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Porting DLL import from c# to c++
Macro for dllexport/dllimport switchWhat is the difference between String and string in C#?Cast int to enum in C#What are the differences between a pointer variable and a reference variable in C++?How do I enumerate an enum in C#?What are the correct version numbers for C#?The Definitive C++ Book Guide and ListGet int value from enum in C#Metadata file '.dll' could not be foundWhat is the “-->” operator in C++?Why is reading lines from stdin much slower in C++ than Python?
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This is how I use/import the DLL using c#. How do I do it on c++ project?
[DllImport(@".x64something.dll", EntryPoint = "somthng", CharSet = CharSet.Unicode)]
static extern int somthng(string input);
c# c++ dll
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
add a comment |
This is how I use/import the DLL using c#. How do I do it on c++ project?
[DllImport(@".x64something.dll", EntryPoint = "somthng", CharSet = CharSet.Unicode)]
static extern int somthng(string input);
c# c++ dll
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
1
Are you targeting the Windows platform?
– J.R.
Mar 28 at 4:56
What are you trying to do? Targeting a C# dll in C++? Or just including a C++ library in C++?
– FranzHuber23
Mar 28 at 8:17
1
In nativec++you probably want to have a macro change from__declspec(dllexport)when building the dll to__declspec(dllimport)when using the dll. Here is a question that should help: stackoverflow.com/questions/14980649/…
– drescherjm
Mar 28 at 13:18
Yes @J.R.......
– TerribleDog
Mar 29 at 0:09
1
@FranzHuber23 Use an external DLL in c++ that was also used in c# project
– TerribleDog
Mar 29 at 0:09
add a comment |
This is how I use/import the DLL using c#. How do I do it on c++ project?
[DllImport(@".x64something.dll", EntryPoint = "somthng", CharSet = CharSet.Unicode)]
static extern int somthng(string input);
c# c++ dll
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
This is how I use/import the DLL using c#. How do I do it on c++ project?
[DllImport(@".x64something.dll", EntryPoint = "somthng", CharSet = CharSet.Unicode)]
static extern int somthng(string input);
c# c++ dll
c# c++ dll
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
edited Mar 28 at 2:48
TerribleDog
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
asked Mar 28 at 0:31
TerribleDogTerribleDog
5711 silver badge20 bronze badges
5711 silver badge20 bronze badges
1
Are you targeting the Windows platform?
– J.R.
Mar 28 at 4:56
What are you trying to do? Targeting a C# dll in C++? Or just including a C++ library in C++?
– FranzHuber23
Mar 28 at 8:17
1
In nativec++you probably want to have a macro change from__declspec(dllexport)when building the dll to__declspec(dllimport)when using the dll. Here is a question that should help: stackoverflow.com/questions/14980649/…
– drescherjm
Mar 28 at 13:18
Yes @J.R.......
– TerribleDog
Mar 29 at 0:09
1
@FranzHuber23 Use an external DLL in c++ that was also used in c# project
– TerribleDog
Mar 29 at 0:09
add a comment |
1
Are you targeting the Windows platform?
– J.R.
Mar 28 at 4:56
What are you trying to do? Targeting a C# dll in C++? Or just including a C++ library in C++?
– FranzHuber23
Mar 28 at 8:17
1
In nativec++you probably want to have a macro change from__declspec(dllexport)when building the dll to__declspec(dllimport)when using the dll. Here is a question that should help: stackoverflow.com/questions/14980649/…
– drescherjm
Mar 28 at 13:18
Yes @J.R.......
– TerribleDog
Mar 29 at 0:09
1
@FranzHuber23 Use an external DLL in c++ that was also used in c# project
– TerribleDog
Mar 29 at 0:09
1
1
Are you targeting the Windows platform?
– J.R.
Mar 28 at 4:56
Are you targeting the Windows platform?
– J.R.
Mar 28 at 4:56
What are you trying to do? Targeting a C# dll in C++? Or just including a C++ library in C++?
– FranzHuber23
Mar 28 at 8:17
What are you trying to do? Targeting a C# dll in C++? Or just including a C++ library in C++?
– FranzHuber23
Mar 28 at 8:17
1
1
In native
c++ you probably want to have a macro change from __declspec(dllexport) when building the dll to __declspec(dllimport) when using the dll. Here is a question that should help: stackoverflow.com/questions/14980649/…– drescherjm
Mar 28 at 13:18
In native
c++ you probably want to have a macro change from __declspec(dllexport) when building the dll to __declspec(dllimport) when using the dll. Here is a question that should help: stackoverflow.com/questions/14980649/…– drescherjm
Mar 28 at 13:18
Yes @J.R.......
– TerribleDog
Mar 29 at 0:09
Yes @J.R.......
– TerribleDog
Mar 29 at 0:09
1
1
@FranzHuber23 Use an external DLL in c++ that was also used in c# project
– TerribleDog
Mar 29 at 0:09
@FranzHuber23 Use an external DLL in c++ that was also used in c# project
– TerribleDog
Mar 29 at 0:09
add a comment |
1 Answer
1
active
oldest
votes
Provided that you do not have the development header and lib files available for the DLL and you need to dynamically load the DLL into your C++ project, then you can do the following.
