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:
Uj[E_4h
Dqw?3 KB 一、实现方法
tM$w0Cj ?{
0MF 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
J!GWP:b3 /.u0rxoRP} #pragma data_seg("shareddata")
:nHa-N3 HHOOK hHook =NULL; //钩子句柄
Dr!g$,9 UINT nHookCount =0; //挂接的程序数目
J~jR`2+r static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
LZB=vc|3/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
uzx?U3.\ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
VkNg Vjg static int KeyCount =0;
L/VlmN_v>s static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
VHlN;6Qlff #pragma data_seg()
$#/-+> 7jZ=+2 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
sr&hQ |aT&rpt DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
w)hH8jx{ n8.W$ &-ia BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
k yFq cKey,UCHAR cMask)
!4(X9}a {
M%evk4_27 BOOL bAdded=FALSE;
%` cP|k for(int index=0;index<MAX_KEY;index++){
)r)3.|wJm if(hCallWnd[index]==0){
_^ 2rRz hCallWnd[index]=hWnd;
#]iSh(|8 HotKey[index]=cKey;
KL8G2"Z HotKeyMask[index]=cMask;
FC:+[.fi bAdded=TRUE;
NT^m.o~4 KeyCount++;
"lFS{7 break;
!5hNG('f }
V5MLzW\8 }
e-Xr^@M*Q return bAdded;
_%xe:X+ M }
't+
J7 //删除热键
(^:0g.~c BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6z6\-45 {
yl>V' BOOL bRemoved=FALSE;
X#bK.WN$ for(int index=0;index<MAX_KEY;index++){
[O"9OW'2!B if(hCallWnd[index]==hWnd){
xp!MA if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
aDV~T24 hCallWnd[index]=NULL;
$S_xrrE# HotKey[index]=0;
ig Q,ZY1 HotKeyMask[index]=0;
$Z{ap bRemoved=TRUE;
^~3u|u KeyCount--;
^ZxT0oaL break;
9vQI
~rz? }
;i)NP X }
}#u.Of`6" }
K}vP0O} return bRemoved;
o =oXL2} }
!O`aaLc +b =X~>vZ G`/5= DLL中的钩子函数如下:
>1}RiOd3 3 #8bG( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
v%ldg833l {
&V`~ z
e BOOL bProcessed=FALSE;
nY>UYSv if(HC_ACTION==nCode)
| 61W-9; {
]^e4coC if((lParam&0xc0000000)==0xc0000000){// 有键松开
XF6ed switch(wParam)
$
$=N'Q {
jkVX>*.|oy case VK_MENU:
tdCD!rV`{ MaskBits&=~ALTBIT;
H% peE9>$ break;
lYF~CNvE case VK_CONTROL:
n$*e( MaskBits&=~CTRLBIT;
sp-){k break;
q':P9o*N? case VK_SHIFT:
r1jsw j%7 MaskBits&=~SHIFTBIT;
8]`LRzM break;
6h5,XcO4 default: //judge the key and send message
m,Fug1+N break;
xJ);P. }
3pk=c-x for(int index=0;index<MAX_KEY;index++){
e5GJ:2sH if(hCallWnd[index]==NULL)
kKFhbHUZa continue;
R7
WGc[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
RBA{! {
~+~^c| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
F?!X<N{ bProcessed=TRUE;
U2DE zr }
MYlPG1X=? }
,&q
Q[i }
]\.3<^ else if((lParam&0xc000ffff)==1){ //有键按下
aANzL switch(wParam)
< %t$0' {
tLD(%s_ case VK_MENU:
ju8DmC5 MaskBits|=ALTBIT;
'",+2=JJ break;
VGVb3@ case VK_CONTROL:
4#fgUlV MaskBits|=CTRLBIT;
p%]ZG, break;
V49[XX case VK_SHIFT:
2Sha&Z*CE MaskBits|=SHIFTBIT;
S#|dmg;p break;
1M<;}hJ{/ default: //judge the key and send message
?kBX:(g break;
A4mnm6Tf }
+FGw)>g8'm for(int index=0;index<MAX_KEY;index++){
}R\;htmc; if(hCallWnd[index]==NULL)
*@-a{T} continue;
b;~?a#Z} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.}4^b\ {
dJf#j?\[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
=*\(Y(0 bProcessed=TRUE;
LV6BSQyQ }
RX cfd-us }
9u^ yEqG` }
iYR`|PJi if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
w dpd` for(int index=0;index<MAX_KEY;index++){
_]"uq/UWp if(hCallWnd[index]==NULL)
Mf_urbp] continue;
}P(<]UF if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}n;.E&<[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
1m\ihU //lParam的意义可看MSDN中WM_KEYDOWN部分
#BOLq`9f }
kWm[Lt }
ig}H7U2q@ }
yq]/r=e!k return CallNextHookEx( hHook, nCode, wParam, lParam );
<%ZlJ_cM }
032PR;] 7c>{og6 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:
\1[v-hvK \O
G`+"|L BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
NB)$l2<d BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
yGZsPQIaV h5p,BRtu 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
^sb+|b >DkRl LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
K=Y{iHn {
'M=c-{f~ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
227 Z6#CF! {
GW~ ZmK //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
}:9UI SaveBmp();
VcpN
PU6 return FALSE;
2y` :#e`x1 }
-xMM}r
y …… //其它处理及默认处理
2 i:tPe& }
M7.
