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Connect two third party modules with “const char*” and “char*” arguments
How to convert a std::string to const char* or char*?Convert const char* type to int arrayWhat is the difference between using Str.c_str() directly and use it to initialize a const char *?static_cast from 'const unsigned char *const *' to 'const char *const *' is not allowedVC++ cannot convert argument from 'CString' to 'const char *'Correct use of PlaySound function in C++Efficient way to pass expressions of local variables to third party library (Ipopt)Cannot initialize const int from unpacked tupleWriting to an Output FileFunction receiving a const struct and cin commend
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I have two third party modules and I have to combine them.
First I get data from a class. I will submit this data to a function.
bool loadLibrary(const char *strPlugName)
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
return false;
The const char * strPlugName is a value that I got from another library. I cannot change this value type myself.
Inside the function I try to call a BASS Library function.
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
Definition: typedef HPLUGIN (*BASS_PluginLoad_Type)(char *file,DWORD flags);
Here Xcode tell me:
Cannot initialize a parameter of type 'char *' with an rvalue of type 'const char *'
My question is how I can convert or cast this const char * to char *?
c++
edited 2 days ago
StoryTeller
104k13219282
asked 2 days ago
Thomas DThomas D
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have two third party modules and I have to combine them.
First I get data from a class. I will submit this data to a function.
bool loadLibrary(const char *strPlugName)
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
return false;
The const char * strPlugName is a value that I got from another library. I cannot change this value type myself.
Inside the function I try to call a BASS Library function.
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
Definition: typedef HPLUGIN (*BASS_PluginLoad_Type)(char *file,DWORD flags);
Here Xcode tell me:
Cannot initialize a parameter of type 'char *' with an rvalue of type 'const char *'
My question is how I can convert or cast this const char * to char *?
c++
edited 2 days ago
StoryTeller
104k13219282
asked 2 days ago
Thomas DThomas D
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Not to get crucified, but const_cast ... ouch...
– user1810087
2 days ago
add a comment |
I have two third party modules and I have to combine them.
First I get data from a class. I will submit this data to a function.
bool loadLibrary(const char *strPlugName)
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
return false;
The const char * strPlugName is a value that I got from another library. I cannot change this value type myself.
Inside the function I try to call a BASS Library function.
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
Definition: typedef HPLUGIN (*BASS_PluginLoad_Type)(char *file,DWORD flags);
Here Xcode tell me:
Cannot initialize a parameter of type 'char *' with an rvalue of type 'const char *'
My question is how I can convert or cast this const char * to char *?
c++
edited 2 days ago
StoryTeller
104k13219282
asked 2 days ago
Thomas DThomas D
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have two third party modules and I have to combine them.
First I get data from a class. I will submit this data to a function.
bool loadLibrary(const char *strPlugName)
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
return false;
The const char * strPlugName is a value that I got from another library. I cannot change this value type myself.
Inside the function I try to call a BASS Library function.
HPLUGIN temp = _BASS_PluginLoad(strPlugName,0);
Definition: typedef HPLUGIN (*BASS_PluginLoad_Type)(char *file,DWORD flags);
Here Xcode tell me:
Cannot initialize a parameter of type 'char *' with an rvalue of type 'const char *'
My question is how I can convert or cast this const char * to char *?
c++
c++
edited 2 days ago
StoryTeller
104k13219282
asked 2 days ago
Thomas DThomas D
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 days ago
StoryTeller
104k13219282
asked 2 days ago
Thomas DThomas D
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 2 days ago
StoryTeller
104k13219282
edited 2 days ago
StoryTeller
104k13219282
edited 2 days ago
StoryTeller
104k13219282
104k13219282
asked 2 days ago
Thomas DThomas D
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Thomas DThomas D
445
asked 2 days ago
Thomas DThomas D
445
445
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Thomas D is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Not to get crucified, but const_cast ... ouch...
– user1810087
2 days ago
add a comment |
Not to get crucified, but const_cast ... ouch...
– user1810087
2 days ago
Not to get crucified, but const_cast ... ouch...
– user1810087
2 days ago
Not to get crucified, but const_cast ... ouch...
