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:
8KMvAc
CxDcY 一、实现方法
CZ(`|;BC* k!3 cq) 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:
G;s"h%Xw98 NiA4JgM]v #pragma data_seg("shareddata")
:,
_!pe;H HHOOK hHook =NULL; //钩子句柄
TQc@lR! UINT nHookCount =0; //挂接的程序数目
xS8,W static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
_TUm$#@Y` static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
s bnjy"Z% static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
}pawIf4V static int KeyCount =0;
TSjIz5 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
g
jxS #pragma data_seg()
qTM%G- X>zlb$ 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。
H)>sTST( f%XJ;y\,9H 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:
W~ruN4q. 4h8*mMghs BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
bL`eiol6 cKey,UCHAR cMask)
? ?[g}> {
1nI^-aQ3 BOOL bAdded=FALSE;
I[D8""U for(int index=0;index<MAX_KEY;index++){
M0w/wt| if(hCallWnd[index]==0){
{C")#m-0 hCallWnd[index]=hWnd;
rN5tI.iC HotKey[index]=cKey;
q3h'l, HotKeyMask[index]=cMask;
4 1t)(+r bAdded=TRUE;
;>>C)c4V " KeyCount++;
9v?l break;
"9XfQ"P }
UyiJU~r1 }
aG{$Ic return bAdded;
u9Y3?j,oC }
]
fwZAU //删除热键
{(tHk_q BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ri)uq\E/# {
4W;S=#1 BOOL bRemoved=FALSE;
~OypE4./1 for(int index=0;index<MAX_KEY;index++){
>jTp6tu, if(hCallWnd[index]==hWnd){
<9eu1^g if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
zT#`qCbT'J hCallWnd[index]=NULL;
:]WqfR)# HotKey[index]=0;
Zu/<NC
( HotKeyMask[index]=0;
+Qj(B@i bRemoved=TRUE;
F)Oe9x\/ KeyCount--;
[6tSYUZs break;
%j+xgX/& }
:P+\p= }
:a0zT#u }
lAi2,bz" return bRemoved;
"G?Yrh }
d
6t:hn 9P WY52! gfg n68k DLL中的钩子函数如下:
cWLqU A''pS LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
:/N+;- 18 {
/*rhtrS) BOOL bProcessed=FALSE;
QHlU|dR)Ry if(HC_ACTION==nCode)
#hw>tA6 {
W?Ww2Lo%Y if((lParam&0xc0000000)==0xc0000000){// 有键松开
Vba.uKNjk switch(wParam)
(zcLx;N
{
M(Zc^P}N case VK_MENU:
I#rubAl MaskBits&=~ALTBIT;
_$s> c!t,# break;
IV `%V+
f case VK_CONTROL:
D(]E/k@;~ MaskBits&=~CTRLBIT;
ytAWOt}` break;
\6!W05[ Q case VK_SHIFT:
A1i!F?X MaskBits&=~SHIFTBIT;
DAO]uh{6 break;
%)(Cp-b! default: //judge the key and send message
3n;K!L%zMT break;
K8I$]M }
6'-As=iw for(int index=0;index<MAX_KEY;index++){
+.yT/y " if(hCallWnd[index]==NULL)
=E*Gb[r_7 continue;
Y.6SOu5$] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
u bW]-U=T {
xTz%nx SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
W!L+(!&H bProcessed=TRUE;
I]`-|Q E }
gVR@&bi7 }
v|';!p| }
qxOi>v0\H else if((lParam&0xc000ffff)==1){ //有键按下
gl%`qf6:O switch(wParam)
B&?sF" Y {
&[[K"aM1 case VK_MENU:
N.do " MaskBits|=ALTBIT;
j+IrqPKC^ break;
&qM[g9 case VK_CONTROL:
gABr@>Vv MaskBits|=CTRLBIT;
>SbK.Q@ei break;
)Kd%\PP case VK_SHIFT:
|CFRJN-J" MaskBits|=SHIFTBIT;
3G}AH E4 break;
5Wx~ZQZ default: //judge the key and send message
aHzHvl break;
wq!iV | }
q(M:QWA q for(int index=0;index<MAX_KEY;index++){
<%?#AVU[ if(hCallWnd[index]==NULL)
r(A.<`\ continue;
\}0-^(9zd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f58?5(Dc| {
4,p;Km& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
V ~{fB~ bProcessed=TRUE;
{R6HG{"IS6 }
jNDx,7F- }
yHo[{,4itA }
GEUg]nw if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
%/%UX{8R for(int index=0;index<MAX_KEY;index++){
0E`1HP"b if(hCallWnd[index]==NULL)
5VW|fI continue;
q8P.,%
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7V7zGx+Z7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?/hZb"6W //lParam的意义可看MSDN中WM_KEYDOWN部分
yR5XJ;Tct }
ne}+E }
oXsL9, }
