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    ▪onvif轨范的实现：成功实现ONVIF协议RTSP-Video-Stream与OnvifDeviceManager的视频对接        onvif规范的实现：成功实现ONVIF协议RTSP-Video-Stream与OnvifDeviceManager的视频对接有了前几篇的基础，现在可以正式开始onvif的实现工作，其中一项非常重要的部分就是视频流的对接，即能够在符合.........
    ▪ 关于wrap_content包裹.9图片的有关问题        关于wrap_content包裹.9图片的问题android所以.9图片作为背景，然后使用wrap_content属性包裹。 会出现将整个图片的撑大的情况。 此处俺使用了padding  属性 = 0dip来指定，就没有出现该情况了 ......
    ▪ object-c nsdata 读取跟写入二进制文件       object-c nsdata 读取和写入二进制文件-(void)test_file{     // 获取程序Documents目录路径     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);     NSString *documentsDirectory = [pa.........

[1]onvif轨范的实现：成功实现ONVIF协议RTSP-Video-Stream与OnvifDeviceManager的视频对接
    来源: 互联网  发布时间: 2014-02-18
onvif规范的实现：成功实现ONVIF协议RTSP-Video-Stream与OnvifDeviceManager的视频对接

有了前几篇的基础，现在可以正式开始onvif的实现工作，其中一项非常重要的部分就是视频流的对接，即能够在符合onvif标准的监控客户端软件里接收到设备端NVT发来的RTSP视频流。这里，我所用的客户端软件是Onvif Device Manager v2.2。【来自http://blog.csdn.net/ghostyu】

ONVIF Profile S Specification文档描述了Device或者说DVT和Client可以使用的一种Profile，Profile这个词在计算机领域非常常见，我们可以理解成一种方案、配置、框架等。

文档里描述了如果实现VideoStream，device和client应该具备的条件，当然如果实现文档的所有条件，就可以说该设备符合Profile S

如果单纯实现VideoStream，只需完成下列命令。

1、GetProfiles
2、GetStreamUri 
填充rtsp路径，例如：rtsp://192.168.1.201/petrov.m4e
3、Media Streaming using RTSP
这里使用开源的live555，完成rtsp功能
4、GetVideoEncoderConfiguration
5、GetVideoEncoderConfigurationOptions
6、GetCapabilities
NVC为了获取DVT所支持的功能的命令

参考文档：

1、ONVIF Profile S Specification
描述ProfileS是什么样的一个东西，如何实现
2、Reference_of_ONVIF_Development_v1.01.02
Onvif DVT设计参考，指明了一条道路，但没有具体内容
3、ONVIF-Media-Service-Spec-v220
Onvif Media的说明介绍
4、http://www.onvif.org/onvif/ver20/util/operationIndex.html
onvif几乎全部命令的详细说明，非常重要。该文档告诉我们结构体成员的意义和如何填充。Onvif开发其实就是各种结构体的填充。

一、产生onvif源码框架 1、从wsdl生成C头文件 

wsdl2h -o onvif.h -c -s -t .\typemap.dat http://www.onvif.org/onvif/ver10/device/wsdl/devicemgmt.wsdl http://www.onvif.org/onvif/ver10/event/wsdl/event.wsdl http://www.onvif.org/onvif/ver10/display.wsdl http://www.onvif.org/onvif/ver10/deviceio.wsdl http://www.onvif.org/onvif/ver20/imaging/wsdl/imaging.wsdl http://www.onvif.org/onvif/ver10/media/wsdl/media.wsdl http://www.onvif.org/onvif/ver20/ptz/wsdl/ptz.wsdl  http://www.onvif.org/onvif/ver10/receiver.wsdl http://www.onvif.org/onvif/ver10/recording.wsdl  http://www.onvif.org/onvif/ver10/search.wsdl http://www.onvif.org/onvif/ver10/network/wsdl/remotediscovery.wsdl http://www.onvif.org/onvif/ver10/replay.wsdl http://www.onvif.org/onvif/ver20/analytics/wsdl/analytics.wsdl http://www.onvif.org/onvif/ver10/analyticsdevice.wsdl  http://www.onvif.org/onvif/ver10/schema/onvif.xsd  http://www.onvif.org/ver10/actionengine.wsdl
跟前一篇discovery唯一不同的是，这里多了很多wsdl文件，这次创建完整的onvif代码框架

