Golang C.CString类(方法)实例源码

// LoadHTML loads the given content string with the specified baseURI. The MIME
// type of the document will be "text/html".
//
// See also: webkit_web_view_load_html at
// http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#webkit-web-view-load-html
func (v *WebView) LoadHTML(content, baseURI string) {
	cContent := C.CString(content)
	defer C.free(unsafe.Pointer(cContent))
	cBaseURI := C.CString(baseURI)
	defer C.free(unsafe.Pointer(cBaseURI))
	C.webkit_web_view_load_html(v.webView, (*C.gchar)(cContent), (*C.gchar)(cBaseURI))
}

func (v *WebKitWebView) LoadHtmlString(content, base_uri string) {
	pcontent := C.CString(content)
	defer C.free_string(pcontent)
	pbase_uri := C.CString(base_uri)
	defer C.free_string(pbase_uri)
	C.webkit_web_view_load_html_string(v.getWebView(), C.to_gcharptr(pcontent), C.to_gcharptr(pbase_uri))
}

func (c *driverConn) Prepare(query string) (driver.Stmt, error) {
	// Generate unique statement name.
	stmtname := strconv.Itoa(c.stmtNum)
	cstmtname := C.CString(stmtname)
	c.stmtNum++
	defer C.free(unsafe.Pointer(cstmtname))
	stmtstr := C.CString(query)
	defer C.free(unsafe.Pointer(stmtstr))
	res := C.PQprepare(c.db, cstmtname, stmtstr, 0, nil)
	err := resultError(res)
	if err != nil {
		C.PQclear(res)
		return nil, err
	}
	stmtinfo := C.PQdescribePrepared(c.db, cstmtname)
	err = resultError(stmtinfo)
	if err != nil {
		C.PQclear(stmtinfo)
		return nil, err
	}
	defer C.PQclear(stmtinfo)
	nparams := int(C.PQnparams(stmtinfo))
	statement := &driverStmt{stmtname, c.db, res, nparams}
	runtime.SetFinalizer(statement, (*driverStmt).Close)
	return statement, nil
}

func (v *Reference) Rename(name string, force bool, sig *Signature, msg string) (*Reference, error) {
	var ptr *C.git_reference
	cname := C.CString(name)
	defer C.free(unsafe.Pointer(cname))

	csig := sig.toC()
	defer C.free(unsafe.Pointer(csig))

	var cmsg *C.char
	if msg == "" {
		cmsg = nil
	} else {
		cmsg = C.CString(msg)
		defer C.free(unsafe.Pointer(cmsg))
	}

	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	ret := C.git_reference_rename(&ptr, v.ptr, cname, cbool(force), csig, cmsg)

	if ret < 0 {
		return nil, MakeGitError(ret)
	}

	return newReferenceFromC(ptr), nil
}

func (provider *Provider) AddProbe(function string, name string, signature ...reflect.Kind) Probe {
	cFunction := C.CString(function)
	cName := C.CString(name)
	defer C.free(unsafe.Pointer(cFunction))
	defer C.free(unsafe.Pointer(cName))

	cTypes := make([]*C.char, len(signature))

	for i, kind := range signature {
		switch kind {
		case reflect.Int:
			cTypes[i] = C.CString("int")
			defer C.free(unsafe.Pointer(cTypes[i]))
		case reflect.String:
			cTypes[i] = C.CString("char *")
			defer C.free(unsafe.Pointer(cTypes[i]))
		default:
			cTypes[i] = nil
		}
	}

	probedef := C.usdt_create_probe(cFunction, cName, C.size_t(len(signature)), &cTypes[0])
	C.usdt_provider_add_probe(provider.provider_t, probedef)

	newProbe := Probe{
		function,
		name,
		probedef,
	}

	provider.Probes = append(provider.Probes, newProbe)

	return newProbe
}

func (e Enumerate) AddNoMatchSysAttr(sysattr string, value string) error {
	err := C.udev_enumerate_add_match_sysattr(e.ptr, C.CString(sysattr), C.CString(value))
	if err != 0 {
		return Error(err)
	}
	return nil
}

