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:
A
)q=.C#e
S'
<X) 一、实现方法
@A.7`*i_ G~ONHXL 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:
GEs5@EH ?S8_x]E #pragma data_seg("shareddata")
E[=#Rw!* HHOOK hHook =NULL; //钩子句柄
{9c_T!c UINT nHookCount =0; //挂接的程序数目
O)FkpZc@9c static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
evQk,;pIm static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
.wpp)M.w;H static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
0F5QAR
O static int KeyCount =0;
,5XDH6L1 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Dug{)h_2 #pragma data_seg()
)a=FhSB[G 4 (>8tP\Y 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。
hy}n&h ^D]y<@01 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:
V\m51H1mqo dxa[9>V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
/EvnwYQy cKey,UCHAR cMask)
zcE`.)y {
p|`[8uY? BOOL bAdded=FALSE;
)b=m|A GX for(int index=0;index<MAX_KEY;index++){
uQmtd if(hCallWnd[index]==0){
v(GT+i)| hCallWnd[index]=hWnd;
qX"m"ko HotKey[index]=cKey;
ugy:^U HotKeyMask[index]=cMask;
qDK\MQ! bAdded=TRUE;
cx_$`H KeyCount++;
=7vbcAJ\ break;
D,,$ }
!h.bD/?K }
CBu$8]9= return bAdded;
ba"_!D1 }
e_h`x+\: //删除热键
:c3'U_H^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
p5V.O20 {
']^_W0?= BOOL bRemoved=FALSE;
.t9*wz for(int index=0;index<MAX_KEY;index++){
":vF[6K6 if(hCallWnd[index]==hWnd){
3bK=Q3N if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8h{;*Wr- hCallWnd[index]=NULL;
1\LK[tvh HotKey[index]=0;
}nt,DG!r HotKeyMask[index]=0;
!#TM%w bRemoved=TRUE;
k:0nj!^4w> KeyCount--;
J,_IHzO~Z break;
N
6t `45 }
m^%Xl@V:c- }
z#Cgd-^7.# }
OlcWptM$ return bRemoved;
(U_dPf }
=|O><O| "tUc "o>` Y DLL中的钩子函数如下:
y"nL9r.,: ,0^9VWZV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5cZKk/"Ad} {
<=gf|( BOOL bProcessed=FALSE;
|n~Vpy if(HC_ACTION==nCode)
3IYbgUG {
rrc>O*>{i if((lParam&0xc0000000)==0xc0000000){// 有键松开
[W--%=Ou switch(wParam)
]D\p<4uepM {
+]S!pyZ" case VK_MENU:
yoVN|5 MaskBits&=~ALTBIT;
'U{6LSaCb break;
NB.&J7v case VK_CONTROL:
Z*kZUx7I< MaskBits&=~CTRLBIT;
|n %<p break;
an`
GY& case VK_SHIFT:
|7:{vA5 MaskBits&=~SHIFTBIT;
q@%9Y3 break;
D]zpG default: //judge the key and send message
/e50&]2w break;
Jo9!:2? }
=G-u "QJ6 for(int index=0;index<MAX_KEY;index++){
E|BiK if(hCallWnd[index]==NULL)
tRzo}_+N continue;
#e5*Dr8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-) \!@n0 {
|7wiwdD" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^#,cWG}z bProcessed=TRUE;
r57rH^Hc }
-^<`v{}Dn }
2@+MT z }
.,( ,< else if((lParam&0xc000ffff)==1){ //有键按下
J>S`}p switch(wParam)
s[tFaB 1 {
("rIz8b case VK_MENU:
~8^)[n+)x MaskBits|=ALTBIT;
P(XNtQ= K break;
qkh.?~ case VK_CONTROL:
0ZpWfL MaskBits|=CTRLBIT;
M$AQZ')9 break;
ko<VB#pOMr case VK_SHIFT:
pTzfc`~xv MaskBits|=SHIFTBIT;
' $5o5\ break;
'P,F)*kh default: //judge the key and send message
WgC*bp{ break;
Bl8&g]dk }
~zA{=|I2 for(int index=0;index<MAX_KEY;index++){
G##^xFx if(hCallWnd[index]==NULL)
&`A2&mZ continue;
Co^a$K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D[iIj_CKQ {
*S>,5R0k SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fP
5!`8 bProcessed=TRUE;
?.&?4*u }
p!w}hB598 }
k.CHMl] }
oO)KhA?y if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
k%v/&ojI for(int index=0;index<MAX_KEY;index++){
D$[/|%3 if(hCallWnd[index]==NULL)
,wlSNb@' continue;
>`'>,n| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
w=H4#a?fc SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
SsF
5+=A //lParam的意义可看MSDN中WM_KEYDOWN部分
$/uNV1]o }
mca9 +v }