E0n6$5Uc? return CallNextHookEx( hHook, nCode, wParam, lParam );
b\7iY&.C| }
$FTO m"eteA,"k_ 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:
)RgGcHT@ tz NlJ~E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>o,^b\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-e GL) M W!Gdf^Yy< 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:
(.Y/ rh*sbZ68>E LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1Tp/MV/> {
$g9**b@ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
oPf)be| # {
KL,/2( //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
_*M42<wcO SaveBmp();
g`^X#-!( return FALSE;
bBcp9C)iY }
&C<yfRDu …… //其它处理及默认处理
jhgX{xc }
*A 'FC|\ DE$q+j0P g^Yl TB 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。
g]~h(mI "ICC
B1N| 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。
Fzlozx1y[ 75T_Dx(H 二、编程步骤
h"mi"H^o <yA}i"-1W 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";
38ES($ eDI=nSo 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
8LkP)]4^sO IA zZ1#/3 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;
+gd2|`# NH<gU_s8{9 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;
./vZe_o)j$ AFvgbn8Qh 5、 添加代码,编译运行程序。
,QIF & [jdFA<Is 三、程序代码
INs!Ame2 e1myH6$W ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
%VJ85^B3 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
lf<S_2i #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ZIR0PQh\ #if _MSC_VER > 1000
P;[OWSR[d #pragma once
1F'1>Bu~ #endif // _MSC_VER > 1000
WO5O?jo' #ifndef __AFXWIN_H__
b3-eR5U/ #error include 'stdafx.h' before including this file for PCH
}TQ{`a@ #endif
Am0{8
' #include "resource.h" // main symbols
Qhi '')Q class CHookApp : public CWinApp
Y/<lWbj*A {
'+>fFM,*B public:
F7L &=K$2y CHookApp();
d6{Gt" // Overrides
gbeghLP[? // ClassWizard generated virtual function overrides
/I5X"x //{{AFX_VIRTUAL(CHookApp)
:AdDLpk3j public:
-~[9U, virtual BOOL InitInstance();
/^{BUo virtual int ExitInstance();
7\zZpPDV //}}AFX_VIRTUAL
c\6+=\ //{{AFX_MSG(CHookApp)
bi y4d // NOTE - the ClassWizard will add and remove member functions here.
F;ZSzWq // DO NOT EDIT what you see in these blocks of generated code !
,d+fDmm3 //}}AFX_MSG
WO4=Mte? DECLARE_MESSAGE_MAP()
Zv_.na/^K };
c}*2$1 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
%D$,;{ew BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
V-I(WzR9y BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
XfE?C:v BOOL InitHotkey();
1be %G [* BOOL UnInit();
1axQ)},o@p #endif
Ab%;Z5$fr EFuvp8^y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
W!blAkM%i #include "stdafx.h"
mME4 l #include "hook.h"
n~V4nj&_T #include <windowsx.h>
1(zsOeX #ifdef _DEBUG
H7Uli]e3 #define new DEBUG_NEW
p^nL&yIW,% #undef THIS_FILE
E9|eu\ static char THIS_FILE[] = __FILE__;
n,HE0Zn]Y_ #endif
OH^N" L #define MAX_KEY 100
<e]Oa$ #define CTRLBIT 0x04
q+KzIde|% #define ALTBIT 0x02
"LYh7:0s!k #define SHIFTBIT 0x01
R3)57OyV #pragma data_seg("shareddata")
[XRCLi} HHOOK hHook =NULL;
l+V,DCE UINT nHookCount =0;
QVF]Ci_= static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"Td`AuP@, static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
4nH*Ui!T static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`-`qdda static int KeyCount =0;
!UOCJj.cA static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[%50/_h #pragma data_seg()
kg][qn|>J] HINSTANCE hins;
ML-)I&>tT void VerifyWindow();
|4mpohX BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Cz4)Yz //{{AFX_MSG_MAP(CHookApp)
`b8v1Os^2 // NOTE - the ClassWizard will add and remove mapping macros here.
