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:
IZ/+RO n
>:WnCkbp 一、实现方法
o[X'We; !ffdeWHR 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:
{%*,KB>b ?Mtd3F^o? #pragma data_seg("shareddata")
OW;]=k/( HHOOK hHook =NULL; //钩子句柄
:2vk
vLM UINT nHookCount =0; //挂接的程序数目
4cDjf~n static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
_SY4Qs`d static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
1:(qoA: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
R.-2shOE' static int KeyCount =0;
Kf/1;:^ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
fYBmW') #pragma data_seg()
07`hQn)Gc 8>%:MS" 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。
$hXhq*5|c W1fEUVj DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
@@M
2s( JHC 6l BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Yi1lvB?m cKey,UCHAR cMask)
]3nka$wA* {
jvv3;lWDL. BOOL bAdded=FALSE;
dI};l for(int index=0;index<MAX_KEY;index++){
kZ~ 0fw- if(hCallWnd[index]==0){
<b!nI
N hCallWnd[index]=hWnd;
qbrY5;U HotKey[index]=cKey;
-PPH]?], HotKeyMask[index]=cMask;
t"4RGO)jh bAdded=TRUE;
yhxen KeyCount++;
V(u#8M break;
a\;Vly; }
GgwO>[T }
;6P#V`u return bAdded;
=:Ahg
9 }
,rc?,J1l //删除热键
o."k7fLB BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
84 5a%A$ {
w/&)mm{ BOOL bRemoved=FALSE;
dNK Q&TC for(int index=0;index<MAX_KEY;index++){
$R6iG\V5 if(hCallWnd[index]==hWnd){
++1<A&a if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
vkUXMMuf+e hCallWnd[index]=NULL;
T%zCAfx m HotKey[index]=0;
>U. HotKeyMask[index]=0;
Ad$CHx- bRemoved=TRUE;
rKxIOJ ,T KeyCount--;
0N9`WK break;
t+y$i@R: }
trlZ ^K }
:4Jq T|nS }
#y;TSHx/ return bRemoved;
nIc:<w] }
X)6}<A NX.%Rj* D_kz'0^| DLL中的钩子函数如下:
,6TF]6: (OS -v~{r@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/6S% h-#\ {
su:~Xd BOOL bProcessed=FALSE;
D#"BY;
J if(HC_ACTION==nCode)
YNHQbsZUI, {
_:"PBN9 if((lParam&0xc0000000)==0xc0000000){// 有键松开
}Rl^7h<! switch(wParam)
2yB)2n#ut {
J5Pi"U$FkY case VK_MENU:
&ed&2t`Y MaskBits&=~ALTBIT;
FVY$A=G break;
b~$B0o) case VK_CONTROL:
$r> $
u MaskBits&=~CTRLBIT;
Qg9*mlm` break;
5@ c/,6l case VK_SHIFT:
EY+/
foP MaskBits&=~SHIFTBIT;
QEtf-xNn^ break;
F/8="dM default: //judge the key and send message
I'sq0^ break;
`eZ
+Pf". }
{9mXJu$cc for(int index=0;index<MAX_KEY;index++){
V/N:Of:\R if(hCallWnd[index]==NULL)
lSW6\jX continue;
={'*C7K)oK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GTYCNi66 {
9c p jO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
o4Ny9s bProcessed=TRUE;
VT@,RlB0 }
4DLp+6zP }
skSs|slp }
Dqxtc|vo else if((lParam&0xc000ffff)==1){ //有键按下
Gz09#nFZk switch(wParam)
C6<*'5T {
hKx*V"7/#\ case VK_MENU:
PeU>h2t MaskBits|=ALTBIT;
%5 [,U)X" break;
=@ SJyW case VK_CONTROL:
yLFZo"r MaskBits|=CTRLBIT;
$RASpM break;
Nj5V" c case VK_SHIFT:
0XgJCvMcB MaskBits|=SHIFTBIT;
+O]jklS4H break;
J~jxmh default: //judge the key and send message
O8\> ?4) break;
}8lvi
vR4 }
c>~q2_}W( for(int index=0;index<MAX_KEY;index++){
n7EG%q6m+ if(hCallWnd[index]==NULL)
HLL:nczj continue;
!\'NBq, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#saK8; tp {
='rSB.$Ctk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
@Yzdq\FI bProcessed=TRUE;
GF^)](xY+ }
E`A6GX }
sLHUQ(S! }
(Ci{fY6` if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
!<EQVqj6 for(int index=0;index<MAX_KEY;index++){
!PySYY if(hCallWnd[index]==NULL)
LvM;ZfAEv continue;
;~^9$Z@%Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
JkfVsmc<{h SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
j:Y1 //lParam的意义可看MSDN中WM_KEYDOWN部分
JXhHitUD }
jWUpzf)q=T }
K-<kp!v }
