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:
wKe^5|Rr
lZV]Z3=p'0 一、实现方法
n_AW0i. D; H</5#Q 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:
X_+`7yCi"x {o+aEMhM #pragma data_seg("shareddata")
6(B0gBCId HHOOK hHook =NULL; //钩子句柄
jpZX5_o UINT nHookCount =0; //挂接的程序数目
VXZd RsV8T static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
= t<!W static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+`u]LOAyP= static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
6g29!F`y static int KeyCount =0;
NS-u,5Jt static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
0aSN8 #pragma data_seg()
2W|4 1%^U=[#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。
s2_j@k?% ,f0cy\.? 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:
l Vo](#W HGfYL')Z BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
LTS3[=AB cKey,UCHAR cMask)
f|WNPFQ$x {
m@.4Wrv BOOL bAdded=FALSE;
muT+H(Z p} for(int index=0;index<MAX_KEY;index++){
[ hm/B`t*e if(hCallWnd[index]==0){
G~a;q+7v'$ hCallWnd[index]=hWnd;
?{\8!_Gvsl HotKey[index]=cKey;
*W y0hnr;] HotKeyMask[index]=cMask;
/$\yAOA'y bAdded=TRUE;
,[,+ _A KeyCount++;
o B_c6]K break;
'`T.K< }
LT!.M m }
ymY,*Rb return bAdded;
H&[ CSc }
Au#(guvm //删除热键
I"#jSazk BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Zla5$GM {
-9} ]J\ BOOL bRemoved=FALSE;
]n${j/x for(int index=0;index<MAX_KEY;index++){
!9356) cV if(hCallWnd[index]==hWnd){
8UwL%"?YB if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#~I%qa"_pa hCallWnd[index]=NULL;
m=z-}T5y!T HotKey[index]=0;
,@R~y HotKeyMask[index]=0;
,COSpq]6 bRemoved=TRUE;
L7G':oA_`p KeyCount--;
vpvPRwJ break;
<4^ _dJ9= }
#?}k0Y }
@bmu4!"d }
v#IW;Rj8 return bRemoved;
hx+a.N }
^>.?kh9z q!7z4Cn vs{i2!^ DLL中的钩子函数如下:
mdypZ 1f_ >sm<
< gVb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
R5X<8(4p {
!a[
voUS BOOL bProcessed=FALSE;
{}D8Y_=9\ if(HC_ACTION==nCode)
I/|)? {
OC#o JwC if((lParam&0xc0000000)==0xc0000000){// 有键松开
LZ|G" 5X[ switch(wParam)
x7L$x=8s {
)U>q>< case VK_MENU:
~uq J@#o{ MaskBits&=~ALTBIT;
bo <.7 break;
@0A0\2 case VK_CONTROL:
5f=e
JDo=x MaskBits&=~CTRLBIT;
_Jj|g9b break;
-F4CHpua case VK_SHIFT:
`;(/Wh MaskBits&=~SHIFTBIT;
Cl\Vk break;
[]1VD# default: //judge the key and send message
r1}OlVbK break;
CmJI" }
G( nT.\ for(int index=0;index<MAX_KEY;index++){
k>K23(X if(hCallWnd[index]==NULL)
JR$Dp&]I continue;
^ ^} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}qmZ {
4L^KR_h/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6^mO<nB bProcessed=TRUE;
}Da8S|)H }
1#(,Bq4 }
.o:Pe2C }
Dd!MG'%hlb else if((lParam&0xc000ffff)==1){ //有键按下
=k2+VI switch(wParam)
@xtcjB9 {
W2%(a0p case VK_MENU:
M7eO5 MaskBits|=ALTBIT;
;T"}dJel# break;
?.v!RdM+ case VK_CONTROL:
zXbTpm MaskBits|=CTRLBIT;
UB .FX break;
@-kzSm case VK_SHIFT:
6b-d#H/1Y MaskBits|=SHIFTBIT;
+_Fsiu_b break;
?j?{}Z default: //judge the key and send message
P;MS%32 break;
6DaH+ }
H3QAIsGS for(int index=0;index<MAX_KEY;index++){
&ad9VB7 if(hCallWnd[index]==NULL)
lLmVat( continue;
[jDO8n/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|ng[s6uf {
RW,ew!Z
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
u<!!%C~+= bProcessed=TRUE;
OJ@';ZyT= }
/B|#GJ\\3 }
A.
