004
01.04.2004, 11:05 Uhr
FloSoft
Medialer Over-Flow
(Administrator)
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ich denke er meinte _popen(...) Hab es selbst noch nie benutzt, schau am besten in die msdn
oder benutz folgendes Beispiel, wenn man Lesen und Schreiben will (z.b in den Input-Buffer):
| C++: |
#include <stdio.h>
#include <windows.h>
#define BUFSIZE 4096
HANDLE hChildStdinRd, hChildStdinWr, hChildStdinWrDup,
hChildStdoutRd, hChildStdoutWr, hChildStdoutRdDup,
hInputFile, hSaveStdin, hSaveStdout;
BOOL CreateChildProcess(VOID);
VOID WriteToPipe(VOID);
VOID ReadFromPipe(VOID);
VOID ErrorExit(LPTSTR);
VOID ErrMsg(LPTSTR, BOOL);
int main(int argc, char *argv[])
{
SECURITY_ATTRIBUTES saAttr;
BOOL fSuccess;
// Set the bInheritHandle flag so pipe handles are inherited.
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
// The steps for redirecting child process's STDOUT:
// 1. Save current STDOUT, to be restored later.
// 2. Create anonymous pipe to be STDOUT for child process.
// 3. Set STDOUT of the parent process to be write handle to
// the pipe, so it is inherited by the child process.
// 4. Create a noninheritable duplicate of the read handle and
// close the inheritable read handle.
// Save the handle to the current STDOUT.
hSaveStdout = GetStdHandle(STD_OUTPUT_HANDLE);
// Create a pipe for the child process's STDOUT.
if (! CreatePipe(&hChildStdoutRd, &hChildStdoutWr, &saAttr, 0))
ErrorExit("Stdout pipe creation failed\n");
// Set a write handle to the pipe to be STDOUT.
if (! SetStdHandle(STD_OUTPUT_HANDLE, hChildStdoutWr))
ErrorExit("Redirecting STDOUT failed");
// Create noninheritable read handle and close the inheritable read
// handle.
fSuccess = DuplicateHandle(GetCurrentProcess(), hChildStdoutRd,
GetCurrentProcess(), &hChildStdoutRdDup , 0,
FALSE,
DUPLICATE_SAME_ACCESS);
if( !fSuccess )
ErrorExit("DuplicateHandle failed");
CloseHandle(hChildStdoutRd);
// The steps for redirecting child process's STDIN:
// 1. Save current STDIN, to be restored later.
// 2. Create anonymous pipe to be STDIN for child process.
// 3. Set STDIN of the parent to be the read handle to the
// pipe, so it is inherited by the child process.
// 4. Create a noninheritable duplicate of the write handle,
// and close the inheritable write handle.
// Save the handle to the current STDIN.
hSaveStdin = GetStdHandle(STD_INPUT_HANDLE);
// Create a pipe for the child process's STDIN.
if (! CreatePipe(&hChildStdinRd, &hChildStdinWr, &saAttr, 0))
ErrorExit("Stdin pipe creation failed\n");
// Set a read handle to the pipe to be STDIN.
if (! SetStdHandle(STD_INPUT_HANDLE, hChildStdinRd))
ErrorExit("Redirecting Stdin failed");
// Duplicate the write handle to the pipe so it is not inherited.
fSuccess = DuplicateHandle(GetCurrentProcess(), hChildStdinWr,
GetCurrentProcess(), &hChildStdinWrDup, 0,
FALSE, // not inherited
DUPLICATE_SAME_ACCESS);
if (! fSuccess)
ErrorExit("DuplicateHandle failed");
CloseHandle(hChildStdinWr);
// Now create the child process.
fSuccess = CreateChildProcess();
if (! fSuccess)
ErrorExit("Create process failed");
// After process creation, restore the saved STDIN and STDOUT.
if (! SetStdHandle(STD_INPUT_HANDLE, hSaveStdin))
ErrorExit("Re-redirecting Stdin failed\n");
if (! SetStdHandle(STD_OUTPUT_HANDLE, hSaveStdout))
ErrorExit("Re-redirecting Stdout failed\n");
// Get a handle to the parent's input file.
if (argc > 1)
hInputFile = CreateFile(argv[1], GENERIC_READ, 0, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_READONLY, NULL);
else
hInputFile = hSaveStdin;
if (hInputFile == INVALID_HANDLE_VALUE)
ErrorExit("no input file\n");
// Write to pipe that is the standard input for a child process.