1J{1>r return CallNextHookEx( hHook, nCode, wParam, lParam );
?^X
e^1( }
%B#(d)T*- 7RpAsLH= 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:
'B"A*!"b &x
mYp Q BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G=VbEL^H BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
>du _/*8: =!R+0 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:
|0wHNRN_ !kpnBgm U LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
^7p>p8 {
<jjn'*44f if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
q8=hUD%5C {
#Rw9Iy4 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
P}2waJe SaveBmp();
[(81-j1v return FALSE;
.[Hv/?L }
H)@f_pfj( …… //其它处理及默认处理
g~/@`Z2Y }
_T^+BUw 12olVTuw Cg]Iz<<bE 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。
MYk%p' GEd JB= 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。
^#0k\f>_ h%=>iQ%enc 二、编程步骤
Shag4-*@hi v:xfGA nP 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";
^_0l(ke xRiWg/Z~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
.ou#BWav/ 0*4h}t9j 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;
"Vw;y+F} BIK^<_?+ZU 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;
;zpSyyp@ lk[BS* 5、 添加代码,编译运行程序。
WF&?OHf2 IPTEOA<M[ 三、程序代码
q\I2lZ 3[ T<pAZ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?c7}
v #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
]ysEj3 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
,x]xtg? #if _MSC_VER > 1000
wMx#dP4W8 #pragma once
2c u?2_, #endif // _MSC_VER > 1000
3B^`xnV #ifndef __AFXWIN_H__
kCVO!@yZz #error include 'stdafx.h' before including this file for PCH
^DaP^<V #endif
I<}<!.Bc! #include "resource.h" // main symbols
<q<kqy5s-R class CHookApp : public CWinApp
,bU8S\8 {
p2)563#RS public:
4r+s"
| CHookApp();
&X%vp?p // Overrides
E4;@P']` // ClassWizard generated virtual function overrides
{zmh0c;| //{{AFX_VIRTUAL(CHookApp)
#CcC& I
:c public:
w1q` virtual BOOL InitInstance();
b$,~S\\c
virtual int ExitInstance();
K:_5#!*^98 //}}AFX_VIRTUAL
#y2IHO- //{{AFX_MSG(CHookApp)
]A]EED.ZH // NOTE - the ClassWizard will add and remove member functions here.
g/_j"Nn // DO NOT EDIT what you see in these blocks of generated code !
]$=\zL //}}AFX_MSG
] l@Mo7|w DECLARE_MESSAGE_MAP()
'G|M_ e };
)^q7s&p/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
_
!r]** BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
GyP.;$NHa[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7#G8qh< BOOL InitHotkey();
na)-' BOOL UnInit();
EsK.g/d #endif
-&UP[Mq by0@G"AE+ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
#l<un< #include "stdafx.h"
9irT}e #include "hook.h"
tOEY| #include <windowsx.h>
mcgkNED #ifdef _DEBUG
\])-Bp, #define new DEBUG_NEW
\(g/::| #undef THIS_FILE
%c`P`~sp static char THIS_FILE[] = __FILE__;
3;t {V$ #endif
fZ7Ap3dmP #define MAX_KEY 100
4eh~/o&h #define CTRLBIT 0x04
W5c?f, #define ALTBIT 0x02
y2=`NG= #define SHIFTBIT 0x01
k&dLg5O #pragma data_seg("shareddata")
O3];1ud HHOOK hHook =NULL;
1Bl;.8he.) UINT nHookCount =0;
z<h?WsL static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
O
S% static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
{!]7=K)W9 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
-l2aAK1M static int KeyCount =0;
J 6%CF2 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
uNoP8U%* #pragma data_seg()
t_\;G~O9-M HINSTANCE hins;
R{3vPG void VerifyWindow();
6&qT1nF1
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Kx<T;iJ} //{{AFX_MSG_MAP(CHookApp)
<GRplkf` // NOTE - the ClassWizard will add and remove mapping macros here.
gfU@`A_N" // DO NOT EDIT what you see in these blocks of generated code!