U< }
WYRTt2(+% if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
(66X for(int index=0;index<MAX_KEY;index++){
6M"J3\
x if(hCallWnd[index]==NULL)
NvJu)gI% continue;
Iy8gQdI if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
]'~'V2Ey SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#mk#&i3"k //lParam的意义可看MSDN中WM_KEYDOWN部分
Arir=q^2 }
Te$/[`<U }
73Mh65 }
Z:O24{ro5 return CallNextHookEx( hHook, nCode, wParam, lParam );
F8_pwJUpf- }
jtQ2vJ- n_$lRX5 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
t
Z\ H$(%FWzQ% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
w,eYrxR|N BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
@ewQx| ukS@8/eJ 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:
v}xz`]MW<, ppb]RN|) LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1'c!9 {
*N\U{)b\ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
MyCX6+Ci) {
9S=9m[#y' //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^CZn<$ SaveBmp();
E|6X.Ny]
return FALSE;
ORcl=Eo> }
d";+8S …… //其它处理及默认处理
*Z|!%C }
Ywr^uy1V,/ uPR usG4!R 4K0N$9pd: 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
eW\7X%I ecA0z
c~ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
ThJLaNS -M%n<,XN0 二、编程步骤
C<qJnB:B9 'V 1QuSd 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
cQ*:U@ (cNT ud$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
S@N&W&W#~ ln9MVF'!& 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;
{s=QwZdR {r[*}Bv
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;
UbY-)9== 8*>6+"w 5、 添加代码,编译运行程序。
sw{EV0&>m 7"
Dw4}T 三、程序代码
?v8RY,Q30 -Zocu<Rs ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<MT_zET #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Sh2q#7hf #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
| =N8X #if _MSC_VER > 1000
%J~8a _vO #pragma once
Yfxc$ub #endif // _MSC_VER > 1000
k5g\s9n] #ifndef __AFXWIN_H__
?#pL\1"E #error include 'stdafx.h' before including this file for PCH
<|
Xf4. #endif
(;~[}" #include "resource.h" // main symbols
VaVKWJg$ class CHookApp : public CWinApp
@8n0GCv {
mQVduG public:
7 &GhJ^Ku CHookApp();
dL6sb;7R // Overrides
=*"Amd, // ClassWizard generated virtual function overrides
+vDT^|2SF //{{AFX_VIRTUAL(CHookApp)
)ckx&e public:
^row=5]E virtual BOOL InitInstance();
W%0-SR virtual int ExitInstance();
2[j|:Ng7 //}}AFX_VIRTUAL
kJJQcjAP: //{{AFX_MSG(CHookApp)
@_N -> l // NOTE - the ClassWizard will add and remove member functions here.
:T%,.sH // DO NOT EDIT what you see in these blocks of generated code !
V%Y.N4H //}}AFX_MSG
Yk?uxZ4)H DECLARE_MESSAGE_MAP()
]y-r
I };
cX* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
I`Rxijz BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u+8_et5T BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Q`r1pO BOOL InitHotkey();
"i_tO+ BOOL UnInit();
m_\CK5T_ #endif
5>h2WL OjrQ[`(E //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
-?LSw #include "stdafx.h"
=jg!@H=_i #include "hook.h"
>a_K:O|AJ #include <windowsx.h>
}Z0)FU+ #ifdef _DEBUG
<KHB/7 #define new DEBUG_NEW
NmOQ7T #undef THIS_FILE
Q6Jb]>g\H static char THIS_FILE[] = __FILE__;
eUF PzioW #endif
M 80U s. #define MAX_KEY 100
JK,#dA# #define CTRLBIT 0x04
pxDZ}4mOh #define ALTBIT 0x02
~5p
`Kg* #define SHIFTBIT 0x01
Z;WqKIM# #pragma data_seg("shareddata")
kIXLB!L2b^ HHOOK hHook =NULL;
r~t&;yRv UINT nHookCount =0;
3'1O}xO static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
R8":1 #& static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Ij#%Qu static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
hDmVv;M: static int KeyCount =0;
/91H!s static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
B<:i[~`7t #pragma data_seg()
<;v{`@\j{ HINSTANCE hins;
[0)iY%^ void VerifyWindow();
M{O2O( BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
I>9rfmmTI //{{AFX_MSG_MAP(CHookApp)
\ZCc~muR // NOTE - the ClassWizard will add and remove mapping macros here.
