请举例说明api的用法

[knet]

详细的给分

[teatool]

MessageBox(Application->Handle,"这里是正文","这里是标题",MB_OK | MB_ICONERROR);

[xiaoshi0]

API是Windows系统自带的函数,存放于system32目录中,可以直接调用:
BOOL ShowWindow(
HWND hWnd, // handle of window
int nCmdShow // show state of window
);
但有些函数和C++Builder的函数重名,为了使程序区分,所以最好加上范围标志:
AnsiString SrcFileName, DestFileName;
::CopyFile(SrcFileName.c_str(), DestFileName.c_str());