$6Az\Iu * //}}AFX_MSG_MAP
+.Cx.Nf( END_MESSAGE_MAP()
S`?L\R.: 6U!zc]> CHookApp::CHookApp()
: l&g5 {
-z6{! // TODO: add construction code here,
e4rhB"qQdn // Place all significant initialization in InitInstance
3{"M N= }
fx#Krr@ R&P}\cf8T CHookApp theApp;
Ao}J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
X`'
@G {
C(jUM!m BOOL bProcessed=FALSE;
7!kbe2/]' if(HC_ACTION==nCode)
<JkmJ/X {
}u9wD08x if((lParam&0xc0000000)==0xc0000000){// Key up
8Vf]K}d switch(wParam)
2n3g!M6~ {
[e.@Yx_} case VK_MENU:
"eOFp\vPr MaskBits&=~ALTBIT;
c'Mi9,q break;
L4) case VK_CONTROL:
[:Y`^iR. MaskBits&=~CTRLBIT;
RX6s[uQ break;
S1&Df%Ra case VK_SHIFT:
Du7DMo=l MaskBits&=~SHIFTBIT;
o+F]80CH break;
y%NZ(Y,v default: //judge the key and send message
Ph Ep3o&" break;
@9ndr$t }
*<rBV`AP for(int index=0;index<MAX_KEY;index++){
n `Ry! if(hCallWnd[index]==NULL)
Vh o3I[C continue;
3`3`iN!8\@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_G1C5nkDl4 {
?loP18S
b SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
xzrA%1y bProcessed=TRUE;
s ;N PY }
XkE'k;AEx }
Z.x9SEe1t }
gPYF2m else if((lParam&0xc000ffff)==1){ //Key down
%`b
%TH^ switch(wParam)
_`LQnRp( {
F?EAIL case VK_MENU:
=xX)2h MaskBits|=ALTBIT;
![}q9aeT break;
}_GI%+t case VK_CONTROL:
P S [ifC MaskBits|=CTRLBIT;
s?-J`k~q break;
;VlA~tv case VK_SHIFT:
tuWJj^ MaskBits|=SHIFTBIT;
WiBO8N,%` break;
pjaDtNb default: //judge the key and send message
)cUFb:D*" break;
>ngP\&\ }
8<X,6 for(int index=0;index<MAX_KEY;index++)
VzZ'W[/7)B {
5L% \rH&N if(hCallWnd[index]==NULL)
4y$tp18 continue;
2C@s-`b if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
q\q8xF~[p {
6OLp x)fG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
x+B7r&#: bProcessed=TRUE;
NJ ];Ck }
8/oO}SLF }
l:?w{'i$ }
[flx/E if(!bProcessed){
;wF 0s for(int index=0;index<MAX_KEY;index++){
SZ )AO8& if(hCallWnd[index]==NULL)
8e{S(FZ7Ed continue;
,4`=gKn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>56I`[) SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
!T3b]0z }
//W7$DYEG }
1GA$nFBVC }
F9\T< return CallNextHookEx( hHook, nCode, wParam, lParam );
m.0:R }
fO'"UI PW)Gd +y BOOL InitHotkey()
+`D,7"{Eu {
\cKY{(E if(hHook!=NULL){
R-\a3q nHookCount++;
FvTc{"w / return TRUE;
W!.vP~ > }
6r3.%V.& else
LH_rc hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
+#Q\;;FNP if(hHook!=NULL)
`eXTVi|0"~ nHookCount++;
&Bfgvws; return (hHook!=NULL);
l*(Ml=
O{ }
.W/#$s|X\ BOOL UnInit()
N# ?}r>W3 {
.{}=!>U2 if(nHookCount>1){
h:qt?$]J nHookCount--;
hI Q 2s
return TRUE;
|2'u@<(Z/ }
q` Z_Bw BOOL unhooked = UnhookWindowsHookEx(hHook);
DE659=Tq if(unhooked==TRUE){
h|Z%b_a nHookCount=0;
/%4wm?(eA hHook=NULL;
