在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
1|H4]!7kE
d^!3&y& 一、实现方法
\b!E"I_^ gn~^Ajo 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
%VR{<{3f ,1~zMzw ^ #pragma data_seg("shareddata")
VSV]6$~H HHOOK hHook =NULL; //钩子句柄
aE3eYl9u UINT nHookCount =0; //挂接的程序数目
]$^HGmP static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
1x\k:2U static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
98?O[= static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
-J#RGB{7 static int KeyCount =0;
-m>3@"q static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
=Bm|9A1 #pragma data_seg()
\ )>#`X IqsUtWSp 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
'!?t+L%gO >g~IP> DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
t#y,9>6
6Bcr.` BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
1n7'\esC* cKey,UCHAR cMask)
$G }9iV7 {
{.KD#W
$5 BOOL bAdded=FALSE;
P2C>IS for(int index=0;index<MAX_KEY;index++){
a;-%C{S9r if(hCallWnd[index]==0){
I\c7V~^hnG hCallWnd[index]=hWnd;
QUvSeNSp HotKey[index]=cKey;
%N(>B_t\ HotKeyMask[index]=cMask;
c$BH`" <* bAdded=TRUE;
HJym|G>%? KeyCount++;
Pi9?l> break;
XD0a :T) }
P6ktA-Hv> }
LayK&RwL return bAdded;
}YM\IPsPu }
e<a*@
P, //删除热键
.7 LQ l? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
d]^m^ {
'wMvO{}$ BOOL bRemoved=FALSE;
$o\z4_I for(int index=0;index<MAX_KEY;index++){
L+
XAbL) if(hCallWnd[index]==hWnd){
AL,7rYZG$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
IEP|j;~* hCallWnd[index]=NULL;
d8+@K&z| HotKey[index]=0;
dKU:\y HotKeyMask[index]=0;
N81M9#,["~ bRemoved=TRUE;
"X;5*
4+ KeyCount--;
[uHC
AP break;
ScD
E)r }
3T,[ }
U/cj_}uX }
3RvDX p return bRemoved;
mv~?1aIKD }
zb"4_L@m2 )rAJ>; '@M"#`#0 DLL中的钩子函数如下:
T{m) = (q $0un`&W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
nTwJR {
8Lx1XbwK BOOL bProcessed=FALSE;
= _N[mR^ if(HC_ACTION==nCode)
qnWM %k {
V rx,'/IS8 if((lParam&0xc0000000)==0xc0000000){// 有键松开
(y&sUc9 switch(wParam)
B9$f y).Gp {
GRkN0|ovfj case VK_MENU:
|>'N^ MaskBits&=~ALTBIT;
9Oq(` 4 break;
|K{d5\_ case VK_CONTROL:
UA2KY}pz5 MaskBits&=~CTRLBIT;
5~jz| T}s break;
U] GD6q case VK_SHIFT:
"M /Cl|z
MaskBits&=~SHIFTBIT;
n=F
r v*"Z break;
oaPWeM+ default: //judge the key and send message
5G(dvM-n break;
HQ7g0:-^a> }
|mHf7gCX for(int index=0;index<MAX_KEY;index++){
l:JVt`A4? if(hCallWnd[index]==NULL)
;fW~Gb?" continue;
FBB<1( {A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G}+@C] {
{I$iD SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
E"S#d&9 bProcessed=TRUE;
|o9`h 9i }
C,$o+q*)W9 }
w%iwxo }
2@
9? ~?r else if((lParam&0xc000ffff)==1){ //有键按下
G/(,,T}eG switch(wParam)
<DR!AR) {
_Y]Oloo(' case VK_MENU:
4Otq3s34FT MaskBits|=ALTBIT;
GQhy4ji'z break;
j3`YaWw case VK_CONTROL:
hi/d%lNZ MaskBits|=CTRLBIT;
\#VWZ\M8a break;
_
A#lyp case VK_SHIFT:
Qox /abC
h MaskBits|=SHIFTBIT;
A s}L=2 break;
dhnX\/ default: //judge the key and send message
!y/e
Fx break;
%g@\SR. }
DC1.f(cdR for(int index=0;index<MAX_KEY;index++){
3BD&;.<r if(hCallWnd[index]==NULL)
[r3sk24 continue;
Eri007? D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4uMMf {
An0N'yo"Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
T|D^kL%m! bProcessed=TRUE;
jN*wbqL }
{J,"iJKop }
%cUC~, g_( }
jnztCNaX if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
]cS(2hP7 for(int index=0;index<MAX_KEY;index++){
a)=|{QR>W if(hCallWnd[index]==NULL)
O< /b]<[ continue;
kBrA ? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
\<T7EV. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
H?Q--pG8 //lParam的意义可看MSDN中WM_KEYDOWN部分
-=gI_wLbM }
