现对应的导出函数即可 void xyShutdown(){} void set_xycenterlog_handle(char *){}作为dll的符号使用者分为两个步骤定义函数指针和对象获取对应的符号地址 #定义不同参数个数的函数指针以及对应的对象0-N #selectany 关键字相关含义可以自行搜索 #define XYCENTER_DEFINE_ITERATOR0(returnVal, name, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR1(returnVal, name, p1, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR2(returnVal, name, p1,p2, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#获取函数地址 #define XYCENTER_GET_PTR_ITERATOR(name) \name (xyFN_##name)GetProcAddress(hMod, #name); \if (!name) \MessageBoxA(((HWND)0), #name## api not found, #name, 0); #为了兼容上述维护的函数列表所以需要多对应获取0-N的参数模式这里直接使用变参模式 #define XYCENTER_GET_PTR_ITERATORN(returnVal, name,...) \XYCENTER_GET_PTR_ITERATOR(name);#最后一步设置dll路径并且初始化 #for each 不同参数的函数地址 XYCENTER_FOR_EACH_DEFINE_FUNCTION(XYCENTER_DEFINE_ITERATOR0, XYCENTER_DEFINE_ITERATOR1, XYCENTER_DEFINE_ITERATOR2)__declspec(selectany) const wchar_t* s_xyCenterDllPath LxyCenter.dll;inline void xyCenterSetWkeDllPath(const wchar_t* dllPath) {s_xyCenterDllPath dllPath; }inline int xyCenterInitialize() {HMODULE hMod NULL;if (!hMod)hMod LoadLibraryW(s_xyCenterDllPath);if (hMod) {XYCENTER_FOR_EACH_DEFINE_FUNCTION(XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN);return 1;}return 0; }完整头文件目前默认支持最多10个参数用户可以自己扩展 使用宏XYCENTER_EXPORTS来决定是导入函数还是导出函数 #ifndef XYCENTER_DEFINE_H #define XYCENTER_DEFINE_H#include windows.h// #define XYCENTER_CALL_TYPE __cdecl#if defined(__cplusplus) #define XYCENTER_EXTERN_C extern C #else #define XYCENTER_EXTERN_C #endifnamespace xyCenter { #pragma pack(pop)/定义函数指针以及变量/ #define XYCENTER_DEFINE_ITERATOR0(returnVal, name, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR1(returnVal, name, p1, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR2(returnVal, name, p1,p2, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR3(returnVal, name, p1,p2,p3, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR4(returnVal, name, p1,p2,p3,p4, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR5(returnVal, name, p1,p2,p3,p4,p5, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4,p5); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR6(returnVal, name, p1,p2,p3,p4,p5,p6, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4,p5,p6); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR7(returnVal, name, p1,p2,p3,p4,p5,p6,p7, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4,p5,p6,p7); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR8(returnVal, name, p1,p2,p3,p4,p5,p6,p7,p8, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4,p5,p6,p7,p8); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR9(returnVal, name, p1,p2,p3,p4,p5,p6,p7,p8,p9, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4,p5,p6,p7,p8,p9); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);#define XYCENTER_DEFINE_ITERATOR10(returnVal, name, p1,p2,p3,p4,p5,p6,p7,p8,p9,p10, description) \typedef returnVal(XYCENTER_CALL_TYPE* xyFN_##name)(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10); \__declspec(selectany) xyFN_##name name ((xyFN_##name)0);/获取dll函数指针地址/ #define XYCENTER_GET_PTR_ITERATOR(name) \name (xyFN_##name)GetProcAddress(hMod, #name); \if (!name) \MessageBoxA(((HWND)0), #name## api not found, #name, 0);#define