+')f6P;t>= // DO NOT EDIT what you see in these blocks of generated code!
=cN&A_L( //}}AFX_MSG_MAP
Y={&5Mir END_MESSAGE_MAP()
Rj F'x G$'jEa<:u CHookApp::CHookApp()
ri`R<l8 {
$@d9<83= // TODO: add construction code here,
wiaX&-c]8 // Place all significant initialization in InitInstance
IM$2VlC }
w{~+EolK ms($9 Lv/ CHookApp theApp;
~^u16z, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Wk:hFHs3 {
E_F5(xSA BOOL bProcessed=FALSE;
}R3=fbe,\ if(HC_ACTION==nCode)
+$xeoxU>; {
,*4p?|A if((lParam&0xc0000000)==0xc0000000){// Key up
Z3k(P switch(wParam)
a $"ib {
87}&` case VK_MENU:
I -Xlx< MaskBits&=~ALTBIT;
6:U$w7P0
e break;
=ji1S}e~p case VK_CONTROL:
lPLz@Up~ MaskBits&=~CTRLBIT;
_|72r}j break;
2fU$J>Y case VK_SHIFT:
!zPG?q]3 MaskBits&=~SHIFTBIT;
{T"0DSV break;
h2ZkCML default: //judge the key and send message
|/gW_;( break;
-~eJn'W }
mcz+P | for(int index=0;index<MAX_KEY;index++){
f:g,_|JD$ if(hCallWnd[index]==NULL)
d=,%=@ continue;
1h*)@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9ukg }_Hx {
D+~_TA SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
s[8@*/ds bProcessed=TRUE;
2&+#Vsm`V }
J--m[X }
T081G`li }
J7C4V'_ else if((lParam&0xc000ffff)==1){ //Key down
P5lqSA{6 switch(wParam)
H$af/^ {
=#mTfJ case VK_MENU:
k OvDl!^ MaskBits|=ALTBIT;
tvXW break;
#j@71]GI case VK_CONTROL:
V{|}}b?w? MaskBits|=CTRLBIT;
mh<=[J,%p break;
eI1GXQ% case VK_SHIFT:
aNyvNEV3C MaskBits|=SHIFTBIT;
^xf<nNF:p break;
axHK_1N{ default: //judge the key and send message
]$U xCu break;
0-LpqX }
e*+FpW@ for(int index=0;index<MAX_KEY;index++)
=%zLh<3v {
`/Nm
2K if(hCallWnd[index]==NULL)
{bO|409>W continue;
[^8n0{JiN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
e]=!"nJ+ {
1!pa;$L SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
r>jC_7 bProcessed=TRUE;
)BfT7{WN }
^ kST
}
.(J?a" }
{0! ~C=P if(!bProcessed){
bYz&P`o} for(int index=0;index<MAX_KEY;index++){
=AVgIv if(hCallWnd[index]==NULL)
~&\ f|% continue;
a[lY S{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
R<i38/ ~G SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
'0$?h9" }
&V>fYgui }
yr#5k`&\_ }
"EU{8b return CallNextHookEx( hHook, nCode, wParam, lParam );
X(jVRr_m9 }
/ywD{* sH[
-W- BOOL InitHotkey()
I\qYkWg7 {
K[chjp!$l if(hHook!=NULL){
y~IuP c nHookCount++;
X0-IRJ[ return TRUE;
TO2c"7td }
v^ d]rSm else
Jc)^49Rf hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
9w9jpe# if(hHook!=NULL)
)otb>w5 nHookCount++;
DO7W}WU return (hHook!=NULL);
r_EcMIuk }
9dMrgz&' BOOL UnInit()
:';L/x> {
y8VpFa if(nHookCount>1){
Q-#$Aa nHookCount--;
l{w#H|] return TRUE;
<8UYhGK }
iYnEwAoN; BOOL unhooked = UnhookWindowsHookEx(hHook);
;,&8QcSVY if(unhooked==TRUE){
h;5LgAY|v nHookCount=0;
iJnU% hHook=NULL;
3D9!M- }
Pmi#TW3X return unhooked;
= 07Gy, =i }
(;VVCAoy {brMqE>P# BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
&'l>rD^o {
M4ozTp<$O BOOL bAdded=FALSE;
K/ &?VIi`z for(int index=0;index<MAX_KEY;index++){
ND<!4!R^ if(hCallWnd[index]==0){
8@NH%zWBp hCallWnd[index]=hWnd;
XPB9~:: HotKey[index]=cKey;
:|o<SZ HotKeyMask[index]=cMask;
kP xa7 bAdded=TRUE;
#k3t3az2{ KeyCount++;
1Y_w5dU break;
"^I
mb, }
-/]W+[ }