– user1810087
2 days ago
add a comment |
2 Answers
2
active
oldest
votes
If and only if the function called via _BASS_PluginLoad doesn't alter the memory pointed at by file, you can use a const_cast:
HPLUGIN temp = _BASS_PluginLoad(const_cast<char*>(strPlugName),0);
Some old c API's are not const correct on account of the const keyword being a fairly late addition to the C language. But they still don't mutate their arguments, so a const_cast is the easiest way to make use of them in const correct C++ wrappers. It's a perfectly legitimate reason (maybe even the reason) for that cast.
answered 2 days ago
StoryTellerStoryTeller
104k13219282
1
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
add a comment |
The easy and safe way is to copy the argument into a local buffer, and then pass a pointer to that. As you are using C++, you can automate the memory management.
bool loadLibrary(const char *strPlugName)
std::string local(strPlugName);
local.push_back(''); // Ensure null terminated, if not using C++11 or greater
HPLUGIN temp = _BASS_PluginLoad(&local[0],0);
return false;
If using C++17, you can just call local.data() instead of &local[0].
Language lawyer caveat:
Strictly speaking, &local[0] was not defined to work in C++98 - in practice it always did (and later versions of the standard defined it to work).
edited 2 days ago
Toby Speight
17.4k134368
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correctlocal.data()however.
– StoryTeller
2 days ago
@StoryTellerlocal.data()is null-terminated in C++11, but I'm not sure&local[0]is - BICBW.
– Martin Bonner
2 days ago
They both produce the same buffer (as doesc_str) since C++11. The null terminator is guaranteed.
– StoryTeller
2 days ago
add a comment |
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2 Answers
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2 Answers
2
active
oldest
votes
active
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votes
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oldest
votes
If and only if the function called via _BASS_PluginLoad doesn't alter the memory pointed at by file, you can use a const_cast:
HPLUGIN temp = _BASS_PluginLoad(const_cast<char*>(strPlugName),0);
Some old c API's are not const correct on account of the const keyword being a fairly late addition to the C language. But they still don't mutate their arguments, so a const_cast is the easiest way to make use of them in const correct C++ wrappers. It's a perfectly legitimate reason (maybe even the reason) for that cast.
answered 2 days ago
StoryTellerStoryTeller
104k13219282
1
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
add a comment |
If and only if the function called via _BASS_PluginLoad doesn't alter the memory pointed at by file, you can use a const_cast:
HPLUGIN temp = _BASS_PluginLoad(const_cast<char*>(strPlugName),0);
Some old c API's are not const correct on account of the const keyword being a fairly late addition to the C language. But they still don't mutate their arguments, so a const_cast is the easiest way to make use of them in const correct C++ wrappers. It's a perfectly legitimate reason (maybe even the reason) for that cast.
answered 2 days ago
StoryTellerStoryTeller
104k13219282
1
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
add a comment |
If and only if the function called via _BASS_PluginLoad doesn't alter the memory pointed at by file, you can use a const_cast:
HPLUGIN temp = _BASS_PluginLoad(const_cast<char*>(strPlugName),0);
Some old c API's are not const correct on account of the const keyword being a fairly late addition to the C language. But they still don't mutate their arguments, so a const_cast is the easiest way to make use of them in const correct C++ wrappers. It's a perfectly legitimate reason (maybe even the reason) for that cast.
answered 2 days ago
StoryTellerStoryTeller
104k13219282
If and only if the function called via _BASS_PluginLoad doesn't alter the memory pointed at by file, you can use a const_cast:
HPLUGIN temp = _BASS_PluginLoad(const_cast<char*>(strPlugName),0);
Some old c API's are not const correct on account of the const keyword being a fairly late addition to the C language. But they still don't mutate their arguments, so a const_cast is the easiest way to make use of them in const correct C++ wrappers. It's a perfectly legitimate reason (maybe even the reason) for that cast.
answered 2 days ago
StoryTellerStoryTeller
104k13219282
edited 2 days ago
answered 2 days ago
StoryTellerStoryTeller
104k13219282
answered 2 days ago
StoryTellerStoryTeller
104k13219282
answered 2 days ago
StoryTellerStoryTeller
104k13219282
104k13219282
1
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
add a comment |
1
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
1
1
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
Note that only some APIs can be fixed like this. Others actually do temporarily mutate their argument. (There's a notorious Win32 API which does this, but I can't remember which it is.)
– Martin Bonner
2 days ago
add a comment |
The easy and safe way is to copy the argument into a local buffer, and then pass a pointer to that. As you are using C++, you can automate the memory management.
bool loadLibrary(const char *strPlugName)
std::string local(strPlugName);
local.push_back(''); // Ensure null terminated, if not using C++11 or greater
HPLUGIN temp = _BASS_PluginLoad(&local[0],0);
return false;
If using C++17, you can just call local.data() instead of &local[0].
Language lawyer caveat:
Strictly speaking, &local[0] was not defined to work in C++98 - in practice it always did (and later versions of the standard defined it to work).
edited 2 days ago
Toby Speight
17.4k134368
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correctlocal.data()however.