fz"M dePI&z: p5?8E$VHV 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。
{cMf_qQ ~9h/{$ 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。
z>9gt P%_PG%O2p 二、编程步骤
OJTEvb6nPg ,?(IRiq% 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";
V(6GM+ rwCjNky! 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
>#8J@=iuqv 5l,Q=V^@l 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;
YdiXj |k+ +x:-W0C: 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;
OYwH$5 "u.4@^+i 5、 添加代码,编译运行程序。
t}A n: lgei<\6~n5 三、程序代码
RQt\_x7P ," ~4l&
///////////////////////////////////// Hook.h : main header file for the HOOK DLL
/Q*cyLv #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
;VIW/ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
u[yUUYe #if _MSC_VER > 1000
w$)E#|i #pragma once
}Pf7YuUZZ #endif // _MSC_VER > 1000
97~*Z|#<+ #ifndef __AFXWIN_H__
9_5tA'Q #error include 'stdafx.h' before including this file for PCH
3|g]2|~w@h #endif
+'fdAc:5', #include "resource.h" // main symbols
"H!2{l{ class CHookApp : public CWinApp
3t^r;b {
n]]!:jFC public:
I~:
AWS9 CHookApp();
+5C*i@v // Overrides
i[x;k;m2q // ClassWizard generated virtual function overrides
H;nq4;^yK //{{AFX_VIRTUAL(CHookApp)
qGgqAF#B public:
<+2M,fq+ virtual BOOL InitInstance();
J;S@Q/s virtual int ExitInstance();
_O*"_^6 //}}AFX_VIRTUAL
c7$U0JO //{{AFX_MSG(CHookApp)
// \UthOT // NOTE - the ClassWizard will add and remove member functions here.
<u9U%Vsi // DO NOT EDIT what you see in these blocks of generated code !
#H1ng<QV //}}AFX_MSG
(HZzA7eph DECLARE_MESSAGE_MAP()
T-L;iH~0 };
/92m5p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
ZZXQCP6] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u teI[Q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Q<F-l.q BOOL InitHotkey();
jSyF]$" BOOL UnInit();
-{A!zTw1w #endif
nS}XY 7k>sE //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Vgh_F8G!V #include "stdafx.h"
M6+_Mi. #include "hook.h"
@I '_ #include <windowsx.h>
XdDy0e4{%< #ifdef _DEBUG
#y2="$V #define new DEBUG_NEW
'J+Vw9s7 #undef THIS_FILE
0Ac]&N d` static char THIS_FILE[] = __FILE__;
@ttcFX1:W #endif
>:h
8T]F #define MAX_KEY 100
:^! wQ""
#define CTRLBIT 0x04
t$rWE|+_z #define ALTBIT 0x02
xlS
t #define SHIFTBIT 0x01
X1y1 #pragma data_seg("shareddata")
1rT}mm/e; HHOOK hHook =NULL;
(F~eknJ UINT nHookCount =0;
1% EIP-z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
lOcvRF static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
^]AjcctGr static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ku 56TH!Py static int KeyCount =0;
js'*:*7 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
!9OAMHa*9 #pragma data_seg()
FpCj$y~3 HINSTANCE hins;
X -6Se void VerifyWindow();
h`?0=:Tru BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
[m!$01= //{{AFX_MSG_MAP(CHookApp)
2u/(Q># // NOTE - the ClassWizard will add and remove mapping macros here.
x>p=1(L // DO NOT EDIT what you see in these blocks of generated code!