t>B^q3\q? return bAdded;
zo;^m| }
?j^=u:< ]a2W e` BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C@N1ljXJT {
Q4t(@0e} BOOL bRemoved=FALSE;
8 i&_Jgmr for(int index=0;index<MAX_KEY;index++){
]*O/+ if(hCallWnd[index]==hWnd){
]CU]pK?nq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>r &;3:" hCallWnd[index]=NULL;
9;yn}\N ` HotKey[index]=0;
)'l*Tl HotKeyMask[index]=0;
A?G IBjs bRemoved=TRUE;
4`#F^2r! KeyCount--;
vi@Lz3}:: break;
39{{7(hh }
B7\k< Nit0 }
OdMO=Hy6d }
?Z\Yu' return bRemoved;
(><zsLs& }
PiFD^w UR(-q void VerifyWindow()
W~_t~Vg5 {
}0,>2TTDN for(int i=0;i<MAX_KEY;i++){
dk8wIa"K` if(hCallWnd
!=NULL){ `ovtHl3Q
if(!IsWindow(hCallWnd)){ UEak^Mm;=2
hCallWnd=NULL; 4Ij-Ilg)%
HotKey=0; i?Ss: v^
HotKeyMask=0; ,wwZI`>-
KeyCount--; > Oh?%%6
} *9ywXm&?
} Ba\6?K
} 3p?KU-
} T+LJ*I4
j?b\+rr
BOOL CHookApp::InitInstance() `"vZ);i<
{ pIWI
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Es 5
hins=AfxGetInstanceHandle(); KCe13!
InitHotkey(); |L_wX:d`9
return CWinApp::InitInstance(); _DRrznaw
} W;?(,xx
:5GZ \Z8F
int CHookApp::ExitInstance() '2hbJk
{ JT[*3h
VerifyWindow(); uhN%Aj\iu(
UnInit(); NGYyn`Lx
return CWinApp::ExitInstance(); h5
Vv:C
} +b;hBb]R
W{XkVKe1a
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +@X5!S6
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z,N$A7SBE
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7iuQ9q^&
#if _MSC_VER > 1000 Q5S,{ ZeT
#pragma once M8w5Ob
#endif // _MSC_VER > 1000 fpM#XFj
4VN aq<8
class CCaptureDlg : public CDialog Z?i /r5F
{ }aB#z<B6
// Construction #s5 pz8v
public: KsAH]2Q%
BOOL bTray; F=G{)*Ih
BOOL bRegistered; *X%m@KLIKv
BOOL RegisterHotkey(); e2CV6F@a
UCHAR cKey; %u?HF4S'
UCHAR cMask; Gt9wR
void DeleteIcon(); ^SEdA=!
void AddIcon(); WUAJjds
UINT nCount; fbZibcQ%k
void SaveBmp(); hwnx<f '
CCaptureDlg(CWnd* pParent = NULL); // standard constructor UVf\2\ Y
// Dialog Data IL7`0cN(
//{{AFX_DATA(CCaptureDlg) jW*1E*"
enum { IDD = IDD_CAPTURE_DIALOG }; :ZdUx
CComboBox m_Key; ~Pk0u{,4XQ
BOOL m_bControl; 4yMW^:@
BOOL m_bAlt; ?_6YtR,{
BOOL m_bShift; =fc:6JR
CString m_Path; ^ L:cjY/
CString m_Number; zH)_vW
//}}AFX_DATA 9-*NW0
// ClassWizard generated virtual function overrides ]kktoP|D
//{{AFX_VIRTUAL(CCaptureDlg) B%<e FFV\
public: "oJ(J{Jat
virtual BOOL PreTranslateMessage(MSG* pMsg); Ft%hh|$5y
protected: HN5W@5m:
.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mkvvNm3
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hJ%1
//}}AFX_VIRTUAL h
-_&MD/J
// Implementation (J:dK=O@Z
protected: ic6L9>[
HICON m_hIcon; Y5A~E#zw
// Generated message map functions [nN7qG
//{{AFX_MSG(CCaptureDlg) PW}OU9is
virtual BOOL OnInitDialog(); p5c8YfM
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~pP0|B*%
afx_msg void OnPaint(); pLoy
afx_msg HCURSOR OnQueryDragIcon(); "5DJu~
virtual void OnCancel(); V7CoZnz
afx_msg void OnAbout(); vTr34n
afx_msg void OnBrowse(); A,i()R'I
afx_msg void OnChange(); t> Q{yw
//}}AFX_MSG x49!{}
DECLARE_MESSAGE_MAP() J$uM 03
}; P1 +"v*
#endif _rQUE^9
#,f{Ok+
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XL<
)v_
#include "stdafx.h" vg%QXaM
#include "Capture.h" V:K;] h*!