// GetApproximateSizes returns the approximate number of bytes of file system
// space used by one or more key ranges.
//
// The keys counted will begin at Range.Start and end on the key before
// Range.Limit.
func (db *DB) GetApproximateSizes(ranges []Range) []uint64 {
	starts := make([]*C.char, len(ranges))
	limits := make([]*C.char, len(ranges))
	startLens := make([]C.size_t, len(ranges))
	limitLens := make([]C.size_t, len(ranges))
	for i, r := range ranges {
		starts[i] = C.CString(string(r.Start))
		startLens[i] = C.size_t(len(r.Start))
		limits[i] = C.CString(string(r.Limit))
		limitLens[i] = C.size_t(len(r.Limit))
	}
	sizes := make([]uint64, len(ranges))
	numranges := C.int(len(ranges))
	startsPtr := &starts[0]
	limitsPtr := &limits[0]
	startLensPtr := &startLens[0]
	limitLensPtr := &limitLens[0]
	sizesPtr := (*C.uint64_t)(&sizes[0])
	C.hyperleveldb_rocksdb_approximate_sizes(
		db.Ldb, numranges, startsPtr, startLensPtr,
		limitsPtr, limitLensPtr, sizesPtr)
	for i := range ranges {
		C.free(unsafe.Pointer(starts[i]))
		C.free(unsafe.Pointer(limits[i]))
	}
	return sizes
}

// ConfigureTUN sets up the tun device, this is equivalent to the
// badvpn-tun2socks configuration, except for the --socks-server-addr.
func ConfigureTUN(tundev, ipaddr, netmask, udpgw string, d dialer) error {
	if d == nil {
		d = dummyDialer
	}

	Dialer = d
	udpGwServerAddress = udpgw

	ctundev := C.CString(tundev)
	cipaddr := C.CString(ipaddr)
	cnetmask := C.CString(netmask)
	cudpgw_addr := C.CString(udpgw)

	defer func() {
		C.free(unsafe.Pointer(ctundev))
		C.free(unsafe.Pointer(cipaddr))
		C.free(unsafe.Pointer(cnetmask))
		C.free(unsafe.Pointer(cudpgw_addr))
	}()

	log.Printf("Configuring with TUN device...")

	if err_t := C.configure_tun(ctundev, cipaddr, cnetmask, cudpgw_addr); err_t != C.ERR_OK {
		return errors.New("Failed to configure device.")
	}

	return nil
}

// Publish publishes an announcement at an interval
func (b *Beacon) Publish(announcement string, interval int) error {
	cmd := C.CString("PUBLISH")
	defer C.free(unsafe.Pointer(cmd))

	cAnnouncement := C.CString(announcement)
	defer C.free(unsafe.Pointer(cAnnouncement))

	cInterval := C.CString(strconv.Itoa(interval))
	defer C.free(unsafe.Pointer(cInterval))

	rc := C.zstr_sendm(unsafe.Pointer(b.zactorT), cmd)
	if rc == -1 {
		return ErrActorCmd
	}

	rc = C.zstr_sendm(unsafe.Pointer(b.zactorT), cAnnouncement)
	if rc == -1 {
		return ErrActorCmd
	}

	rc = C.zstr_send(unsafe.Pointer(b.zactorT), cInterval)
	if rc == -1 {
		return ErrActorCmd
	}

	return nil
}

// CurrentUnitName attempts to retrieve the name of the systemd system unit
// from which the calling process has been invoked. It wraps the systemd
// `sd_pid_get_unit` call, with the same caveat: for processes not part of a
// systemd system unit, this function will return an error.
func CurrentUnitName() (unit string, err error) {
	var h *libHandle
	h, err = getHandle()
	if err != nil {
		return
	}
	defer func() {
		if err1 := h.Close(); err1 != nil {
			err = err1
		}
	}()

	sym := C.CString("sd_pid_get_unit")
	defer C.free(unsafe.Pointer(sym))
	sd_pid_get_unit := C.dlsym(h.handle, sym)
	if sd_pid_get_unit == nil {
		err = fmt.Errorf("error resolving sd_pid_get_unit function")
		return
	}

	var s string
	u := C.CString(s)
	defer C.free(unsafe.Pointer(u))

	ret := C.my_sd_pid_get_unit(sd_pid_get_unit, 0, &u)
	if ret < 0 {
		err = fmt.Errorf("error calling sd_pid_get_unit: %v", syscall.Errno(-ret))
		return
	}

	unit = C.GoString(u)
	return
}

// ConfigureFD sets up the tun device using a file descriptor.
func ConfigureFD(tunFd int, tunMTU int, ipaddr, netmask, udpgw string, d dialer) error {
	if d == nil {
		d = dummyDialer
	}