HFvhrG //}}AFX_MSG_MAP
@ U:WWTzf END_MESSAGE_MAP()
hjaI&?w pA"pt~6 CHookApp::CHookApp()
jpT!di {
sm4@ywd> // TODO: add construction code here,
}a-ikFQ] // Place all significant initialization in InitInstance
5{[3I|m{ }
:KMo'pL E+UOuf*( CHookApp theApp;
\d]&}`'4{f LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
;m@>v?zE {
^4c2}>f BOOL bProcessed=FALSE;
Nbuaw[[iz if(HC_ACTION==nCode)
UFC.!t-Z {
y/4 4((O if((lParam&0xc0000000)==0xc0000000){// Key up
W;Ox H"eC switch(wParam)
Ed.~9*m {
Et# }XVCJ case VK_MENU:
pcoJ\&&W MaskBits&=~ALTBIT;
a}El!7RO0 break;
m-7^$ case VK_CONTROL:
X}h{xl MaskBits&=~CTRLBIT;
@X break;
NJLU+byU case VK_SHIFT:
daY^{u3 MaskBits&=~SHIFTBIT;
]'DtuT?Z break;
t.485L% default: //judge the key and send message
?gH[tN:= break;
b>&kL }
U_Emp[ for(int index=0;index<MAX_KEY;index++){
:q0C$xF if(hCallWnd[index]==NULL)
*.n9D continue;
#oJ9BgDry if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Kc}FMu {
J:5%ff~r\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~KHp~Xs` bProcessed=TRUE;
~Se/uL;* }
xAon:58m{ }
]ZHC*r2i }
SI8mr`gJ else if((lParam&0xc000ffff)==1){ //Key down
H:a(&Zb switch(wParam)
/'!F \ kz {
9Z6O{
> case VK_MENU:
GriL< =?t MaskBits|=ALTBIT;
(B7M*e break;
fW <qp case VK_CONTROL:
.lOEQLt MaskBits|=CTRLBIT;
6 @'v6 1' break;
!NZFo S~ case VK_SHIFT:
V:2|l!l* MaskBits|=SHIFTBIT;
L+9a4/q break;
*-ZJF6 default: //judge the key and send message
pV:X_M6 break;
h8$lDFo }
zT0FTAl^ for(int index=0;index<MAX_KEY;index++)
\; $j
"i& {
oypX.nye_ if(hCallWnd[index]==NULL)
]geO%m continue;
.
p<*n6E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!E4YUEY6 {
`~VV1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
u=p([
5] bProcessed=TRUE;
*=UEx0_!q }
G\ru% }
+p>tO\mo }
QE m6#y if(!bProcessed){
wRi!eN? for(int index=0;index<MAX_KEY;index++){
bt-y6,> +E if(hCallWnd[index]==NULL)
~eA7:dZLb continue;
zxT&K| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jaFBz&P/# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
"b|qyT* Sl }
j^Bo0{{ }
5O]ph[7 }
3K_J"B*7 return CallNextHookEx( hHook, nCode, wParam, lParam );
R*'rg-d }
|z-A;uL < <;=?~QK%- BOOL InitHotkey()
Jx.Jx~ {
FI Io{ru if(hHook!=NULL){
L:}hZf{p* nHookCount++;
/MosE,7l return TRUE;
?qO_t;:0> }
.Q>.|mu else
"6FZX~]s! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
o vvR{MTc if(hHook!=NULL)
W{*U#:Jx1 nHookCount++;
j[F\f> return (hHook!=NULL);
\h!%U*!7{ }
K_G(J> BOOL UnInit()
#||^l_ {
B#OnooJI if(nHookCount>1){
;1'X_tp nHookCount--;
`gDpb.=Y return TRUE;
C-V,3}=*2 }
p$`71w)'[ BOOL unhooked = UnhookWindowsHookEx(hHook);
nxS|] if(unhooked==TRUE){
3-`IMNn! nHookCount=0;
W_Z%CBjcT hHook=NULL;
W.'#pd }
zn@<>o8hU return unhooked;
sn+g#v9e }
!D!~4h) |A0BYzlVc BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V|13%aE_v {
=8?y$WE BOOL bAdded=FALSE;
!ow:P8K? for(int index=0;index<MAX_KEY;index++){
ZX'q-JUv f if(hCallWnd[index]==0){
?