jw!QjVuRN% }
@5-+>\Hd^t return CallNextHookEx( hHook, nCode, wParam, lParam );
/,Sd }
vaEAjg*To< .+cYzS]! 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
sw@*N \ml6B6 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
DLrG-C33 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
6lc/_&0 F ttny] 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
4ng*SE_ P$|DiiH LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%C8fv|@:f {
k^PqB+P! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
jn;b{*Lf {
Y)L\*+
>"[ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
5bzYTK&- SaveBmp();
,As78^E{ return FALSE;
!%2aw0Yv }
UW[{Y|oE …… //其它处理及默认处理
<.<Q.z }
N#`aVW'{v2 2)^[SpZ 7" wn024 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。
WxS=Aip' 'k9hzk(* 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。
S-:7P.#Q 7TQh'j 二、编程步骤
m 5NF)eL ;,h*s,i 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";
s!E-+Gw =9;jVaEMJL 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
sE8.,\ Pk; 9\0k7 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;
K,IPVjS =c8U:\0 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;
r_Rjjo uGQCW\!"4 5、 添加代码,编译运行程序。
ka&-tGg uXNf)?MpA 三、程序代码
/m;w~-N Vy:ER ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
NB&u^8b #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
NW9k.D% #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
e-os0F #if _MSC_VER > 1000
^IGTGY]s #pragma once
H\3CvFm #endif // _MSC_VER > 1000
Y4Z?`TL #ifndef __AFXWIN_H__
t747SZWgB #error include 'stdafx.h' before including this file for PCH
NwG&uc+Q #endif
9CWUhS
#include "resource.h" // main symbols
o+O\VNW class CHookApp : public CWinApp
1*r{%6 {
FK#>E[[ public:
[21tT/ CHookApp();
~::gLm+f // Overrides
9&W\BQ // ClassWizard generated virtual function overrides
=k[!p'~jD //{{AFX_VIRTUAL(CHookApp)
3RRZVc*
^ public:
79%${ajSI virtual BOOL InitInstance();
/d >fp virtual int ExitInstance();
Z3R..vy8 //}}AFX_VIRTUAL
)vS##-[_ //{{AFX_MSG(CHookApp)
pKMf#)qm // NOTE - the ClassWizard will add and remove member functions here.
7@vcQv
kC // DO NOT EDIT what you see in these blocks of generated code !
ryx<^q //}}AFX_MSG
@ec QVk DECLARE_MESSAGE_MAP()
r\[HR ^` };
=dX*:An LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
/:e|B;P`k BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.#h]_% BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3MjMN %{P BOOL InitHotkey();
hpXu3o7e BOOL UnInit();
?k_=?m #endif
_'AIXez7q V_}`2.Pg //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
y::;e#. #include "stdafx.h"
ORx,n7- #include "hook.h"
=QyO$:t #include <windowsx.h>
IFPywL{K #ifdef _DEBUG
~ilbW|s?=k #define new DEBUG_NEW
(p14{ #undef THIS_FILE
`s:| 4;.
static char THIS_FILE[] = __FILE__;
.(S,dG0P #endif
/p>"|z #define MAX_KEY 100
6XQ)Q)
#define CTRLBIT 0x04
66'TdF]" #define ALTBIT 0x02
}C#YR(] #define SHIFTBIT 0x01
6w}:w?=6 #pragma data_seg("shareddata")
MO#%w HHOOK hHook =NULL;
m2|0<P@k! UINT nHookCount =0;
!gf&l ^) static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
JpDYB static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
5Cy)#Z{ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
VY _(0 static int KeyCount =0;
GN1cnM>` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
X\%],"9% #pragma data_seg()
{b<8Z*4W HINSTANCE hins;
{.,OPR"\ void VerifyWindow();
ydns_Z BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
TTE#7\K~B //{{AFX_MSG_MAP(CHookApp)
+]]wf'w // NOTE - the ClassWizard will add and remove mapping macros here.
