C++ “char *”类型的参数与“LPWSTR”类型的参数不兼容
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/20611865/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Argument of type "char *" is incompatible with parameter of type "LPWSTR"
提问by OliverMller
This has probably been asked before but I can't seem to find the solution:
之前可能已经问过这个问题，但我似乎找不到解决方案：
std::string GetPath()
{
char buffer[MAX_PATH];
::GetSystemDirectory(buffer,MAX_PATH);
strcat(buffer,"\version.dll");
return std::string(buffer);
}
This returns an error stating:
这将返回一个错误说明：
argument of type "char *" is incompatible with parameter of type "LPWSTR"
So yeah. Anyone got an answer?
是的。有人有答案吗？
回答by paulm
You need to use the ansi version:
您需要使用 ansi 版本：
std::string GetPath()
{
char buffer[MAX_PATH] = {};
::GetSystemDirectoryA(buffer,_countof(buffer)); // notice the A
strcat(buffer,"\version.dll");
return std::string(buffer);
}
Or use unicode:
或者使用 unicode：
std::wstring GetPath()
{
wchar_t buffer[MAX_PATH] = {};
::GetSystemDirectoryW(buffer,_countof(buffer)); // notice the W, or drop the W to get it "by default"
wcscat(buffer,L"\version.dll");
return std::wstring(buffer);
}
Rather than call the A/W versions explicitly you can drop the A/W and configure the whole project to use ansi/unicode instead. All this will do is change some #defines to replace foo with fooA/W.
您可以删除 A/W 并将整个项目配置为使用 ansi/unicode，而不是显式调用 A/W 版本。所有这些都会改变一些#defines 以用 fooA/W 替换 foo。
Notice that you should use _countof() to avoid incorrect sizes depending on the buffers type too.
请注意，您也应该使用 _countof() 来避免根据缓冲区类型的错误大小。
回答by kunal
If you compile your code using MultiByte support it will compile correctly,but when you compile it using Unicode flag it will give an error because in Unicode support ::GetSystemDirectoryA becomes ::GetSystemDirectoryW use consider using TCHAR instead of char.TCHAR is defined such that it becomes char in Multibyte flag and wchar_t with Unicode flag
如果您使用 MultiByte 支持编译代码，它将正确编译，但是当您使用 Unicode 标志编译它时，它将给出错误，因为在 Unicode 支持中 ::GetSystemDirectoryA 变为 ::GetSystemDirectoryW 使用考虑使用 TCHAR 而不是 char。TCHAR 被定义为它在多字节标志和 wchar_t 与 Unicode 标志中变为 char
TCHAR buffer[MAX_PATH];
::GetSystemDirectory(buffer,MAX_PATH);
_tcscat(buffer,_T("\version.dll"));
You can use typedef for string /wstring so your code becomes independent
您可以将 typedef 用于字符串 /wstring 以便您的代码变得独立
#ifdef UNICODE
typedef wstring STRING;
#else
typedef string STRING;
#endif
STRING GetPath()
{
TCHAR buffer[MAX_PATH];
::GetSystemDirectory(buffer,MAX_PATH);
_tcscat(buffer,_T("\version.dll"));
return STRING(buffer);
}