%XTD39 hCallWnd[index]=hWnd;
W8z4<o[$ HotKey[index]=cKey;
>E;kM
B HotKeyMask[index]=cMask;
<2"' R(4", bAdded=TRUE;
MKf|(6;~ KeyCount++;
sC1Mwx break;
%UT5KYd!=N }
]V0V8fU| }
Kkcb'aDR return bAdded;
`<2k.aW4e8 }
d,8L-pT$FM )S@e&a|
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>'ev_eAk {
iO 9.SF0:
BOOL bRemoved=FALSE;
cvxYuP~ for(int index=0;index<MAX_KEY;index++){
b+Sq[ if(hCallWnd[index]==hWnd){
q!iTDg*$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
55q!2>Jh. hCallWnd[index]=NULL;
MdXOH$ps HotKey[index]=0;
=1sGT;> HotKeyMask[index]=0;
.8e]-^Z bRemoved=TRUE;
P1C{G'cR KeyCount--;
-LzkM" break;
\]<eLw-v }
7.)kG}q] }
4PK/8^@7)> }
!iv6k~.e'2 return bRemoved;
6$/Z.8 }
3 @a hN2 [x{z}rYH void VerifyWindow()
=r|e]4 {
q8A ;%.ZLG for(int i=0;i<MAX_KEY;i++){
c"KN;9c, if(hCallWnd
!=NULL){ !]f80z
if(!IsWindow(hCallWnd)){ Ey|{yUmU+
hCallWnd=NULL; d~#B,+
HotKey=0; E? lK(C
HotKeyMask=0; )j,Y(V$P
KeyCount--; T*o!#E.
} gGZ-B<
} ;k?Z,M:
} {%wF*?gk
} @TJxU
nA*Udrcn
BOOL CHookApp::InitInstance() A1Ru&fd!
{ M$u.lI
AFX_MANAGE_STATE(AfxGetStaticModuleState()); izDfpr}s4
hins=AfxGetInstanceHandle(); *kYJwO^
InitHotkey(); 8k{KnH
return CWinApp::InitInstance(); ZLDO&}
} c,CcKy;+
:o3>
int CHookApp::ExitInstance() 1.0:
{ !;3hN$5
VerifyWindow(); <-6f}wN
UnInit(); CdZ. T/x
return CWinApp::ExitInstance(); 0tKVo]EK
} FEH+ PKSc
_V`F_C\\#
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file aT4I sPA?_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9dVHh?E
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ o 9rZ&Q<
#if _MSC_VER > 1000 %W}YtDf\
#pragma once &=*sN`
#endif // _MSC_VER > 1000 q2b>Z6!5
,ZI#p6
class CCaptureDlg : public CDialog 15z(hzU?#
{ |&"/u7^
// Construction 1%$t;R
public: CJjT-(a
BOOL bTray; 2BKiA[
;;
BOOL bRegistered; .[r1Qz7G
BOOL RegisterHotkey(); ::p%R@?
UCHAR cKey; 7@R^B =pb
UCHAR cMask; ?[]jJ
void DeleteIcon(); -x{@D{Q%
void AddIcon(); >*/:"!u
UINT nCount; %I=/
y
void SaveBmp(); NQxx_3*4O
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \kZ@2.pN
// Dialog Data ( Sjlm^bca
//{{AFX_DATA(CCaptureDlg) "8p<NsU
enum { IDD = IDD_CAPTURE_DIALOG }; U3jnH
CComboBox m_Key; ]eUD3WUe>q
BOOL m_bControl; ?bH`
BOOL m_bAlt; mBxMDnh
BOOL m_bShift; b0sj0w /
CString m_Path;
[b+B"f6
CString m_Number; [!C!R$AMa
//}}AFX_DATA ~Ede5Vg!!2
// ClassWizard generated virtual function overrides I<Cm$8O?