3 5|5|ma // DO NOT EDIT what you see in these blocks of generated code!
EWH'x$z_q //}}AFX_MSG_MAP
] +Gi~ END_MESSAGE_MAP()
_|*3uGo: jZm1.{[> CHookApp::CHookApp()
u7a4taM$d {
nwO;>Qr // TODO: add construction code here,
kQX,MP( // Place all significant initialization in InitInstance
+twBFhS7k }
wond>m
3 @X1>Wv|[ CHookApp theApp;
OaU$ [Z'8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
9D8el}uHf {
Q#:,s8TW[ BOOL bProcessed=FALSE;
#c?\(qjWA if(HC_ACTION==nCode)
~^Vt)/}Q {
AQ+w%>G6 if((lParam&0xc0000000)==0xc0000000){// Key up
W dIr3 switch(wParam)
1s!hl{n<~ {
{#Gr=iv~N case VK_MENU:
n"_EDb MaskBits&=~ALTBIT;
S~Nx;sB break;
[@>Kd`!' case VK_CONTROL:
8?I(wn MaskBits&=~CTRLBIT;
;O{AYF?,N break;
B;7L: case VK_SHIFT:
VQqEsnkz MaskBits&=~SHIFTBIT;
m"+9[d_u break;
4fpz;2% default: //judge the key and send message
yt_?4Hc" break;
0>E` 9| }
S'TF7u for(int index=0;index<MAX_KEY;index++){
,h> 0k`J:a if(hCallWnd[index]==NULL)
M[TgNWl/[ continue;
$C^94$W if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
UyK|KL {
"v^Q
! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
dc%+f bProcessed=TRUE;
gX6'!}G8] }
'SOp!h$ }
=xa`)#4( }
jF-z? else if((lParam&0xc000ffff)==1){ //Key down
\7("bB= switch(wParam)
i:{a-Bd {
p^~lQ8t case VK_MENU:
KY4|C05, MaskBits|=ALTBIT;
0XXu_f@]9 break;
pw&l.t6. case VK_CONTROL:
Hyq|%\A MaskBits|=CTRLBIT;
M^+~r,D1u break;
4MIL#1s case VK_SHIFT:
JH<q7Y6!y MaskBits|=SHIFTBIT;
9\Yj`,i5 break;
j.ANBE96> default: //judge the key and send message
a.c2ScXG break;
N}\$i&Vi }
,bJZs-P0 for(int index=0;index<MAX_KEY;index++)
o.Q|%&1 {
QLIm+)T if(hCallWnd[index]==NULL)
7nIg3s% continue;
d!w32Y,. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&o:ZOD. {
4[bw/[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
VbA#D 4; bProcessed=TRUE;
R2u[IVZW:- }
sV3/8W13 }
AO/J:` }
}5DyNfZ]+0 if(!bProcessed){
}54\NSj0 for(int index=0;index<MAX_KEY;index++){
O^sgUT1O if(hCallWnd[index]==NULL)
.hT^7|Jz[ continue;
I uhyBo if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T[ky7\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
y .
AN0 }
S}*#$naK }
^@L }
a)`h*P5@ return CallNextHookEx( hHook, nCode, wParam, lParam );
V3F2Z_VH2 }
PT>,:zY !m]76=@ BOOL InitHotkey()
5+,&9;'Y^ {
k]I<% if(hHook!=NULL){
0=-h9W{zI nHookCount++;
:vV?Yv%P)n return TRUE;
!cWKY\lpv }
Q.vtU%T else
]+fL6"OD/2 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
>Q"eaJxE!l if(hHook!=NULL)
?t?!)# X nHookCount++;
MIi:\m5 return (hHook!=NULL);
k('2K2P }
Udd|. J Rd BOOL UnInit()
9) mJo( {
[&)9|EV if(nHookCount>1){
kO/dZ%vj nHookCount--;
7\5 [lM return TRUE;
97<Y.