E!_mXjlPc }
+T|M U return unhooked;
>3\($<YDZM }
LFHzd@Y7" 5UU1HC;C BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
YA,vT[kX {
TcjTF|q> BOOL bAdded=FALSE;
piv/QP-X for(int index=0;index<MAX_KEY;index++){
`$hna{e^n if(hCallWnd[index]==0){
!Ic{lB hCallWnd[index]=hWnd;
3LK]VuZE HotKey[index]=cKey;
^xZ o.P HotKeyMask[index]=cMask;
T)Ohk(jK1 bAdded=TRUE;
|gP9^B?3 KeyCount++;
Hvj1R.I/ break;
R<-u`uXnP }
pA|Z%aL }
E` O@UW@ return bAdded;
C % d }
d \[cFe1d /j|Rz5@= BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F[HMX4 {
CRKuN BOOL bRemoved=FALSE;
w!8xZu for(int index=0;index<MAX_KEY;index++){
,dZ&i!@? if(hCallWnd[index]==hWnd){
S="teH[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
NrTK+6 z hCallWnd[index]=NULL;
e_iXR#bZc HotKey[index]=0;
yi-S^ HotKeyMask[index]=0;
=:~%$5[[ bRemoved=TRUE;
}g@5%DI] KeyCount--;
yv&VK ht break;
sb^%eUU]) }
SmR"gu }
Y%"6 }
@2HNYW) return bRemoved;
0w24lVR. }
4PsJs<u RXZ}aX[h void VerifyWindow()
n:i?4'-} {
XX])B%* for(int i=0;i<MAX_KEY;i++){
=^L?Sgg if(hCallWnd
!=NULL){ (ZI11[e{
if(!IsWindow(hCallWnd)){ ^ .]]0Rp&
hCallWnd=NULL; g*uo2-MN&e
HotKey=0; sh|@X\EZO
HotKeyMask=0; aLKvl~s;m
KeyCount--; GLIe8T*ht
} N9s ,..
} H|]~(.w 1}
} vI)-Zz[3
} J#L"kz
M1sR+e$"
BOOL CHookApp::InitInstance() p~h)@
{ ={GYJ.*Ah
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ejID5NqG
hins=AfxGetInstanceHandle(); t(,_
InitHotkey(); Ry+Ax4#+(y
return CWinApp::InitInstance(); Ie14`'
} hrt]Qn&
Cc7YjsRW
int CHookApp::ExitInstance() P{{pp<tX*&
{ K}(0H [P
VerifyWindow(); fQtV-\Bc
UnInit(); -55Pvg0ND
return CWinApp::ExitInstance(); 68pB*(i
} "N|gU;~W
$2?10}mrx
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \@ jYY~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $u`v
k|\R
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4z$}e-
#if _MSC_VER > 1000 yhBf %m
#pragma once a/(IvOy#6
#endif // _MSC_VER > 1000 /%'>?8/
@&7|Laa
class CCaptureDlg : public CDialog zURob MpE#
{ 6)QJms
// Construction 'W>Zr}:
public: iTgv8
BOOL bTray; :mpR}.^hv
BOOL bRegistered; .^Z^L F
BOOL RegisterHotkey(); .gPXW=r
UCHAR cKey; v;r!rZX
UCHAR cMask; mnwYv..ePz
void DeleteIcon(); LZ"yMnhOf
void AddIcon(); W%)uKQha
UINT nCount; eb uR-9
void SaveBmp(); Ki"o0u
CCaptureDlg(CWnd* pParent = NULL); // standard constructor $xWebz0
// Dialog Data :())%Xu3
//{{AFX_DATA(CCaptureDlg) qg(rG5kD@
enum { IDD = IDD_CAPTURE_DIALOG }; h)vRvfcmY
CComboBox m_Key;
YjV-70'
BOOL m_bControl; e=]>TeqG0
BOOL m_bAlt; xK3
xiR
BOOL m_bShift; 0."TSe83\
CString m_Path; h.`U)6*?&N
CString m_Number; XehpW}2\
//}}AFX_DATA @7C?]/8#
// ClassWizard generated virtual function overrides o,#[Se*n
//{{AFX_VIRTUAL(CCaptureDlg) D m|_;iO,