//{{AFX_VIRTUAL(CCaptureDlg) ? o&goiM
public: DS+BX`i%#p
virtual BOOL PreTranslateMessage(MSG* pMsg); n/Dg)n?
protected: 194n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Py?e+[cN
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `,O"^zR)z
//}}AFX_VIRTUAL 'C=(?H)M
// Implementation iSX HMp4V
protected: F~0iJnF
HICON m_hIcon; SQ*%d.1
// Generated message map functions *kTj,&x[
//{{AFX_MSG(CCaptureDlg) ly69:TR7I
virtual BOOL OnInitDialog(); S}VN(g
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f,kV
afx_msg void OnPaint(); x:i,l:x
afx_msg HCURSOR OnQueryDragIcon(); P1z:L
virtual void OnCancel(); r:PYAb=g
afx_msg void OnAbout(); \PD%=~
afx_msg void OnBrowse(); #]QS
afx_msg void OnChange(); m7`S@qG
//}}AFX_MSG ecx_&J@D
DECLARE_MESSAGE_MAP() h@]{j_$u
}; S(Z\h_m(
#endif o^/ fr&,9
03AQB;.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file k{'<J(Hb
#include "stdafx.h" I]HLWF
#include "Capture.h" @NiLKcL#
#include "CaptureDlg.h" G0kF[8Am
#include <windowsx.h> m^zD']
#pragma comment(lib,"hook.lib") -]-0]*oAp
#ifdef _DEBUG @=}NMoNH
#define new DEBUG_NEW )y6
#undef THIS_FILE 1;?w#/&t
static char THIS_FILE[] = __FILE__; I FvigDj?
#endif c6 .j$6t
#define IDM_SHELL WM_USER+1 ?9 W2ax-4
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `gF]
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &xvNR=K[`
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YzJWS|]
class CAboutDlg : public CDialog Bio QV47B
{ I.Xbowl
public: t|9vb
CAboutDlg(); CKSs(-hkJ
// Dialog Data ,-kz\N@.
//{{AFX_DATA(CAboutDlg) dQFUQ
enum { IDD = IDD_ABOUTBOX }; S;/pm$?/
//}}AFX_DATA VZe'6?#
// ClassWizard generated virtual function overrides Z%b1B<u$
//{{AFX_VIRTUAL(CAboutDlg) oLtzPC
protected:
_,v>P2)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \ [M4[Qlq
//}}AFX_VIRTUAL AFeFH.G6Jr
// Implementation >L8 &6aU
protected: T!pA$eE
//{{AFX_MSG(CAboutDlg) /1m+iM^V
//}}AFX_MSG >)Bv>HM
DECLARE_MESSAGE_MAP() .
Y$xNLoP[
}; BlM(Q/z
L^PBcfg
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #Uep|A
{ 7Bd=K=3u
//{{AFX_DATA_INIT(CAboutDlg) E$A=*-u
//}}AFX_DATA_INIT IL uQf-
} &os:h]
C
_;/+8=
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _PQk<QZ
{ Au{ b1n
CDialog::DoDataExchange(pDX); }[PC
YnS
//{{AFX_DATA_MAP(CAboutDlg) \IEuu^
//}}AFX_DATA_MAP (dx~lMI
} K|Xe)
$Y\7E/T
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #;+SAoN
//{{AFX_MSG_MAP(CAboutDlg) Q.'2v%i
// No message handlers TTWiwPo59
//}}AFX_MSG_MAP )c 79&S
END_MESSAGE_MAP() ;?TM_%>
;!7M<T$&
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T.B7QAI. H
: CDialog(CCaptureDlg::IDD, pParent) 5^CWF|
{ (yeWArQ
//{{AFX_DATA_INIT(CCaptureDlg) 7osHKO<?2
m_bControl = FALSE; - (q7"h
m_bAlt = FALSE; 7j(gW
m_bShift = FALSE; ux17q>G
m_Path = _T("c:\\"); '$z@40u
m_Number = _T("0 picture captured."); FBOgaI83G
nCount=0; W'Y(@
bRegistered=FALSE; pX$X8z%
bTray=FALSE; eOfVBF<C2
//}}AFX_DATA_INIT L.S/M v
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )(c%QWz
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IJ:JH=8
} cFq2 6(e
.ezZ+@LI+#
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 10GU2a$0"$
{ v0bP|h[t
CDialog::DoDataExchange(pDX); Id>I.e4
//{{AFX_DATA_MAP(CCaptureDlg) dl`{:ZR S
DDX_Control(pDX, IDC_KEY, m_Key); 7&w[h4Lw
DDX_Check(pDX, IDC_CONTROL, m_bControl); 2r]o>X
DDX_Check(pDX, IDC_ALT, m_bAlt); [ L
' >
DDX_Check(pDX, IDC_SHIFT, m_bShift); *_HF %JYMZ
DDX_Text(pDX, IDC_PATH, m_Path); M!%|IKw
DDX_Text(pDX, IDC_NUMBER, m_Number); %ZDO0P !/
//}}AFX_DATA_MAP 8.7lc2aX
} k@gQY _
EN8xn9M?