0 }
b"{7f BOOL unhooked = UnhookWindowsHookEx(hHook);
U_oMR$/Z if(unhooked==TRUE){
y{"8VT) nHookCount=0;
9>[$;> hHook=NULL;
)UN@|IX }
OG}0{? return unhooked;
//|9J(B] }
) ~ C)4 JnPA; 1@/ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<fN?=u+ {
><^A4s BOOL bAdded=FALSE;
4sROMk=l for(int index=0;index<MAX_KEY;index++){
[Zgy,j\\ if(hCallWnd[index]==0){
=C5[75z#+ hCallWnd[index]=hWnd;
$+V{2k4X, HotKey[index]=cKey;
l3(k HotKeyMask[index]=cMask;
zBqr15 bAdded=TRUE;
(3=. 3[ KeyCount++;
wk)gxn1A, break;
ZLo3
0* }
TC J\@|yw }
Q/0;r{@Tq} return bAdded;
>TK`s@jdSV }
-XD\,y%zi .8fOc.h8h BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zg|yW6l)9 {
Ntg#-_] BOOL bRemoved=FALSE;
#N,\c@Gy for(int index=0;index<MAX_KEY;index++){
A\k-OP] if(hCallWnd[index]==hWnd){
sHh2>f@x$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
oLB pG1Va hCallWnd[index]=NULL;
b%T-nY2 HotKey[index]=0;
9lOUE HotKeyMask[index]=0;
QAcvv 0Hv bRemoved=TRUE;
tHhY1[A8m KeyCount--;
PMkwY{.u break;
`M"b L|[R }
`4l>%S8y: }
E/AM<eN }
<1_?.gSi return bRemoved;
qF( ]Ce }
uCmdNY EYG&~a>L* void VerifyWindow()
0#<_:E {
h
:NHReMT for(int i=0;i<MAX_KEY;i++){
f~W.i] if(hCallWnd
!=NULL){ :GGsQ
n
if(!IsWindow(hCallWnd)){ v-OGY[|97
hCallWnd=NULL; Wpj.G
HotKey=0; "P0o)g+{
HotKeyMask=0; 6^|bKoN/ f
KeyCount--; L{
.r8wSrI
} ;|9VPv/
} 7+=j]+O
} 1\zI#"b ^
} Rra(/j<rQ
%'^m6^g;
BOOL CHookApp::InitInstance() 1~Pht:,t
{ t"RgEH@
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ho^1T3
hins=AfxGetInstanceHandle(); APK@Oq
InitHotkey(); 9x{T"'
return CWinApp::InitInstance(); kl2]#G(
} \gIdg:"02
S2j7(T;~YB
int CHookApp::ExitInstance() :!{aey
{ hhYo9jTHW
VerifyWindow(); | b@?]M
UnInit(); ,0#OA*0B
return CWinApp::ExitInstance(); Xb6@;G"
} ]T
zN*6o
/[{?zS{
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vi lNl|
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S5bk<8aPP
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ eaF5S'k 4$
#if _MSC_VER > 1000 F!a YK2
#pragma once QC
]z--wu
#endif // _MSC_VER > 1000 S :(1=@
U0)(k}Q)
class CCaptureDlg : public CDialog d@#=cvW
{ ed\,FWR
// Construction U76:F?MH
public: -4GSGR'L&y
BOOL bTray; 9';0vrFeM
BOOL bRegistered; O#u)~C?)8
BOOL RegisterHotkey(); |wK)(s
UCHAR cKey; r>osa3N'
UCHAR cMask; {9C(\i +
void DeleteIcon(); D(Xv shQ
void AddIcon(); ?:H9xJ_^
UINT nCount; )[qY|yu
void SaveBmp(); Zsf<)Vx
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ](8XC_-U'
// Dialog Data Y z%=
//{{AFX_DATA(CCaptureDlg) NPf,9c;
enum { IDD = IDD_CAPTURE_DIALOG }; tK8\Ib J
CComboBox m_Key; "gK2!N|#
BOOL m_bControl; Zz/w>kAG*{
BOOL m_bAlt; uP+
j_is
BOOL m_bShift; F}.Af=<Q
CString m_Path; g:f0K2)\r:
CString m_Number; -,XS2[
//}}AFX_DATA uy`U1>
// ClassWizard generated virtual function overrides (<8T*Xo
//{{AFX_VIRTUAL(CCaptureDlg) 3&2,[G04
public: @?e;Jp9
virtual BOOL PreTranslateMessage(MSG* pMsg); hXMC!~Th
protected: ODEy2).
