CN102866868B - GDI hook technology is utilized to realize the method for watermark printing - Google Patents

Abstract

The invention discloses a kind of method that the GDI of utilization hook technology realizes watermark printing, the method comprises acquisition watermark feature, install to print and filter, catch printing, analyze printing, generate watermark bitmap, draw watermark, the method is applicable to dissimilar printer apparatus, by adopting GDI hook technology, when not replacing printed driver, can to being set to text, picture, the watermark of handwriting tracks is carried out accurately, printing speed, simultaneously, this method has nothing to do with the application program initiating printing, achieve the versatility that watermark prints, drastically increase the efficiency printing watermark, efficient salvo is provided for printing behavior mandate and divulging a secret to trace to the source.

Description

GDI hook technology is utilized to realize the method for watermark printing

Technical field

The invention belongs to computer security technique field, relate to the watermark Method of printing that a kind of protected data prevents from safely divulging a secret, particularly relate to a kind of method that the GDI of utilization hook technology realizes watermark printing.

Background technology

At present, printing device has been widely used in working environment, for people bring convenience while also improve the risk that confidential information leaks.In order to authorize the document print behavior comprising the important informations such as company's secret, finance, need a kind of printed signature technology, meanwhile, this signature technology is also traced to the source for divulging a secret and is provided important evidence.Current, printed signature technology mainly contains two kinds: the first is manual mode, requires that printing person or other related personnel sign, when file number of pages is a lot of on each page file printed, one by one in every one page good sign name very labor intensive and time, efficiency is very low; The second utilizes watermark printing technique by signature process robotization, in print procedure, is automatically every page and embeds watermark, not only substantially increase work efficiency, also maintain unitarity and the accuracy of signature contents simultaneously.

In the prior art, the method realizing watermark printing is the printed driver printed by the watermark that provides support, and is embedded in printer page, completes watermark print procedure by this driver by watermark.The driver that the method first must adjust every platform printer is arranged, and original driver is replaced with the driver supporting that watermark prints.In a fairly large network environment, some printers may be there are, in adjustment network, the driver of all printers arranges and can consume certain manpower and time, produce extra cost, and when purchasing new printer or movement and again settle printer, also need to adjust its driver.

Therefore need a kind of watermark Method of printing, under the prerequisite of not replacing the original printed driver of printer, realize watermark and print.

Summary of the invention

The invention provides and utilize GDI(Graphics Device Interface) hook technology realize watermark print method, for solving the deficiencies in the prior art part.Under the prerequisite of not replacing printed driver, realize watermark and print.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

Utilize GDI hook technology to realize the method for watermark printing, comprise following steps:

A. watermark feature is obtained: obtain watermark feature, by this watermark characteristic storage in internal memory;

Described watermark feature comprises: watermark Source Type, watermark source value, transparency, angle;

Described watermark Source Type comprises: text, picture, handwriting tracks;

B. install print filter: by carry GDI(Graphics Device Interface) printed document event notice routine, complete install print filter.

C. printing is caught: utilize printing filtration to catch printing, obtain the contextual information entrained by printing;

Described contextual information comprises: event type, device context handle (device context handle);

Described event type comprises: create device context, start print job, start the page, terminate the page, terminate print job, sweep equipment context, reconfiguring equipment context;

D. analyze printing: the event type in the contextual information entrained by printing judges, if event type starts the page, then continue to perform step e; If event type is not start the page, then terminate;

E. watermark bitmap is generated: create a compatible bitmap (compatible bitmap), according to described watermark Source Type, transparency, angle, watermark source value be plotted in described compatible bitmap;

F. watermark is drawn: be plotted on printer page by described watermark bitmap.

In described step f, described watermark bitmap is plotted on printer page, further comprising the steps:

F1. obtain the background mixed mode (background mix mode) of device context handle, this background mixed mode is kept in internal memory;

F2. the background mixed mode of device context handle is set to transparent mode;

F3. watermark bitmap is plotted on printer page;

F4. the background mixed mode of device context handle is reverted in step f1 the background mixed mode be kept in internal memory.

Beneficial effect of the present invention is: the method is applicable to dissimilar printer apparatus; by adopting GDI hook technology; when not replacing printed driver; can to be set to text, picture, handwriting tracks watermark carry out accurately, printing speed; simultaneously; this method has nothing to do with the application program initiating printing; achieve the versatility that watermark prints; drastically increase the efficiency printing watermark, provide efficient salvo for printing behavior mandate and divulging a secret to trace to the source.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of the method that watermark of the present invention prints;

Fig. 2 is the process flow diagram of the step f of the method that watermark of the present invention prints;

Fig. 3 is the structural representation of embodiments of the invention.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with real-time mode and accompanying drawing, the present invention is described in further details.At this, the shows in schematic form of the embodiment of the present invention and illustrating for explaining the embodiment of the present invention, but not as the restriction to the embodiment of the present invention.