*=/XlSWF // DO NOT EDIT what you see in these blocks of generated code!
7FDraEr#f //}}AFX_MSG_MAP
T>uLqd{hH END_MESSAGE_MAP()
F'j:\F6C; ;v0sM*x%V CHookApp::CHookApp()
Z=F=@ <! {
"W+4`A(/l // TODO: add construction code here,
\R-u+ci$ZY // Place all significant initialization in InitInstance
c>UITM=!I
}
2CxdNj C}1(@$ CHookApp theApp;
0KDDAkR5R LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#Y18z5vo {
@ ~sp:l BOOL bProcessed=FALSE;
6PMu;# if(HC_ACTION==nCode)
II<<-Y6 {
fRa1m?%s if((lParam&0xc0000000)==0xc0000000){// Key up
p[uwG31IL` switch(wParam)
J)fS2Ni+ {
D9LwYftZ case VK_MENU:
<m(nZ'Zqz2 MaskBits&=~ALTBIT;
r\3In-(AT break;
F}01ikXDb' case VK_CONTROL:
<aHK{*'3 MaskBits&=~CTRLBIT;
2hu6 break;
zWY6D4 case VK_SHIFT:
D!mhR?t MaskBits&=~SHIFTBIT;
4_"ZSVq]# break;
`\Npu default: //judge the key and send message
|M
K-~ep break;
)@Zel.XD }
"7<4NV@yQ for(int index=0;index<MAX_KEY;index++){
X&lkA
( if(hCallWnd[index]==NULL)
,DE%p
+q continue;
-%N (X8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
UJm`GO {
]DUH_<3"E SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[]2GN{m bProcessed=TRUE;
O.$<Bf9
}
nu3 A'E`'k }
'QV4=h` }
~0}eNz* else if((lParam&0xc000ffff)==1){ //Key down
%d7iQZb> switch(wParam)
nK|"; {
WWe.1A, case VK_MENU:
A!f0AEA, MaskBits|=ALTBIT;
'Aqmf+Mm break;
~*[}O)7# case VK_CONTROL:
NPc%}V&C(u MaskBits|=CTRLBIT;
iK#{#ebAoW break;
T5Fah#-4 case VK_SHIFT:
,H%\+yn{ MaskBits|=SHIFTBIT;
cQ8:;-M break;
y1'/@A1 default: //judge the key and send message
vB
Jva8;Q break;
16+@#d%#p }
@KpzxcEoO for(int index=0;index<MAX_KEY;index++)
l1:j/[B= {
T#BOrT>V if(hCallWnd[index]==NULL)
14&EdTG. continue;
foFn`?LF if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X%-4x {
wd]Yjr#%Ii SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
g&bO8vR= bProcessed=TRUE;
p>zE/Pw~ }
*=Fcu@ }
"Dk:r/ }
Ww p^dx`! if(!bProcessed){
TB[vpTC9) for(int index=0;index<MAX_KEY;index++){
E7<:>Uh if(hCallWnd[index]==NULL)
j>T''Tf continue;
!^7:Rr_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[V f|4xcD SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
# SXXYh-e }
B%pvk.` }
xn@jL;+<- }
b?^n'0 return CallNextHookEx( hHook, nCode, wParam, lParam );
w#1dO~ }
/{U{smtdFl ` WB|h)Y BOOL InitHotkey()
l>iU Q&V {
96.Wfx if(hHook!=NULL){
<#Lw.;(U;k nHookCount++;
"+WR[-n>\ return TRUE;
/7#&qx8 }
^
UzF
nW@a else
8tL61x{] hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
xpxm9ySwu if(hHook!=NULL)
4
5lg&oO nHookCount++;
9VByFQgM return (hHook!=NULL);
4_Jdh48-d }
c5;ROnTm BOOL UnInit()
$>UzXhf}\ {
-Gpj^aBU if(nHookCount>1){
Dk-L4FS nHookCount--;
%FU[j^ return TRUE;
?MYD}`Cv }
h$&XQq0T BOOL unhooked = UnhookWindowsHookEx(hHook);