%W7%] Z@j }
\z FCph4 }
v^s?=9 return CallNextHookEx( hHook, nCode, wParam, lParam );
0|j44e} }
~?fl8RF\ MD<x{7O12> 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
Db*b"/] Y,}h{*9Kd BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
cNmAr8^} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
R13k2jLSQ JeNX5bXW 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
% 33O)<? wL3RcXW``e LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
G/#<d-}_ {
[f lK if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
=P9rOK= {
k\T]*A //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
G<<;a SaveBmp();
Q(yg bT return FALSE;
I ZLCwaW }
/.!&d^ …… //其它处理及默认处理
L xIKH
G }
F02TM#Zi - ry Yu_
eCq5/ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
(2L,m ~J+
qIZge 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
e],(d7 Jo RfD#/G3| 二、编程步骤
U_gkO;s% *!BQ1] G 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
=1R
2`H\ =LK`mNA 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
.B2e$`s$ kJO Z;X=9/ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
m,q)lbRl }wvR s5;o 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Gsy>"T{CY y_q1Y70i2r 5、 添加代码,编译运行程序。
;R2A>f~ BCz4
s{F 三、程序代码
er1XZ JLo E)\Mi ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
R[v<mo[s #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
L&:A59)1k #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
0Qvr
g+ #if _MSC_VER > 1000
DO*6gzW #pragma once
#4LTUVH #endif // _MSC_VER > 1000
Op~:z<z #ifndef __AFXWIN_H__
7]5~ml3: #error include 'stdafx.h' before including this file for PCH
Lk#)VGk: #endif
u #}1
M #include "resource.h" // main symbols
Oe@w$? class CHookApp : public CWinApp
PX&}g-M9 {
t5K#nRd Z: public:
V?x&\<;, CHookApp();
A&v Qtd // Overrides
Bd=K40Z: // ClassWizard generated virtual function overrides
(,+#H]L //{{AFX_VIRTUAL(CHookApp)
$t"QLsk0 public:
+N+117m virtual BOOL InitInstance();
*& );-r`. virtual int ExitInstance();
Sw-2vnSdM //}}AFX_VIRTUAL
cyHbAtl //{{AFX_MSG(CHookApp)
%Y'/_
esH2 // NOTE - the ClassWizard will add and remove member functions here.
U*sQ5uq // DO NOT EDIT what you see in these blocks of generated code !
S\t!7Xs%*U //}}AFX_MSG
ebCS4&c DECLARE_MESSAGE_MAP()
L1Yj9i };
'w72i/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=X[?d/[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!XI9evJw BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
GtIAsC03 BOOL InitHotkey();
)y:))\> BOOL UnInit();
$J)`Ru6. #endif
r]D>p&4 }u0&> k|y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
+cmi?~KS* #include "stdafx.h"
<GQ=PrT|/ #include "hook.h"
\vV]fX #include <windowsx.h>
u6l)s0Q #ifdef _DEBUG
$[MAm)c:]{ #define new DEBUG_NEW
MwSfuP #undef THIS_FILE
`VGw5o static char THIS_FILE[] = __FILE__;
Th\T$T`X$ #endif
[U^Cz{G #define MAX_KEY 100
g;AW #define CTRLBIT 0x04
b|kL*{; #define ALTBIT 0x02
`uusUw-Gf #define SHIFTBIT 0x01
i-4L{T\K #pragma data_seg("shareddata")
2MYez>D HHOOK hHook =NULL;
xpuTh"ED UINT nHookCount =0;
eA?|X| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
..'"kX:5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
eA
Fp<2g static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
3jJV5J'" static int KeyCount =0;
k6z]"[yu static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
\k=%G_W #pragma data_seg()
-}oH],C HINSTANCE hins;
]qq2VO<b void VerifyWindow();
\' A-
Lp BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
j%]sym //{{AFX_MSG_MAP(CHookApp)
Rh
]XJM // NOTE - the ClassWizard will add and remove mapping macros here.
