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:
3#>;h
jF}zv 一、实现方法
Q(lj&!?1k 'BT}'qN 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:
K
GlO;Q~7 uM0!,~&9| #pragma data_seg("shareddata")
fn|l9k~ <O HHOOK hHook =NULL; //钩子句柄
2A3;#v UINT nHookCount =0; //挂接的程序数目
G~ZDXQ>5CP static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
zRvYN static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
=5dv38 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
BAoqO
Xv static int KeyCount =0;
+|#sF,,X4g static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
JEJ]'3 #pragma data_seg()
?_<ZCH n)`*{uv$ 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。
/^/'9}7 rQisk8% 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:
*%Gy-5hM H7qda'%> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
1grrb&K cKey,UCHAR cMask)
f_raICO{R {
i>)Whr'e8 BOOL bAdded=FALSE;
K3
]hUe# for(int index=0;index<MAX_KEY;index++){
I#9K/[ if(hCallWnd[index]==0){
} 10Dvt>+ hCallWnd[index]=hWnd;
Kk??} HotKey[index]=cKey;
iAXx`>}m HotKeyMask[index]=cMask;
[vIO bAdded=TRUE;
n287@Y4Ru KeyCount++;
SZyPl9.b break;
/+66y=`UJ }
oTT/;~ I }
l>H#\MR return bAdded;
-h8A< }
qAHQZKk //删除热键
m" .8- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$hn#T#J3 {
D$!(Iae BOOL bRemoved=FALSE;
,o*x\jrGw for(int index=0;index<MAX_KEY;index++){
Vw<=& w #K if(hCallWnd[index]==hWnd){
0a ZplE, if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
z3[
J> hCallWnd[index]=NULL;
S:+SZq HotKey[index]=0;
5@F1E8T HotKeyMask[index]=0;
jV#{8 8 bRemoved=TRUE;
G;>b}\Ng KeyCount--;
-5\hZ!!J2 break;
oZQ%P }
mi`!'If0) }
;07>ZH% }
{VmJVO]S return bRemoved;
;udV"7C }
V zTHW5B uB@~x Q_V ZZ*+Tl\
s DLL中的钩子函数如下:
yQz6K6p ?h|&kRq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
G4;5$YGG {
QWQJSz5 BOOL bProcessed=FALSE;
@{q:179w^ if(HC_ACTION==nCode)
I6e[K(7NY {
UTS.o#d if((lParam&0xc0000000)==0xc0000000){// 有键松开
ascY E switch(wParam)
"tF#]iQQ
u {
<y2HzBC case VK_MENU:
1DRih>+# MaskBits&=~ALTBIT;
AW<"3 !@ break;
<p5?yF case VK_CONTROL:
DJJd_ MaskBits&=~CTRLBIT;
v$)ZoM6E break;
UFzC8 case VK_SHIFT:
roM!%hb MaskBits&=~SHIFTBIT;
ia#8 ^z break;
<N(r- default: //judge the key and send message
<8iu :nR break;
<Toy8-kj }
#V$h?`qhwr for(int index=0;index<MAX_KEY;index++){
aoHAB<.C if(hCallWnd[index]==NULL)
{2.zzev' continue;
KXf(v4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$W;f9k@C! {
=&t]R?
F SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
V\nj7Gr:sF bProcessed=TRUE;
)#l&BV5 }
[x{Ai(
/T^ }
eh;L])~C }
f= A`{8^ else if((lParam&0xc000ffff)==1){ //有键按下
l:+$K s switch(wParam)
1hY%ZsjC {
6~OJB! case VK_MENU:
YSbeCyv MaskBits|=ALTBIT;
az[# q break;
dUL*~%2I case VK_CONTROL:
12@Ge] MaskBits|=CTRLBIT;
t|m=X break;
q 7-ZPX case VK_SHIFT:
dpvEY(Ds MaskBits|=SHIFTBIT;
Qp9QSyMs} break;
q"i]&dMr default: //judge the key and send message
22/"0=2g break;
=I0J1Ob }
hmB`+?,z* for(int index=0;index<MAX_KEY;index++){
26}fB if(hCallWnd[index]==NULL)
uO>pl37@ continue;
\M;cF"e-S if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.% +anVXS {
5<M$ XT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
#&b<D2d bProcessed=TRUE;
3^iVDbAW{ }
^Y%<$IFG }
i|rC Ga0} }
gZBb/< if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
6rM{r> for(int index=0;index<MAX_KEY;index++){
E`Br# "/Bl if(hCallWnd[index]==NULL)
c!GJS`/ continue;
55ft,a if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
L|nFN}da SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
YU XxQ| //lParam的意义可看MSDN中WM_KEYDOWN部分
D!8v$(#hR }
yg6o#; }
@;tM R|p }
fWf't2H& return CallNextHookEx( hHook, nCode, wParam, lParam );
A"1%E.1 }
Gx*B(t]4y 1\)C;c, 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:
?Yx2q_KZk Q!r&vQ/g BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_4T7Vg'' BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\t%iUZ$ QQ=Kj%R 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:
#.vp\W I%b5a`7 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
f&txg,W,yv {
MEM(uBYKOb if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
NZO86y/ {
h/2@4XKj //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
<m0=bm{j SaveBmp();
| )br-?2 return FALSE;
$inKI }
HCx0'|J …… //其它处理及默认处理
omznSL }
v2a(yH ^*+j7A.n "Pu917_P 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。
M`7[hr &M tF 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。
O.Y|},F ;$8ptB . 二、编程步骤
aHb&+/HZ p8"C`bCf 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
N<<O(r &g>MZ"Z| 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
'T(Q K4o']{:U 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Spu; kd_!S[ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
&ld<fa(w+2 nE?:nJ|%E 5、 添加代码,编译运行程序。
{U@"]{3Qx ;JgSA&'e 三、程序代码
s];0-65) X"mPRnE330 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
kw} E0uY #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
bxO[y<|XL #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
c}|} o^ #if _MSC_VER > 1000
Z15=vsV #pragma once
V|F/ynJfA #endif // _MSC_VER > 1000
+>AVxV=A# #ifndef __AFXWIN_H__
i3KAJ@ #error include 'stdafx.h' before including this file for PCH
XH0o8\. #endif
PW iuM=E #include "resource.h" // main symbols
1f1D^| class CHookApp : public CWinApp
WnU2.: {
@P>>:002/ public:
f3^qO9R CHookApp();
7]Hf3]e>/ // Overrides
Z0O0Q =e\Y // ClassWizard generated virtual function overrides
I,05'edCQ //{{AFX_VIRTUAL(CHookApp)
s<Nw)Ynw public:
Ao*:$:k virtual BOOL InitInstance();
aP/Ff%5T virtual int ExitInstance();
t lpTq\; //}}AFX_VIRTUAL
u E<1PgW //{{AFX_MSG(CHookApp)
(KnU-E]L // NOTE - the ClassWizard will add and remove member functions here.
?P(U/DS8 // DO NOT EDIT what you see in these blocks of generated code !
^IO\J{U{"x //}}AFX_MSG
kn}bb*eZ DECLARE_MESSAGE_MAP()
2j=HxE };
g:Ry.=F7W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
+f'@ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
KU;J2Kt BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Pp`[E/
qj4 BOOL InitHotkey();
[I78<IJc BOOL UnInit();
oT"7O5v #endif
N[kl3h%q X-`PF //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
cRP!O|I`] #include "stdafx.h"
;Hn>Ew #include "hook.h"
iVA=D&eZ #include <windowsx.h>
G' mg-{ #ifdef _DEBUG
d Y`P #define new DEBUG_NEW
*|6*jU #undef THIS_FILE
yHn8t]{ static char THIS_FILE[] = __FILE__;
rs,:pU #endif
9!s)52qt #define MAX_KEY 100
Q; BD|95nl #define CTRLBIT 0x04
M`,`2I A #define ALTBIT 0x02
!5K5;M_Ih" #define SHIFTBIT 0x01
>?r8D48` #pragma data_seg("shareddata")
pZ&?uo67_ HHOOK hHook =NULL;
\' >d.'d UINT nHookCount =0;
U]
av{}U static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@'JA3V} static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
$mut v=IO static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
D9higsN static int KeyCount =0;
`tJ"wpCf6 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
H*h4D+Kxv #pragma data_seg()
^%}PRl9 HINSTANCE hins;
RpU.v
` void VerifyWindow();
W|V9:A BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
kB]*2o9-3 //{{AFX_MSG_MAP(CHookApp)
UUqA^yJ // NOTE - the ClassWizard will add and remove mapping macros here.