public: %S2^i3
virtual BOOL PreTranslateMessage(MSG* pMsg); /%fa_+,|-
protected: 0%9Nf!j
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iyRB}[y
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .Y?/J,Ch
//}}AFX_VIRTUAL AxXFzMW
// Implementation .7!n%Ks
protected: le*1L8n$'
HICON m_hIcon; NvZ )zE
// Generated message map functions axRzn:f
//{{AFX_MSG(CCaptureDlg) k>N >_{\
virtual BOOL OnInitDialog(); Pd,+=
ML
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); eTV%+
afx_msg void OnPaint(); Mk*&CNo3
afx_msg HCURSOR OnQueryDragIcon(); Zv`j+b
virtual void OnCancel(); +&w=*IAKZ
afx_msg void OnAbout(); jf_0IE
afx_msg void OnBrowse(); e2SU)Tr%b
afx_msg void OnChange(); |+ ^-b}0
//}}AFX_MSG fCA/
DECLARE_MESSAGE_MAP() *=- o0 c
}; T%%+v#+
#endif E>BP b
f-V8/
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D~;hIt*
#include "stdafx.h" 0NN{2"M$p
#include "Capture.h" Mbt}G|;8H7
#include "CaptureDlg.h" I1H} 5bf3
#include <windowsx.h> >UP{=`
#pragma comment(lib,"hook.lib") X>n\@rTo
#ifdef _DEBUG B" -gK20vY
#define new DEBUG_NEW :uAW
#undef THIS_FILE s[V$fvW
static char THIS_FILE[] = __FILE__; <By6%<JTn
#endif p8>.Q/4
#define IDM_SHELL WM_USER+1 ?D].Za^km
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Pgy&/-u
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MZ(TST"
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; q+MV@8w
class CAboutDlg : public CDialog M>mk=-l
{ v}=3
public: b9ON[qOMN
CAboutDlg(); {\OIowa
// Dialog Data @$5GxIw<l
//{{AFX_DATA(CAboutDlg) e$k]z HlQ
enum { IDD = IDD_ABOUTBOX }; >bf29tr
//}}AFX_DATA 0 L34)W
// ClassWizard generated virtual function overrides -XVC,.Ly
//{{AFX_VIRTUAL(CAboutDlg) hSgfp
protected: ZWC-<QO"<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6,"fH{Bd
//}}AFX_VIRTUAL ^lqcF.
// Implementation }`oe<|
protected: [TZlvX(E
//{{AFX_MSG(CAboutDlg) y\'t{>U/
//}}AFX_MSG FkdG@7Xf
DECLARE_MESSAGE_MAP() @quNVx(y
}; 58H [sM4>
^y?7B_%:B#
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wff&ci28
{ $B6"fYiDk
//{{AFX_DATA_INIT(CAboutDlg) k,L ,
//}}AFX_DATA_INIT
uC3o@qGW<
} [69[Ct
\#(cI
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;&2J9
{ n7RswX
CDialog::DoDataExchange(pDX); `?Pk~7
//{{AFX_DATA_MAP(CAboutDlg) Y$%/H"1bk
//}}AFX_DATA_MAP Wgl7)Xk.)
} `<Z5/;a5W
#clPao?r
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) q16RPqfT
//{{AFX_MSG_MAP(CAboutDlg) G>?hojvi
// No message handlers w_po5[]R
//}}AFX_MSG_MAP |kvom 4 T
END_MESSAGE_MAP() |bQX9|L
,x| 4nk_
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wVvk{tS
: CDialog(CCaptureDlg::IDD, pParent) pV:c`1\`
{ d}K"dr:W5
//{{AFX_DATA_INIT(CCaptureDlg) SRl:+!@.