2、从头文件生成源码框架 

soapcpp2 -c onvif.h -x -I /root/onvif/gsoap-2.8/gsoap/import -I /root/onvif/gsoap-2.8/gsoap/
产生的C文件比较庞大，最大的有十几兆，大部分的内容没有复用导致。

二、创建soap运行环境 

int main(int argc, char **argv)  
{  
    int m, s;  
    struct soap add_soap;  
	int server_udp;

	server_udp = create_server_socket_udp();
	//bind_server_udp1(server_udp);
	pthread_t thrHello;
	pthread_t thrProbe;
	//pthread_create(&thrHello,NULL,main_Hello,server_udp);
	//sleep(2);
	pthread_create(&thrProbe,NULL,main_Probe,server_udp);

    soap_init(&add_soap);  
    soap_set_namespaces(&add_soap, namespaces);  


    if (argc < 0) {  
        printf("usage: %s <server_port> \n", argv[0]);  
        exit(1);  
    } else {  
        m = soap_bind(&add_soap, NULL, 80, 100);  
        if (m < 0) {  
            soap_print_fault(&add_soap, stderr);  
            exit(-1);  
        }  
        fprintf(stderr, "Socket connection successful: master socket = %d\n", m);  
        for (;;) {  
            s = soap_accept(&add_soap);  
            if (s < 0) {  
                soap_print_fault(&add_soap, stderr);  
                exit(-1);  
            }  
            fprintf(stderr, "Socket connection successful: slave socket = %d\n", s);  
            soap_serve(&add_soap);  
            soap_end(&add_soap);  
        }  
    }  
    return 0;  
}
注意，这里绑定了80端口，onvif使用的是http请求，然后附带xml，其实正常的是将onvif集成到web服务器中，普通的http请求有web服务器处理，onvif的http请求则有soap处理。我们这里的做法也可行，只不过onvif的访问web服务器的功能是无法使用的。

三、RTSP视频对接 1、实现GetCapabilities命令

客户端发送GetCapabilities命令来得到设备端的能力，然后依据GetCapabilities返回的结果再来进行下一步操作

在__tds__GetCapabilities函数中我们只需要填充Media部分和一些必要的即可

	//想要对接RTSP视频，必须设置Media
	tds__GetCapabilitiesResponse->Capabilities->Media = (struct tt__MediaCapabilities*)soap_malloc(soap, sizeof(struct tt__MediaCapabilities));
	tds__GetCapabilitiesResponse->Capabilities->Media->XAddr = (char *) soap_malloc(soap, sizeof(char) * LARGE_INFO_LENGTH);
	strcpy(tds__GetCapabilitiesResponse->Capabilities->Media->XAddr, _IPv4Address);
	tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities = (struct tt__RealTimeStreamingCapabilities*)soap_malloc(soap, sizeof(struct tt__RealTimeStreamingCapabilities));
	tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->RTPMulticast = (int *)soap_malloc(soap, sizeof(int));	
	*tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->RTPMulticast = _false;	
	tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->RTP_USCORETCP = (int *)soap_malloc(soap, sizeof(int));
	*tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->RTP_USCORETCP = _true;	
	tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->RTP_USCORERTSP_USCORETCP = (int *)soap_malloc(soap, sizeof(int));
	*tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->RTP_USCORERTSP_USCORETCP = _true;	
	tds__GetCapabilitiesResponse->Capabilities->Media->StreamingCapabilities->Extension = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Media->Extension = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Media->__size = 0;
	tds__GetCapabilitiesResponse->Capabilities->Media->__any = 0;
另外必要填充的还有 