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?V(+Cc
//{{AFX_MSG_MAP(CCaptureDlg) Qv]rj]%
ON_WM_SYSCOMMAND() 1F+JyZK}w
ON_WM_PAINT() 3BF3$_u)o
ON_WM_QUERYDRAGICON() [F{P0({%?
ON_BN_CLICKED(ID_ABOUT, OnAbout) kP^=
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hrXk 7}9
ON_BN_CLICKED(ID_CHANGE, OnChange) gr# |ZK.`
//}}AFX_MSG_MAP .*J /F$
END_MESSAGE_MAP() \6aisK
"3_GFq
BOOL CCaptureDlg::OnInitDialog() M~+DxnJ=
{ !!cN4X
CDialog::OnInitDialog(); #3A|Z=,5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +c__U
Qx
ASSERT(IDM_ABOUTBOX < 0xF000); 2lqy <o
CMenu* pSysMenu = GetSystemMenu(FALSE); A8:eA
if (pSysMenu != NULL) QiJ
{ 2h)Qz+|7
CString strAboutMenu; 'q@vTM'-
strAboutMenu.LoadString(IDS_ABOUTBOX); FJT0lC
if (!strAboutMenu.IsEmpty()) )l`VE_(|
{ Ry? f; s
pSysMenu->AppendMenu(MF_SEPARATOR); _sY;
dS/
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *>xCX
} ^uPg71r:
} Q8.LlE999
SetIcon(m_hIcon, TRUE); // Set big icon e{*yV#Wl
SetIcon(m_hIcon, FALSE); // Set small icon ofPv?_@
m_Key.SetCurSel(0); }02(Y!Gh
RegisterHotkey(); Wv~&Qh}
CMenu* pMenu=GetSystemMenu(FALSE); n9R0f9:*
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z*9 ke
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m1xR uj]
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5Yww,s
return TRUE; // return TRUE unless you set the focus to a control 8Dn~U:F/?
} 91nw1c!
D_`NCnYG
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Iyb_5 UmpF
{ 1xSG(!
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ff~1>=^
{ Pw5[X5.DX
CAboutDlg dlgAbout; Z#YNL-x
dlgAbout.DoModal(); tg\o"QKW9
} q>5j (,6F
else b`F]oQ_*
{ \xQu*M:!
CDialog::OnSysCommand(nID, lParam); z\woTL6D]
} Ys&)5j-
} 9Hd_sNUu\
yqB!0)
<
void CCaptureDlg::OnPaint() ydAiH*>
{ 2(m#WK7>F
if (IsIconic()) 8;#yXlf
{ l,zhBnD
CPaintDC dc(this); // device context for painting 8 )n g> l
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); o^m?w0 \
// Center icon in client rectangle uL^`uI#I
int cxIcon = GetSystemMetrics(SM_CXICON); @PctBS<s
int cyIcon = GetSystemMetrics(SM_CYICON); d`~~Ww1
CRect rect; Iga#,k+%
GetClientRect(&rect); nd7g8P9p
int x = (rect.Width() - cxIcon + 1) / 2; `*D"=5G+
int y = (rect.Height() - cyIcon + 1) / 2; l@ (:Q!Sk
// Draw the icon +w"?q'SnF
dc.DrawIcon(x, y, m_hIcon); `*U$pg
} / :6|)AW.{
else K/m3
{ rWys'uc
CDialog::OnPaint(); EcIE~qs
} dpQG[vXe
} ?oZR.D|SZ
HS'Vi9
HCURSOR CCaptureDlg::OnQueryDragIcon() 1}hIW":3Sr
{ o:Qv
JcB
return (HCURSOR) m_hIcon; kdz=ltw
} 9[!,c`pw
}(a+aHH
void CCaptureDlg::OnCancel() $VAx:Y|
{ G;>
_<22
if(bTray) Nu8Sr]p
DeleteIcon(); 2._X|~0a
CDialog::OnCancel(); VxP&j0M>
} wB'zuPAK6
8x`.26p
void CCaptureDlg::OnAbout() %h1N3\y9i(
{ I%|>2}-_U
CAboutDlg dlg; dd2[yKC`
dlg.DoModal(); (E,T#uc{
} zf3v5Hk
2Q;9G6p
void CCaptureDlg::OnBrowse() 'B+ ' (f
{ rt
JtK6t
CString str; nRd)++
BROWSEINFO bi; </uOe.l>Q
char name[MAX_PATH]; B^).BQ
ZeroMemory(&bi,sizeof(BROWSEINFO)); CJ}5T]WZ
bi.hwndOwner=GetSafeHwnd(); keRE==(D
bi.pszDisplayName=name; }kg ye2[
bi.lpszTitle="Select folder"; VDTcR
bi.ulFlags=BIF_RETURNONLYFSDIRS; XMG]Wf^%\<
LPITEMIDLIST idl=SHBrowseForFolder(&bi); d1[ZHio2c?
