ShellExecute(Handle, 'open', PChar('c:\test\app.exe'), nil, nil, SW_SHOW);请问这里地两个nil是什么意思?
这个命令是等到外部程序执行完之后,我地delphi主程序才继续执行么?
这个命令是等到外部程序执行完之后,我地delphi主程序才继续执行么?
解决方案 »
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前一个是传入app.exe的参数,后一个是搜索app.exe的路径。这个命令是等到外部程序执行完之后,我地delphi主程序才继续执行么?
不是。
用
function TExecForm.Exec(FileName: string; Visibility: integer): integer;
var
zAppName: array [0..512] of Char;
zCurDir: array [0..255] of Char;
WorkDir: string;
StartupInfo: TStartupInfo;
ProcessInfo: TProcessInformation;
ExitCode: Cardinal;
begin
StrPCopy(zAppName, FileName);
GetDir(0, WorkDir);
StrPCopy(zCurDir, WorkDir);
FillChar(StartupInfo, SizeOf(StartupInfo), #0);
StartupInfo.cb := SizeOf(StartupInfo);
StartupInfo.wShowWindow := Visibility;
if not CreateProcess(nil, zAppName, nil, nil, false, Create_New_Console or Normal_priority_class,
nil, nil, StartupInfo, ProcessInfo) then Result:=-1
else begin
WaitForSingleObject(ProcessInfo.hProcess, Infinite);
GetExitCodeProcess(ProcessInfo.hProcess, ExitCode);
Result := ExitCode;
end;
end;
?hwnd
Specifies a parent window. This window receives any message boxes that an application produces. For example, an application may report an error by producing a message box.?lpOperation
Pointer to a null-terminated string that specifies the operation to perform. The following operation strings are valid:
搊pen?
The function opens the file specified by lpFile. The file can be an executable file or a document file. The file can be a folder to open.
損rint?
The function prints the file specified by lpFile. The file should be a document file. If the file is an executable file, the function opens the file, as if 搊pen?had been specified.
揺xplore?
The function explores the folder specified by lpFile.The lpOperation parameter can be NULL. In that case, the function opens the file specified by lpFile.?lpFile
Pointer to a null-terminated string that specifies the file to open or print or the folder to open or explore. The function can open an executable file or a document file. The function can print a document file.?lpParameters
If lpFile specifies an executable file, lpParameters is a pointer to a null-terminated string that specifies parameters to be passed to the application.
If lpFile specifies a document file, lpParameters should be NULL.?lpDirectory
Pointer to a null-terminated string that specifies the default directory.?nShowCmd
If lpFile specifies an executable file, nShowCmd specifies how the application is to be shown when it is opened. This parameter can be one of the following values:
SW_HIDE
Hides the window and activates another window.
SW_MAXIMIZE
Maximizes the specified window.
SW_MINIMIZE
Minimizes the specified window and activates the next top-level window in the Z order.
SW_RESTORE
Activates and displays the window. If the window is minimized or maximized, Windows restores it to its original size and position. An application should specify this flag when restoring a minimized window.
SW_SHOW
Activates the window and displays it in its current size and position.
SW_SHOWDEFAULT
Sets the show state based on the SW_ flag specified in the STARTUPINFO structure passed to the CreateProcess function by the program that started the application. An application should call ShowWindow with this flag to set the initial show state of its main window.
SW_SHOWMAXIMIZED
Activates the window and displays it as a maximized window.
SW_SHOWMINIMIZED
Activates the window and displays it as a minimized window.
SW_SHOWMINNOACTIVE
Displays the window as a minimized window. The active window remains active.
SW_SHOWNA
Displays the window in its current state. The active window remains active.
SW_SHOWNOACTIVATE
Displays a window in its most recent size and position. The active window remains active.
SW_SHOWNORMAL
Activates and displays a window. If the window is minimized or maximized, Windows restores it to its original size and position. An application should specify this flag when displaying the window for the first time.If lpFile specifies a document file, nShowCmd should be zero.