m_bControl = FALSE; |-N\?N9"
m_bAlt = FALSE; &zsaVm8
m_bShift = FALSE; 7xP>AU)y
m_Path = _T("c:\\"); s(Of
EzsH=
m_Number = _T("0 picture captured."); 3K2`1+kBVG
nCount=0; #zC_;u$
bRegistered=FALSE; P8K{K:T
bTray=FALSE; J4qFU^
//}}AFX_DATA_INIT \(t.|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QE&rpF7l{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); PaF`dnJ
} )%q]?@kB
FbB>
Md;
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) mie<jha
{ tBgB>-h(
CDialog::DoDataExchange(pDX); :CO>g=`
//{{AFX_DATA_MAP(CCaptureDlg) >]q{vKCAP
DDX_Control(pDX, IDC_KEY, m_Key); )v1n#m,W
DDX_Check(pDX, IDC_CONTROL, m_bControl); ':8yp|A|
DDX_Check(pDX, IDC_ALT, m_bAlt); >Vr+\c
DDX_Check(pDX, IDC_SHIFT, m_bShift); zbdmz
DDX_Text(pDX, IDC_PATH, m_Path); #C1u~db
DDX_Text(pDX, IDC_NUMBER, m_Number); }EmNSs`$r
//}}AFX_DATA_MAP 6P=6E
} VLW<"7I 6\
0c4H2RW
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i]8HzKuiW
//{{AFX_MSG_MAP(CCaptureDlg) Rh-e
C6P
ON_WM_SYSCOMMAND() f&glY`s#
ON_WM_PAINT() `;-K/)/x
ON_WM_QUERYDRAGICON() 7aVQp3<
ON_BN_CLICKED(ID_ABOUT, OnAbout) 1hj']#vBu
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4I7}
ON_BN_CLICKED(ID_CHANGE, OnChange) >HatbbA
//}}AFX_MSG_MAP &MnS(
82L
END_MESSAGE_MAP() >3V{I'^^-
$:V'+s4o
BOOL CCaptureDlg::OnInitDialog() h#9X0u7j
{ [z$th
CDialog::OnInitDialog(); OD!b*Iy|
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2xvTijO0
ASSERT(IDM_ABOUTBOX < 0xF000); Qvh: hkR
CMenu* pSysMenu = GetSystemMenu(FALSE); y^:!]-+
if (pSysMenu != NULL) WpE\N0Yg
{ bX%9'O [-
CString strAboutMenu; H8+7rM
strAboutMenu.LoadString(IDS_ABOUTBOX); /t`s.!k
if (!strAboutMenu.IsEmpty()) lz.ta!6
{ MXsSF|-
pSysMenu->AppendMenu(MF_SEPARATOR); 0R&$P6
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b f.__3{
} 5LU8QHj3
} ;
F% 3b47
SetIcon(m_hIcon, TRUE); // Set big icon nZe2bai
SetIcon(m_hIcon, FALSE); // Set small icon bD[W`yW0
m_Key.SetCurSel(0); s^F6sXhyPi
RegisterHotkey(); W' w;cy:H
CMenu* pMenu=GetSystemMenu(FALSE); 1w}%>e-S
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eO#Kn'5
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6m_
fEkS[
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); X(Gp3lG
return TRUE; // return TRUE unless you set the focus to a control :,03)[u{8
} &U%AVD[
?s[ kUv+=
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uc]]zI6
{ -ju&"L B
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1e.V%!Xk
{ ,h,DB=!K<
CAboutDlg dlgAbout; /1ZRjf^
dlgAbout.DoModal(); cl
kL)7RQ
} Lu,72i0O ^
else Tg|0!0qD]F
{ zKB$n.H
CDialog::OnSysCommand(nID, lParam); 2TB>d+
} ssGp:{]v/
} e ?FjN 9
33dHTV
void CCaptureDlg::OnPaint() BH"f\oc
{ wlk{V
if (IsIconic()) mm(Ff >O
{ mOG;[CB
CPaintDC dc(this); // device context for painting \^O&){q(9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4lMf'V7*l
// Center icon in client rectangle K
TJm[44
int cxIcon = GetSystemMetrics(SM_CXICON); U^iNOMs?
int cyIcon = GetSystemMetrics(SM_CYICON); K*^3FO}JG
CRect rect; CN4Q++{
GetClientRect(&rect); JgQ,,p_V?
int x = (rect.Width() - cxIcon + 1) / 2; 4X tIMa28
int y = (rect.Height() - cyIcon + 1) / 2; EaaLN<i@0
// Draw the icon : p# 5nYi
dc.DrawIcon(x, y, m_hIcon); ' jAX&7G`
} qKu/~0a/
else J{fTx@?(
{ 7.Df2_)
CDialog::OnPaint(); .YYfba#{
} ,@1rP 55
} ZoJ_I
>uv
r'!L}^n
HCURSOR CCaptureDlg::OnQueryDragIcon() [\eh$r\
{ -I
dW-9~9
return (HCURSOR) m_hIcon; Gf` `0F)
} r ]JV!'R
jpijnz{M
void CCaptureDlg::OnCancel() @@->A9'L
{ fS9TDy
if(bTray) `5da
DeleteIcon(); <r 2$k"*:
CDialog::OnCancel(); ?wM{NVt#-
} Msj(>U&}+
ejs_ ?