JjnWv7W3$ // DO NOT EDIT what you see in these blocks of generated code!
YI+o:fGC5 //}}AFX_MSG_MAP
DQ%(X&k END_MESSAGE_MAP()
uX~YDy F 8 gw3 CHookApp::CHookApp()
mLH,6rO9 {
m" c6^)U // TODO: add construction code here,
h[r)HX0hA // Place all significant initialization in InitInstance
VVHL@ }
zI.:1(, Gw?ueui< CHookApp theApp;
.*nr3dY LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$(&+NJ$U$ {
/9SNXjfbt BOOL bProcessed=FALSE;
Hzojv<c if(HC_ACTION==nCode)
+p0Y*. {
-e_B if((lParam&0xc0000000)==0xc0000000){// Key up
p9j2jb,qy switch(wParam)
\Vl)q>K_h {
pzcof#2 case VK_MENU:
XrN]}S$N MaskBits&=~ALTBIT;
o5< w2( break;
`k~w
14~w case VK_CONTROL:
-'RD%_ MaskBits&=~CTRLBIT;
8o[+>W break;
F{F SmUxzK case VK_SHIFT:
Vl0Y'@{ MaskBits&=~SHIFTBIT;
JeU1r-i break;
0l~z0pvT default: //judge the key and send message
_QiGrC break;
~uh,R-Q$ }
hXQo>t-$ for(int index=0;index<MAX_KEY;index++){
ANXN.V if(hCallWnd[index]==NULL)
!-s 6B continue;
mZ4I}_\, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
I0(nRu<
{
e4Xo(EY & SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
G|)fZQ1nS bProcessed=TRUE;
s -),Pv| }
Z~HLa }
^1`T_+#[s }
c$~J7e6$ else if((lParam&0xc000ffff)==1){ //Key down
4nGr?%> switch(wParam)
UszR. Z {
<(B: "wI case VK_MENU:
){xMMQ5 MaskBits|=ALTBIT;
*","u;& break;
uG7ll5Yy case VK_CONTROL:
6Y/TqI[
MaskBits|=CTRLBIT;
l8By2{pN break;
=pn(56 case VK_SHIFT:
7K &j MaskBits|=SHIFTBIT;
o3>D~9 break;
T``~YoIdz default: //judge the key and send message
E]%&)3O[ break;
q%c"`u/v/ }
WkK.ON^ for(int index=0;index<MAX_KEY;index++)
CO.e.:h {
Wup%.yT~Ds if(hCallWnd[index]==NULL)
Ar1X
mHq continue;
vAo|o* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
J7s\
{
4dUr8]BkG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~OOD#/ bProcessed=TRUE;
pQOT\- bD }
_-bEnF+/0 }
~Is-^k)y }
rklK=W z if(!bProcessed){
_33YgO for(int index=0;index<MAX_KEY;index++){
e?eX9yA7F if(hCallWnd[index]==NULL)
qlIbnyP< continue;
7="I; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
TH#5j.uUs SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
rdQ'#}Ix }
8WL*Pr1I }
u4;#~## }
TrC :CL return CallNextHookEx( hHook, nCode, wParam, lParam );
PvB-Cqc }
d@,3P)? a]8}zSUK BOOL InitHotkey()
I85bzzZB {
XoqmT/P if(hHook!=NULL){
8f{;oO nHookCount++;
coFQu ;i return TRUE;
>)`V$x }
jbK<"T5 else
g7nqe~`{ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
lpHz*NZ0 if(hHook!=NULL)
f+j-M|A nHookCount++;
p:q?8+W-r return (hHook!=NULL);
DqTp*hI }
)#_:5^1 BOOL UnInit()
2v9T&xo= {
_4h[q4Z if(nHookCount>1){
sFWH*kdP? nHookCount--;
{]=oOy1 return TRUE;
NamO5(1C }
NY!"?Zko BOOL unhooked = UnhookWindowsHookEx(hHook);
#Mmr{4m if(unhooked==TRUE){
lL{1wCsl nHookCount=0;
VUE6M\&z> hHook=NULL;
q%xq\L. }
