无法将参数1从“char *”转换为“LPCWSTR” [英] cannot convert parameter 1 from 'char *' to 'LPCWSTR'
问题描述
正在载入BMP档案
AUX_RGBImageRec *LoadBMP(char *Filename) // Loads A Bitmap Image
{
FILE *File=NULL; // File Handle
if (!Filename) // Make Sure A Filename Was Given
{
return NULL; // If Not Return NULL
}
File=fopen(Filename,"r"); // Check To See If The File Exists
if (File) // Does The File Exist?
{
fclose(File); // Close The Handle
return auxDIBImageLoad(Filename); // Load The Bitmap And Return A Pointer
}
return NULL; // If Load Failed Return NULL
}
m现在得到错误
错误C2664:'auxDIBImageLoadW':无法将参数1从'char *'转换为'LPCWSTR'
error C2664: 'auxDIBImageLoadW' : cannot convert parameter 1 from 'char *' to 'LPCWSTR'
如何解决?
推荐答案
您正在使用字符集设置为UNICODE(项目设置 - >配置选项 - >常规)来编译应用程序。 Windows头文件使用#defines将函数名称映射到nameA(对于多字节字符串)或nameW(对于unicode字符串)。
You're compiling your application with Character-Set set to UNICODE (Project Settings -> Configuration Options -> General). Windows header files use #defines to "map" function names to either nameA (for multi-byte strings) or nameW (for unicode strings).
这意味着头文件中会有一个#define就像这样
That means somewhere in a header file there will be a #define like this
#define auxDIBImageLoad auxDIBImageLoadW
所以你实际上不是调用 auxDIBImageLoad
(没有那个名字的函数)重新调用 auxDIBImageLoadW
。 auxDIBImageLoadW
需要一个unicode字符串( wchar_t const *
)。您正在传递多字节字符串( char const *
)。
So you're not actually calling auxDIBImageLoad
(there is no function with that name), you're calling auxDIBImageLoadW
. And auxDIBImageLoadW
expects a unicode string (wchar_t const*
). You're passing a multi-byte string (char const*
).
您可以执行以下操作之一
You can do one of the following
- 将项目更改为使用多字节字符集( - >项目设置)
- 通过将
auxDIBImageLoad
替换为auxDIBImageLoadA
- 将字符串转换为unicode
LoadBMP
来调用函数的多字节版本>更改
LoadBMP
函数接受unicode字符串本身 - change your project to use multi-byte character set (-> project settings)
- explicitly call the multi-byte version of the function by replacing
auxDIBImageLoad
withauxDIBImageLoadA
- change your
LoadBMP
function to accept a unicode string itself - convert the string to unicode inside
LoadBMP
我建议您更改 LoadBMP
一个unicode字符串本身或直接调用 auxDIBImageLoadA
(按顺序)。
如果不破坏很多其他代码,更改项目设置可能是OK。
我会不建议转换字符串,虽然,因为它是不必要的。直接调用 auxDIBImageLoadA
更容易,结果是一样的。
I'd recommend either changing LoadBMP
to accept a unicode string itself or calling auxDIBImageLoadA
directly (in that order).
Changing the project settings might be OK if it doesn't break a lot of other code.
I would not suggest converting the string though, since it's unnecessary. Calling auxDIBImageLoadA
directly is far easier, and the result is the same.
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