GetProcAddress（）失败 GetLastError() 127

来源：互联网发布：ios降级会清除数据吗编辑：程序博客网时间：2024/05/06 08:00

有错误127的代码如下:

#include<windows.h>#include<stdio.h>//#pragma comment(linker,"/export:add=dllA_old.add")HMODULE hModule=NULL; //模块句柄FARPROC proc; //函数入口指针typedef int (__cdecl *Add)(int a,int b);Add padd;BOOL APIENTRY DllMain( HANDLE hModule,                        DWORD  ul_reason_for_call,                        LPVOID lpReserved ){if(NULL==hModule){hModule=LoadLibrary("dllA_old.dll");}if(NULL==hModule){MessageBoxA(NULL,"获取dllA_old.dll失败","caption",0);return 0;}    return TRUE;}int add(int a,int b){padd=(Add)GetProcAddress(hModule,"add");  //这里获取函数地址失败 127if(NULL==padd){char msg[256];sprintf(msg,"获取add()失败:%d",GetLastError());MessageBoxA(NULL,msg,"caption",0);return 0;}return padd(a,b);}

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修改方法，就是在add函数中，进行加装dll操作，而不是在dll的入口处加载dll文件,代码如下:

#include<windows.h>#include<stdio.h>//#pragma comment(linker,"/export:add=dllA_old.add")HMODULE hModule=NULL; //模块句柄FARPROC proc; //函数入口指针typedef int (__cdecl *Add)(int a,int b);Add padd;BOOL APIENTRY DllMain( HANDLE hModule,                        DWORD  ul_reason_for_call,                        LPVOID lpReserved ){if(NULL==hModule){hModule=LoadLibrary("dllA_old.dll");}if(NULL==hModule){MessageBoxA(NULL,"获取dllA_old.dll失败","caption",0);return 0;}    return TRUE;}int add(int a,int b){hModule=LoadLibrary("dllA_old.dll");//在这里加载哈padd=(Add)GetProcAddress(hModule,"add");if(NULL==padd){char msg[256];sprintf(msg,"获取add()失败:%d",GetLastError());MessageBoxA(NULL,msg,"caption",0);return 0;}return padd(a,b);}

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您的十分满意是我追求的宗旨。

您的一点建议是我后续的动力。

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