3 h~U)mg return unhooked;
bMDj+i }
`zjbyY riz[AAB BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Lcow2 SbH {
PH6NU&H BOOL bAdded=FALSE;
y~-dQ7r for(int index=0;index<MAX_KEY;index++){
}n[<$*W^ if(hCallWnd[index]==0){
n7*.zI]%& hCallWnd[index]=hWnd;
oJ`cefcWo HotKey[index]=cKey;
]O1}q!s
HotKeyMask[index]=cMask;
SZ3UR bAdded=TRUE;
KDEcR KeyCount++;
N}5'Hk4+ break;
dSq3V#Q }
4b<>gpQ }
f zsD return bAdded;
d@IV@'Q7u }
>cYYr@S 7'1 +i BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
X\
bXat+ {
@?YO_</ BOOL bRemoved=FALSE;
KV { J>J1 for(int index=0;index<MAX_KEY;index++){
RZrQ^tI3" if(hCallWnd[index]==hWnd){
"GY/2; if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
h.WvPZ2U hCallWnd[index]=NULL;
V9cKl[ HotKey[index]=0;
-lDAxp6p HotKeyMask[index]=0;
w(-h!d51+ bRemoved=TRUE;
# @~HpqqR KeyCount--;
j|X>:!4r break;
O\&[|sGY{ }
N,F$^ q6 }
x!RpRq9 }
gtVnn]Jh return bRemoved;
RwyRPc_ }
UD}#c:I 6Qh@lro;y void VerifyWindow()
'j27.Ry. {
SG@-b( for(int i=0;i<MAX_KEY;i++){
H4{CiZ if(hCallWnd
!=NULL){ uW4wTAk;qh
if(!IsWindow(hCallWnd)){ H68~5lJY^]
hCallWnd=NULL; 'PK;Fg\
HotKey=0; ;2\+O"}4H
HotKeyMask=0; %f'mW2
KeyCount--; q47:kB{d
} {>rGe#Vu
} '"Z\8;5i
} Ae[Na:G+
} "J(0J
Y5,[udF:O
BOOL CHookApp::InitInstance() (RBzpAiH
{ JVxGS{Z
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'h.:-1# L
hins=AfxGetInstanceHandle(); mtd ,m
InitHotkey(); B/F6WQdZ
return CWinApp::InitInstance(); |S0nR<x-M
} g:rjt1w`D
u(W+hdTap=
int CHookApp::ExitInstance() 2>+(OL4l
{ X"Ca
VerifyWindow(); k3yA*Ec
UnInit(); o!@}&DE|*L
return CWinApp::ExitInstance(); !> 2kH
} /?*GJN#
bo|3sN+D
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }huFv*<@'
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) K{EDmC
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V]Z!x.x"=y
#if _MSC_VER > 1000 A}3dx!?7j
#pragma once `p'682x I
#endif // _MSC_VER > 1000 j[Q9_0R~lR
h
]6:`5-
class CCaptureDlg : public CDialog M~eXC
{ )eD9H*mq
// Construction 'B\7P*L"p
public: vN9R.R
BOOL bTray; mJNw<T4!/
BOOL bRegistered; ;_p$5GVR|
BOOL RegisterHotkey(); ISHzlEY
UCHAR cKey; K
7OIT2-
UCHAR cMask; 7SJR_G6,{
void DeleteIcon(); .L@gq/x)
void AddIcon(); S7
!;Z@
UINT nCount; VjLv{f<p
void SaveBmp(); pv]2"|]V)
CCaptureDlg(CWnd* pParent = NULL); // standard constructor c> 0R_
// Dialog Data dt|| nF
//{{AFX_DATA(CCaptureDlg) IqAML|C
enum { IDD = IDD_CAPTURE_DIALOG }; BIh^b?:zU
CComboBox m_Key; $W]}m"l
BOOL m_bControl; D/YMovH%
BOOL m_bAlt; Dbu>rESz
BOOL m_bShift; `?G&w.Vs
CString m_Path; ;-AC}jG
CString m_Number; mg]t)+ PQ
//}}AFX_DATA |=js!R|
// ClassWizard generated virtual function overrides H1.ktG
//{{AFX_VIRTUAL(CCaptureDlg) X;]Ijha<*
public: bae;2| w
virtual BOOL PreTranslateMessage(MSG* pMsg); Ao+6^z_
