在VC++中用CreateFile打开一个已存在的文件，结果返回INVALID_HANDLE_VALUE，一番排查发现是路径参数问题，项目配置使用的是Unicode字符集，如果直接用CreateFile("D:\\test.zip", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL)，会提示"const char *"类型的实参与"LPCWSTR"类型的形参不兼容

HANDLE h = CreateFile((LPCWSTR)"D:\\test.zip", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

if (h == INVALID_HANDLE_VALUE)
{
	return NULL;
}

代码虽然能编译运行，文件也存在，但是返回INVALID_HANDLE_VALUE，跳转到定义发现用的CreateFileW，所以是LPCWSTR

HANDLE

WINAPI

CreateFileW(

    _In_ LPCWSTR lpFileName,

    _In_ DWORD dwDesiredAccess,

    _In_ DWORD dwShareMode,

    _In_opt_ LPSECURITY_ATTRIBUTES lpSecurityAttributes,

    _In_ DWORD dwCreationDisposition,

    _In_ DWORD dwFlagsAndAttributes,

    _In_opt_ HANDLE hTemplateFile

    );

#ifdef UNICODE

#define CreateFile  CreateFileW

改为

const char* path = "D:\\test.zip";
int size1 = MultiByteToWideChar(CP_ACP, 0, path, -1, NULL, 0);
TCHAR* wpath = new TCHAR[size1];
MultiByteToWideChar(CP_ACP, 0, path, -1, wpath, size1);

HANDLE h = CreateFile(wpath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

if (h == INVALID_HANDLE_VALUE)
{
	return NULL;
}

就不会返回INVALID_HANDLE_VALUE，

也可以用

CreateFile(L"D:\\test.zip", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL)