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:
58&{5YpS
?#m<\]S< 一、实现方法
rjL?eTU"s ZP6x 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:
zD2.Q%`IM a,~D+s;^ #pragma data_seg("shareddata")
sr+gD*@h HHOOK hHook =NULL; //钩子句柄
5BHOHw D{ UINT nHookCount =0; //挂接的程序数目
dGsS<@G static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
3G%wZ,)C static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
gf3U#L}P static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
V+O0k: o static int KeyCount =0;
K2xH'v
O ( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
=0h|yjnL/ #pragma data_seg()
0aC2 Pym^ Y:%m;b$] 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
drENkS=, |,;twj[?4 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
b+IOh| i)7n c BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
]Y4q'KH cKey,UCHAR cMask)
,$h(fM8GC {
=!(*5\IM BOOL bAdded=FALSE;
X_u@D;$ for(int index=0;index<MAX_KEY;index++){
ut4r~~Ar if(hCallWnd[index]==0){
v._Egk0 hCallWnd[index]=hWnd;
L/q]QgCoA HotKey[index]=cKey;
]bTzbu@ HotKeyMask[index]=cMask;
j9URl$T: bAdded=TRUE;
m']9Q3- KeyCount++;
EWb(uWC8h break;
BFMS*t` }
5[,+\ }
cX%: return bAdded;
(@)2PO/ }
%1\v7Xw{9 //删除热键
D[89*@v BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-,QKTxwo> {
e^k!vk-SLF BOOL bRemoved=FALSE;
;Y'8:ncDn for(int index=0;index<MAX_KEY;index++){
nAo8uWG if(hCallWnd[index]==hWnd){
d"B@c;dD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
J}Qs"+x hCallWnd[index]=NULL;
]8$#qDS@ HotKey[index]=0;
rH$eB/#F HotKeyMask[index]=0;
|*^8~u3J" bRemoved=TRUE;
uW}Hvj;0a* KeyCount--;
URYZV8=B~ break;
=U4f}W; }
&|Lh38s@$# }
#puQi }
\G$QNUU return bRemoved;
@[MO,J&h }
kS B +
a-wv C-llq`(d DLL中的钩子函数如下:
7hB#x]oQo 59{;VY81 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
X"h%tsuw {
-7>^
rR V BOOL bProcessed=FALSE;
{TyCj?3 B if(HC_ACTION==nCode)
1.'(nKoq {
|DN^NhtE if((lParam&0xc0000000)==0xc0000000){// 有键松开
AL>c:K)qO switch(wParam)
R'6@n#: {
j4;Du>obQ case VK_MENU:
i@P 9EU MaskBits&=~ALTBIT;
<7=&DpjI7F break;
U/ ?F:QD4 case VK_CONTROL:
O(VxMO
MaskBits&=~CTRLBIT;
tT;8r8@ break;
gjW\
XY case VK_SHIFT:
,*/Pg52? MaskBits&=~SHIFTBIT;
"\}b!gl$8 break;
Q_ctX|. default: //judge the key and send message
$hh+0hs break;
8h2D+1,PZC }
%'N$lF"] for(int index=0;index<MAX_KEY;index++){
!*&4< _ if(hCallWnd[index]==NULL)
,-@xq.D continue;
807al^s
x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bqSMDK {
JXH",""bq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
glv ;C/l bProcessed=TRUE;
}@d>, 1DU }
pe|X@o }
N83!C=X' }
l+%Fl=Q2em else if((lParam&0xc000ffff)==1){ //有键按下
4~!Eje! switch(wParam)
-*?p F_*w {
/K7Bae5h case VK_MENU:
HLVQ7 MaskBits|=ALTBIT;
jDR')ascn break;
FJ{=2]x| case VK_CONTROL:
jz*0`9&_ MaskBits|=CTRLBIT;
d$w(-tV42 break;
~i%-WX case VK_SHIFT:
1\/{#c MaskBits|=SHIFTBIT;
z.
'Fv7 break;
$; ?c?n+ default: //judge the key and send message
w4UD/zO break;
>w9sE8i }
;_}~%-_
~ for(int index=0;index<MAX_KEY;index++){
KYp[Gs if(hCallWnd[index]==NULL)
iQqqs`K continue;
iC\%_5/_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
alFNSRY {
le.anJAr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
j !`B'{cH bProcessed=TRUE;
xA92C }
H( vx/q }
/0(%(2jIWl }
*ot>WVB if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
@K\o4\ for(int index=0;index<MAX_KEY;index++){
sm0fAL if(hCallWnd[index]==NULL)
E>E*ZZuhj continue;
H<g 1m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/jM_mrpz SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
i0>]CJG //lParam的意义可看MSDN中WM_KEYDOWN部分
!$_~x
8K1- }
>z(wf>2J }
'r\ 4}Ik }
%,0%NjK return CallNextHookEx( hHook, nCode, wParam, lParam );
OVZP x%a }
S#tY@h@XV 6ZcXS 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:
@OzMiN Hfh!l2P BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
fN@{y+6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
pe.Ml7o" >%u@R3PH] 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:
AotCX7T2T #.H}r6jqs LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
X3<K 1/< {
P;73Hr[E# if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
\8{\;L C {
1c$vLo832 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
J/ vK6cO\ SaveBmp();
A{N\) return FALSE;
eNbpwne }
2VA!&`I …… //其它处理及默认处理
1fH<VgF` }
sef]>q /N6}*0Ru J? .F\`N) 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。
Zyu/|Og (!3;X"l 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。
Hkege5{ ##cnFQCB 二、编程步骤
]W/>Ldv 9gy(IRGq/ 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";
le8 #Z}p L0L2Ns 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
M/pMs 6 a7#?h%wf 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;
eklgLU-+fW ]n;1x1' 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;
vQ1 v#Z QTH7grB2v 5、 添加代码,编译运行程序。
|0g{"}% 2z\e\I 三、程序代码
MG{l~|\x) rQb7?O@- ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
-R
b{^/ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
_[t8rl #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
eVJ^\z:4 #if _MSC_VER > 1000
@ }&_Dvf #pragma once
ml0*1Dw #endif // _MSC_VER > 1000
Z.1>
kZ #ifndef __AFXWIN_H__
du_4eB #error include 'stdafx.h' before including this file for PCH
G69GoT #endif
XogVpkA #include "resource.h" // main symbols
rzUlO5?R= class CHookApp : public CWinApp
P6\6?am {
3TS_-l public:
!Ms[eB CHookApp();
yCP4r6X0 // Overrides
pr&=n;_ n // ClassWizard generated virtual function overrides
/<{: I \< //{{AFX_VIRTUAL(CHookApp)
D d,2;#_ public:
[M%._u, virtual BOOL InitInstance();
QI_4* virtual int ExitInstance();
9t$]X>} //}}AFX_VIRTUAL
%%JMb=!%2 //{{AFX_MSG(CHookApp)
R#W&ery // NOTE - the ClassWizard will add and remove member functions here.
~Lz%.a;o // DO NOT EDIT what you see in these blocks of generated code !
/?*]lH. //}}AFX_MSG
$n!K6fkX% DECLARE_MESSAGE_MAP()
cBXWfv4 };
G8J*Wnwu[K LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
%JyXbv3m, BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
{<=#*qx[Y! BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/>44]A< BOOL InitHotkey();
,|h)bg7. BOOL UnInit();
(Un_!) #endif
,r8Tbk]m F(,UA+$A //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Iz@)!3h #include "stdafx.h"
Fmr}o(q1 #include "hook.h"
yN6>VD{F #include <windowsx.h>
Vzl^Ka' #ifdef _DEBUG
!.TLW #define new DEBUG_NEW
:O= \<t #undef THIS_FILE
wW>fVPr static char THIS_FILE[] = __FILE__;
@~ETj26U' #endif
2%u;$pj #define MAX_KEY 100
V[nQQxWp= #define CTRLBIT 0x04
T~4N+fK #define ALTBIT 0x02
Qk1xUE #define SHIFTBIT 0x01
OLC{iD# #pragma data_seg("shareddata")
&ldBv_ HHOOK hHook =NULL;
t2BL(yB UINT nHookCount =0;
,|kDsR! static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
6#@ f'~s static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
om h{0jA0 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
7U|mu~$.! static int KeyCount =0;
0#cy=*E static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
,yd= e}lQx #pragma data_seg()
/JkC+7H4 HINSTANCE hins;
qIMA6u/ void VerifyWindow();
De&6 9 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
O1'm@
q) //{{AFX_MSG_MAP(CHookApp)
@]aOyb@ // NOTE - the ClassWizard will add and remove mapping macros here.
"vZ!vt#'Y // DO NOT EDIT what you see in these blocks of generated code!
Qnd5X`jF# //}}AFX_MSG_MAP
RsJ6OFcWV END_MESSAGE_MAP()
'T<iHV& }Gyqq6Aeb CHookApp::CHookApp()
VVP:w%yW {
h vka{LD // TODO: add construction code here,
sarq`%zrk // Place all significant initialization in InitInstance
',^+bgs5 }
Uyx!E4pl( ~@.%m"<. CHookApp theApp;
3&&9_`r&_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
d;mx<i=/ {
A][fLlpr BOOL bProcessed=FALSE;
?';OD3- if(HC_ACTION==nCode)
)Gw~XtB2 {
mtz#}qD66 if((lParam&0xc0000000)==0xc0000000){// Key up
PjA6Ji;Hu switch(wParam)
-#!x|ne {
I/gjenUK case VK_MENU:
-!W<DJ* MaskBits&=~ALTBIT;
9}a_:hAy/ break;
3I\n_V< case VK_CONTROL:
7\FXz'hA MaskBits&=~CTRLBIT;
V-'K6mn; break;
fjk\L\1 case VK_SHIFT:
.
\ MaskBits&=~SHIFTBIT;
10!wqyj& break;
X4l@woh%
default: //judge the key and send message
^j#rZ;uc
break;
YQJ==C1 }
yeDsJ/L for(int index=0;index<MAX_KEY;index++){
^V$Ajt if(hCallWnd[index]==NULL)
ivDGZI9 continue;
.
8N.l^0, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<Rh6r}f {
)q7UxzE+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
)XcOl7XLN bProcessed=TRUE;
AL#4_]m' }
Vq;dJ%sY }
(jU6GJRP }
]BR,M4 else if((lParam&0xc000ffff)==1){ //Key down
J+d1&Tw& switch(wParam)
ZaNQpH. {
0d8%T<=J case VK_MENU:
b[V^86X^ MaskBits|=ALTBIT;
~/.7l8) break;
g1t0l%_7^ case VK_CONTROL:
3U_2! zF3_ MaskBits|=CTRLBIT;
&gzCteS break;
RV@*c4KvO+ case VK_SHIFT:
>4t+:Ut: MaskBits|=SHIFTBIT;
R<OI1,..r break;
r@ZJ{4\Q default: //judge the key and send message
^Q+g({
break;
yX~v-N!X }
pAT7)Ch
for(int index=0;index<MAX_KEY;index++)
dAy?EO0\7 {
h@a+NE8 if(hCallWnd[index]==NULL)
b0oMs=uBn continue;
fW?o@vlO if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lok= {
S~|T4q( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`r?7oxN bProcessed=TRUE;
i':C)7 }
&RfC"lc }
`]%|f }
/~3r;M if(!bProcessed){
r?/'!!4 for(int index=0;index<MAX_KEY;index++){
'q`^3&E if(hCallWnd[index]==NULL)
fk&8]tK4 continue;
<i,U )Tt^C if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#'y#"cmQ. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
rW=Z>1 }
wp&=$Aa)' }
A,a.8!*}vd }
T:; 2 return CallNextHookEx( hHook, nCode, wParam, lParam );
,N)/w1?I }
@H=:)*; :5{wf Am BOOL InitHotkey()
DP|D\+YyYA {
pS:4CNI{ if(hHook!=NULL){
o,)?!{k} nHookCount++;
<*qnY7c&N; return TRUE;
]?(-[ }
B8}Nvz
/ else
ajEjZ6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
@<elq'2 if(hHook!=NULL)
Fx2bwut.K nHookCount++;
yPal<c return (hHook!=NULL);
9?SZNL['V }
U[ 0=L`0e BOOL UnInit()
va0{>Dc+ {
sr{a(4*\ if(nHookCount>1){
6}!#;@D~ nHookCount--;
Eqj_m|@ return TRUE;
,=[?yJy }
`9BROZnq BOOL unhooked = UnhookWindowsHookEx(hHook);
o6uJyCO if(unhooked==TRUE){
9@Jtaq>jf nHookCount=0;
Hhcpp7cr' hHook=NULL;
BW$"`T@c6~ }
(^Y~/ return unhooked;
i uF*.hc,% }
r/u A.Aou^ y#3j`. $3p BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GU( _ {
`)_dS&_\ BOOL bAdded=FALSE;
r2,.abo for(int index=0;index<MAX_KEY;index++){
N(Fp0 if(hCallWnd[index]==0){
Tu).K.p: hCallWnd[index]=hWnd;
AHX St HotKey[index]=cKey;
LhA/xf HotKeyMask[index]=cMask;
zN^n]N_? bAdded=TRUE;
Gz,i~XX KeyCount++;
!1$])VQWI break;
4b98KsYg }
$\X[@E S0 }
sT}.v* return bAdded;
rustMs2p }
}&wUr>= ^c9t'V`IWQ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CEX"D` {
t.xxSU5~% BOOL bRemoved=FALSE;
EK6:~ for(int index=0;index<MAX_KEY;index++){
Bu#VMkchJ if(hCallWnd[index]==hWnd){
wAf\|{Vn if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
qVH1}9_ hCallWnd[index]=NULL;
.\)U@L~ HotKey[index]=0;
&m-PC(W+ HotKeyMask[index]=0;
[OC5l> bRemoved=TRUE;
E2R&[Q"% KeyCount--;
6ZP(E^. break;
LG9+y }
l1BtI_7p }
W\d{a(* }
=THpdtL return bRemoved;
fSK]|"c }
,(EO'T[ `p2+&&]S void VerifyWindow()
\hDlTp} {
O$_)G\\\m for(int i=0;i<MAX_KEY;i++){
]>=}*= if(hCallWnd
!=NULL){ /|C*
if(!IsWindow(hCallWnd)){ -zOdU}91Ao
hCallWnd=NULL; bk;?9%TW
HotKey=0; }fb#G<3
HotKeyMask=0; f4 P8Oz
KeyCount--;
TQpf Q
} '
aq!^!z
} $u]jy0X<Y;
} C~2F9Pg
} haK3?A,"_A
gG<~-8uQ
BOOL CHookApp::InitInstance() M2OIBH4!
{ _>(^tCo
AFX_MANAGE_STATE(AfxGetStaticModuleState()); =;Rtdy/Yn%
hins=AfxGetInstanceHandle(); QbkLdM,S*
InitHotkey(); {.C!i{|
return CWinApp::InitInstance(); [q?<Qe
} ,|y:" s
WrQD X3
int CHookApp::ExitInstance() hI]Hp3S
{ B-ngn{Yc
VerifyWindow(); .HS"}A T
UnInit(); BJ$9vbhZN
return CWinApp::ExitInstance(); _(%d(E2?
} <D<4BnZ(
"p_J8
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $rv8K j+
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [uC]*G]
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I&}L*Z?`
#if _MSC_VER > 1000 e!N:,`R
5
#pragma once BTGvN%
#endif // _MSC_VER > 1000 RYQ<Zr$!
#@YPic"n7`
class CCaptureDlg : public CDialog %b&".mN
{ p>RNPrT
// Construction Ta
?_5
public: }vxw*8d?
BOOL bTray; ~zCEpU|@N
BOOL bRegistered; iU$] {c2;A
BOOL RegisterHotkey(); {.?ZHy\Rk
UCHAR cKey; *H"B _3<n
UCHAR cMask; -]/I73!b
void DeleteIcon(); #lmB
AL~3
void AddIcon(); >`Y.+4mE
UINT nCount; ^Cu\VV
void SaveBmp(); Aw$x;3y
CCaptureDlg(CWnd* pParent = NULL); // standard constructor zi|+HM
// Dialog Data j9eTCJqB
//{{AFX_DATA(CCaptureDlg) -+(jq>t
enum { IDD = IDD_CAPTURE_DIALOG }; [#-b8Cu
CComboBox m_Key; @L<*9sLWh
BOOL m_bControl; 7Ri46Tkt
BOOL m_bAlt; v- T$:cL
BOOL m_bShift; ;X?}x%$
CString m_Path; 1O/+8yw
CString m_Number; R;s?$;I
//}}AFX_DATA &]"
// ClassWizard generated virtual function overrides @mOH"acGn?
//{{AFX_VIRTUAL(CCaptureDlg) %HGD;_bhI
public: (D#B_`;-
virtual BOOL PreTranslateMessage(MSG* pMsg); ii[F]sR\
protected: qkt0**\
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =
s>T;|
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Vq2y4D?
//}}AFX_VIRTUAL HG^B#yX
// Implementation .{ocV#{s
protected: jF ^~p9z
HICON m_hIcon; kpJ@M%46
// Generated message map functions UtPLI al
//{{AFX_MSG(CCaptureDlg) !}YAdZJ
virtual BOOL OnInitDialog(); %`>nS@1zp
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N4^-`
afx_msg void OnPaint(); m? eiIrMW
afx_msg HCURSOR OnQueryDragIcon(); q$I;dOCJ,
virtual void OnCancel(); 5b*M*e&=C
afx_msg void OnAbout(); K{&mI/;
afx_msg void OnBrowse(); wW7eT~w
afx_msg void OnChange(); f!\lg
//}}AFX_MSG `|6'9
DECLARE_MESSAGE_MAP() qaY1xPWz"
}; veMH
#endif /qMG=Z
Z,sv9{4r
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -}nxJH )
#include "stdafx.h" VCY\be
#include "Capture.h" 13 =A
#include "CaptureDlg.h" [$qyF|/K`n
#include <windowsx.h> v25R_""~
#pragma comment(lib,"hook.lib") 4" Cb/y3
#ifdef _DEBUG ;nep5!s;<
#define new DEBUG_NEW "fG8?)d;
#undef THIS_FILE n!YKz"$
static char THIS_FILE[] = __FILE__; hBS.a6u1'd
#endif 'Q|M'5'
#define IDM_SHELL WM_USER+1 [b6R%
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1pt%Kw*@j
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _wTOmz%|R
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; sPr~=,F
class CAboutDlg : public CDialog m_.>C
{ PH1p2Je
public: g<l1zo`_
CAboutDlg(); JSkLEa~<
// Dialog Data K~c=M",mW
//{{AFX_DATA(CAboutDlg) O{QA
enum { IDD = IDD_ABOUTBOX }; d;zai]]
//}}AFX_DATA Wr<j!>J6Ki
// ClassWizard generated virtual function overrides G/b^|;41
//{{AFX_VIRTUAL(CAboutDlg) wG~`[>y (
protected: 3vuivU.3
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "3Uv]F
//}}AFX_VIRTUAL LCZ\4g05
// Implementation &|Bc7+/P
protected: A#Iyb){Y
//{{AFX_MSG(CAboutDlg) [BWNRC1
//}}AFX_MSG -wp|RD,}(
DECLARE_MESSAGE_MAP() Cbg!:Cws
}; FKIw!m ~
f-bVKHt
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) h}*/Ge]aM
{ /I1h2E
//{{AFX_DATA_INIT(CAboutDlg) 0rOfrTNOz%
//}}AFX_DATA_INIT )k\H@Dy%$
} +1uF !G&l
XlV0* }S
void CAboutDlg::DoDataExchange(CDataExchange* pDX) U7K,AflK?M
{ m+b):
CDialog::DoDataExchange(pDX); ?%O(mC]u&
//{{AFX_DATA_MAP(CAboutDlg) syWG'(>
//}}AFX_DATA_MAP ~k!j+>yT
} 4,sJE2"[9
Xnz3p"
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6hlc1?
//{{AFX_MSG_MAP(CAboutDlg) oI=fx Sjd
// No message handlers ukIQr/k
//}}AFX_MSG_MAP q@Zn|NR
END_MESSAGE_MAP() 9f2UgNqe9
G~Hzec{#tg
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eFaO7mz5V%
: CDialog(CCaptureDlg::IDD, pParent) SO IHePmwK
{ 1M}5>V{
//{{AFX_DATA_INIT(CCaptureDlg) /.3}aj;6
m_bControl = FALSE; RZHd9v$
m_bAlt = FALSE; 2[Z,J%:0
m_bShift = FALSE; N!ls j
\-
m_Path = _T("c:\\"); !
='rc-E
m_Number = _T("0 picture captured."); 'JCZ]pZ
nCount=0; VXYK?Qc'
bRegistered=FALSE; uEktQ_u[
bTray=FALSE; +@94;me
//}}AFX_DATA_INIT 6%t1b M
a
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6HZ` .o:f
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *G{^|z
} ePr&!Tz#
C"!gZ8*\!9
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o9JMH.G
{ v*;-yG&
CDialog::DoDataExchange(pDX); ex::m&
//{{AFX_DATA_MAP(CCaptureDlg) {_`^R>"\&w
DDX_Control(pDX, IDC_KEY, m_Key); 23c 8
DDX_Check(pDX, IDC_CONTROL, m_bControl); M[mF8Zf
DDX_Check(pDX, IDC_ALT, m_bAlt); %e-7ubW
DDX_Check(pDX, IDC_SHIFT, m_bShift); zbk q
DDX_Text(pDX, IDC_PATH, m_Path); ^5H >pat
DDX_Text(pDX, IDC_NUMBER, m_Number); <g1hxfKx5
//}}AFX_DATA_MAP <R''oEf9
} F$ #U5}Q
1`(tf6op
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vd[}Gd
//{{AFX_MSG_MAP(CCaptureDlg) ]~aF2LJ_q
ON_WM_SYSCOMMAND() 8vMG5#U[
ON_WM_PAINT() <J`0mVOX
ON_WM_QUERYDRAGICON() g'H$R~ag
ON_BN_CLICKED(ID_ABOUT, OnAbout) G_0(
|%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) n;@bLJ$W
ON_BN_CLICKED(ID_CHANGE, OnChange) fDT%!
//}}AFX_MSG_MAP z2g3FUTX)b
END_MESSAGE_MAP() VKq=7^W
:pGaFWkvO
BOOL CCaptureDlg::OnInitDialog() Ove<mFI\
{ )6q,>whI]
CDialog::OnInitDialog(); #
WAZ9,t
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YE|SKx@
ASSERT(IDM_ABOUTBOX < 0xF000); Tw""}|] g
CMenu* pSysMenu = GetSystemMenu(FALSE); G&i!Hs
if (pSysMenu != NULL) Fh`~`eog
{ /W>iJfx
CString strAboutMenu; $oj:e?8N
strAboutMenu.LoadString(IDS_ABOUTBOX); PmKeF}
if (!strAboutMenu.IsEmpty()) %>~sJ0
{ 4kBaB
pSysMenu->AppendMenu(MF_SEPARATOR); i+p^ ^t\
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,cB\
} +z9Q-d%O
} Q4+gAS9
SetIcon(m_hIcon, TRUE); // Set big icon d/BM&r
SetIcon(m_hIcon, FALSE); // Set small icon LcUh;=r}&
m_Key.SetCurSel(0); I1pWaQ0
RegisterHotkey(); aMtsmL?=
CMenu* pMenu=GetSystemMenu(FALSE); ~$)2s7
O
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Pb1*\+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VFRi1\G
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "JlpU-8[0@
return TRUE; // return TRUE unless you set the focus to a control sE:M@`2L
} `%+Wz0(K
g/P+ZXJ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -(
{ ;_rF;9z9
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,1 [q^-9
{ '}fzX2Q#
CAboutDlg dlgAbout; )n2 re?S
dlgAbout.DoModal(); v6>_ j
L
} | # 47O
else \QYFAa
{ 5*Y^\N
CDialog::OnSysCommand(nID, lParam); j@SQ~AS
} $npT[~U5
} Dp)=0<$y
sg$rzT-S4
void CCaptureDlg::OnPaint() Tk5W'p|6f
{ _F$aUtb%O
if (IsIconic()) Dpl A?
{ .P[ _<8
CPaintDC dc(this); // device context for painting thifRd$4
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :_g$.h%%
// Center icon in client rectangle 4lKq{X5<
int cxIcon = GetSystemMetrics(SM_CXICON); ?QFpv#4
int cyIcon = GetSystemMetrics(SM_CYICON); wVEm:/;z&
CRect rect; AaWs}M
GetClientRect(&rect); ioYGZ%RG#
int x = (rect.Width() - cxIcon + 1) / 2; [_1G@S6Ex
int y = (rect.Height() - cyIcon + 1) / 2; PE5R7)~A
// Draw the icon +RyjF~[e
dc.DrawIcon(x, y, m_hIcon); VXR>]HUF
} "#{4d),r
else z^#;~I @M
{ (O.d>
CDialog::OnPaint(); v7iuL6jl
} &e#~<Wm82
} whi`Z:~
D/vOs[X
o,
HCURSOR CCaptureDlg::OnQueryDragIcon() ]x(e&fyHB
{
|8My42yf
return (HCURSOR) m_hIcon; D ,o}el
} 5hQE4/hH
TFkZp e;
void CCaptureDlg::OnCancel() A
Q'J9
{ (9Ux{@$o[
if(bTray) u>kN1k Q8
DeleteIcon(); YoBPLS`K
CDialog::OnCancel(); VQ7*Z5[1
} +yk24
`>
g*03{l#P
void CCaptureDlg::OnAbout() inh=WUEW
{ apg=-^L'
CAboutDlg dlg; HY&aV2|A1
dlg.DoModal(); 2O.i\cH
} E5I"%9X0H
=a@j=
void CCaptureDlg::OnBrowse() x{n`^;Y1
{ l5Gq|!2yxD
CString str; P<X\%_Iat
BROWSEINFO bi; n1ly
y0%u
char name[MAX_PATH]; G9xmmc
ZeroMemory(&bi,sizeof(BROWSEINFO)); :6vm+5!
bi.hwndOwner=GetSafeHwnd(); 95A1:A^t
bi.pszDisplayName=name; Xq_5Qv
bi.lpszTitle="Select folder"; YjxF}VI~<
bi.ulFlags=BIF_RETURNONLYFSDIRS; GO`Ru 8
LPITEMIDLIST idl=SHBrowseForFolder(&bi); $\]&rZVi
if(idl==NULL) El.hu%#n*G
return; C8Qa$._
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2+QY hdw
str.ReleaseBuffer(); i rU 6D
m_Path=str; WvBc#s-
if(str.GetAt(str.GetLength()-1)!='\\') +nXK-g;)'
m_Path+="\\"; =&ks)MH-
UpdateData(FALSE); ;<Ar=?
} Jk7|{W\OA
{`LU+
void CCaptureDlg::SaveBmp() Sjvdirr
{ 1.D,W1s
CDC dc; y9q8i(E0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); LBM ^9W
CBitmap bm; :.Jf0
int Width=GetSystemMetrics(SM_CXSCREEN); +av@$}
int Height=GetSystemMetrics(SM_CYSCREEN); U+:m4a
bm.CreateCompatibleBitmap(&dc,Width,Height); _+K_5IO4
CDC tdc; >7I15U
tdc.CreateCompatibleDC(&dc); K{|p~B
CBitmap*pOld=tdc.SelectObject(&bm); 2R;}y7{
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @D{KdyW
tdc.SelectObject(pOld); PsnWWj?c
BITMAP btm; @k,z:~[C=
bm.GetBitmap(&btm); $8UUzk
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3Z5D)zuc
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); j27?w<
BITMAPINFOHEADER bih; `j,Yb]~s79
bih.biBitCount=btm.bmBitsPixel; x3 q]I 8q
bih.biClrImportant=0; ^@3sT,M,S
bih.biClrUsed=0; sz:g,}~h
bih.biCompression=0; fVF2-Rh=
bih.biHeight=btm.bmHeight; n>ULRgiT:o
bih.biPlanes=1; yeXx',]a
bih.biSize=sizeof(BITMAPINFOHEADER); A
mNW0.}
bih.biSizeImage=size; #gRM i)(F
bih.biWidth=btm.bmWidth; l_o@miG/
bih.biXPelsPerMeter=0; [DJ|`^eKD
bih.biYPelsPerMeter=0; -I8=T]_D
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K@I
D/]PF
static int filecount=0; g)#W>.Asd
CString name; (7*%K&x
name.Format("pict%04d.bmp",filecount++); iII=;:p
name=m_Path+name; )wC?T
BITMAPFILEHEADER bfh; Q.l}NtHwV
bfh.bfReserved1=bfh.bfReserved2=0; uJzG|$;
bfh.bfType=((WORD)('M'<< 8)|'B');
^
DaBz\
bfh.bfSize=54+size; ^hc!FD
bfh.bfOffBits=54; OGK}EI
CFile bf; c0,0`+2~
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pT=JP> nd^
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,}3
'I [
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W42iu"@
bf.WriteHuge(lpData,size); o /j*d3
bf.Close(); (;T^8mI2
nCount++; tSr8 zAV
} ?}wk.gt>
GlobalFreePtr(lpData); U'H$`$Ov
if(nCount==1) U{2BVqM
m_Number.Format("%d picture captured.",nCount); t{ xf:~B
else zk$FkbX
m_Number.Format("%d pictures captured.",nCount); OI|[roMK
UpdateData(FALSE); b$N2z
} K"|l@Q[
A)bWcB}U
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i3tg6o4C
{ |iak z|])
if(pMsg -> message == WM_KEYDOWN) Ag 9vU7
{ |2O]R s
if(pMsg -> wParam == VK_ESCAPE) 24
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return TRUE; u+Y\6~=+
if(pMsg -> wParam == VK_RETURN) %|auAq&w
return TRUE; tr<Nm6!
} Hx"ob_^'7
return CDialog::PreTranslateMessage(pMsg); Q-_N2W?
} CAfGH!l!
Sc\*W0m
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u(@$a4z
{ $ `ov4W
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zd2)M@
SaveBmp(); pmuvg6@h
return FALSE; 6a[}'/
} +O8%Hm
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ff]6aR/
UQ
CMenu pop; Vr]id
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8<X#f
!
CMenu*pMenu=pop.GetSubMenu(0); q
?|,O;?
pMenu->SetDefaultItem(ID_EXITICON); |cK*~
CPoint pt; vx>b^tJKC
GetCursorPos(&pt); Vc 1\i
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 00(on28b
if(id==ID_EXITICON) cr%"$1sY;
DeleteIcon(); gwLf '
else if(id==ID_EXIT) #eoome2Q
OnCancel(); Bo)3!wO8
return FALSE; Rw"sJ) /
} nCUg,;_=
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v\c>b:AofD
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) EAT"pxP
AddIcon(); N-G1h?e4
return res; `#rL*;\uV
} joFm]3$;
V3&RJ k=b
void CCaptureDlg::AddIcon() 2M.fLQ?
{ Kz~ps
5
NOTIFYICONDATA data; qraSRK5
data.cbSize=sizeof(NOTIFYICONDATA); gH$ Mr
CString tip; _GV:HOBi
tip.LoadString(IDS_ICONTIP); 6V$Avg\6\
data.hIcon=GetIcon(0); xcd#&
data.hWnd=GetSafeHwnd(); S=MEG+Ad
strcpy(data.szTip,tip); ?:vv50
data.uCallbackMessage=IDM_SHELL; yQU{zY
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .CL[_;}
data.uID=98; QA<
Rhv,
Shell_NotifyIcon(NIM_ADD,&data); Z/W:97M
ShowWindow(SW_HIDE); x3hB5p$q
bTray=TRUE; .!Oo|m`V@
} nL5cK:
CuFSeRe
void CCaptureDlg::DeleteIcon() U bXh,QEG*
{ {&cJDqz5=
NOTIFYICONDATA data; pV9IHs}
data.cbSize=sizeof(NOTIFYICONDATA); &q3"g*q
data.hWnd=GetSafeHwnd(); FEW14U'O
data.uID=98; DGRXd#
Shell_NotifyIcon(NIM_DELETE,&data); )B
T
ShowWindow(SW_SHOW); qB~rQPa
SetForegroundWindow(); ,kiv>{
ShowWindow(SW_SHOWNORMAL); y`VyQWW
bTray=FALSE; IoxgjUa
} I5`4Al
gR&Q3jlIV
void CCaptureDlg::OnChange() SzAJ2:qhl
{ ! +a. Ei
RegisterHotkey(); y=fx%~<>
8
} G/k2Pe{SL
vleS2-]|
BOOL CCaptureDlg::RegisterHotkey() Nkjza:f{
{ 6g2a[6G5
UpdateData(); S'k_olx7
UCHAR mask=0; qz+dmef
UCHAR key=0; H['N
if(m_bControl) Vy6qbC-Kt
mask|=4; wrc,b{{[iM
if(m_bAlt) y<?kzt
mask|=2; 0g
+7uGp:
if(m_bShift) sGi"rg#
mask|=1; S
^"y4-2
key=Key_Table[m_Key.GetCurSel()]; )SaGH3~*C
if(bRegistered){ ?ME6+Z\
DeleteHotkey(GetSafeHwnd(),cKey,cMask); {ME2ImD
bRegistered=FALSE; oL!EYbFD'Z
} 5-|:^hU9
cMask=mask; ,-$LmECg
cKey=key; ,g%0`SO
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D60aH!ft
return bRegistered; cm&nd'A't
} x/NfZ5e0X
O(#)m>A
四、小结 &T+atL `N
%D UH@j
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。