XYCENTER_GET_PTR_ITERATORN(returnVal, name,...) \XYCENTER_GET_PTR_ITERATOR(name);/定义导出函数/ #define XYCENTER_DECLARE_ITERATOR0(returnVal, name, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name();#define XYCENTER_DECLARE_ITERATOR1(returnVal, name, p1, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1);#define XYCENTER_DECLARE_ITERATOR2(returnVal, name, p1, p2, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2);#define XYCENTER_DECLARE_ITERATOR3(returnVal, name, p1, p2,p3, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3);#define XYCENTER_DECLARE_ITERATOR4(returnVal, name, p1, p2,p3,p4, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4);#define XYCENTER_DECLARE_ITERATOR5(returnVal, name, p1, p2,p3,p4,p5, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4,p5);#define XYCENTER_DECLARE_ITERATOR6(returnVal, name, p1, p2,p3,p4,p5,p6, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4,p5,p6);#define XYCENTER_DECLARE_ITERATOR7(returnVal, name, p1, p2,p3,p4,p5,p6,p7, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4,p5,p6,p7);#define XYCENTER_DECLARE_ITERATOR8(returnVal, name, p1, p2,p3,p4,p5,p6,p7,p8, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4,p5,p6,p7,p8);#define XYCENTER_DECLARE_ITERATOR9(returnVal, name, p1, p2,p3,p4,p5,p6,p7,p8,p9, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4,p5,p6,p7,p8,p9);#define XYCENTER_DECLARE_ITERATOR10(returnVal, name, p1, p2,p3,p4,p5,p6,p7,p8,p9,p10, description) \XYCENTER_EXTERN_C __declspec(dllexport) returnVal name(p1, p2,p3,p4,p5,p6,p7,p8,p9,p10);// 以下是xyCenter的导出函数。格式按照【返回类型】【函数名】【参数】来排列 #define XYCENTER_FOR_EACH_DEFINE_FUNCTION(ITERATOR0, ITERATOR1,ITERATOR2,ITERATOR3,ITERATOR4,ITERATOR5,ITERATOR6,ITERATOR7,ITERATOR8,ITERATOR9,ITERATOR10) \ITERATOR0(int, get_msgno, 获取通知消息的消息code) \ITERATOR1(void, set_log_handle, PFN_XYCENTERLOG_HANDLE,设置日志句柄) \ITERATOR1(bool, write_data, XyCenterData *,写入用户共享数据) \ITERATOR1(bool, read_data, XyCenterData,获取用户数据) \ //导出函数 #ifdef XYCENTER_EXPORTSXYCENTER_FOR_EACH_DEFINE_FUNCTION(XYCENTER_DECLARE_ITERATOR0, XYCENTER_DECLARE_ITERATOR1, XYCENTER_DECLARE_ITERATOR2,\XYCENTER_DECLARE_ITERATOR3,XYCENTER_DECLARE_ITERATOR4, XYCENTER_DECLARE_ITERATOR5, XYCENTER_DECLARE_ITERATOR6,\XYCENTER_DECLARE_ITERATOR7, XYCENTER_DECLARE_ITERATOR8,XYCENTER_DECLARE_ITERATOR9, XYCENTER_DECLARE_ITERATOR10)//引入导出函数 #elseXYCENTER_FOR_EACH_DEFINE_FUNCTION(XYCENTER_DEFINE_ITERATOR0, XYCENTER_DEFINE_ITERATOR1, XYCENTER_DEFINE_ITERATOR2,\XYCENTER_DEFINE_ITERATOR3, XYCENTER_DEFINE_ITERATOR4, XYCENTER_DEFINE_ITERATOR5, XYCENTER_DEFINE_ITERATOR6,\XYCENTER_DEFINE_ITERATOR7, XYCENTER_DEFINE_ITERATOR8, XYCENTER_DEFINE_ITERATOR9, XYCENTER_DEFINE_ITERATOR10)__declspec(selectany) const wchar_t* s_xyCenterDllPath LxyCenter.dll;inline void SetWkeDllPath(const wchar_t* dllPath){s_xyCenterDllPath dllPath;}inline bool Initialize(){HMODULE hMod NULL;if (!hMod)hMod LoadLibraryW(s_xyCenterDllPath);if (hMod) {XYCENTER_FOR_EACH_DEFINE_FUNCTION(XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN,\XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN,\XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN, XYCENTER_GET_PTR_ITERATORN);return true;}return false;} #endif // DEBUG#endif // XYCENTER_DEFINE_H}; 此时我们只需要包含头文件并且初始化一下即可直接使用导出函数。