Qu8=zI>t // DO NOT EDIT what you see in these blocks of generated code!
if\`M'3Xx //}}AFX_MSG_MAP
){,Mv:#+T END_MESSAGE_MAP()
*tR'K#:&g! ?/sn"~" CHookApp::CHookApp()
Rx&.,gzj[ {
LXrk5>9 // TODO: add construction code here,
})(robBkA // Place all significant initialization in InitInstance
bi@'m?XwJ }
a7u*d`3X= z}$.A9yn CHookApp theApp;
[GI2%uA0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!a!4^zqp {
{dE(.Z?]!# BOOL bProcessed=FALSE;
PGYx]r if(HC_ACTION==nCode)
pTTM(Hrx {
$X\2h+ Os if((lParam&0xc0000000)==0xc0000000){// Key up
:h3U^ switch(wParam)
{o*$|4q4 {
*(]ZdB_2 case VK_MENU:
`}$bJCSF.n MaskBits&=~ALTBIT;
oGg<s3;UND break;
]EDCs?, case VK_CONTROL:
QpoC-4F MaskBits&=~CTRLBIT;
x6Gl|e[jv break;
Tl]yl$ case VK_SHIFT:
w6Mv%ZO_ MaskBits&=~SHIFTBIT;
#NL'r99D/o break;
G6x'Myg I default: //judge the key and send message
&l_}yf"v break;
.~rg#*]^ }
}K,3SO(: for(int index=0;index<MAX_KEY;index++){
9}fez)m:g0 if(hCallWnd[index]==NULL)
{:n1|_r4Z continue;
seP h%Sa_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6^BT32,' {
-G_3B(]` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
=9p3^:S bProcessed=TRUE;
4_'B oU4 }
m&(qr5>b }
v|]"uPxH? }
jt* B0'Sa else if((lParam&0xc000ffff)==1){ //Key down
q3K}2g switch(wParam)
mC(YO y {
Up_"qD6 case VK_MENU:
T;PLUjp} MaskBits|=ALTBIT;
A>FWvlLw'm break;
N
Mx:Jh-YN case VK_CONTROL:
NB.'>Sar MaskBits|=CTRLBIT;
#67 7,dn break;
%CgV:.,K case VK_SHIFT:
MTNC{:Q MaskBits|=SHIFTBIT;
%AWc`D
break;
mZM7 4!4X default: //judge the key and send message
,69547#o break;
Q+QD, }
:LdPqFXj for(int index=0;index<MAX_KEY;index++)
c"1Z,M;G {
&=:3/;c if(hCallWnd[index]==NULL)
ZYt <O continue;
&Ll&A@yU if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G)Y,*., {
uAoZ&8D6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
uNw9g<g:V[ bProcessed=TRUE;
HRu;*3+%>F }
0O]v| }
;, \!&o6 }
"oF)u1_? if(!bProcessed){
=1
S%E for(int index=0;index<MAX_KEY;index++){
J^<uo( if(hCallWnd[index]==NULL)
88?O4)c continue;
&rX#A@= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
C[#C/@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
[9MbNJt 8~ }
3Z#WAhfS: }
^7=7V0>,: }
'^$+G0jv return CallNextHookEx( hHook, nCode, wParam, lParam );
\.Op6ECV9 }
"{t]~urLd x5/&,&m`% BOOL InitHotkey()
/s=veiH {
p7r/`_'| if(hHook!=NULL){
tp&|*M3 nHookCount++;
cKoW5e|u return TRUE;
@tD (<*f+ }
5nsoWqnE8 else
>&7^yXS hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
kl9~obX
1 if(hHook!=NULL)
_./s[{ek nHookCount++;
`c-omNu return (hHook!=NULL);
'ShK7j$ }
O.xtY@'" BOOL UnInit()
%&V%=-O_7 {
n%4/@M if(nHookCount>1){
]H\tz@
& nHookCount--;
hv\Dz*XTs0 return TRUE;
Y|
ch ; }
<l5m\A BOOL unhooked = UnhookWindowsHookEx(hHook);
GCfVH?Vx if(unhooked==TRUE){
R-1MD nHookCount=0;
D&~%w! hHook=NULL;
IvI..#EzG }
\/V#,O return unhooked;
OIjSH~a. }
'V&Uh]> x',6VTz^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
r`h".=oD {
~<s^HP2U{ BOOL bAdded=FALSE;
urCTP.F for(int index=0;index<MAX_KEY;index++){
;ny 9q if(hCallWnd[index]==0){
B<,7!:.II hCallWnd[index]=hWnd;
kOq8zYU| HotKey[index]=cKey;
>s0![c oz HotKeyMask[index]=cMask;
i27)c)\BM bAdded=TRUE;
b`^Q ':^A KeyCount++;
:g^
mg-8 break;
WY!4^<|w" }
f#w
u~*c }
1KBGML-K3 return bAdded;
WjM7s]ZRv }
(+/d*4 NuD|%Ebs BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MxKTKBxQ {
]yZ%wU9! BOOL bRemoved=FALSE;
*)6\V}` for(int index=0;index<MAX_KEY;index++){
_:p-\Oo. if(hCallWnd[index]==hWnd){
J.M&Vj: if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
s;*
UP hCallWnd[index]=NULL;
uLPBl~Y
HotKey[index]=0;
5/7(>ivn HotKeyMask[index]=0;
mw;4/
/R bRemoved=TRUE;
0(:SEiz6s KeyCount--;
|5X[/Q*K`W break;
[ ;sTl~gC }
BOq9\g`5s }
IAq
o(Qm }
Y#~A":A return bRemoved;
a'dlAda }
a_?b< 8"ZS|^#
void VerifyWindow()
.5}Gt>4XM {
57gt"f for(int i=0;i<MAX_KEY;i++){
.Y^cs+-o if(hCallWnd
!=NULL){ c:>&YGmhu
if(!IsWindow(hCallWnd)){ iR88L&U>
hCallWnd=NULL; c%gL3kOT
HotKey=0; Qr4 D
HotKeyMask=0; bcpsjUiy#
KeyCount--; 83gWA>Odh
} 6o(IL-0]c
} NRp
} A>2 _I)
} NMf#0Nz-
g=@d!]Z~[
BOOL CHookApp::InitInstance() 1# z@D(
{ @|Yn~PwKs
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ka8Y+Gs
hins=AfxGetInstanceHandle(); voN~f>
InitHotkey(); LyWY\K a
return CWinApp::InitInstance(); [wnp]'+!
} #9!7-!4pW
: MjDcI~
int CHookApp::ExitInstance() {+E]c:{
{ JTm'fo[
VerifyWindow(); c"Vp5lo0
UnInit(); Ro"'f7(v.
return CWinApp::ExitInstance(); xdM'v{N#m
} LbRQjwc]W
HG?+b
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Fs%`W4/
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .SER,],P
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ C c:<F_UI
#if _MSC_VER > 1000 Sp:w _;{#
#pragma once {ilz[LM8(
#endif // _MSC_VER > 1000 <r t$~}
+qC[X~\
class CCaptureDlg : public CDialog ]S[?tn
{ 0F/[GZ<k
// Construction 3]mprX'
public: T]-MrnO
BOOL bTray; ~"SQwE|
BOOL bRegistered; 09jE7g @X}
BOOL RegisterHotkey(); LR>s2zu-
UCHAR cKey; U$& '> %#
UCHAR cMask; vIOGDI>
void DeleteIcon(); K.Y`/<
void AddIcon(); ,1N|lyV
UINT nCount; /o 'lGvw
void SaveBmp(); |vl~B|",
CCaptureDlg(CWnd* pParent = NULL); // standard constructor W.jXO"pN
// Dialog Data 62zu;p9m
//{{AFX_DATA(CCaptureDlg) 5:f!EMb
enum { IDD = IDD_CAPTURE_DIALOG }; L6{gwoZf3
CComboBox m_Key; f'@ L|&w
BOOL m_bControl; 2tpu v(H;
BOOL m_bAlt; C)EP;5k'!\
BOOL m_bShift; A`Y^qXFb`
CString m_Path; d!0rq4v7
CString m_Number; .7gh2K
//}}AFX_DATA Wtcib-
// ClassWizard generated virtual function overrides !W@mW
5J|
//{{AFX_VIRTUAL(CCaptureDlg) -8Mb~Hfl0
public: Ue
>]uZ|
virtual BOOL PreTranslateMessage(MSG* pMsg); DR}I+<*%aD
protected: _Tor9Tj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nM2<u[{gF
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q'Osw"
//}}AFX_VIRTUAL *?HGi>]\|
// Implementation 7)r]h?
protected: ~ a`[p\
HICON m_hIcon; dVEs^ZtI
// Generated message map functions eDZ8F^0
//{{AFX_MSG(CCaptureDlg) \?T9v
virtual BOOL OnInitDialog(); zHX\h[0f
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Fw\Z[nh
afx_msg void OnPaint(); ckA\{v
afx_msg HCURSOR OnQueryDragIcon(); iKJqMES
virtual void OnCancel(); rVNx2
afx_msg void OnAbout(); b2UDP W
afx_msg void OnBrowse(); k!0O[U
afx_msg void OnChange(); g}D)MlXRq
//}}AFX_MSG nco.j:
DECLARE_MESSAGE_MAP() hoqZb<:
}; `HXv_9
#endif PD0&ep1h7G
bN zb#P#hP
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D~ Y6%9
#include "stdafx.h" n*wQgC'vw
#include "Capture.h" ra T9
#include "CaptureDlg.h" BL16?&RK
#include <windowsx.h> 4F#H$`:[
#pragma comment(lib,"hook.lib") %(/E
`
#ifdef _DEBUG d,98W=7
#define new DEBUG_NEW ',0:/jSz
#undef THIS_FILE m.Zy$SDj(
static char THIS_FILE[] = __FILE__; T3{~f
#endif /h+ W L
#define IDM_SHELL WM_USER+1 \j`0f=z_
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <lf692.3
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $e7%>*?m
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {k_\1t(/
class CAboutDlg : public CDialog `K.C>68
{ U`qC.s(L
public: hFi gY\$m
CAboutDlg(); bt) C+|i
// Dialog Data U+x^!{[/
//{{AFX_DATA(CAboutDlg) %%s)D4sW
enum { IDD = IDD_ABOUTBOX }; 9efey? z
//}}AFX_DATA S9Yzvq!(
// ClassWizard generated virtual function overrides 3d6z_Yd:
//{{AFX_VIRTUAL(CAboutDlg) rC^5Z
protected: :kR>wX
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c#{lXS^
//}}AFX_VIRTUAL =6Ok4Z
// Implementation H}F
UgA;
protected: ^:{8z;w!(
//{{AFX_MSG(CAboutDlg) xX%ppD7
//}}AFX_MSG vF$(
Y/
DECLARE_MESSAGE_MAP() N<:c*X
}; cj>UxU][eS
72OqXa*
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rwLKY.J]
{ z!3=.D
//{{AFX_DATA_INIT(CAboutDlg) Qy" Jt ]O
//}}AFX_DATA_INIT &S{r;N5u
}
,XEIg
3)EJws!
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s`bGW1#io
{ 6~%><C
CDialog::DoDataExchange(pDX); ?;CIS$$r
//{{AFX_DATA_MAP(CAboutDlg) TUnAsE/J&
//}}AFX_DATA_MAP 'cpm 4mT
} &>Ve4!i
q
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \
T#|<=
//{{AFX_MSG_MAP(CAboutDlg) K`Kv .4
// No message handlers .8|wc
//}}AFX_MSG_MAP 6
H P66B
END_MESSAGE_MAP() D;0>-
+s}&'V^
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) q!:dZES
: CDialog(CCaptureDlg::IDD, pParent) [n[dr@J7v
{ R BHDfm'~7
//{{AFX_DATA_INIT(CCaptureDlg) *0>`XK$mWo
m_bControl = FALSE; MT~^wI0a
m_bAlt = FALSE; ]!{S2x&"
m_bShift = FALSE; k5Cy/gR
m_Path = _T("c:\\"); D5c
8sB
m_Number = _T("0 picture captured."); u @Ze@N%
nCount=0; =l43RawAmu
bRegistered=FALSE; W9%v#;2
bTray=FALSE; A,_O=hA2I
//}}AFX_DATA_INIT 9-T<gYl
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >XgJo7u
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e
n~m)r3&
} Sxq@W8W
ck{S
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }?,?2U,8:
{ 1- s(v)cxh
CDialog::DoDataExchange(pDX); .b]sQ'
//{{AFX_DATA_MAP(CCaptureDlg) (SRY(q
DDX_Control(pDX, IDC_KEY, m_Key); ~6i'V?>
DDX_Check(pDX, IDC_CONTROL, m_bControl); g9" wX?*
DDX_Check(pDX, IDC_ALT, m_bAlt); l%EvXdZuOy
DDX_Check(pDX, IDC_SHIFT, m_bShift); AaYH(2m-
DDX_Text(pDX, IDC_PATH, m_Path); !ddyJJ^a
DDX_Text(pDX, IDC_NUMBER, m_Number); Q[#}Oh6$
//}}AFX_DATA_MAP ?0t^7HMP
} ?2&= +QaT
dHIk3j-!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Q)0KYKD+@
//{{AFX_MSG_MAP(CCaptureDlg) e El)wZ,A
ON_WM_SYSCOMMAND() $,~Ily7w
ON_WM_PAINT() jvB[bS`<H
ON_WM_QUERYDRAGICON() U)8yd,qG[%
ON_BN_CLICKED(ID_ABOUT, OnAbout) .m]}Ba}J$
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) pZ>yBY?R8>
ON_BN_CLICKED(ID_CHANGE, OnChange) [o<hQ`&
//}}AFX_MSG_MAP v>wN
O
END_MESSAGE_MAP() @??3d9I
ar<8wq<4G
BOOL CCaptureDlg::OnInitDialog() CK n2ZL
{ _dm0*T ?