#include "CaptureDlg.h" hsce:TB
#include <windowsx.h> kv|,b
#pragma comment(lib,"hook.lib") _ P ,@
#ifdef _DEBUG ESQ!@G/n
#define new DEBUG_NEW O?K./So&
#undef THIS_FILE sn\;bq
static char THIS_FILE[] = __FILE__; o sdOw8
#endif tR`S#rk
#define IDM_SHELL WM_USER+1 #JNy
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gzfb zt}?
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H9"= p
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oC dGQ7G}
class CAboutDlg : public CDialog T@+ClZi
{ OS7RQw1
public: 10N,?a
CAboutDlg(); B<
;==|
// Dialog Data &a~=b,
//{{AFX_DATA(CAboutDlg) 3_ 2hC!u!K
enum { IDD = IDD_ABOUTBOX }; VAj<E0>
//}}AFX_DATA &/F_*=VE
// ClassWizard generated virtual function overrides P@ypk^v
//{{AFX_VIRTUAL(CAboutDlg) tbj=~xYf
protected: Z}Cqd?_')
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i*tv,f.(
//}}AFX_VIRTUAL ~@c-*
// Implementation g,lY ut
protected: 0%Q9}l#7
//{{AFX_MSG(CAboutDlg) 8Pmwzpk02
//}}AFX_MSG 9 pKm*n&
DECLARE_MESSAGE_MAP() X B I;Lg
}; TL-i=\{L:d
}0eg{{g8
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) oj.lj!
{ \XH@b6{
//{{AFX_DATA_INIT(CAboutDlg) '"O&J}s;
//}}AFX_DATA_INIT T&}Ye\%
} V:^H4WvL\W
9`X&,S~e
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N=fz/CD)I
{ -q2MrJ*
CDialog::DoDataExchange(pDX); 8]*Q79
//{{AFX_DATA_MAP(CAboutDlg) X\A]"su
//}}AFX_DATA_MAP 9]~PCZ2j
} lSCY5[?
Z] { @H
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) JLUms
//{{AFX_MSG_MAP(CAboutDlg) i&F~=Q`
// No message handlers LD.Ck6@
//}}AFX_MSG_MAP Z;*`fd?8
END_MESSAGE_MAP() H1UL.g%d=
"Gh#`T0#a
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &c^7O#j
: CDialog(CCaptureDlg::IDD, pParent) 0/A-#'>
{ 2ij/N%l
//{{AFX_DATA_INIT(CCaptureDlg) U>3
>Ex
m_bControl = FALSE; .ev\M0Dt
m_bAlt = FALSE; }u^:MI
m_bShift = FALSE; Ru7L>(Njs
m_Path = _T("c:\\"); 8&Wx@QI
m_Number = _T("0 picture captured."); *PcVSEP/0
nCount=0; @,6ST0xT (
bRegistered=FALSE; &wGg6$
bTray=FALSE; rt;gC[3\
//}}AFX_DATA_INIT vl~%o@*_
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HWbBChDF
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NKh,z&
_5-
} u[[/w&UV.,
@^HwrwRA
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) RK3.-
{ fk\5D[j^
CDialog::DoDataExchange(pDX); 6aSM*S)
//{{AFX_DATA_MAP(CCaptureDlg) _h~p:=
DDX_Control(pDX, IDC_KEY, m_Key); c%yh(g
DDX_Check(pDX, IDC_CONTROL, m_bControl); fv|%Ocm
DDX_Check(pDX, IDC_ALT, m_bAlt); o[{&!t
DDX_Check(pDX, IDC_SHIFT, m_bShift); }~GV'7d1
DDX_Text(pDX, IDC_PATH, m_Path); Q0SW;o7
DDX_Text(pDX, IDC_NUMBER, m_Number); XPVV+.