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9N'$Y*. d<
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lXB_HDY
//}}AFX_VIRTUAL MTLcLmdO
// Implementation >6<g5ps.n
protected: a"WnBdFZ
HICON m_hIcon; c/g(=F__[
// Generated message map functions {]Lc]4J
//{{AFX_MSG(CCaptureDlg) ?*4]LuK6
virtual BOOL OnInitDialog(); 4J I;NN
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }i/{8OuW
afx_msg void OnPaint(); f_z2d+
afx_msg HCURSOR OnQueryDragIcon(); Sb,{+Wk
virtual void OnCancel(); d628@~Ekn
afx_msg void OnAbout(); rylllJz|L:
afx_msg void OnBrowse(); Gjv'$O2_
afx_msg void OnChange(); xRaYm
//}}AFX_MSG ShSh/0
DECLARE_MESSAGE_MAP() {/ty{
}; px-*uh<
#endif 5[Q44$a{
FPcgQ
v;p
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file EoOrA@N
#include "stdafx.h" wvUph[j}J
#include "Capture.h" [n< U>up
#include "CaptureDlg.h" jj.yB#T
#include <windowsx.h> BJ&>'rc
#pragma comment(lib,"hook.lib") G`)I _uO
#ifdef _DEBUG nQ/ha9v=n
#define new DEBUG_NEW (:hPT-1
#undef THIS_FILE k@wT,?kD
static char THIS_FILE[] = __FILE__; 3w^q 0/GD
#endif I/Vlw-
#define IDM_SHELL WM_USER+1 ^U`[P@T
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UO!OO&l!
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gzC\6ca
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; DU[UGJg
class CAboutDlg : public CDialog !_c<j4O
{ >\@6i
s
public: Q 2tGe~H
CAboutDlg(); 5E.cJ{
// Dialog Data : ;d&m
//{{AFX_DATA(CAboutDlg)
w[VWk
enum { IDD = IDD_ABOUTBOX }; NIYAcLa@n8
//}}AFX_DATA Ii4Byyfx
// ClassWizard generated virtual function overrides 73]%^kx=
//{{AFX_VIRTUAL(CAboutDlg) FoEZ1O<
protected: kmP0gT{Sj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p?dMa_g
//}}AFX_VIRTUAL l+T\DZ
// Implementation g0ug:- R
protected: LoTq2 /
//{{AFX_MSG(CAboutDlg) a?D\H5TF-
//}}AFX_MSG 7R)"HfUh
DECLARE_MESSAGE_MAP() 57HMWlg
}; al"1T-
SmtH2%y I
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a_pkUOu6
{ O?{pln
//{{AFX_DATA_INIT(CAboutDlg) r3iNfY b
//}}AFX_DATA_INIT (j cLzq
} u}u2{pO!
(]iw#m{
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rT"8e*LT
{ VF6@;5p
CDialog::DoDataExchange(pDX); )6!SFj>.O
//{{AFX_DATA_MAP(CAboutDlg) g3Ff<P P
//}}AFX_DATA_MAP g *^"x&
} /#Ew{RvW'
B4J^ rzK
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) J .El&Dev
//{{AFX_MSG_MAP(CAboutDlg) )"f>cYF
// No message handlers G19FSLrtA
//}}AFX_MSG_MAP YDDwvk
H
END_MESSAGE_MAP() U);
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LkNfcBa_
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xu_Tocvop
: CDialog(CCaptureDlg::IDD, pParent) k*^.-v
{ czedn_}%Q
//{{AFX_DATA_INIT(CCaptureDlg) nY(jN D
m_bControl = FALSE; N*@bJ*0
m_bAlt = FALSE; N%>/
e'(
m_bShift = FALSE; [q_Yf!(m-
m_Path = _T("c:\\"); 'kYV}rq;l
m_Number = _T("0 picture captured."); CZ1tqAk-
nCount=0; g#Yqw
bRegistered=FALSE; vwP516EM
bTray=FALSE; I80.|KIv
//}}AFX_DATA_INIT s$`evX7D
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 N}s[0s
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W+1V&a}E
} J }JT%SW
e6{/e+/R
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \r<&7x#j
{ m>UJ; F
CDialog::DoDataExchange(pDX); =.tsz.:c
//{{AFX_DATA_MAP(CCaptureDlg) \Lh,dZ}d
DDX_Control(pDX, IDC_KEY, m_Key); 1!=$3]l0Lj
DDX_Check(pDX, IDC_CONTROL, m_bControl); U:8^>_
DDX_Check(pDX, IDC_ALT, m_bAlt); &Vl,x/