if(idl==NULL) hsu{ey p
return; s3Cc;#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Dk48@`l2
str.ReleaseBuffer(); 8p[)MiC5W^
m_Path=str; ){jla,[
if(str.GetAt(str.GetLength()-1)!='\\') x@8a''
m_Path+="\\"; NnVnUgx
UpdateData(FALSE); fNGZ o
} E7-@&=]v
g^zs,4pPU<
void CCaptureDlg::SaveBmp() G:g69=x y
{ @k&qb!Qah
CDC dc; A 7[:5$
dc.CreateDC("DISPLAY",NULL,NULL,NULL); .F+@B\A<
CBitmap bm; uwlr9nB
int Width=GetSystemMetrics(SM_CXSCREEN); X$/2[o#g
int Height=GetSystemMetrics(SM_CYSCREEN); YJ$1N!rG
bm.CreateCompatibleBitmap(&dc,Width,Height); e}1uz3Rh
CDC tdc; ws4cF
N9P?
tdc.CreateCompatibleDC(&dc); ]l8^KX'
CBitmap*pOld=tdc.SelectObject(&bm); |JCU<_<
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k{t`|BnPKB
tdc.SelectObject(pOld); Z0l+1iMx
BITMAP btm; w&ak"GgV
bm.GetBitmap(&btm); Y3Q9=u*5
DWORD size=btm.bmWidthBytes*btm.bmHeight; sH\5/'?
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `-LGU7~+
BITMAPINFOHEADER bih; )=Jk@yj8x
bih.biBitCount=btm.bmBitsPixel; 6-O_\Cq8
bih.biClrImportant=0; 5h; +Ky!I
bih.biClrUsed=0; mc4i@<_?
bih.biCompression=0; rx}r~0i
bih.biHeight=btm.bmHeight; m8.U &0
bih.biPlanes=1; ;| 1$Q!4
bih.biSize=sizeof(BITMAPINFOHEADER); y|wc,n%L>
bih.biSizeImage=size; Sfdu`MQR
bih.biWidth=btm.bmWidth; kBN+4Dr/$
bih.biXPelsPerMeter=0; :,)lm.}]t
bih.biYPelsPerMeter=0; H=
X|h)
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1@$Ko5
static int filecount=0; )m. 4i =X
CString name; qgrg CJ
name.Format("pict%04d.bmp",filecount++); m4*@o?Ow
name=m_Path+name; MHa#?Q9
BITMAPFILEHEADER bfh; 3h<,
bfh.bfReserved1=bfh.bfReserved2=0; mx=BD'
bfh.bfType=((WORD)('M'<< 8)|'B'); tor!Dl@Mo
bfh.bfSize=54+size; ,cqF3
bfh.bfOffBits=54; xMBaVlEN
CFile bf; TiH)5
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~zw]5|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); GAAm0;
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); nl9P,
d
bf.WriteHuge(lpData,size); 5scEc,JCi
bf.Close(); t]e;;q=L.
nCount++; 9H%X2#:fH
} Gw1@KKg
GlobalFreePtr(lpData); #BSTlz
if(nCount==1) 7hcNf,
m_Number.Format("%d picture captured.",nCount); gmm.{%1_I;
else iJ~Vl"|m
m_Number.Format("%d pictures captured.",nCount); FJd]D[h
UpdateData(FALSE); ZIF49`Y4TF
} n..g~$k
Sr?#S
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y5j]Z^^v
{ *<!oHEwkN
if(pMsg -> message == WM_KEYDOWN) )Dz+X9;g+
{ )Qvk*9OS
if(pMsg -> wParam == VK_ESCAPE) x]33LQ1]
return TRUE; \!ej<T+JR>
if(pMsg -> wParam == VK_RETURN) Rx+p.