CDialog::OnInitDialog(); &qS%~h%2
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u$R5Q{H_
ASSERT(IDM_ABOUTBOX < 0xF000); BjfVNF;hk:
CMenu* pSysMenu = GetSystemMenu(FALSE); I/njyV)H
if (pSysMenu != NULL) E\!X$
{ \~*<[.8~
CString strAboutMenu; "M5
strAboutMenu.LoadString(IDS_ABOUTBOX); D:Q#%wJ
if (!strAboutMenu.IsEmpty()) 8Ij<t{Lps
{ QZ&(e2z
pSysMenu->AppendMenu(MF_SEPARATOR); [cnuK
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o>8~rtl
} <Ja&z M
} 1+Gq<]@G
SetIcon(m_hIcon, TRUE); // Set big icon T]wI)
SetIcon(m_hIcon, FALSE); // Set small icon 1M&Lb.J6
m_Key.SetCurSel(0); >Y08/OAI.2
RegisterHotkey(); jlP*RX
CMenu* pMenu=GetSystemMenu(FALSE); Sh!c]r>\Q
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); L4Jm8sy{
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); l48$8Mgrr
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'UsR/h5T
return TRUE; // return TRUE unless you set the focus to a control `TJhH<z"%
} ^nPy(Q0
O(W"QY
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /.0K#J:
{ i-wRwl4aEF
if ((nID & 0xFFF0) == IDM_ABOUTBOX) |,,#DSe
{ gttsxOgktH
CAboutDlg dlgAbout; h,Hr0^?
dlgAbout.DoModal(); :o!Kz`J
} X0
|U?Ib?
else Acw`ytV
{ u9@B&
CDialog::OnSysCommand(nID, lParam); {*O%A
} 0FcDO5ia
} -]0:FKW
CBd%}il
void CCaptureDlg::OnPaint() bBs{PI2(p1
{ <CVX[R]U
if (IsIconic()) Nx.9)MjI
{ .rk5u4yK
CPaintDC dc(this); // device context for painting x 4v:67_^
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @ !")shc
// Center icon in client rectangle 4JK6<Pk
int cxIcon = GetSystemMetrics(SM_CXICON); nCi
]6;Y
int cyIcon = GetSystemMetrics(SM_CYICON); W5Z-s.o
CRect rect; n'mrLZw
GetClientRect(&rect); SEI0G_wk$
int x = (rect.Width() - cxIcon + 1) / 2; fsjLD|?|:
int y = (rect.Height() - cyIcon + 1) / 2; i[KXkjr
// Draw the icon 9 wR D=a
dc.DrawIcon(x, y, m_hIcon); z|3v~,
} @]n8*n
else S} UYkns*
{ 1!^BcrG.