	Dialer = d
	udpGwServerAddress = udpgw

	ctunFd := C.int(tunFd)
	ctunMTU := C.int(tunMTU)
	cipaddr := C.CString(ipaddr)
	cnetmask := C.CString(netmask)
	cudpgw_addr := C.CString(udpgw)

	defer func() {
		C.free(unsafe.Pointer(cipaddr))
		C.free(unsafe.Pointer(cnetmask))
		C.free(unsafe.Pointer(cudpgw_addr))
	}()

	log.Printf("Configuring with file descriptor...")

	if err_t := C.configure_fd(ctunFd, ctunMTU, cipaddr, cnetmask, cudpgw_addr); err_t != C.ERR_OK {
		return errors.New("Failed to configure device.")
	}

	return nil
}

// GetRunningSlice attempts to retrieve the name of the systemd slice in which
// the current process is running.
// This function is a wrapper around the libsystemd C library; if it cannot be
// opened, an error is returned.
func GetRunningSlice() (slice string, err error) {
	var h *libHandle
	h, err = getHandle()
	if err != nil {
		return
	}
	defer func() {
		if err1 := h.Close(); err1 != nil {
			err = err1
		}
	}()

	sym := C.CString("sd_pid_get_slice")
	defer C.free(unsafe.Pointer(sym))
	sd_pid_get_slice := C.dlsym(h.handle, sym)
	if sd_pid_get_slice == nil {
		err = fmt.Errorf("error resolving sd_pid_get_slice function")
		return
	}

	var s string
	sl := C.CString(s)
	defer C.free(unsafe.Pointer(sl))

	ret := C.my_sd_pid_get_slice(sd_pid_get_slice, 0, &sl)
	if ret < 0 {
		err = fmt.Errorf("error calling sd_pid_get_slice: %v", syscall.Errno(-ret))
		return
	}

	return C.GoString(sl), nil
}

func (repo *Repository) CreateBranch(branchName string, target *Commit, force bool, signature *Signature, msg string) (*Branch, error) {

	ref := new(Reference)
	cBranchName := C.CString(branchName)
	cForce := cbool(force)

	cSignature, err := signature.toC()
	if err != nil {
		return nil, err
	}
	defer C.git_signature_free(cSignature)

	var cmsg *C.char
	if msg == "" {
		cmsg = nil
	} else {
		cmsg = C.CString(msg)
		defer C.free(unsafe.Pointer(cmsg))
	}

	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	ret := C.git_branch_create(&ref.ptr, repo.ptr, cBranchName, target.cast_ptr, cForce, cSignature, cmsg)
	if ret < 0 {
		return nil, MakeGitError(ret)
	}
	return ref.Branch(), nil
}

func (b *Branch) Move(newBranchName string, force bool, signature *Signature, msg string) (*Branch, error) {
	var ptr *C.git_reference
	cNewBranchName := C.CString(newBranchName)
	cForce := cbool(force)

	cSignature, err := signature.toC()
	if err != nil {
		return nil, err
	}
	defer C.git_signature_free(cSignature)

	var cmsg *C.char
	if msg == "" {
		cmsg = nil
	} else {
		cmsg = C.CString(msg)
		defer C.free(unsafe.Pointer(cmsg))
	}

	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	ret := C.git_branch_move(&ptr, b.Reference.ptr, cNewBranchName, cForce, cSignature, cmsg)
	if ret < 0 {
		return nil, MakeGitError(ret)
	}
	return newReferenceFromC(ptr, b.repo).Branch(), nil
}

func sqlOpen(name string, flags int, vfs string) (conn *sqlConnection, rc int) {
	conn = new(sqlConnection)

	p := C.CString(name)
	if len(vfs) > 0 {
		q := C.CString(vfs)
		rc = int(C.sqlite3_open_v2(p, &conn.handle, C.int(flags), q))
		C.free(unsafe.Pointer(q))
	} else {
		rc = int(C.sqlite3_open_v2(p, &conn.handle, C.int(flags), nil))
	}
	C.free(unsafe.Pointer(p))

	// We could get a handle even if there's an error, see
	// http://www.sqlite.org/c3ref/open.html for details.
	// Initially we didn't want to return a connection on
	// error, but we actually have to since we want to fill
	// in a SystemError struct. Sigh.
	//	if rc != StatusOk && conn.handle != nil {
	//		_ = conn.sqlClose();
	//		conn = nil;
	//	}

	return
}

// void dsyevd_(char *jobz, char *uplo, int *n, double *A, int *ldA, double *W,
//		double *work, int *lwork, int *iwork, int *liwork, int *info);
func dsyevd(jobz, uplo string, N int, A []float64, lda int, W []float64) int {
	var info int = 0
	var lwork int = -1
	var liwork int = -1
	var iwork int32
	var work float64

	cjobz := C.CString(jobz)
	defer C.free(unsafe.Pointer(cjobz))
	cuplo := C.CString(uplo)
	defer C.free(unsafe.Pointer(cuplo))