void CCaptureDlg::OnAbout() %l{0z<
{ =^a Ngq
CAboutDlg dlg; .d
mUh-
dlg.DoModal(); CshYUr -
} [_kis
NVyel*QE
void CCaptureDlg::OnBrowse() v+\&8)W=
{ ->"Z1
CString str; `^_c&y K
BROWSEINFO bi; 2z*EamF
char name[MAX_PATH]; #6okd*^
ZeroMemory(&bi,sizeof(BROWSEINFO)); B?M&j
bi.hwndOwner=GetSafeHwnd(); Q8d-yJs&
bi.pszDisplayName=name; '0ks`a4q
bi.lpszTitle="Select folder"; >+}yI}W;e
bi.ulFlags=BIF_RETURNONLYFSDIRS; E}-Y!,v^
LPITEMIDLIST idl=SHBrowseForFolder(&bi); j >pv@D
if(idl==NULL) )?d(7d-l
return; Qdt4h$~V"
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3+:F2sjt
str.ReleaseBuffer(); s>pM+PoGYd
m_Path=str; ^HiI
if(str.GetAt(str.GetLength()-1)!='\\') EhWYFQ
m_Path+="\\"; y}5:CZ
UpdateData(FALSE); ULT,>S6r
} t[=-4;
^&[Z@*A8#
void CCaptureDlg::SaveBmp() dMw7UJ
{ Ec2?'*s
CDC dc; :X+!W_xR
dc.CreateDC("DISPLAY",NULL,NULL,NULL); QVT|6znw
CBitmap bm; #E`wqI\'
int Width=GetSystemMetrics(SM_CXSCREEN); Ec3TY<mVr
int Height=GetSystemMetrics(SM_CYSCREEN); #!yW)RG
bm.CreateCompatibleBitmap(&dc,Width,Height); 5`>%{ o
CDC tdc; rl/]Ym4j
tdc.CreateCompatibleDC(&dc); pc+'/~
CBitmap*pOld=tdc.SelectObject(&bm); ,M?K3lG\g[
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *OM+d$l!
tdc.SelectObject(pOld); >^!)G^B
BITMAP btm; 6j2mr6o
bm.GetBitmap(&btm); J?y0RX
DWORD size=btm.bmWidthBytes*btm.bmHeight; 8?l/x
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yq6Gyoi<
BITMAPINFOHEADER bih; TmEJ!)*
bih.biBitCount=btm.bmBitsPixel; m7$t$/g
bih.biClrImportant=0; Gf<f#.5y
,
bih.biClrUsed=0; eVRPjVzQ'Q
bih.biCompression=0; 9_Ws8nE
bih.biHeight=btm.bmHeight; ,SV34+(
bih.biPlanes=1; P >>VBh?
bih.biSize=sizeof(BITMAPINFOHEADER); qT153dNA&
bih.biSizeImage=size; EX"o9'
bih.biWidth=btm.bmWidth; k`(Cwp{Oc
bih.biXPelsPerMeter=0; r)]8zK4;=
bih.biYPelsPerMeter=0; #_pQS}$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9YQYg@+R
static int filecount=0; x?6
\C-i
CString name; br3r!Vuz/-
name.Format("pict%04d.bmp",filecount++); fVvB8[(;~
name=m_Path+name; bCfw,V{sce
BITMAPFILEHEADER bfh; T8t_+|(
G
bfh.bfReserved1=bfh.bfReserved2=0; ,v@C=4'm
bfh.bfType=((WORD)('M'<< 8)|'B'); P9yg
bfh.bfSize=54+size; n=iL6Yu(
bfh.bfOffBits=54; =zsA@UM0
CFile bf; EK 8r V
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k1_"}B5
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); N+nv#]{
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wAA9M4
bf.WriteHuge(lpData,size); wSPwa,)7s
bf.Close(); 7;rf$\-&
nCount++; B;Dl2k^L
} Eb~e=){
GlobalFreePtr(lpData); {lO>i&mx
if(nCount==1) ZNUSHxA
m_Number.Format("%d picture captured.",nCount); Fi8#r)G.