protected: $0Ys{m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UlKg2p
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);
bk i:u
//}}AFX_VIRTUAL 78<fbN5}r
// Implementation JE*?O*&|Q
protected: /[Rp~YzW
HICON m_hIcon; S&k/Pc
// Generated message map functions >?G!>kw
//{{AFX_MSG(CCaptureDlg) ]@}hyM[D;
virtual BOOL OnInitDialog(); jZvIqR/
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 322-'S3<
afx_msg void OnPaint(); De>,i%`Q,D
afx_msg HCURSOR OnQueryDragIcon(); &zVXd
virtual void OnCancel(); H7<g5pv
afx_msg void OnAbout(); 1|>bG#|
afx_msg void OnBrowse(); [D?d~pB
afx_msg void OnChange(); &NbSG+t
//}}AFX_MSG +UTBiB R
DECLARE_MESSAGE_MAP() ?[WUix;
}; s.KfMJ"u[
#endif O0bOv S
`bn@;7`X
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 62G%.'7
#include "stdafx.h" b.}J'?yLm
#include "Capture.h" *TCV}=V G
#include "CaptureDlg.h" Fta=yH}
#include <windowsx.h> &Wk:>9]Jrb
#pragma comment(lib,"hook.lib") :3J`+V}9;
#ifdef _DEBUG _(8N*q*w
#define new DEBUG_NEW w^7[4u4
#undef THIS_FILE CwyE8v
static char THIS_FILE[] = __FILE__; {W%XSE
#endif ST4[d'|j
#define IDM_SHELL WM_USER+1 ]!/R tt
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NpbZt;%t
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mQ<Vwx0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0wF)bQv1
class CAboutDlg : public CDialog gh `_{l
{ .hoVy*I
public: 8k.#4}fP
CAboutDlg(); vo~Qo;m
// Dialog Data 58`Dcx,yJ
//{{AFX_DATA(CAboutDlg) SK*<H~2
enum { IDD = IDD_ABOUTBOX }; 3J3wKw!`
//}}AFX_DATA 5*Dh#FRp
// ClassWizard generated virtual function overrides Q]dKyMSSA
//{{AFX_VIRTUAL(CAboutDlg) 1p<*11
protected: 'mF&`BN}b
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :01B)~^
//}}AFX_VIRTUAL Z]Cd> u
// Implementation L/5th}m
protected: muhu`
k`C
//{{AFX_MSG(CAboutDlg) ,WAJ&
'^
//}}AFX_MSG lt\Bm<"z!1
DECLARE_MESSAGE_MAP() lcfs
1].
}; qmNG|U&
A+fXt`YNM
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /U6ry'
{ X'xnJtk
//{{AFX_DATA_INIT(CAboutDlg) w.+G+r=
//}}AFX_DATA_INIT {rygIl{V
} v[jg|s&6"
3,Iu!KB
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %P C[-(Q
{ `@So6%3Y|
CDialog::DoDataExchange(pDX); "DX2Mu=
//{{AFX_DATA_MAP(CAboutDlg) bJw{ U.
//}}AFX_DATA_MAP crgVedx~}
} #TB
3|=
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) FvD/z;N
//{{AFX_MSG_MAP(CAboutDlg) {.Brh"yC
// No message handlers I(z16wQ
//}}AFX_MSG_MAP 7IrH(~Fo
END_MESSAGE_MAP() E7I$GD
B!4~A{
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z0&Y_Up+5
: CDialog(CCaptureDlg::IDD, pParent) o76{;Bl\O
{ Qn;,OBk
//{{AFX_DATA_INIT(CCaptureDlg) (Dx p
m_bControl = FALSE; EQ>@K-R
m_bAlt = FALSE; BP1<:T'.q`
m_bShift = FALSE; HzsQ`M4cA
m_Path = _T("c:\\"); w=5<mw
m_Number = _T("0 picture captured."); lnK#q.]