	//下面的重要，这里只实现视频流，需要设置VideoSources
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->VideoSources = TRUE;
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->VideoOutputs = FALSE;
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->AudioSources = FALSE;
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->AudioOutputs = FALSE;
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->RelayOutputs = FALSE;
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->__size = 0;
	tds__GetCapabilitiesResponse->Capabilities->Extension->DeviceIO->__any = NULL;
	
	tds__GetCapabilitiesResponse->Capabilities->Extension->Display = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->Recording = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->Search = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->Replay = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->Receiver = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->AnalyticsDevice = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->Extensions = NULL;
	tds__GetCapabilitiesResponse->Capabilities->Extension->__size = 0;
	tds__GetCapabilitiesResponse->Capabilities->Extension->__any = NULL;
2、实现GetServices命令 

int  __tds__GetServices(struct soap* soap, struct _tds__GetServices *tds__GetServices, struct _tds__GetServicesResponse *tds__GetServicesResponse)
{
	DBG("__tds__GetServices\n");
	/*该函数很必要*/
	char _IPAddr[INFO_LENGTH];
	int i = 0;
	sprintf(_IPAddr, "http://%03d.%03d.%03d.%03d/onvif/services", 192, 168, 1, 233);
	tds__GetServicesResponse->__sizeService = 1;

	tds__GetServicesResponse->Service = (struct tds__Service *)soap_malloc(soap, sizeof(struct tds__Service));
	tds__GetServicesResponse->Service[0].XAddr = (char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);
	tds__GetServicesResponse->Service[0].Namespace = (char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);
	strcpy(tds__GetServicesResponse->Service[0].Namespace, "http://www.onvif.org/ver10/events/wsdl");
	strcpy(tds__GetServicesResponse[0].Service->XAddr, _IPAddr);
	tds__GetServicesResponse->Service[0].Capabilities = NULL;
	tds__GetServicesResponse->Service[0].Version = (struct tt__OnvifVersion *)soap_malloc(soap, sizeof(struct tt__OnvifVersion));
	tds__GetServicesResponse->Service[0].Version->Major = 0;
	tds__GetServicesResponse->Service[0].Version->Minor = 3;
	tds__GetServicesResponse->Service[0].__any = (char **)soap_malloc(soap, sizeof(char *));
	tds__GetServicesResponse->Service[0].__any[0] = (char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);
	strcpy(tds__GetServicesResponse->Service[0].__any[0],"why1");
	tds__GetServicesResponse->Service[0].__any[1] = (char *)soap_malloc(soap,sizeof(char) * INFO_LENGTH);
	strcpy(tds__GetServicesResponse->Service[0].__any[1],"why2");
	tds__GetServicesResponse->Service[0].__size = NULL;
	tds__GetServicesResponse->Service[0].__anyAttribute = NULL;
	return SOAP_OK;
}
3、实现GetVideoSources命令 
int  __tmd__GetVideoSources(struct soap* soap, struct _trt__GetVideoSources *trt__GetVideoSources, struct _trt__GetVideoSourcesResponse *trt__GetVideoSourcesResponse)
{
	DBG("__tmd__GetVideoSources\n");

	int size1;
	size1 = 1;
	trt__GetVideoSourcesResponse->__sizeVideoSources = size1;
	trt__GetVideoSourcesResponse->VideoSources = (struct tt__VideoSource *)soap_malloc(soap, sizeof(struct tt__VideoSource) * size1);
	trt__GetVideoSourcesResponse->VideoSources[0].Framerate = 30;
	trt__GetVideoSourcesResponse->VideoSources[0].Resolution = (struct tt__VideoResolution *)soap_malloc(soap, sizeof(struct tt__VideoResolution));
	trt__GetVideoSourcesResponse->VideoSources[0].Resolution->Height = 720;
	trt__GetVideoSourcesResponse->VideoSources[0].Resolution->Width = 1280;
	trt__GetVideoSourcesResponse->VideoSources[0].token = (char *)soap_malloc(soap, sizeof(char)*INFO_LENGTH);
	strcpy(trt__GetVideoSourcesResponse->VideoSources[0].token,"GhostyuSource_token"); //注意这里需要和GetProfile中的sourcetoken相同