//}}AFX_DATA_MAP g^n;IE$B
} :~r#LRgc
Ph"iX'J
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3:O+GQ*
//{{AFX_MSG_MAP(CCaptureDlg) W:>J864!
ON_WM_SYSCOMMAND() mS7E_A8
ON_WM_PAINT() wy\o*P9mG)
ON_WM_QUERYDRAGICON() z@n+7p`w
ON_BN_CLICKED(ID_ABOUT, OnAbout) scmto cm
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3DI^y`av
ON_BN_CLICKED(ID_CHANGE, OnChange) G4);/#
//}}AFX_MSG_MAP 5F03y`@ u
END_MESSAGE_MAP() /MqP[*L
w*2^/zh
BOOL CCaptureDlg::OnInitDialog() +DxifXtB
{ v['AB4
CDialog::OnInitDialog(); 1l~.R#W G&
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); PIpWa$b
ASSERT(IDM_ABOUTBOX < 0xF000); nO:HB.&@
CMenu* pSysMenu = GetSystemMenu(FALSE); CH#kvR2
if (pSysMenu != NULL) KMe.i'
{ , Z4p0M
CString strAboutMenu; !r2}59J
strAboutMenu.LoadString(IDS_ABOUTBOX); =_pmy>_z
if (!strAboutMenu.IsEmpty()) .Wh6(LDY(
{ Q%$i@JH`m
pSysMenu->AppendMenu(MF_SEPARATOR); M3PVixli3
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }kv) IJ
}
Tu'E{Hw
} "1CGO@AXS
SetIcon(m_hIcon, TRUE); // Set big icon `^`9{@~
SetIcon(m_hIcon, FALSE); // Set small icon 2}>go^#O/w
m_Key.SetCurSel(0); }o{!}g9
RegisterHotkey(); L:Ed-=|Uw
CMenu* pMenu=GetSystemMenu(FALSE); ?^ eJ:
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); f5N<3 m=
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w[M5M2CF
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Hq79/wKj
return TRUE; // return TRUE unless you set the focus to a control 0A@-9w=u
} DZF[dxH
AwA1&mh
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)
]&/0
{ CARq^xI-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) i{4'cdr?
{ '%3u%;"
CAboutDlg dlgAbout; ?F!W#
dlgAbout.DoModal(); /S/tE
} !+%Az*ik
else MQjG<O\
{ EOofa6f&l
CDialog::OnSysCommand(nID, lParam); HI7]%<L
} 6@i|Kw(:
} SG1&a:c+.
es{cn=\s
void CCaptureDlg::OnPaint() z`;&bg\8
{ S/KVN(Z
if (IsIconic()) `f2W;@V0
{ 54;l*}8Hl
CPaintDC dc(this); // device context for painting '[ @F%
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Cbazwq
// Center icon in client rectangle eR(\s_`
int cxIcon = GetSystemMetrics(SM_CXICON); sf<Q#ieTxY
int cyIcon = GetSystemMetrics(SM_CYICON); Ixyvn#ux)
CRect rect; Bd/}
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GetClientRect(&rect); N,h1$)\B#
int x = (rect.Width() - cxIcon + 1) / 2; VM=hQYe
int y = (rect.Height() - cyIcon + 1) / 2; \IO$+Guh
// Draw the icon t@l(xns V
dc.DrawIcon(x, y, m_hIcon); PjiNu.>2(
} t00\yb^vJ8
else |C&%S"*+D
{ BYkVg2D(
CDialog::OnPaint(); 8 /5sv
}
#_?426Wfs
} EKV+?jj$
^cfkP(Y3kx
HCURSOR CCaptureDlg::OnQueryDragIcon() z(c@(UD-_
{ o",f(v&u%
return (HCURSOR) m_hIcon; N`y}Gs
} "u .)X3
yBJ/>SAcG
void CCaptureDlg::OnCancel() +e&m#d
{ pjaiAe!k
if(bTray)
:<'i-Ur8
DeleteIcon(); A73V6"
CDialog::OnCancel(); GMVC&^
} h[Ndtq>3{
2V#c[%vI
void CCaptureDlg::OnAbout() d08`42Z69
{ pil0,r
$D
CAboutDlg dlg; r\4*\
dlg.DoModal(); {QIS411
} D!l [3
z }FiU[Hs
void CCaptureDlg::OnBrowse() UrD=|-r`
{ ;PuyA
CString str; U-wq- GT