nCount=0; ss`Sl$
bRegistered=FALSE; Tz&h[+ 6`
bTray=FALSE; vX&W;&
//}}AFX_DATA_INIT nW
oh(a
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ue!yK
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x
}]"jj2x
} bYr*rEcA
Q!r` G
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #K!"/,d@>J
{ Q^X}7Z|T
CDialog::DoDataExchange(pDX); K87yQOjPv
//{{AFX_DATA_MAP(CCaptureDlg) -wh
DDX_Control(pDX, IDC_KEY, m_Key); 3u<
ntx ><
DDX_Check(pDX, IDC_CONTROL, m_bControl); ZVrZkd`
DDX_Check(pDX, IDC_ALT, m_bAlt); gs3(B/";c
DDX_Check(pDX, IDC_SHIFT, m_bShift); ?rQ .nN
DDX_Text(pDX, IDC_PATH, m_Path); E9j<+Ik
DDX_Text(pDX, IDC_NUMBER, m_Number); xO>z
)3A
//}}AFX_DATA_MAP c YgJ}(>}
} /tj]^QspS
\u[}
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _xePh
//{{AFX_MSG_MAP(CCaptureDlg) p@f
#fs
ON_WM_SYSCOMMAND() t :YZua
ON_WM_PAINT() wods
ON_WM_QUERYDRAGICON() nfHjIYid
ON_BN_CLICKED(ID_ABOUT, OnAbout) iv +a5
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) m=@xZw<
ON_BN_CLICKED(ID_CHANGE, OnChange) 7afG4
(<k
//}}AFX_MSG_MAP mih}?oi
END_MESSAGE_MAP() !nkIXgWz
^;a
.;wR
BOOL CCaptureDlg::OnInitDialog() \&kj#)JYA
{ N ~=PecQ
CDialog::OnInitDialog(); TCRTC0_}k
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8=L"rekV_
ASSERT(IDM_ABOUTBOX < 0xF000); l3 F$5n
CMenu* pSysMenu = GetSystemMenu(FALSE); 5U7,,oyh
if (pSysMenu != NULL) X/:V{2
{ Rh~b,"
CString strAboutMenu; H%Vf$1/TF
strAboutMenu.LoadString(IDS_ABOUTBOX); KMy"DVqE
if (!strAboutMenu.IsEmpty()) ohKoX$|p~
{ oX:&;KA
pSysMenu->AppendMenu(MF_SEPARATOR); <lIm==U<-
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); uoE+:,P
} 2@Yu:|d4U
} tkk8b6%h?p
SetIcon(m_hIcon, TRUE); // Set big icon jnOnV1I"
SetIcon(m_hIcon, FALSE); // Set small icon xS12$ib ~G
m_Key.SetCurSel(0); f?/OV *
RegisterHotkey(); Yh1nXkA!V
CMenu* pMenu=GetSystemMenu(FALSE); U"8Hw@
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); MF'Z?M
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); aQL0Sj:,
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %!A:Ka!m.
return TRUE; // return TRUE unless you set the focus to a control z4BU}`;b3t
} D`^wj FF
s(Gs?6}>T
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) SS%Bde&<{
{ bR"4:b>K
if ((nID & 0xFFF0) == IDM_ABOUTBOX) -JEPh!oTt
{ dpq(=s`s
CAboutDlg dlgAbout; r-$xLe7a
dlgAbout.DoModal(); e.MyJ:eL
} ;yNY/
else Q3hf =&$
{ azIhp{rHw
CDialog::OnSysCommand(nID, lParam); 7c(j1:Ku-
} Bq)dqLwk
} Rq+7&%dy
p%*s3E1.D
void CCaptureDlg::OnPaint() &1T)'Bn
{ >2>/
q?
if (IsIconic()) i9Bh<j>:J
{ sS{Co8EJn
CPaintDC dc(this); // device context for painting P^F3,'N
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); y lczM^@
// Center icon in client rectangle jG&HPVr
int cxIcon = GetSystemMetrics(SM_CXICON); REU&8J@k&?
int cyIcon = GetSystemMetrics(SM_CYICON); M}X `
CRect rect; rQT%~oM:
GetClientRect(&rect); iNkN'("
int x = (rect.Width() - cxIcon + 1) / 2; D`G; C
int y = (rect.Height() - cyIcon + 1) / 2; N}nE9z5
// Draw the icon .zdaY,
U
dc.DrawIcon(x, y, m_hIcon); BJ3<"D{.*4
} vde!k_,wZ
else _y6iR&&x
{ M .6BFC
CDialog::OnPaint(); Xa>'DO2
} mgH~GKf^
} @0EY5{&
>G!=lLyR
HCURSOR CCaptureDlg::OnQueryDragIcon() $LuU
{ NGi)Lh|
return (HCURSOR) m_hIcon; ?;UR9f|!