DDX_Check(pDX, IDC_SHIFT, m_bShift); B?TAS
DDX_Text(pDX, IDC_PATH, m_Path); (<1DPpy95O
DDX_Text(pDX, IDC_NUMBER, m_Number); f'r/Q2{n
//}}AFX_DATA_MAP 5t0i/&zX
} ZwG+ rTW
IO,kP`Wcx
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Fbk<qQH
//{{AFX_MSG_MAP(CCaptureDlg) )vPce
ON_WM_SYSCOMMAND() R2M,VK?Wx
ON_WM_PAINT() PqvwM2}4
ON_WM_QUERYDRAGICON() a9D5qj
ON_BN_CLICKED(ID_ABOUT, OnAbout) $\a;?>WA"
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &I d^n
ON_BN_CLICKED(ID_CHANGE, OnChange) {4:En;
//}}AFX_MSG_MAP HqN|CwGgJ:
END_MESSAGE_MAP() Z$[A.gD4
BRH:5h
BOOL CCaptureDlg::OnInitDialog() {\0 R[+d
{ sW=@G'}3
CDialog::OnInitDialog(); tkJ/h<
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h8S%Q|-
ASSERT(IDM_ABOUTBOX < 0xF000); VgoQz]z
CMenu* pSysMenu = GetSystemMenu(FALSE); 2%WZ-l!i
if (pSysMenu != NULL) xD_jfAH'
{ XFBk:~}sI
CString strAboutMenu; Jl5<9x
strAboutMenu.LoadString(IDS_ABOUTBOX); 6aK%s{%3s
if (!strAboutMenu.IsEmpty()) vtvr{Uqo@
{ MjG.Ili$m
pSysMenu->AppendMenu(MF_SEPARATOR); SSI&WZ2a
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0<>iMr D
} d2(eX\56Z
} {CGk5` g~
SetIcon(m_hIcon, TRUE); // Set big icon Ik kJ4G
SetIcon(m_hIcon, FALSE); // Set small icon 4+ 4?0R
m_Key.SetCurSel(0); zpa'G1v
RegisterHotkey(); ^5GS!u"
CMenu* pMenu=GetSystemMenu(FALSE); t?c*(?Xa
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'TbA^U[
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); MvRuW:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); TyK;
q{
return TRUE; // return TRUE unless you set the focus to a control {0QA+[Yd&!
} qi/%&)GZ
s:fnOMv
"
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4wNxn
lP
{ i.fDH57
if ((nID & 0xFFF0) == IDM_ABOUTBOX) |\}f)Xp-
{ oxad}Y
CAboutDlg dlgAbout; N Z.aI{
dlgAbout.DoModal(); bz>#}P=58G
} X^@d@xU4v
else DPe`C%Oc1
{ :z"Uw*
CDialog::OnSysCommand(nID, lParam); *:d_~B?Tn
} zZE?G:isR
} _wX'u,HrC
rre;HJGEL
void CCaptureDlg::OnPaint() | _S9U|
{
,p 'M@[
if (IsIconic()) O &X-)g=
{ ;eA~z"g
CPaintDC dc(this); // device context for painting ivGxtx
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); IjrTM{f
// Center icon in client rectangle ]_-$
int cxIcon = GetSystemMetrics(SM_CXICON); $MsM$]~
int cyIcon = GetSystemMetrics(SM_CYICON); 5aWKyXBIx
CRect rect; {@3=vBl%O+
GetClientRect(&rect); q$HBPR4h
int x = (rect.Width() - cxIcon + 1) / 2; "\V:W%23W{
int y = (rect.Height() - cyIcon + 1) / 2; )<Yy.Z_:DC
// Draw the icon s ^}V
dc.DrawIcon(x, y, m_hIcon); G-:DMjvN
} yBr{nFOgdY
else S@*@*>s^
{ XBeHyQp
CDialog::OnPaint(); dkVVvK
} xr?r3Y~^e
} %R_8`4IQ
H?B.Hp|
HCURSOR CCaptureDlg::OnQueryDragIcon() &!_Ko`b8K
{ )c!f J7o:
return (HCURSOR) m_hIcon; "iKK&%W
} 'i@Y #F%D
1`)R#$h
void CCaptureDlg::OnCancel() 7"S|GEs:
{ p<J/J.E
if(bTray) f{b"=hQ
DeleteIcon(); |X_yL3`Zb
CDialog::OnCancel(); "w7:{E5e
} "%Rx;xw|
MZ+"Arzb
void CCaptureDlg::OnAbout() }y0UyOa{C
{ f< '~K
CAboutDlg dlg; V8N<%/A=
dlg.DoModal();
t qER;L
} S5uV\Y/A
}SOj3.9{c
void CCaptureDlg::OnBrowse() 9PGSr4V1
{ E@N_~1
CString str; sB"]R%`_
BROWSEINFO bi; 8,H
char name[MAX_PATH]; I)sCWC:Mq~
ZeroMemory(&bi,sizeof(BROWSEINFO)); ZBnf?fU
bi.hwndOwner=GetSafeHwnd(); F4:ssy^
bi.pszDisplayName=name; ",K6zALJ
bi.lpszTitle="Select folder"; *D9QwQ
_|
bi.ulFlags=BIF_RETURNONLYFSDIRS; H-S28%.