WriteToPipe();
// Read from pipe that is the standard output for child process.
ReadFromPipe();
return 0;
}
BOOL CreateChildProcess()
{
PROCESS_INFORMATION piProcInfo;
STARTUPINFO siStartInfo;
BOOL bFuncRetn = FALSE;
// Set up members of the PROCESS_INFORMATION structure.
ZeroMemory( &piProcInfo, sizeof(PROCESS_INFORMATION) );
// Set up members of the STARTUPINFO structure.
ZeroMemory( &siStartInfo, sizeof(STARTUPINFO) );
siStartInfo.cb = sizeof(STARTUPINFO);
// Create the child process.
bFuncRetn = CreateProcess(NULL,
"child", // command line
NULL, // process security attributes
NULL, // primary thread security attributes
TRUE, // handles are inherited
0, // creation flags
NULL, // use parent's environment
NULL, // use parent's current directory
&siStartInfo, // STARTUPINFO pointer
&piProcInfo); // receives PROCESS_INFORMATION
if (bFuncRetn == 0) {
ErrorExit("CreateProcess failed\n");
return 0;
} else {
CloseHandle(piProcInfo.hProcess);
CloseHandle(piProcInfo.hThread);
return bFuncRetn;
}
}
}
VOID WriteToPipe(VOID)
{
DWORD dwRead, dwWritten;
CHAR chBuf[BUFSIZE];
// Read from a file and write its contents to a pipe.
for (;;)
{
if (! ReadFile(hInputFile, chBuf, BUFSIZE, &dwRead, NULL) ||
dwRead == 0) break;
if (! WriteFile(hChildStdinWrDup, chBuf, dwRead,
&dwWritten, NULL)) break;
}
// Close the pipe handle so the child process stops reading.
if (! CloseHandle(hChildStdinWrDup))
ErrorExit("Close pipe failed\n");
}
VOID ReadFromPipe(VOID)
{
DWORD dwRead, dwWritten;
CHAR chBuf[BUFSIZE];
HANDLE hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
// Close the write end of the pipe before reading from the
// read end of the pipe.
if (!CloseHandle(hChildStdoutWr))
ErrorExit("Closing handle failed");
// Read output from the child process, and write to parent's STDOUT.
for (;;)
{
if( !ReadFile( hChildStdoutRdDup, chBuf, BUFSIZE, &dwRead,
NULL) || dwRead == 0) break;
if (! WriteFile(hSaveStdout, chBuf, dwRead, &dwWritten, NULL))
break;
}
}
VOID ErrorExit (LPTSTR lpszMessage)
{
fprintf(stderr, "%s\n", lpszMessage);
ExitProcess(0);
}
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| C++: |
// The code for the child process.
#include <windows.h>
#define BUFSIZE 4096
int main(VOID)
{
CHAR chBuf[BUFSIZE];
DWORD dwRead, dwWritten;
HANDLE hStdin, hStdout;
BOOL fSuccess;
hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
hStdin = GetStdHandle(STD_INPUT_HANDLE);
if ((hStdout == INVALID_HANDLE_VALUE) ||
(hStdin == INVALID_HANDLE_VALUE))
ExitProcess(1);
for (;;)
{
// Read from standard input.
fSuccess = ReadFile(hStdin, chBuf, BUFSIZE, &dwRead, NULL);
if (! fSuccess || dwRead == 0)
break;
// Write to standard output.
fSuccess = WriteFile(hStdout, chBuf, dwRead, &dwWritten, NULL);
if (! fSuccess)
break;
}
}
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--
class God : public ChuckNorris { };
Dieser Post wurde am 01.04.2004 um 11:08 Uhr von FloSoft editiert. |