} V /\Y(Mxc
93.\.&L\
void CCaptureDlg::OnCancel() xC9?rLUZ
{ `'iO+/;GY
if(bTray) .'66]QW
DeleteIcon(); Jjj;v2uSK
CDialog::OnCancel(); *[
0,QEy
} (5Q<xJ
Pm^FSw"
void CCaptureDlg::OnAbout() F(/<ADx
{ sbVEA
CAboutDlg dlg; ;TDvk]:
dlg.DoModal(); sd+_NtH
} W.{+0xx
rkWy3X{%2<
void CCaptureDlg::OnBrowse() 8*?H~q~
{ }@
U}c6/
CString str; f-i5tnh
BROWSEINFO bi; rIB./,
char name[MAX_PATH]; )O*h79t^Q
ZeroMemory(&bi,sizeof(BROWSEINFO)); )Z4iM;4]
bi.hwndOwner=GetSafeHwnd(); ( -q0!]E
bi.pszDisplayName=name; }RkD7
bi.lpszTitle="Select folder"; @p7*JLO
bi.ulFlags=BIF_RETURNONLYFSDIRS; Io)@u~yz
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,09d"7`X
if(idl==NULL) n{.SNipU
return; .\AbE*lZ#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h&t9CpTfeJ
str.ReleaseBuffer(); iD!]I$
m_Path=str; G~\=:d=^,`
if(str.GetAt(str.GetLength()-1)!='\\') :#spL*FIx
m_Path+="\\"; ^WIGd"^
UpdateData(FALSE); kT{d pGU9
} 6y)NH 8l7
_WHGd&u
void CCaptureDlg::SaveBmp() Z|$OPMLX
{ 8|\?imOp\[
CDC dc; | <l=i(
dc.CreateDC("DISPLAY",NULL,NULL,NULL); q{oppali
CBitmap bm; Q|:qs\6q5
int Width=GetSystemMetrics(SM_CXSCREEN); !qVnziE,,
int Height=GetSystemMetrics(SM_CYSCREEN); dht*1i3v
bm.CreateCompatibleBitmap(&dc,Width,Height); LO
M-i>
CDC tdc; A;C)#Q/
tdc.CreateCompatibleDC(&dc); i;}mIsNBY
CBitmap*pOld=tdc.SelectObject(&bm); i@#fyU)[G
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XSz)$9~hk
tdc.SelectObject(pOld); 4BAG GD2
BITMAP btm; $n@B:kv5p
bm.GetBitmap(&btm); 6.gk6
DWORD size=btm.bmWidthBytes*btm.bmHeight; TbA=bkj[4
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 924a1
BITMAPINFOHEADER bih; [&a=vE
bih.biBitCount=btm.bmBitsPixel; XhG3Of-6
bih.biClrImportant=0; |jE0H!j
bih.biClrUsed=0; xnD"LK
bih.biCompression=0; _G=k^f_
bih.biHeight=btm.bmHeight; Y|96K2BR
bih.biPlanes=1; /L? ia
bih.biSize=sizeof(BITMAPINFOHEADER); JE.s?k
bih.biSizeImage=size; JP*VR=0k?
bih.biWidth=btm.bmWidth; %T'<vw0
bih.biXPelsPerMeter=0; Sn!5/9Y
bih.biYPelsPerMeter=0; 8[xl3=
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _Kf8,|+
static int filecount=0; =S:Snk%
CString name; Y('?Z]
name.Format("pict%04d.bmp",filecount++); L:E?tR}H
name=m_Path+name; `PApmS~}
.
BITMAPFILEHEADER bfh; Vmf!0-
bfh.bfReserved1=bfh.bfReserved2=0; ]ovb!X_
bfh.bfType=((WORD)('M'<< 8)|'B'); Kk9W=vd
bfh.bfSize=54+size; p?XVO#
bfh.bfOffBits=54; (N
:vDq'
CFile bf; c}r"O8M
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;o-c.-!F
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #9ZHt5T=$
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); x|lX1Mh$
bf.WriteHuge(lpData,size); }*9mNE
bf.Close(); \olYv!f
nCount++; I$w:qS&:
} Iu|4QE
GlobalFreePtr(lpData); pDV8B/{
if(nCount==1) A{Dy3tm=
m_Number.Format("%d picture captured.",nCount); Y~[k_!