LPITEMIDLIST idl=SHBrowseForFolder(&bi); t;?
q#!uc
if(idl==NULL) WRNO) f<
return; !u=[/>
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); LS \4y&J40
str.ReleaseBuffer(); ,0])]
m_Path=str; v0HFW%YJ^J
if(str.GetAt(str.GetLength()-1)!='\\') Ig=4Z*au!g
m_Path+="\\"; R!- RSkB
UpdateData(FALSE); L1 J"_.=P
} b _6j77
19lx;^b
void CCaptureDlg::SaveBmp() u''(;U[
{ q,m6$\g4
CDC dc; @F=4B0=
dc.CreateDC("DISPLAY",NULL,NULL,NULL); k3e
$0`Q
CBitmap bm; ap=_odW~p
int Width=GetSystemMetrics(SM_CXSCREEN); gsZCWT
int Height=GetSystemMetrics(SM_CYSCREEN); 6T)D6;@L
bm.CreateCompatibleBitmap(&dc,Width,Height); 8S)k]$ wf%
CDC tdc; qUVV374N
tdc.CreateCompatibleDC(&dc); g#H#i~E^
CBitmap*pOld=tdc.SelectObject(&bm); 0t<TZa]V
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _w'4f )7
tdc.SelectObject(pOld); Q"\*JV5
BITMAP btm; Dzp9BRS
2f
bm.GetBitmap(&btm); O! ;!amvz
DWORD size=btm.bmWidthBytes*btm.bmHeight; z5Po,@W
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 92S<TAdPP
BITMAPINFOHEADER bih; 7gvkd+-*
bih.biBitCount=btm.bmBitsPixel; 7$/ O{GBJ
bih.biClrImportant=0; i)eub`uMy
bih.biClrUsed=0; k ELV]iWb
bih.biCompression=0; SB]|y-su
bih.biHeight=btm.bmHeight; (LGx;9S?
bih.biPlanes=1; <b{ApsRJf
bih.biSize=sizeof(BITMAPINFOHEADER); ,%D \
bih.biSizeImage=size; BE:GB?XBH
bih.biWidth=btm.bmWidth; a2sN$k
bih.biXPelsPerMeter=0; s% I)+|
bih.biYPelsPerMeter=0; 5{j1<4zxR
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?7(`2=J
static int filecount=0; & [4Gv61
CString name; vrQ/Yf:\B
name.Format("pict%04d.bmp",filecount++); bluhiiATd
name=m_Path+name; \V}?K0#bt
BITMAPFILEHEADER bfh; Bg Uf:PT
bfh.bfReserved1=bfh.bfReserved2=0; / bfLox
bfh.bfType=((WORD)('M'<< 8)|'B'); O?rVa:\
bfh.bfSize=54+size; mD=x3d
bfh.bfOffBits=54; "Q-TLN5(
CFile bf; epR7p^`7
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ':6`M
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #jbo!