CDialog::OnPaint();
#tKks:eL
} :'bZ:J>f
} Q$U.vF7BnP
}BM`4/
HCURSOR CCaptureDlg::OnQueryDragIcon() VvW4!1Dl
{ \YzKEYx+
return (HCURSOR) m_hIcon; : 2%eh
} :(XyiF<Ud
TQO|C?
void CCaptureDlg::OnCancel() G@DNV3Cc
{ Mrk3r/
8w
if(bTray) [l^XqD D4
DeleteIcon();
{ 8 K
CDialog::OnCancel(); Z~SAlhT
} >Y4^<!\v
E}4{{{r
void CCaptureDlg::OnAbout() 9mHCms
{ /UunWZ u%
CAboutDlg dlg; ]@9W19=P!P
dlg.DoModal(); }'Ap@4
} B`QF;,3S
U=JK
void CCaptureDlg::OnBrowse() GImPPF
{ sP^:*B0
CString str;
Jy:*GW6
BROWSEINFO bi; ?M'CTz}<\
char name[MAX_PATH]; "*#f^/LS
ZeroMemory(&bi,sizeof(BROWSEINFO)); eWqS]cM#
bi.hwndOwner=GetSafeHwnd(); \{<ml n
bi.pszDisplayName=name; D-@6 hWh~
bi.lpszTitle="Select folder"; Ru`afjc
bi.ulFlags=BIF_RETURNONLYFSDIRS; 5*2hTM!
LPITEMIDLIST idl=SHBrowseForFolder(&bi); &]a(5
if(idl==NULL) 8US35t:M
return; Gs"lmX-{$j
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |rJN
str.ReleaseBuffer(); W2XWb<QSEV
m_Path=str; :a Cf@:']
if(str.GetAt(str.GetLength()-1)!='\\') 9K}DmS
m_Path+="\\"; 'E#L6,&
UpdateData(FALSE); H 2I
} !KXcg9e
kq=Htbv7
void CCaptureDlg::SaveBmp() t'Yd+FK
{ H$ nzyooh
CDC dc; f
] *w1
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Lfx a^0
CBitmap bm; e6'0g=Y#
int Width=GetSystemMetrics(SM_CXSCREEN); e;=R8i
int Height=GetSystemMetrics(SM_CYSCREEN); l1zPL3"u_^
bm.CreateCompatibleBitmap(&dc,Width,Height); *H/)S 5
CDC tdc; !Yo2P"
tdc.CreateCompatibleDC(&dc); _K?v^oM#
CBitmap*pOld=tdc.SelectObject(&bm); -ioO8D&!
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gAvNm[=wD2
tdc.SelectObject(pOld); P}AwE,&Q
BITMAP btm; prO&"t
>
bm.GetBitmap(&btm); )Mq4p'*A[
DWORD size=btm.bmWidthBytes*btm.bmHeight;
LT{g^g
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w$$pTk|&n
BITMAPINFOHEADER bih; "d/54PKWx
bih.biBitCount=btm.bmBitsPixel; T#rUbi>""
bih.biClrImportant=0; &O+S[~
bih.biClrUsed=0; Z]LP18m9kl
bih.biCompression=0; /b{@']
bih.biHeight=btm.bmHeight; #pRbRT9
bih.biPlanes=1; ~Fvz&dO
bih.biSize=sizeof(BITMAPINFOHEADER); H)TKk%`7
bih.biSizeImage=size; "=]'"'B:
bih.biWidth=btm.bmWidth;
fATnza
bih.biXPelsPerMeter=0; -d!84_d9
bih.biYPelsPerMeter=0; 6@0?~
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); IH*G7;
static int filecount=0; te;bn4~
CString name; {>9<H]cSP
name.Format("pict%04d.bmp",filecount++); w,6gnO
name=m_Path+name; S8;c0}-
BITMAPFILEHEADER bfh; qtVgjT2#H
bfh.bfReserved1=bfh.bfReserved2=0; 2|!jst
bfh.bfType=((WORD)('M'<< 8)|'B'); dn~k_J=p
bfh.bfSize=54+size; W"/,<xHuh
bfh.bfOffBits=54; #lFsgb
CFile bf;
1^hG}#6_
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D'g@B.fXd
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?jO<<@*2S
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c;b<z|}z
bf.WriteHuge(lpData,size); f~?5;f:E
bf.Close(); Yc[vH=gV}
nCount++; p&(z'd
} f
4K)Z
e
GlobalFreePtr(lpData); ]\ZJaU80I~
if(nCount==1) t:.X=/02
m_Number.Format("%d picture captured.",nCount); U>b.MIBX
else <!W9EM
m_Number.Format("%d pictures captured.",nCount);
fCb&$oRr!