else 5Gw B1}q
m_Number.Format("%d pictures captured.",nCount); pa8R;A70Dl
UpdateData(FALSE); aT"0tn^LO
} *\PCMl
S@Q4fmH
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #)PAvBJ;m
{ 4(D/~OG-6
if(pMsg -> message == WM_KEYDOWN) :ExCGS[
{ xfK@tLEZ-1
if(pMsg -> wParam == VK_ESCAPE) j9^V)\6)
return TRUE; ,A9_xdv5
if(pMsg -> wParam == VK_RETURN) K|sk]2.
return TRUE; f1,VbuS9I
} $1}Y4>3
return CDialog::PreTranslateMessage(pMsg); q)PLc{NO
} &Xh_`*]ox
PB(I3R9
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @+p(%
{ 4<E <sD
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Jn|i!
SaveBmp(); >!']w{G
return FALSE; j}
^3v #
} |%F4`gz8KP
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .%.7~Nu,
CMenu pop; Lq;iR
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !V/\_P!I
CMenu*pMenu=pop.GetSubMenu(0); 1t?OD_d!8
pMenu->SetDefaultItem(ID_EXITICON); TKsP#Dt/
CPoint pt; N#e9w3Rli
GetCursorPos(&pt); =VZ_';b h
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Q#qfuwz
if(id==ID_EXITICON) 2?Jw0Wq5D
DeleteIcon(); +YW;63"o
else if(id==ID_EXIT) 4\v &8">LL
OnCancel(); o}/|"(K
return FALSE; 7t<MHdw
} GQ@mQ=i
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q25VG5G
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) g9VY{[V
AddIcon(); Jkbeh.
return res; @y;VV*
} r]p3DQ
96V8R<
void CCaptureDlg::AddIcon() B0Wf$
s^7t
{ lF!PiL
NOTIFYICONDATA data; "V]*ov&[
data.cbSize=sizeof(NOTIFYICONDATA); 3qe`#j
CString tip; LsERcjwwK
tip.LoadString(IDS_ICONTIP); K)LoZ^x0)
data.hIcon=GetIcon(0); (cLK hn@
data.hWnd=GetSafeHwnd(); "73y}'
strcpy(data.szTip,tip); > U?\WgE$
data.uCallbackMessage=IDM_SHELL; IVSC7SBiT
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^ul1{
data.uID=98; "{D/a7]lC
Shell_NotifyIcon(NIM_ADD,&data); iiq
`:G
ShowWindow(SW_HIDE); ?; W"=I*3
bTray=TRUE; u5}:[4N%I
} :;eOhZ=_
EZB0qZIp
void CCaptureDlg::DeleteIcon() n&;JW6VQS
{ % E1r{`p
NOTIFYICONDATA data; 2v ~8fr4
data.cbSize=sizeof(NOTIFYICONDATA); .euAN8L
data.hWnd=GetSafeHwnd(); x&;AY
data.uID=98; _D4qnb@
Shell_NotifyIcon(NIM_DELETE,&data); GCN-T1HvA2
ShowWindow(SW_SHOW); WS n>P7sY
SetForegroundWindow(); |(%<FY$
ShowWindow(SW_SHOWNORMAL); n>.@@
bTray=FALSE; ]gPx%c
} HU?1>}4L
IwnDG;+Ap
void CCaptureDlg::OnChange() PdO"e
{ cF15Mm2
RegisterHotkey(); o4FHR+u<M
} &qXobJRM
A_@..hX(
BOOL CCaptureDlg::RegisterHotkey() +&G(AW
{ e5bXgmyil
UpdateData(); 8wkhbD|;
UCHAR mask=0; @~hy'6/
UCHAR key=0; ^x O](,H
if(m_bControl) y p{Dl
mask|=4; %W D^0U|
if(m_bAlt) Nxe1^F33
mask|=2; dM^EYW
if(m_bShift) Gf.ywqE$Y$
mask|=1; K]$PRg1|3
key=Key_Table[m_Key.GetCurSel()]; Ci-Ze j
if(bRegistered){ BJ5MCb.w
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7Q|<6210
bRegistered=FALSE; AcuZ?LYzK
} $Z)u04;&@
cMask=mask; toGd;2rl
cKey=key; L~/,;PHN
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Zfk]Z9YO
return bRegistered; pqO0M]}
} !{+CzUo@
*y?6m,38V
四、小结 g(i6Uj~)
giu{,gS0?M
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。