	trt__GetVideoSourcesResponse->VideoSources[0].Imaging =(struct tt__ImagingSettings*)soap_malloc(soap, sizeof(struct tt__ImagingSettings));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Brightness = (float*)soap_malloc(soap,sizeof(float));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Brightness[0] = 128;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->ColorSaturation = (float*)soap_malloc(soap,sizeof(float));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->ColorSaturation[0] = 128;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Contrast = (float*)soap_malloc(soap,sizeof(float));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Contrast[0] = 128;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->IrCutFilter = (int *)soap_malloc(soap,sizeof(int));
	*trt__GetVideoSourcesResponse->VideoSources[0].Imaging->IrCutFilter = 0; 
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Sharpness = (float*)soap_malloc(soap,sizeof(float));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Sharpness[0] = 128;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->BacklightCompensation = (struct tt__BacklightCompensation*)soap_malloc(soap, sizeof(struct tt__BacklightCompensation));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->BacklightCompensation->Mode = 0;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->BacklightCompensation->Level = 20;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Exposure = NULL;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Focus = NULL;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WideDynamicRange = (struct tt__WideDynamicRange*)soap_malloc(soap, sizeof(struct tt__WideDynamicRange));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WideDynamicRange->Mode = 0;   
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WideDynamicRange->Level = 20;
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WhiteBalance = (struct tt__WhiteBalance*)soap_malloc(soap, sizeof(struct tt__WhiteBalance));
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WhiteBalance->Mode = 0;	
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WhiteBalance->CrGain = 0; 
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->WhiteBalance->CbGain = 0; 
	trt__GetVideoSourcesResponse->VideoSources[0].Imaging->Extension = NULL;
	trt__GetVideoSourcesResponse->VideoSources[0].Extension = NULL;	
	return SOAP_OK;
}
__tmd__GetVideoSources最重要的是token的填充，必须要和下面profile中的sourcetoken相同，需要匹配到这个视频源

4、实现GetProfiles命令 

	size = 1;
	trt__GetProfilesResponse->Profiles =(struct tt__Profile *)soap_malloc(soap, sizeof(struct tt__Profile) * size);
	trt__GetProfilesResponse->__sizeProfiles = size;

	i=0;
	trt__GetProfilesResponse->Profiles[i].Name = (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	strcpy(trt__GetProfilesResponse->Profiles[i].Name,"my_profile");
	trt__GetProfilesResponse->Profiles[i].token= (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	strcpy(trt__GetProfilesResponse->Profiles[i].token,"token_profile");
	trt__GetProfilesResponse->Profiles[i].fixed = _false;
	trt__GetProfilesResponse->Profiles[i].__anyAttribute = NULL;
除了上面的基本信息，还需要填充两大项：VideoSourceConfiguration和VideoEncoderConfiguration，一个用于描述视频源的信息，另外一个描述视频的编码信息

先给VideoSourceConfiguration分配空间

	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration = (struct tt__VideoSourceConfiguration *)soap_malloc(soap,sizeof(struct tt__VideoSourceConfiguration ));
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Name = (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->token = (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->SourceToken = (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Bounds = (struct tt__IntRectangle *)soap_malloc(soap,sizeof(struct tt__IntRectangle));
然后在填充它 

	/*注意SourceToken*/
	strcpy(trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Name,"VS_Name");
	strcpy(trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->token,"VS_Token");
	strcpy(trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->SourceToken,"GhostyuSource_token"); /*必须与__tmd__GetVideoSources中的token相同*/
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->UseCount = 1;
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Bounds->x = 1;
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Bounds->y = 1;
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Bounds->height = 720;
	trt__GetProfilesResponse->Profiles[i].VideoSourceConfiguration->Bounds->width = 1280;
如果是指针必须先用soap_malloc分配内存，然后才能赋值

下面是VideoEncoderConfiguration

	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration = (struct tt__VideoEncoderConfiguration *)soap_malloc(soap,sizeof(struct tt__VideoEncoderConfiguration));
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Name = (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->token= (char *)soap_malloc(soap,sizeof(char)*MAX_PROF_TOKEN);
	strcpy(trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Name,"VE_Name1");
	strcpy(trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->token,"VE_token1");
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->UseCount = 1;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Quality = 10;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Encoding = 1;//JPEG = 0, MPEG4 = 1, H264 = 2;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Resolution = (struct tt__VideoResolution *)soap_malloc(soap, sizeof(struct tt__VideoResolution));
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Resolution->Height = 720;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->Resolution->Width = 1280;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->RateControl = (struct tt__VideoRateControl *)soap_malloc(soap, sizeof(struct tt__VideoRateControl));
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->RateControl->FrameRateLimit = 30;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->RateControl->EncodingInterval = 1;
	trt__GetProfilesResponse->Profiles[i].VideoEncoderConfiguration->RateControl->BitrateLimit = 500;
5、GetVideoSourceConfiguration和GetVideoEncoderConfiguration 