As shown in Figure 3, such as in a large-scale network environment, this network environment comprises hand-written drawing input equipment 301, computing machine 302, printing server 303, public printing device, this public printing device is the printer 304 that a Daepori is logical, by obtaining watermark feature on computer 302, installing operations such as printing filtration, then, realize printer 304 watermark is printed accurately and efficiently.Such as, printing personnel print the EXCEL document that a number of pages is 100 pages, document title is " company Annual financial statement .xls " on computer 302, in order to guarantee company's financial statement output safety, need printing personnel on every one page of corporate financial statements, sign the name " Han Mei " of printing personnel in the mode of watermark, printing personnel by inputting " Han Mei " on hand-written drawing input equipment 301, and generate " signature .jpg " picture, by USB interface will " signature .jpg " be saved to computing machine 302 D: work under path.Meanwhile, require that the transparency of " signature .jpg " is set to 80% by printing personnel, the angle in corporate financial statements is set to+15 degree (horizontal level).

As shown in Figure 1, the GDI of the utilization hook technology of the present invention step that realizes watermark Method of printing is as follows:

A. obtain watermark feature 101: computing machine 302 obtains watermark feature: watermark Source Type is picture, watermark source value be D: work signature .jpg, transparency 80%, angle+15 spend (horizontal level), and by described watermark characteristic storage in internal memory;

B. install and print filtration 102: computing machine 302, by the printed document event notice routine of carry Graphics Device Interface (GDI), completes to install to print and filters;

C. printing 103 is caught: computing machine 302 utilizes printing filtration to catch printing, obtains event type " the beginning page ", device context handle (device context handle) entrained by printing;

D. analyze printing 104: the event type that computing machine 302 carries according to printing judges, this event type of the present embodiment starts the page, continues to perform step e, to generate watermark bitmap; (if event type is not start the page, then terminate, can not generate watermark bitmap);

E. watermark bitmap 105 is generated; Computing machine 302 creates a compatible bitmap (compatible bitmap), is plotted in described compatible bitmap by described watermark Source Type " picture ", watermark source value " D: work signature .jpg ", transparency 80%, angle+15 degree (horizontal level);

F. watermark 106 is drawn: described compatible bitmap is plotted on printer page, below concrete steps by computing machine 302:

Step 201: the background mixed mode (background mix mode) " non-transparent mode " of the device context handle that computing machine 302 obtaining step 103 captures, by this background mixed mode---" non-transparent mode " is kept in internal memory;

Step 202: the background mixed mode of described device context handle is set to transparent mode by computing machine 302;

Step 203: the compatible bitmap that step 105 generates by computing machine 302 is plotted on printer page;

Step 204: the background mixed mode " transparent mode " of device context handle is reverted to step 201 and is kept at " non-transparent mode " in internal memory by computing machine 302.

Pass through said method, without the need to adjusting the driver of printing server 303, computing machine 302 is according to the compatible bitmap of watermark feature-modeling, and this compatible bitmap is plotted on printer page, then, perform common printing, it is the corporate financial statements .xls of 100 pages embeds transparency is 80%, angle be+15 degree (horizontal level) words to sign the print procedures of " Han Mei " that printer 304 can complete number of pages.

Said method avoids by artificial mode the process of the more document of number of pages carrying out a large amount of signature, save the more time, not only increase the work efficiency of signature, ensure that accuracy and the unitarity of signature, also improve the security of confidential document simultaneously, effectively stop the behavior that leaks of confidential document.

Method of the present invention is not only applicable to the watermark pattern of picture, and is applicable to handwriting tracks and text.Under comparatively complex network environment, by adopting GDI hook technology, without the need to replacing printed driver, all can realize the accurate printing of watermark, achieving the versatility that watermark prints, saving a large amount of manpowers and material resources, greatly improve work efficiency.

Claims (2)

1. utilize GDI hook technology to realize a method for watermark printing, comprise following steps:

A. watermark feature is obtained: obtain watermark feature, by this watermark characteristic storage in internal memory;

Described watermark feature comprises: watermark Source Type, watermark source value, transparency, angle;

Described watermark Source Type comprises: text, picture, handwriting tracks;

B. install to print and filter: by the printed document event notice routine of carry GDI, complete to install to print and filter;

C. printing is caught: utilize printing filtration to catch printing, obtain the contextual information entrained by printing;

Described contextual information comprises: event type, device context handle;

Described event type comprises: create device context, start print job, start the page, terminate the page, terminate print job, sweep equipment context, reconfiguring equipment context;

D. analyze printing: the event type in the contextual information entrained by printing judges, if event type starts the page, then continue to perform step e; If event type is not start the page, then terminate;

E. watermark bitmap is generated: create a compatible bitmap, according to described watermark Source Type, transparency, angle, watermark source value be plotted in described compatible bitmap;

F. watermark is drawn: be plotted on printer page by described watermark bitmap.

2. utilize GDI hook technology to realize the method for watermark printing as claimed in claim 1, it is characterized in that: in described step f, watermark bitmap is plotted on printer page, comprises the following steps:

F1. obtain the background mixed mode of device context handle, this background mixed mode is kept in internal memory;

F2. the background mixed mode of device context handle is set to transparent mode;

F3. watermark bitmap is plotted on printer page;

F4. the background mixed mode of device context handle is reverted in step f1 the background mixed mode be kept in internal memory.