Define a function pointer (equivalent to your extern declaration):
typedef int FnSomeFunction(const char* input);
Load the library (I'm using LoadLibraryA here to load an ansi-named DLL, this depends on your C++ project). The DLL must be in the search path, i.e. in the same path as the executable):
HMODULE hModule = LoadLibraryA("something.dll");
Check that the module is successfully loaded:
if (hModule == nullptr)
throw std::runtime_error("Lib not loaded");
Get the function entry point from the library:
FnSomething* fnSomething = (FnSomeFunction*)GetProcAddress(hModule, "somthng");
Call the function:
(*fnSomething)("some text");
Free the library when no longer needed:
FreeLibrary(hModule);
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
add a comment |
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1 Answer
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1 Answer
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oldest
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oldest
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oldest
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Provided that you do not have the development header and lib files available for the DLL and you need to dynamically load the DLL into your C++ project, then you can do the following.
Define a function pointer (equivalent to your extern declaration):
typedef int FnSomeFunction(const char* input);
Load the library (I'm using LoadLibraryA here to load an ansi-named DLL, this depends on your C++ project). The DLL must be in the search path, i.e. in the same path as the executable):
HMODULE hModule = LoadLibraryA("something.dll");
Check that the module is successfully loaded:
if (hModule == nullptr)
throw std::runtime_error("Lib not loaded");
Get the function entry point from the library:
FnSomething* fnSomething = (FnSomeFunction*)GetProcAddress(hModule, "somthng");
Call the function:
(*fnSomething)("some text");
Free the library when no longer needed:
FreeLibrary(hModule);
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
add a comment |
Provided that you do not have the development header and lib files available for the DLL and you need to dynamically load the DLL into your C++ project, then you can do the following.
Define a function pointer (equivalent to your extern declaration):
typedef int FnSomeFunction(const char* input);
Load the library (I'm using LoadLibraryA here to load an ansi-named DLL, this depends on your C++ project). The DLL must be in the search path, i.e. in the same path as the executable):
HMODULE hModule = LoadLibraryA("something.dll");
Check that the module is successfully loaded:
if (hModule == nullptr)
throw std::runtime_error("Lib not loaded");
Get the function entry point from the library:
FnSomething* fnSomething = (FnSomeFunction*)GetProcAddress(hModule, "somthng");
Call the function:
(*fnSomething)("some text");
Free the library when no longer needed:
FreeLibrary(hModule);
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
add a comment |
Provided that you do not have the development header and lib files available for the DLL and you need to dynamically load the DLL into your C++ project, then you can do the following.
Define a function pointer (equivalent to your extern declaration):
typedef int FnSomeFunction(const char* input);
Load the library (I'm using LoadLibraryA here to load an ansi-named DLL, this depends on your C++ project). The DLL must be in the search path, i.e. in the same path as the executable):
HMODULE hModule = LoadLibraryA("something.dll");
Check that the module is successfully loaded:
if (hModule == nullptr)
throw std::runtime_error("Lib not loaded");
Get the function entry point from the library:
FnSomething* fnSomething = (FnSomeFunction*)GetProcAddress(hModule, "somthng");
Call the function:
(*fnSomething)("some text");
Free the library when no longer needed:
FreeLibrary(hModule);
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
Provided that you do not have the development header and lib files available for the DLL and you need to dynamically load the DLL into your C++ project, then you can do the following.
Define a function pointer (equivalent to your extern declaration):
typedef int FnSomeFunction(const char* input);
Load the library (I'm using LoadLibraryA here to load an ansi-named DLL, this depends on your C++ project). The DLL must be in the search path, i.e. in the same path as the executable):
HMODULE hModule = LoadLibraryA("something.dll");
Check that the module is successfully loaded:
if (hModule == nullptr)
throw std::runtime_error("Lib not loaded");
Get the function entry point from the library:
FnSomething* fnSomething = (FnSomeFunction*)GetProcAddress(hModule, "somthng");
Call the function:
(*fnSomething)("some text");
Free the library when no longer needed:
FreeLibrary(hModule);
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
edited Mar 29 at 3:55
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
answered Mar 29 at 0:41
J.R.J.R.
1,2211 silver badge9 bronze badges
1,2211 silver badge9 bronze badges
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
add a comment |
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
Alternatively, just build your C++ project against the appropriate header (.h) and import library (.lib) so that you can just call the function directly. If you can link directly against the import library, it will be much more convenient if there are a lot of functions to import.
– jazzdelightsme
Mar 29 at 3:44
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
True; my assumption was that these were not available. I'll update the answer to reflect this.
– J.R.
Mar 29 at 3:53
add a comment |
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1
Are you targeting the Windows platform?
– J.R.
Mar 28 at 4:56
What are you trying to do? Targeting a C# dll in C++? Or just including a C++ library in C++?
– FranzHuber23
Mar 28 at 8:17
1
In native
c++you probably want to have a macro change from__declspec(dllexport)when building the dll to__declspec(dllimport)when using the dll. Here is a question that should help: stackoverflow.com/questions/14980649/…– drescherjm
Mar 28 at 13:18
Yes @J.R.......
– TerribleDog
Mar 29 at 0:09
1
@FranzHuber23 Use an external DLL in c++ that was also used in c# project
– TerribleDog
Mar 29 at 0:09