}rE|\p> if(unhooked==TRUE){
GEA;9TU|V nHookCount=0;
o7+/v70D hHook=NULL;
_~kcr5 }
fz&}N`n return unhooked;
;x#>J +QlG }
Ae#6=]V+^ MH?B.2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
FCWphpz {
Cg
Sdyg@ BOOL bAdded=FALSE;
|- fx
0y for(int index=0;index<MAX_KEY;index++){
fh^_=R(/ if(hCallWnd[index]==0){
O2G+
' hCallWnd[index]=hWnd;
5dF=DCZ HotKey[index]=cKey;
+XE21hb
HotKeyMask[index]=cMask;
6!nb)auVi bAdded=TRUE;
<@A^C$g KeyCount++;
"!tB";n break;
Mb>XM7}PU }
+7^Ul6BB#K }
ttnXEF return bAdded;
3(:mRb} }
v,+@
U6i C\^K6,m5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,&=`T7i {
_iu|*h1y BOOL bRemoved=FALSE;
rieQ&Jt" for(int index=0;index<MAX_KEY;index++){
?N
ga if(hCallWnd[index]==hWnd){
|
#Pc
e if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
qM0MSwvC= hCallWnd[index]=NULL;
+joE HotKey[index]=0;
ECScx02 HotKeyMask[index]=0;
!iVFzG
@m bRemoved=TRUE;
)ta5y7np
KeyCount--;
([Aq break;
ry
?2 o! }
@:&+wq_>A^ }
O[y`'z;C }
C=IH#E= return bRemoved;
?C:fP`j: }
kA4ei ~@D%qbN void VerifyWindow()
;ZJ,l)BNO {
PHvjsA%" for(int i=0;i<MAX_KEY;i++){
/09=Tyy/\ if(hCallWnd
!=NULL){ \6 hL W_q1
if(!IsWindow(hCallWnd)){ `5Btg.
&
hCallWnd=NULL; hD1AK+y
HotKey=0; Wts{tb
HotKeyMask=0; `4bd,
KeyCount--; (J&Xo.<Z-
} mM*yv
} lrhAO"/1
} k+[KD >;1
} nY9qYFw
j9}0jC2Tb
BOOL CHookApp::InitInstance() Ye2];(M
{ V(u2{4gZ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y:%)cUxA
hins=AfxGetInstanceHandle(); 2\{uqv
InitHotkey(); Db=>7@h3C
return CWinApp::InitInstance(); S=,1}
XZ
} IWqxT?*
41o!2(e$
int CHookApp::ExitInstance() ,6O9#1A&i
{ fVUBCu
VerifyWindow(); e6HlOGPVQH
UnInit(); 1fW4=pF-K
return CWinApp::ExitInstance(); Rr 4CcM
} /]zib@i
4~A#^5J
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file O'-Zn]@.]
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9+I/y,aC
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Nf 'dT;s.N
#if _MSC_VER > 1000 (Dm"e`
#pragma once Y@H,Lk
#endif // _MSC_VER > 1000 I`W-RWZ
g[au-.:
class CCaptureDlg : public CDialog >J3ja>Gw/
{ =9 M|o0aY
// Construction BhW]Oq&
public: |Xm4(FN\
BOOL bTray; T[h}A"yK;
BOOL bRegistered; -\'.JA_
BOOL RegisterHotkey(); P}9Y8$Y>U
UCHAR cKey; &JhIn%=-
UCHAR cMask; -ouJf}#R
void DeleteIcon(); E#$_uZ4
void AddIcon(); pq?[ wp"
UINT nCount; n,jE#Z.D
void SaveBmp(); ./nYXREO|
CCaptureDlg(CWnd* pParent = NULL); // standard constructor IHbo w0'
// Dialog Data ~hz@9E]O
//{{AFX_DATA(CCaptureDlg) 7e4tUAiuU
enum { IDD = IDD_CAPTURE_DIALOG }; e4qk>Cw
CComboBox m_Key; ~5 pC$SC6>
BOOL m_bControl; #/t>}lc
BOOL m_bAlt; (U'7Fc
BOOL m_bShift; z]l-?>Zbg
CString m_Path; V87ee,
CString m_Number; o\ow{gh9
//}}AFX_DATA y'!p>/%v
// ClassWizard generated virtual function overrides Ot$cmBhw!