	// pre-calculate work buffer size
	C.dsyevd_(cjobz, cuplo, (*C.int)(unsafe.Pointer(&N)), nil,
		(*C.int)(unsafe.Pointer(&lda)), nil,
		(*C.double)(unsafe.Pointer(&work)), (*C.int)(unsafe.Pointer(&lwork)),
		(*C.int)(unsafe.Pointer(&iwork)), (*C.int)(unsafe.Pointer(&liwork)),
		(*C.int)(unsafe.Pointer(&info)))

	// allocate work area
	lwork = int(work)
	wbuf := make([]float64, lwork)
	liwork = int(iwork)
	wibuf := make([]int32, liwork)

	C.dsyevd_(cjobz, cuplo, (*C.int)(unsafe.Pointer(&N)),
		(*C.double)(unsafe.Pointer(&A[0])),
		(*C.int)(unsafe.Pointer(&lda)), (*C.double)(unsafe.Pointer(&W[0])),
		(*C.double)(unsafe.Pointer(&wbuf[0])), (*C.int)(unsafe.Pointer(&lwork)),
		(*C.int)(unsafe.Pointer(&wibuf[0])), (*C.int)(unsafe.Pointer(&liwork)),
		(*C.int)(unsafe.Pointer(&info)))
	return info
}

func (conn *connection) performLogon(dsn string) error {

	user, pwd, host := parseDsn(dsn)
	puser := C.CString(user)
	defer C.free(unsafe.Pointer(puser))
	ppwd := C.CString(pwd)
	defer C.free(unsafe.Pointer(ppwd))
	phost := C.CString(host)
	defer C.free(unsafe.Pointer(phost))

	result := C.OCILogon2((*C.OCIEnv)(unsafe.Pointer(conn.env)),
		(*C.OCIError)(conn.err),
		(**C.OCIServer)(unsafe.Pointer(&conn.svr)),
		(*C.OraText)(unsafe.Pointer(puser)),
		C.ub4(C.strlen(puser)),
		(*C.OraText)(unsafe.Pointer(ppwd)),
		C.ub4(C.strlen(ppwd)),
		(*C.OraText)(unsafe.Pointer(phost)),
		C.ub4(C.strlen(phost)),
		C.OCI_LOGON2_STMTCACHE)
	if result != C.OCI_SUCCESS {
		return ociGetError(conn.err)
	}
	return nil
}

func NewTrailDBConstructor(path string, ofields ...string) (*TrailDBConstructor, error) {
	cons := C.tdb_cons_init()
	cpath := C.CString(path)
	defer C.free(unsafe.Pointer(cpath))

	var ofield_p *C.char
	ptrSize := unsafe.Sizeof(ofield_p)

	// Allocate the char** list.
	ptr := C.malloc(C.size_t(len(ofields)) * C.size_t(ptrSize))
	defer C.free(ptr)

	// Assign each byte slice to its appropriate offset.
	for i := 0; i < len(ofields); i++ {
		element := (**C.char)(unsafe.Pointer(uintptr(ptr) + uintptr(i)*ptrSize))
		cofield := C.CString(ofields[i])
		defer C.free(unsafe.Pointer(cofield))
		*element = cofield
	}

	if err := C.tdb_cons_open(cons, cpath, (**C.char)(ptr), C.uint64_t(len(ofields))); err != 0 {
		return nil, errors.New(errToString(err))
	}
	return &TrailDBConstructor{
		cons:         cons,
		path:         path,
		ofields:      ofields,
		valueLengths: make([]C.uint64_t, len(ofields)),
		valuePtr:     C.malloc(C.size_t(len(ofields)) * C.size_t(ptrSize)),
	}, nil
}

func (e Enumerate) AddMatchProperty(property string, value string) error {
	err := C.udev_enumerate_add_match_property(e.ptr, C.CString(property), C.CString(value))
	if err != 0 {
		return Error(err)
	}
	return nil
}

func (p *Comment) AddTag(tag string, contents string) {
	cTag := C.CString(tag)
	cContents := C.CString(contents)
	C.vorbis_comment_add_tag((*C.vorbis_comment)(p), cTag, cContents)
	C.free(unsafe.Pointer(cTag))
	C.free(unsafe.Pointer(cContents))
}