求解决！！！
问各位一个问题：加载动态库，为什么把XXX.dll复制到目录下可以执行，用LoadLibrary（）加载就会出错：找不到该XXX.dll
[解决办法]
说明你LoadLibrary中路径设置的不对，一般.dll建议放在system或者是应用程序路径，这样直接用相对路径就好。
[解决办法]
程序在查找动态库时，先在系统的环境变量中查找，如果找不到就会在当前的程序目录中查找；
所以要看环境变量有没有设对
[解决办法]
If the string does not specify a path, the function uses a standard search strategy to find the file. See the Remarks for more information.
Return Values
If the function succeeds, the return value is a handle to the module.
If the function fails, the return value is NULL. To get extended error information, call GetLastError.
Remarks
LoadLibrary can be used to map a DLL module and return a handle that can be used in GetProcAddress to get the address of a DLL function. LoadLibrary can also be used to map other executable modules. For example, the function can specify an .EXE file to get a handle that can be used inFindResource orLoadResource. Do not use LoadLibrary to "run" a .EXE file.
If the module is a DLL not already mapped for the calling process, the system calls the DLL's DllMain function with the DLL_PROCESS_ATTACH value. If the DLL's entry-point function does not return TRUE, LoadLibrary fails and returns NULL.
It is not safe to call LoadLibrary from DllMain. For more information, see the Remarks section in DllMain.
Module handles are not global or inheritable. A call to LoadLibrary by one process does not produce a handle that another process can use — for example, in calling GetProcAddress. The other process must make its own call to LoadLibrary for the module before calling GetProcAddress.
If no filename extension is specified in the lpLibFileName parameter, the default library extension .DLL is appended. However, the filename string can include a trailing point character (.) to indicate that the module name has no extension. When no path is specified, the function searches for loaded modules whose base name matches the base name of the module to be loaded. If the name matches, the load succeeds. Otherwise, the function searches for the file in the following sequence:
The directory from which the application loaded.
The current directory.
Windows 95 and Windows 98: The Windows system directory. Use theGetSystemDirectory function to get the path of this directory.
Windows NT: The 32-bit Windows system directory. Use the GetSystemDirectory function to get the path of this directory. The name of this directory is SYSTEM32.
Windows NT: The 16-bit Windows system directory. There is no function that obtains the path of this directory, but it is searched. The name of this directory is SYSTEM.
The Windows directory. Use theGetWindowsDirectory function to get the path of this directory.
The directories that are listed in the PATH environment variable.
The first directory searched is the one directory containing the image file used to create the calling process (for more information, see the CreateProcess function). Doing this allows private dynamic-link library (DLL) files associated with a process to be found without adding the process's installed directory to the PATH environment variable.
The Visual C++ compiler supports a syntax that enables you to declare thread-local variables: _declspec(thread). If you use this syntax in a DLL, you will not be able to load the DLL explicitly using LoadLibrary or LoadLibraryEx. If your DLL will be loaded explicitly, you must use the thread local storage functions instead of _declspec(thread).
Windows 95: If you are using LoadLibrary to load a module that contains a resource whose numeric identifier is greater than 0x7FFF, LoadLibrary fails.
Windows CE: Two different modules cannot have the same filename, given that the extensions are different. These effectively have the same "module" name. For example, if LoadLibrary is made on "Sample.cpl", the operating system will not load Sample.cpl, but instead will again load Sample.dll. A similar limitation exists for modules with the same name but residing in different directories. For example, if LoadLibrary is called on "\\Windows\Sample.dll", and then LoadLibrary is called on "\\MyDir\Sample.dll", "\\Windows\Sample.dll" will simply be reloaded.
A search path to the executable module cannot be specified. Unless the full path to the module is given, Windows CE will search the following path for the module:
The root directory of the PC Card RAM expansion card, if one exists.
The windows directory (\Windows).
The root directory (\).
QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winbase.h.
Import Library: Use kernel32.lib.
Unicode: Implemented as Unicode and ANSI versions on Windows NT.
See Also
Dynamic-Link Libraries Overview, Dynamic-Link Library Functions, DllMain,FindResource, FreeLibrary, GetProcAddress,GetSystemDirectory,GetWindowsDirectory, LoadLibraryEx,LoadResource