int  __trt__GetVideoSourceConfiguration(struct soap* soap, struct _trt__GetVideoSourceConfiguration *trt__GetVideoSourceConfiguration, struct _trt__GetVideoSourceConfigurationResponse *trt__GetVideoSourceConfigurationResponse)
{
	DBG("__trt__GetVideoSourceConfiguration\n");
	//该函数必要，live video需要
	return SOAP_OK;
}

int  __trt__GetVideoEncoderConfiguration(struct soap* soap, struct _trt__GetVideoEncoderConfiguration *trt__GetVideoEncoderConfiguration, struct _trt__GetVideoEncoderConfigurationResponse *trt__GetVideoEncoderConfigurationResponse)
{
	DBG("__trt__GetVideoEncoderConfiguration\n");
	return SOAP_OK;
}

6、GetVideoEncoderConfigurationOptions 

int  __trt__GetVideoEncoderConfigurationOptions(struct soap* soap, struct _trt__GetVideoEncoderConfigurationOptions *trt__GetVideoEncoderConfigurationOptions, struct _trt__GetVideoEncoderConfigurationOptionsResponse *trt__GetVideoEncoderConfigurationOptionsResponse)
{
	DBG("__trt__GetVideoEncoderConfigurationOptions\n");
	//该函数必要，video streaming需要
	return SOAP_OK;
}
以上5、6不分的代码直接返回SOAP_OK即可，正常来说是应该填充的，这里不影响RTSP Video Stream，暂时就不去动它

四、运行live555MediaServer服务器

live555官网有很多测试文件，我这里用的是MPEG4的测试文件路劲为rtsp://192.168.1.201/petrov.m4e

五、启动Onvif Device Manager测试

有一个问题，OnvifDeviceManager的并不能自动发现设备（OnvifTestTool可以），还好它提供了手动添加功能

单击add，添加如下内容：http://192.168.1.233/onvif/device_service

注意，我在程序中固定了两个IP：linux192.168.1.233，windows：192.168.1.201，这里需看情况修改

测试截图：

1、Live video


2、Video streaming


3、Profiles


最后是运行的live555 rtsp服务器


终端打印的DEBUG信息


源代码下载地址：http://download.csdn.net/detail/ghostyu/4796093

【来自http://blog.csdn.net/ghostyu，ghostyu#163.com】


    
[2] 关于wrap_content包裹.9图片的有关问题
    来源: 互联网  发布时间: 2014-02-18
关于wrap_content包裹.9图片的问题

android所以.9图片作为背景，然后使用wrap_content属性包裹。 会出现将整个图片的撑大的情况。

此处俺使用了padding  属性 = 0dip来指定，就没有出现该情况了


    
[3] object-c nsdata 读取跟写入二进制文件
    来源: 互联网  发布时间: 2014-02-18
object-c nsdata 读取和写入二进制文件

-(void)test_file{

    // 获取程序Documents目录路径

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    

    NSMutableString * path = [[NSMutableString alloc]initWithString:documentsDirectory];

    [path appendString:@"/fuck"];

    NSString *temp = @"我现在要告诉我那你哈哈哈len 是不是Dang";

    NSInteger i = [[temp dataUsingEncoding:NSUTF8StringEncoding] length];

    

    NSMutableData * data = [[NSMutableData alloc]init];

    [data appendBytes:&i length:sizeof(i)];

    [data appendData:[temp dataUsingEncoding:NSUTF8StringEncoding]];

    

    

    

    [data writeToFile:path atomically:YES];

    

    

    NSInteger fuck = 0;

    NSString * fff ;

    NSData * reader = [NSData dataWithContentsOfFile:path];

    [reader getBytes:&fuck length:sizeof(fuck)];

   

    fff = [[NSString alloc] initWithData:[reader subdataWithRange:NSMakeRange(sizeof(fuck) , fuck)]

                                  encoding:NSUTF8StringEncoding];

    NSLog(@"%@" , fff);

    [fff release];

    [path release];

    [data release];

}


    
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