wdg
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y!"LrkC
bf.WriteHuge(lpData,size); [|E
93g
bf.Close(); 6f{Kj)
nCount++; eM{,B
} 4f'1g1@$
GlobalFreePtr(lpData); 0%#ZupN
if(nCount==1) R~PD[.\u
m_Number.Format("%d picture captured.",nCount); <"X\~
else DTH;d-Z
m_Number.Format("%d pictures captured.",nCount); +?DP r
UpdateData(FALSE); #px74EeI\
} 1 cvoI
ewvFUD'j
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]>B>.s
{ zU}Ru&T9
if(pMsg -> message == WM_KEYDOWN) .SAOE'Foo
{ K!=Y4"5%
if(pMsg -> wParam == VK_ESCAPE) fX^<H_1$G
return TRUE; w|lA%H7`J
if(pMsg -> wParam == VK_RETURN)
_xjw:
return TRUE; #R-l2OO^]
} `O/1aW1
return CDialog::PreTranslateMessage(pMsg); DI"KH)XD
} iGlg@
+"
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ps[HvV"
{ lkl+o&D9
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <$metN~9j
SaveBmp(); }Vjg>"
return FALSE; ObnQ,x(
} __LR!F]=i
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z_nv|5"
CMenu pop; YS],o'T
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &6deds
CMenu*pMenu=pop.GetSubMenu(0); r}T(?KGx
pMenu->SetDefaultItem(ID_EXITICON); %dn!$[D@
CPoint pt; W2yNwB+{
GetCursorPos(&pt); lrQNl^K}=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Lp31Y .4
if(id==ID_EXITICON) O2N7qV3U,
DeleteIcon(); \D67J239E
else if(id==ID_EXIT) ]WFr5
OnCancel(); Y2$wL9">
return FALSE; &;3iHY;
} uE E;~`G
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D`hl}
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b,h@.s
AddIcon(); qL2!\zt>g
return res; vd{ban9
} 2Sgv
|!m8JV|x
void CCaptureDlg::AddIcon() 7!sR%h5p
{ ;}B6`v
NOTIFYICONDATA data; -sqd?L.p
data.cbSize=sizeof(NOTIFYICONDATA); pGRk
CString tip; v]h^0WU
tip.LoadString(IDS_ICONTIP); V
|cPAT%
data.hIcon=GetIcon(0); 9z#z9|hj)3
data.hWnd=GetSafeHwnd(); _~Id~b
strcpy(data.szTip,tip); RoFoEp
data.uCallbackMessage=IDM_SHELL; um,G^R
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "UYlC0 S\
data.uID=98; QtHK`f>4#n
Shell_NotifyIcon(NIM_ADD,&data); U%rEW[ j
ShowWindow(SW_HIDE); %p;;aZG
bTray=TRUE; :P8X?C63W]
} ;UpdkY
1
\ gO!6
void CCaptureDlg::DeleteIcon() #J'V,_wH
{
MFyi#nq
NOTIFYICONDATA data; :@4+ }
data.cbSize=sizeof(NOTIFYICONDATA); Ak kth*p
data.hWnd=GetSafeHwnd(); }v xRjO,
data.uID=98; .QW@rV:T
Shell_NotifyIcon(NIM_DELETE,&data); U!
$/'Xi9
ShowWindow(SW_SHOW); #EA` |
SetForegroundWindow(); I]ZksC
ShowWindow(SW_SHOWNORMAL); L[voouaqm
bTray=FALSE; 3~%M4(
} oH(a*i
qTz5P
void CCaptureDlg::OnChange() Z&|Dp*Z
{ %RX!Pi}5+g
RegisterHotkey(); ThY\K>@]
} zeshM8=
#Xk/<It
BOOL CCaptureDlg::RegisterHotkey() 0nPg`@e .
{ soOfk!b
UpdateData(); 2WS Wfh
UCHAR mask=0; G0u
H6x?
UCHAR key=0; $}EI3a
if(m_bControl) QL\3|'a
mask|=4; =5O&4G`}
if(m_bAlt) hAJ^(|
mask|=2; XnKf<|j6k
if(m_bShift) 8dh ?JqX
mask|=1; =d$m@rc0r
key=Key_Table[m_Key.GetCurSel()]; ; EsfHCi)
if(bRegistered){ 4D[(X=FSU
DeleteHotkey(GetSafeHwnd(),cKey,cMask); _D{{C
bRegistered=FALSE; b y$S#ef
} Lh-+i
cMask=mask; /~{fPS
cKey=key; PKZMuEEy,
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nTE\EZ+=2
return bRegistered; MSb0J `
} ;ykX]5jGh
x|*m ok
四、小结 #[]B:
n6
-+0!Fkt@,
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。