– StoryTeller
2 days ago
@StoryTellerlocal.data()is null-terminated in C++11, but I'm not sure&local[0]is - BICBW.
– Martin Bonner
2 days ago
They both produce the same buffer (as doesc_str) since C++11. The null terminator is guaranteed.
– StoryTeller
2 days ago
add a comment |
The easy and safe way is to copy the argument into a local buffer, and then pass a pointer to that. As you are using C++, you can automate the memory management.
bool loadLibrary(const char *strPlugName)
std::string local(strPlugName);
local.push_back(''); // Ensure null terminated, if not using C++11 or greater
HPLUGIN temp = _BASS_PluginLoad(&local[0],0);
return false;
If using C++17, you can just call local.data() instead of &local[0].
Language lawyer caveat:
Strictly speaking, &local[0] was not defined to work in C++98 - in practice it always did (and later versions of the standard defined it to work).
edited 2 days ago
Toby Speight
17.4k134368
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correctlocal.data()however.
– StoryTeller
2 days ago
@StoryTellerlocal.data()is null-terminated in C++11, but I'm not sure&local[0]is - BICBW.
– Martin Bonner
2 days ago
They both produce the same buffer (as doesc_str) since C++11. The null terminator is guaranteed.
– StoryTeller
2 days ago
add a comment |
The easy and safe way is to copy the argument into a local buffer, and then pass a pointer to that. As you are using C++, you can automate the memory management.
bool loadLibrary(const char *strPlugName)
std::string local(strPlugName);
local.push_back(''); // Ensure null terminated, if not using C++11 or greater
HPLUGIN temp = _BASS_PluginLoad(&local[0],0);
return false;
If using C++17, you can just call local.data() instead of &local[0].
Language lawyer caveat:
Strictly speaking, &local[0] was not defined to work in C++98 - in practice it always did (and later versions of the standard defined it to work).
edited 2 days ago
Toby Speight
17.4k134368
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
The easy and safe way is to copy the argument into a local buffer, and then pass a pointer to that. As you are using C++, you can automate the memory management.
bool loadLibrary(const char *strPlugName)
std::string local(strPlugName);
local.push_back(''); // Ensure null terminated, if not using C++11 or greater
HPLUGIN temp = _BASS_PluginLoad(&local[0],0);
return false;
If using C++17, you can just call local.data() instead of &local[0].
Language lawyer caveat:
Strictly speaking, &local[0] was not defined to work in C++98 - in practice it always did (and later versions of the standard defined it to work).
edited 2 days ago
Toby Speight
17.4k134368
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
edited 2 days ago
Toby Speight
17.4k134368
edited 2 days ago
Toby Speight
17.4k134368
edited 2 days ago
Toby Speight
17.4k134368
17.4k134368
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
answered 2 days ago
Martin BonnerMartin Bonner
23.8k33267
23.8k33267
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correctlocal.data()however.
– StoryTeller
2 days ago
@StoryTellerlocal.data()is null-terminated in C++11, but I'm not sure&local[0]is - BICBW.
– Martin Bonner
2 days ago
They both produce the same buffer (as doesc_str) since C++11. The null terminator is guaranteed.
– StoryTeller
2 days ago
add a comment |
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correctlocal.data()however.
– StoryTeller
2 days ago
@StoryTellerlocal.data()is null-terminated in C++11, but I'm not sure&local[0]is - BICBW.
– Martin Bonner
2 days ago
They both produce the same buffer (as doesc_str) since C++11. The null terminator is guaranteed.
– StoryTeller
2 days ago
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correct
local.data() however.– StoryTeller
2 days ago
You can skip the null termination since C++11 if memory serves. You do need C++17 for the const correct
local.data() however.– StoryTeller
2 days ago
@StoryTeller
local.data() is null-terminated in C++11, but I'm not sure &local[0] is - BICBW.– Martin Bonner
2 days ago
@StoryTeller
local.data() is null-terminated in C++11, but I'm not sure &local[0] is - BICBW.– Martin Bonner
2 days ago
They both produce the same buffer (as does
c_str) since C++11. The null terminator is guaranteed.– StoryTeller
2 days ago
They both produce the same buffer (as does
c_str) since C++11. The null terminator is guaranteed.– StoryTeller
2 days ago
add a comment |
Thomas D is a new contributor. Be nice, and check out our Code of Conduct.
Thomas D is a new contributor. Be nice, and check out our Code of Conduct.
Thomas D is a new contributor. Be nice, and check out our Code of Conduct.
Thomas D is a new contributor. Be nice, and check out our Code of Conduct.
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Not to get crucified, but const_cast ... ouch...
– user1810087
2 days ago