UpdateData(FALSE); T;kh+i
} NSRY(#3
+;@R&Y
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ak}ke
{ j*VYUM@y1\
if(pMsg -> message == WM_KEYDOWN) &z\?A2Mw%
{ 0a?[@ -Sz
if(pMsg -> wParam == VK_ESCAPE) AA|G&&1y
return TRUE; 9Z2aFW9
if(pMsg -> wParam == VK_RETURN) =;8q`
return TRUE; H-&
ktQWK3
} xjDaA U,
return CDialog::PreTranslateMessage(pMsg); q/7T-"q/G
} L{f0r!d|
yF
XPY=EQ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t]t(/x#
{ ]R"n+LnI:=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <ihJp^kgQ
SaveBmp(); BW`Tw^j
return FALSE; p)7U%NMc(*
} Fvv/#V^R
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I*+*Wf
CMenu pop; oXwcil
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0ZAtBq.s
CMenu*pMenu=pop.GetSubMenu(0); \o?
pMenu->SetDefaultItem(ID_EXITICON); 0oyZlv*
CPoint pt; &~)1mnv.
GetCursorPos(&pt); pR:cn kVF
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S`spUq1o
if(id==ID_EXITICON) 8
=3#S'n
DeleteIcon();
o2y
#Yk
else if(id==ID_EXIT) SsL>K*t5
OnCancel(); r)w]~)8
return FALSE; ,-1taS
} }WNgKw
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]waCYrG<sY
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <ot%>\C
AddIcon(); :; 3y^!
return res; rYyEs
I#qo
} g3w-Le&T
s\
]Rgi>w
void CCaptureDlg::AddIcon() _l]rt
{ V+y:!t`
NOTIFYICONDATA data; }?d
l.=eq
data.cbSize=sizeof(NOTIFYICONDATA); 1z8AK"8
CString tip; y?s#pSX;N
tip.LoadString(IDS_ICONTIP); wdgC{WGl
data.hIcon=GetIcon(0); aj]%c_])(
data.hWnd=GetSafeHwnd(); 0 KWi<G1
strcpy(data.szTip,tip); y-7$HWn
data.uCallbackMessage=IDM_SHELL; KMkX0+Ao
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~o/e0
data.uID=98; J@9E20$
Shell_NotifyIcon(NIM_ADD,&data); 9TE-'R@
ShowWindow(SW_HIDE); FU(s jB
bTray=TRUE; #w]:<R^
} ZsDn`8
w W;!L=j
void CCaptureDlg::DeleteIcon() ,OO0*%
{ !7kca#,X
NOTIFYICONDATA data; N5GQ2V
data.cbSize=sizeof(NOTIFYICONDATA); -}<W|r
data.hWnd=GetSafeHwnd(); cW, 6MAQo
data.uID=98; R$40cW3`
Shell_NotifyIcon(NIM_DELETE,&data);
^pZ\:
ShowWindow(SW_SHOW); G0$,H(]~
SetForegroundWindow(); |FD-q.AV
ShowWindow(SW_SHOWNORMAL); !*|`-woE
bTray=FALSE; !TuMrA*
} Si%K|$?@
3Q(#2tL=
void CCaptureDlg::OnChange() rsvGf7C
{ -RnQ8Iuo
RegisterHotkey(); ~C],?X(zk
} 7b[vZNi_
:~]ha
BOOL CCaptureDlg::RegisterHotkey() ?)#}Nj<R
{ faaFmEC
UpdateData(); "(#]H;!W
UCHAR mask=0; v.I>B3bEg
UCHAR key=0; lo!_;`v=U
if(m_bControl) fDY#&EO: %
mask|=4;
^'c[HVJ
if(m_bAlt) hAp<$7
mask|=2; KGb3n;]
if(m_bShift) [L@ vC>G
mask|=1; H23-%+*J
key=Key_Table[m_Key.GetCurSel()]; -^LEGKN
if(bRegistered){ KC{HX?
DeleteHotkey(GetSafeHwnd(),cKey,cMask); }<kpvd+ps=
bRegistered=FALSE; m-No 8)2yA
} =h2zIcj
cMask=mask; "S@%d(lg
cKey=key; ~nG?>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U_c.Z{lC4
return bRegistered; ]`Y;4XR
} :X;'37o#q
K%A:W
四、小结 hK&/A+*
<$'OSN`!
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。