//{{AFX_VIRTUAL(CCaptureDlg) B N*,!fx
public: 3cfZ!E~^kc
virtual BOOL PreTranslateMessage(MSG* pMsg); CESe}^)n
protected: Wytvs*\`
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EkStb#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); rfXF 01I
//}}AFX_VIRTUAL "UoCT7X
// Implementation )fd-IYi-3
protected: im\YL<
HICON m_hIcon; a&s"#j
// Generated message map functions QE#-A@c
//{{AFX_MSG(CCaptureDlg) ( X
'FQ
virtual BOOL OnInitDialog(); x-V' 0-#U>
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); lv\F+?]a
afx_msg void OnPaint(); +?j?|G
afx_msg HCURSOR OnQueryDragIcon(); fteyG$-s
virtual void OnCancel(); %<=vbL9
afx_msg void OnAbout(); 9(^X2L&Z
afx_msg void OnBrowse(); _N,KHxsG8B
afx_msg void OnChange(); O5TK&j
//}}AFX_MSG 0(9I\j5`TT
DECLARE_MESSAGE_MAP() ~e`;"n@4
}; {7TJgS
#endif >b4YbLkI#
ZU|V+yT
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >OKS/(I0
#include "stdafx.h" &FJU%tFA
#include "Capture.h" }GNkB
#include "CaptureDlg.h" ZaRr2Z:!
#include <windowsx.h> 7<R6T9g
#pragma comment(lib,"hook.lib") C*{15!d:G
#ifdef _DEBUG ##`;Eh0a
#define new DEBUG_NEW U/3e,`c
#undef THIS_FILE nF. ;LM
static char THIS_FILE[] = __FILE__; }uvKE|umj
#endif U|
41u4)D
#define IDM_SHELL WM_USER+1 0K$WSGB?6j
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UYcyk
$da
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2yJ7]+Jd7Y
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; KtfkE\KP
class CAboutDlg : public CDialog q-3J.VLJ5H
{ G {pP}
public: kol,Qs
CAboutDlg(); gQI(=in
// Dialog Data Gh$y#0qr
//{{AFX_DATA(CAboutDlg) [L*[j.r7[
enum { IDD = IDD_ABOUTBOX }; c<+g|@A#
//}}AFX_DATA zfP[1
// ClassWizard generated virtual function overrides 4uO
@`0:x
//{{AFX_VIRTUAL(CAboutDlg) PtRj9TT
protected: 4[5lX C
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Sr ztTfY
//}}AFX_VIRTUAL g/U$!d_
// Implementation 9{9#AI.G
protected: 5S|}:~7T
//{{AFX_MSG(CAboutDlg) (b`4&sQ<
//}}AFX_MSG ]} 5I>l
DECLARE_MESSAGE_MAP() ++T
"+p
}; q#Yg0w~
>%n8W>^^4
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -~(0O
{ gfdPx:7^
//{{AFX_DATA_INIT(CAboutDlg) 7E!";HT
//}}AFX_DATA_INIT [Q7->Wo|S:
} k lP{yxU'n
xI`Uk8- 8
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |iwM9oO%
{ %S
>xSqX
CDialog::DoDataExchange(pDX); _ bXVg3oDt
//{{AFX_DATA_MAP(CAboutDlg) k\mXo-:V6
//}}AFX_DATA_MAP xP{HjONu
} u
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1kvPiV=X>
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) dt-Qu},8-
//{{AFX_MSG_MAP(CAboutDlg) b[{m>Fa+o#
// No message handlers 4hsPbUx9
//}}AFX_MSG_MAP /@9-!cL
END_MESSAGE_MAP() ;I!+lx3[
Jo7fxWO_g
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DU/9/ I?~
: CDialog(CCaptureDlg::IDD, pParent) 2_oK5*j
{ Zzw}sZ?8
//{{AFX_DATA_INIT(CCaptureDlg) t5ny"k!