BROWSEINFO bi; 6R$F =MB
char name[MAX_PATH]; Y&K<{KA\4
ZeroMemory(&bi,sizeof(BROWSEINFO)); Wq=ZU\Y
bi.hwndOwner=GetSafeHwnd(); lGD%R'}
bi.pszDisplayName=name; 1(#*'xR
bi.lpszTitle="Select folder"; b#?ai3E
bi.ulFlags=BIF_RETURNONLYFSDIRS; Nb|3?c_
LPITEMIDLIST idl=SHBrowseForFolder(&bi); =DeHxPv}f
if(idl==NULL) SH@
return;
c4!c_a2pS
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .Um?5wG~i
str.ReleaseBuffer(); =!1-AR%.^
m_Path=str; v#FJ+
if(str.GetAt(str.GetLength()-1)!='\\') {ar5c&<
m_Path+="\\"; 'xLM>6[wz
UpdateData(FALSE); %J/fg<W1
} "z{_hp{T^
^g}gT-l%
void CCaptureDlg::SaveBmp() :,xyVb+
{ ^P3g9'WK
CDC dc; .(P@Bl]XJ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Fy4<
CBitmap bm; D[>XwL
int Width=GetSystemMetrics(SM_CXSCREEN); Ak%no3:9
int Height=GetSystemMetrics(SM_CYSCREEN); b@{%qh,C
bm.CreateCompatibleBitmap(&dc,Width,Height); _rWM]
CDC tdc; +l[Z2mW
tdc.CreateCompatibleDC(&dc); i5L+8kx4
CBitmap*pOld=tdc.SelectObject(&bm); ,T,B0
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); []6ShcqJ[v
tdc.SelectObject(pOld); Y:tW]
BITMAP btm; ;*<{*6;=?
bm.GetBitmap(&btm); Nf/hr%jL
DWORD size=btm.bmWidthBytes*btm.bmHeight; CA~em_dC
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0x3 h8fs
BITMAPINFOHEADER bih; FthXFxwx$
bih.biBitCount=btm.bmBitsPixel; LP0;n\
bih.biClrImportant=0; 6.`} &E
bih.biClrUsed=0; !R] CmK
bih.biCompression=0; m<,y-bQ*(
bih.biHeight=btm.bmHeight; z1{E:~f
bih.biPlanes=1; a6#{2q
bih.biSize=sizeof(BITMAPINFOHEADER); p ?Ij-uo"o
bih.biSizeImage=size; +7lRP)1R
bih.biWidth=btm.bmWidth; Xj})?{FP
bih.biXPelsPerMeter=0; X1
0"G~0
bih.biYPelsPerMeter=0; k
vue@
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); }e/[$!35
static int filecount=0; vJ'yz#tl9
CString name; 4cErk)F4
name.Format("pict%04d.bmp",filecount++); Yq)YS]
name=m_Path+name; m&8U4uHN
BITMAPFILEHEADER bfh; [#,X$O>
bfh.bfReserved1=bfh.bfReserved2=0; r+V(1<`2X
bfh.bfType=((WORD)('M'<< 8)|'B'); l7D4`i<F
bfh.bfSize=54+size; j"D0nG,
bfh.bfOffBits=54; Mi%1+
CFile bf; mhJOR'2
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k?|F0e_
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); k #,Gfs
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); L8?Z!0D/h
bf.WriteHuge(lpData,size); w/^0tZ~
bf.Close(); D@lAT#vA
nCount++; y ? {PoNI
} 69<rsp(p
GlobalFreePtr(lpData); w|n?m
if(nCount==1) _>_ y@-b
m_Number.Format("%d picture captured.",nCount); @6I[{{>X
else Jq?^8y
m_Number.Format("%d pictures captured.",nCount); S7#^u`'Q_^
UpdateData(FALSE); LfjS[
} KH@) +Rj
l;][Q]Z@V
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n/-p;#R
{ 2Xj-A\Oh~
if(pMsg -> message == WM_KEYDOWN) qu#@F\gX
{ ,G!_ SZ
if(pMsg -> wParam == VK_ESCAPE) ,<
)/45
return TRUE; eqUn8<<s
if(pMsg -> wParam == VK_RETURN) Z>MJ0J76]
return TRUE;
5Ky9P z
} e G*s1uQl
return CDialog::PreTranslateMessage(pMsg); EDa08+Y
} U7f&N
G7kFo6Cb
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vp{RX8?.