else 1e)5D& njS
m_Number.Format("%d pictures captured.",nCount);
k:i}xKu
UpdateData(FALSE); E``\Jre@
} wf""=;
J#) %{k_
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X%R )
{ U$m[{r2M
if(pMsg -> message == WM_KEYDOWN) {8e4TD9E0
{ )YY8`\F>1
if(pMsg -> wParam == VK_ESCAPE) \R|qXB $
return TRUE; q/eod
if(pMsg -> wParam == VK_RETURN) tO~o-R
return TRUE; g^)8a;/c
} c`s ]ciC
return CDialog::PreTranslateMessage(pMsg); (yO8G-Z0
} 'z$!9ufY,
Aa!#=V1d
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .T*89cEu
{ j21>\K!p
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @g%^H)T
SaveBmp(); u;Rm/.
return FALSE; ZOzwO6(_
} /
0ra]}[(
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I4Rd2G_
CMenu pop; Wagb|B\
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t2_pwd*B
CMenu*pMenu=pop.GetSubMenu(0); B!AJ*
pMenu->SetDefaultItem(ID_EXITICON); 8;<3Tyjzu
CPoint pt; "NvB@>S
GetCursorPos(&pt); G_v^IM#B=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HLb`'TC3r+
if(id==ID_EXITICON) |_u|Td(n
DeleteIcon(); m
?#WQf
else if(id==ID_EXIT) Jq8:33s
OnCancel(); <7*d2
return FALSE; _)a!g-Do7
} cL+bMM$4r~
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C+vk9:"
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xmv^O
AddIcon(); "}^}3"/.
return res; Z_(P^/
}
H$!sK
/L;
c -^
void CCaptureDlg::AddIcon() 'q7&MM'oS^
{ 58[.]f~0
NOTIFYICONDATA data; fD~f_Wr
data.cbSize=sizeof(NOTIFYICONDATA); 8c<OX!
CString tip; a"!r]=r
tip.LoadString(IDS_ICONTIP); +L-(Lz[p
data.hIcon=GetIcon(0); !)HB+yr
data.hWnd=GetSafeHwnd(); W.7XShwd*2
strcpy(data.szTip,tip); il~A(`+YO
data.uCallbackMessage=IDM_SHELL; Jl-:@[;
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,r,$x4*
data.uID=98; ;dquld+q
Shell_NotifyIcon(NIM_ADD,&data); }~!KjFbs
ShowWindow(SW_HIDE); k. ?@qCs[
bTray=TRUE; qt=nN-AC(
} b0aV?A}th
EncJB
void CCaptureDlg::DeleteIcon() [?S-on.
{ Tu7}*vsR
NOTIFYICONDATA data; .q5WK#^
data.cbSize=sizeof(NOTIFYICONDATA); eeCrHt4;
data.hWnd=GetSafeHwnd(); c^8csQ fG
data.uID=98; {O5(O oDa
Shell_NotifyIcon(NIM_DELETE,&data); h"4i/L3aAh
ShowWindow(SW_SHOW); W;QU6z>
SetForegroundWindow(); @WTzFjv@?4
ShowWindow(SW_SHOWNORMAL); @ayrI]m#>,
bTray=FALSE; Z ItS(oJ.
} nEfQLkb[|
i _YJq;(
void CCaptureDlg::OnChange() 2+}hsGnp
{ LLd5Z44v
RegisterHotkey(); zc&i 4K
} u$
a7
';KZ.D
BOOL CCaptureDlg::RegisterHotkey() P$Fq62;}r4
{ DlxL:
UpdateData(); Ybp';8V
UCHAR mask=0; pe>[Ts`2F
UCHAR key=0; XG8UdR|
if(m_bControl) Z>_F:1x
mask|=4; M&5De{LS}
if(m_bAlt) {8w,{p`
mask|=2; nD}CQ_C
if(m_bShift) pg/SYEvsV
mask|=1; cb`ik)=K%
key=Key_Table[m_Key.GetCurSel()]; 9k3RC}dEr
if(bRegistered){ KCi0v
DeleteHotkey(GetSafeHwnd(),cKey,cMask); gmdA1$c
bRegistered=FALSE; P*3PDa@
} f;]C8/ W
cMask=mask; j)Y68fKK
cKey=key; 4rH:`494
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F+285JK
return bRegistered; m?`?T
} bI+ TFOP
68nBc~iAm
四、小结 Q=#@g
*9|*21
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。