m_bControl = FALSE; lQp89*b?=U
m_bAlt = FALSE; AND7jEn
m_bShift = FALSE; R\9>2*w
m_Path = _T("c:\\"); (!3Yc:~RE
m_Number = _T("0 picture captured."); {~j /XB
nCount=0; aWHd}%
bRegistered=FALSE; 2p$n*|T&c
bTray=FALSE; p~Yy"Ec;p
//}}AFX_DATA_INIT v{mv*`~nA\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 EFa{O`_@U
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VL_)]LR*)
} "xe7Dl
4cXAT9
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) b[J-ja.
{ Eonq'Re$
CDialog::DoDataExchange(pDX); %K&+~CJE
//{{AFX_DATA_MAP(CCaptureDlg) G?Qe"4
.
DDX_Control(pDX, IDC_KEY, m_Key); L?3VyBE
DDX_Check(pDX, IDC_CONTROL, m_bControl); l]a^"4L4`o
DDX_Check(pDX, IDC_ALT, m_bAlt); V9 +xL 1U#
DDX_Check(pDX, IDC_SHIFT, m_bShift); =Q/w% 8G
DDX_Text(pDX, IDC_PATH, m_Path); W; 3
R;
DDX_Text(pDX, IDC_NUMBER, m_Number); ALE808;|
//}}AFX_DATA_MAP D:YN_J"kV
} l1-4n*fU
&K9VEMCEX
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ".~MmF
//{{AFX_MSG_MAP(CCaptureDlg) 5z9r S<
ON_WM_SYSCOMMAND() T!m42EvIvE
ON_WM_PAINT() ^Ei*M0fF
ON_WM_QUERYDRAGICON() ~I8v5 H
ON_BN_CLICKED(ID_ABOUT, OnAbout) +?URVp
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) MAuM)8_P/|
ON_BN_CLICKED(ID_CHANGE, OnChange) ;eS;AHZ
//}}AFX_MSG_MAP >%iu!H"
END_MESSAGE_MAP() %-@'CNP
rtB|N-
BOOL CCaptureDlg::OnInitDialog() t Y:G54d=_
{ hrJ$%U
CDialog::OnInitDialog(); +L`V[;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B8bvp:Ho|
ASSERT(IDM_ABOUTBOX < 0xF000); HO266M
CMenu* pSysMenu = GetSystemMenu(FALSE); 89*S?C1
if (pSysMenu != NULL) bh= \
{ J>f
/u:.
CString strAboutMenu; [=XZza.z
strAboutMenu.LoadString(IDS_ABOUTBOX); v;)BVv
if (!strAboutMenu.IsEmpty()) <ldid]o
#
{ c+szU}(f6(
pSysMenu->AppendMenu(MF_SEPARATOR); gzl%5`DB w
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^z[_U}N\}
} ]sX7%3P
} &M0o&C-1/
SetIcon(m_hIcon, TRUE); // Set big icon pd=7^"[};
SetIcon(m_hIcon, FALSE); // Set small icon N; rXl8
m_Key.SetCurSel(0); b*lKT]D,
RegisterHotkey(); C$KaT3I
CMenu* pMenu=GetSystemMenu(FALSE); N+*(Y5TU
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); G[|3^O>P
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !d:tIu{)
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U3mXm?f
return TRUE; // return TRUE unless you set the focus to a control 0^J*+
} )vO_sIbnW
NJ
>I%u*
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tH-gaDj_
{ @Djs[Cs<*
if ((nID & 0xFFF0) == IDM_ABOUTBOX) vg+r?4Q3
{ '9^E8+=|
CAboutDlg dlgAbout; }R`8h&J
dlgAbout.DoModal(); zXj>K3M
} =L:[cIRrT;
else <2n'}&F
{ Wl,%&H2S<
CDialog::OnSysCommand(nID, lParam); I'x$,s
} Q<z)q<e
} *
zd.