{ {7M4SC@p|
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )*$
SaveBmp(); ~A:;?A'.
return FALSE; b$`4Nn|
} <+i`W7
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g:HbmXOBpj
CMenu pop; w4<u@L
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qdkTg: QJ,
CMenu*pMenu=pop.GetSubMenu(0); M;Mdz[Q
pMenu->SetDefaultItem(ID_EXITICON); Bc9|rl V,
CPoint pt; xUYN\Pc-
GetCursorPos(&pt); +G=C~X
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]K0,nj*\c
if(id==ID_EXITICON) -)->Jx:{
DeleteIcon(); pS|JDMo
else if(id==ID_EXIT) m(7_ZiL=
OnCancel(); ~V$5 m j
return FALSE; H@&"M%
} >*Qk~kv<%
LRESULT res= CDialog::WindowProc(message, wParam, lParam); BS<>gA
R;/
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8`LLHX1|
AddIcon(); !f]3Riw-=,
return res; J\,e/{,X
} hoD[wAC
5-QvQ&eH.
void CCaptureDlg::AddIcon() :+Je989\[C
{ j"$b%|
NOTIFYICONDATA data; ?[>BssW
data.cbSize=sizeof(NOTIFYICONDATA); :#!F 7u
CString tip; $gD(MKR)~
tip.LoadString(IDS_ICONTIP); ;Wrd=)Ka
data.hIcon=GetIcon(0); s)&R W#:X
data.hWnd=GetSafeHwnd(); 8-g$HXqs_#
strcpy(data.szTip,tip); xzf)_ <
data.uCallbackMessage=IDM_SHELL; ]I*#R9
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |sZ9/G7
data.uID=98; q&Ua(I
Shell_NotifyIcon(NIM_ADD,&data); J`D<
ShowWindow(SW_HIDE); V:"\(Y
bTray=TRUE; va*>q-QCr
} ea[a)Z7#
pcxl2I
void CCaptureDlg::DeleteIcon() ()IgSj?,
{ #(Yb
lY
NOTIFYICONDATA data; I8pxo7(-
data.cbSize=sizeof(NOTIFYICONDATA); o _,$`nEJ
data.hWnd=GetSafeHwnd(); H&K)q5~
data.uID=98; s].Cx4VQ
Shell_NotifyIcon(NIM_DELETE,&data); 0#[Nfe*
ShowWindow(SW_SHOW); [.#$hOsNR
SetForegroundWindow(); b8-^wJH!
ShowWindow(SW_SHOWNORMAL); 1nM?>j%k
bTray=FALSE; j~j
V`>A
} V9 t:JY
ojs/yjvx
void CCaptureDlg::OnChange() E":":AC#
{ k}a!lI:
RegisterHotkey(); ?B31t9
} YwTtI ID%
$HnD|_*
BOOL CCaptureDlg::RegisterHotkey() lV *&^Q8.
{ _f2iz4
UpdateData(); ewlc ^`
UCHAR mask=0; Q^5 t]HKn
UCHAR key=0; xx2:5
if(m_bControl) 9Qm{\
mask|=4; '
xq5tRg>
if(m_bAlt) cngPc]?N
mask|=2; K>p:?w
if(m_bShift) 7^}Z%c
mask|=1; $G([#N<
key=Key_Table[m_Key.GetCurSel()]; gmH0-W)=
if(bRegistered){ HE.Dl7{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); p.7p,CyB
bRegistered=FALSE;
!{=%l+^.
}
rlh6\Fa
cMask=mask; g<jK^\eW
cKey=key; -Y,Ibq
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4'eVFu+62
return bRegistered; =|zyi|
} us *l+Jw,m
K?<Odw'k
四、小结 ov.rHVeI
L7'X7WYf&
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。