getprocaddress

How to call MessageBox with GetProcAddress function?

由 我的未来我决定 提交于 2021-02-04 05:59:27
问题 I want to call MessageBox() function in such way: 1). load needed library 2). get the function address 3). call it So, for such aim as I understand, I should define new type with all types of arguments in MessageBox function. It returnes INT and accepts: HWND, LPCSTR, LPCSTR, UNIT. So I registred new type: typedef int(__stdcall *msgbox)(HWND, LPCSTR, LPCSTR, UINT); I have problems with calling such function. Does such way work for all functions or only for exported? How can I call MessageBox

How to call MessageBox with GetProcAddress function?

由 时光怂恿深爱的人放手 提交于 2021-02-04 05:59:04
问题 I want to call MessageBox() function in such way: 1). load needed library 2). get the function address 3). call it So, for such aim as I understand, I should define new type with all types of arguments in MessageBox function. It returnes INT and accepts: HWND, LPCSTR, LPCSTR, UNIT. So I registred new type: typedef int(__stdcall *msgbox)(HWND, LPCSTR, LPCSTR, UINT); I have problems with calling such function. Does such way work for all functions or only for exported? How can I call MessageBox

Calling GetProcAddress from VBA always returns null

由 孤街浪徒 提交于 2021-01-29 03:50:51
问题 I have 64 bit windows 10 with MS Office 64 bit. I am trying to get the VBA for Powerpoint to load and execute a function in a self-written 64 bit windows DLL. To prevent export name mangling I have used extern C: extern "C" { __declspec(dllexport) long jaadd(long a, long b) { return a + b; } } This simple function can be called by a C++ module with no problems: hinstDLL = LoadLibrary(L"D:\\Visual Studio 2017\\Projects\\PopUpDLL\\x64\\Debug\\PopUpDLL.dll"); if (hinstDLL != NULL) { jaadd =

Calling GetProcAddress from VBA always returns null

由 生来就可爱ヽ(ⅴ＜●) 提交于 2021-01-29 03:49:27
问题 I have 64 bit windows 10 with MS Office 64 bit. I am trying to get the VBA for Powerpoint to load and execute a function in a self-written 64 bit windows DLL. To prevent export name mangling I have used extern C: extern "C" { __declspec(dllexport) long jaadd(long a, long b) { return a + b; } } This simple function can be called by a C++ module with no problems: hinstDLL = LoadLibrary(L"D:\\Visual Studio 2017\\Projects\\PopUpDLL\\x64\\Debug\\PopUpDLL.dll"); if (hinstDLL != NULL) { jaadd =

VC DLL总结

由 只谈情不闲聊 提交于 2020-03-08 03:42:51
一、DLL的导出方法 1、使用_declspec(dllexport) 方法 DLL里全是C++的类的话，你无法在DEF里指定导出的函数，只能用__declspec(dllexport)导出类。 extern "C" _declspec(dllexport) int sum(int a,int b);//本文所有的例子只有一个sum即加法函数。 在制作DLL导出函数时由于C++存在函数重载，因此__declspec(dllexport) function(int,int) 在DLL会被decorate，例如被decorate成为 function_int_int，而且不同的编译器decorate的方法不同，造成了在用GetProcAddress取得function地址时的不便，使用extern "C"时，上述的decorate不会发生，因为C没有函数重载，但如此一来被extern"C"修饰的函数，就不具备重载能力，可以说extern 和 extern "C"不是一回事。 在VC++中，如果生成DLL可以不使用.def文件。只需要在VC++的函数定义前要加__declspec(dllexport)修饰就可以了。但是使用__declspec(dllexport)和使用.def文件是有区别的。如果DLL是提供给VC++用户使用的，只需要把编译DLL时产生的.lib提供给用户

Not finding function using GetProcAddress() C++ VBexpress 13

由 邮差的信 提交于 2020-01-16 00:36:08
问题 Okay so I'm coming dangerously close to a repost here but my situation is a little bit different than the numerous other posters about this function. I am interfacing with a DLL that was written way back in the day and all I have is the file. I don't have a .lib file so I'm using the LoadLibrary and GetProcessAddress functions. I followed the tutorial on the MSDN website to get the basic structure. the DLL is located in the project folder. it compiles. at run time, I am getting a numerical

Function pointer to multiple argument C++11 std::function: Templating GetProcAddress

由 為{幸葍}努か 提交于 2020-01-15 05:03:27
问题 I am trying to return a function instance from a FARPROC address given by another function that calls GetProcAddress. Came up with an interesting issue. Here's the function: template<class FT> std::function<FT> to_function(FARPROC address) { return address; } Later on I would create a no input function without any issues: auto try1 = to_function<int()>(addr1); However when the function takes an input, the visual c++ 11 compiler explodes: auto try2 = to_function<int(int)>(addr2); It rightfully

GetProcAddress cannot find my functions

由 孤街浪徒 提交于 2019-12-29 07:46:07
问题 I made a DLL with a function named "render()" and I want to load it dynamically to my application, but GetProcAddress cannot find it. Here's the DLL .h: #ifdef D3D_API_EXPORTS #define D3D_API_API __declspec(dllexport) #else #define D3D_API_API __declspec(dllimport) #endif D3D_API_API void render(); And here's DLL .cpp: #include "stdafx.h" #include "D3D_API.h" #include <iostream> D3D_API_API void render() { std::cout << "method called." << std::endl; } Here's the application that tries to use

C# GetProcAddress Returns Zero

由 萝らか妹 提交于 2019-12-29 05:19:24
问题 For some reason, whenever my C# .NET 2.0 application makes a call to GetProcAddress it always returns zero. public class MyClass { internal static class UnsafeNativeMethods { [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] internal static extern IntPtr LoadLibrary(string lpFileName); [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] internal static extern bool SetDllDirectory(string lpPathName); [DllImport("kernel32.dll", CharSet = CharSet.Auto,

C# GetProcAddress Returns Zero

由 為{幸葍}努か 提交于 2019-12-29 05:19:05
问题 For some reason, whenever my C# .NET 2.0 application makes a call to GetProcAddress it always returns zero. public class MyClass { internal static class UnsafeNativeMethods { [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] internal static extern IntPtr LoadLibrary(string lpFileName); [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] internal static extern bool SetDllDirectory(string lpPathName); [DllImport("kernel32.dll", CharSet = CharSet.Auto,
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