,)Yao;Cvd
void CCaptureDlg::OnPaint() 5?^]1P_
{ 0w^jls
if (IsIconic()) I|$'Q$m~
{ V%i<;C
CPaintDC dc(this); // device context for painting Zkw J.SuU
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B#J{ F
// Center icon in client rectangle $`E4m8fX
int cxIcon = GetSystemMetrics(SM_CXICON); V78Mq:7d
int cyIcon = GetSystemMetrics(SM_CYICON); x*:n4FZ7b
CRect rect; ri_P;#lz
GetClientRect(&rect); 8&i;hZm
int x = (rect.Width() - cxIcon + 1) / 2; Xfj)gPt}
int y = (rect.Height() - cyIcon + 1) / 2; kBrvl^D{5
// Draw the icon `2pO5B50
dc.DrawIcon(x, y, m_hIcon); jeY4yM
} FL59
else RwUW;hU
{ wUbmzP.
CDialog::OnPaint(); wh9L(0
} H(MB5
} #X4LLS]VV
a a4$'8s
HCURSOR CCaptureDlg::OnQueryDragIcon() !&Z*yH
{ uRP
Ff77
return (HCURSOR) m_hIcon; 2q12yY f
} N0]z/}hd@
B<A:_'g
void CCaptureDlg::OnCancel() _wMc*kjJO
{ fv:L\N1u
if(bTray) 3)dP7rmZ
DeleteIcon(); sc<kiL
CDialog::OnCancel(); ,&0Z]*
} `$H7KI G
Xu6jHJ@ x
void CCaptureDlg::OnAbout() JFe4/
V
{ <|otZJ'2r
CAboutDlg dlg; !
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dlg.DoModal(); QI.t&sCh5
} bG52s
~Hs=z$
void CCaptureDlg::OnBrowse() cnbo+U
{ 9 _eS`,'
CString str; =+`D
BROWSEINFO bi; E`~i-kf
char name[MAX_PATH]; *<w3" iq
ZeroMemory(&bi,sizeof(BROWSEINFO)); o.v2z~V
bi.hwndOwner=GetSafeHwnd(); /({P1ti:C
bi.pszDisplayName=name; dZF8R
bi.lpszTitle="Select folder"; 'HCnB]1
bi.ulFlags=BIF_RETURNONLYFSDIRS; I I&<
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5qGGu.$Ihi
if(idl==NULL) ehU"*9
return; ;
/=L
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); u]R$]&<
str.ReleaseBuffer(); T{ok +$w2
m_Path=str; av$
if(str.GetAt(str.GetLength()-1)!='\\') nz>K{(
m_Path+="\\"; ) 9xX
UpdateData(FALSE); V):`&@
} [
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V
av)?>J~;
void CCaptureDlg::SaveBmp() Sq<3Rw
{ :r\xkHg/f
CDC dc; Vw7WK
dc.CreateDC("DISPLAY",NULL,NULL,NULL); O
/vWd"
CBitmap bm; %,XI]+d
int Width=GetSystemMetrics(SM_CXSCREEN); ^+EMZFjg(
int Height=GetSystemMetrics(SM_CYSCREEN); g2A"1w<-AH
bm.CreateCompatibleBitmap(&dc,Width,Height); m.!wsw
CDC tdc; jBS'g{y-!
tdc.CreateCompatibleDC(&dc); Ny]lvgu9X
CBitmap*pOld=tdc.SelectObject(&bm); r-*l1([eW
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FbmsN)mv!%
tdc.SelectObject(pOld); u9BjgK(M
BITMAP btm; f0OgK<.>T
bm.GetBitmap(&btm); 'w:bs!
DWORD size=btm.bmWidthBytes*btm.bmHeight; CNq[4T'~A
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); f7ZA837Un
BITMAPINFOHEADER bih; R#D#{cC(
bih.biBitCount=btm.bmBitsPixel; rJX\6{V!_
bih.biClrImportant=0; !F-sA: xq
bih.biClrUsed=0; QOd!]*W`?m
bih.biCompression=0; yk`)Cq%=;
bih.biHeight=btm.bmHeight; 3\]~!;dI
bih.biPlanes=1; Y^yG/F
bih.biSize=sizeof(BITMAPINFOHEADER); |ebvx?\
bih.biSizeImage=size; yYg
bih.biWidth=btm.bmWidth; 5 1"8Py
bih.biXPelsPerMeter=0; E3bwyK!s
bih.biYPelsPerMeter=0; X`D+jiQ(f
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p x0Sy|
static int filecount=0; Nvhy3
CString name; =88t*dH(,"
name.Format("pict%04d.bmp",filecount++); 3Mur*tj#
name=m_Path+name; ERp{gB2U?