return TRUE; ]EpWSs!"g
} /g4f`$a
return CDialog::PreTranslateMessage(pMsg); =ha{Ziryo
} b2FO$Os
o-Ga3i 8
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "V}[':fen
{ 2J;kSh1,L
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G2FXrkU
SaveBmp(); Nj 00W1
return FALSE; +="e]Yh;
} jfqopiSi
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @qHNE,K
CMenu pop; "T- `$'9
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #KiRfx4G
CMenu*pMenu=pop.GetSubMenu(0); E^SH\5B
pMenu->SetDefaultItem(ID_EXITICON); 'Un" rts
CPoint pt; x>Jr_A(
GetCursorPos(&pt); ]S5JUAGkE*
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); AoI/n4T^
if(id==ID_EXITICON) )d>!"JB-
DeleteIcon(); aVd,xl
else if(id==ID_EXIT) z'EajBB\f
OnCancel(); "^]cQ"A
return FALSE; TU
1I} ,
} (/j); oSK
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o+$7'+y1n-
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b 'pOJS
AddIcon(); ,c)uX#1
return res; QD>"]ap,o
} SE~[bT
'>rw(3
void CCaptureDlg::AddIcon() 9,r rQQD_
{ xcf%KXJf6
NOTIFYICONDATA data; |UxG $M(
data.cbSize=sizeof(NOTIFYICONDATA); mFZ?hOyP.
CString tip; L~NbdaO
tip.LoadString(IDS_ICONTIP); n= u&uqA*
data.hIcon=GetIcon(0); AlIpsJ[UU
data.hWnd=GetSafeHwnd();
MEGv}
strcpy(data.szTip,tip); UTH_^HAN#G
data.uCallbackMessage=IDM_SHELL; n0e1k.A
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W0]gLw9*
data.uID=98; dp*u9z~NA
Shell_NotifyIcon(NIM_ADD,&data); 9BuSN*4
ShowWindow(SW_HIDE); /x1![$oC0
bTray=TRUE; u[
Yk
} =^5Alba/
m-*hygkcDu
void CCaptureDlg::DeleteIcon() eXf22;Lz
{ iB& 4>+N+
NOTIFYICONDATA data; wLOB}ZMT
data.cbSize=sizeof(NOTIFYICONDATA); H,u<|UMM_
data.hWnd=GetSafeHwnd(); Rw:*'1
data.uID=98; G8Y<1%`<
Shell_NotifyIcon(NIM_DELETE,&data); LpqO{#ZG
ShowWindow(SW_SHOW); SF<c0bR9
SetForegroundWindow(); _c_[C*T]
ShowWindow(SW_SHOWNORMAL); 9uA>N
bTray=FALSE; cj'}4(
} #odI EC/
7*Ej. HK
void CCaptureDlg::OnChange() "pRtczxOgR
{ YS *9t
Q{
RegisterHotkey(); Nqa&_5"
} l.NEkAYPmH
4k@5/5zsM
BOOL CCaptureDlg::RegisterHotkey() 'GS"8w~j
{ ?}U(3
UpdateData(); ub\MlSr
UCHAR mask=0; <y NM%P<Oy
UCHAR key=0; |~vI3]}fx
if(m_bControl) YLzx<~E4a
mask|=4; l)&X$3? tz
if(m_bAlt) jGpN,/VQa
mask|=2; +N:o-9
if(m_bShift) 9#MBaO8_"
mask|=1; ne_TIwf w-
key=Key_Table[m_Key.GetCurSel()]; n4R(.N00
if(bRegistered){ O%5
r[
DeleteHotkey(GetSafeHwnd(),cKey,cMask); .xm.DRk3
bRegistered=FALSE; .@@?Pj?)
} !FElW`F
cMask=mask; AN/;)wc
cKey=key; ='s(|
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #x 177I\
return bRegistered; |6K+E6H
} O\"3J(y,
:?g:~+hfO
四、小结 G <i@ 5\#
rPLm5ni
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。