BITMAPFILEHEADER bfh; h>| g2h
bfh.bfReserved1=bfh.bfReserved2=0; N70zjy4?fL
bfh.bfType=((WORD)('M'<< 8)|'B'); n? }5!
bfh.bfSize=54+size; jK e.gA
bfh.bfOffBits=54; _%;M9Sg3
CFile bf; 3h LqAj
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?@>;/@
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *CzCUu:%t
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;HP#bx
bf.WriteHuge(lpData,size); 2p+C%"n>
bf.Close(); ^B|YO8.v
nCount++; >r=6A
} 1!d)PK>1$
GlobalFreePtr(lpData); VJ*\pM@no
if(nCount==1) $3]b>v
m_Number.Format("%d picture captured.",nCount); t GC2
^a#~
else Tn /Ut}]O
m_Number.Format("%d pictures captured.",nCount); 22|"K**3J|
UpdateData(FALSE); }DbE4"^K7
} 'd+:D'
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jx'2N~$
{ V'C-'Ythwf
if(pMsg -> message == WM_KEYDOWN) QE3ryD
{ x_k S
g
if(pMsg -> wParam == VK_ESCAPE) <$Z tik1
return TRUE; &lq^dFP&Su
if(pMsg -> wParam == VK_RETURN) +
LS3T^
return TRUE; 8!;$qVt
} |UYED%dC
return CDialog::PreTranslateMessage(pMsg); %2}C'MqS
} l0. FiO@_Q
#3.\j"b
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z(rK^RT
{ P,U$ %C!
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ d-h"JZ9
SaveBmp(); UP]1(S?
return FALSE; CIEJql?`
} X% X$Y6
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Hv8H.^D>
CMenu pop; LJj=]_
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x^X$M$o,l
CMenu*pMenu=pop.GetSubMenu(0); )d:K:YXt
pMenu->SetDefaultItem(ID_EXITICON); g#|oif9o
CPoint pt; obj!I7
GetCursorPos(&pt); dHq#
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ox|TMSb^
if(id==ID_EXITICON) _0.pvQ
DeleteIcon(); >(OYK}ZN
else if(id==ID_EXIT) K?[)E3
OnCancel(); ^&-a/'D$,
return FALSE; (_U^
} -,|ha>r
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [g`, AmR\!
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7=vYO|a/4
AddIcon(); W_%W%i|
return res; ^4 8\>-Q\
} M7vj^mt?
2kVp_=c
void CCaptureDlg::AddIcon() xD4$0Ppu
{ #)`\!)?
NOTIFYICONDATA data; IkU|W3Vo
data.cbSize=sizeof(NOTIFYICONDATA); KJdzv!l=
CString tip; ; :T9IL
tip.LoadString(IDS_ICONTIP); Wy.";/C
data.hIcon=GetIcon(0); Je@k iE
data.hWnd=GetSafeHwnd(); kN.B/itvA
strcpy(data.szTip,tip); {"jd_b&
data.uCallbackMessage=IDM_SHELL; gApz:K[l
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _YLUS$Zw
data.uID=98; 8kS~ENe?o
Shell_NotifyIcon(NIM_ADD,&data); sl^n6N
ShowWindow(SW_HIDE); @mNJ=mEV
bTray=TRUE; 9x[ U$B
} Z7KXWu+6`m
.jargvAL*
void CCaptureDlg::DeleteIcon() {>h97}P
{ B4^`Sw
NOTIFYICONDATA data; c.0]1
data.cbSize=sizeof(NOTIFYICONDATA); F"[3c6yF
data.hWnd=GetSafeHwnd(); ABZ06S/
data.uID=98; hiN/S|JN8y
Shell_NotifyIcon(NIM_DELETE,&data); 5
q65nF
ShowWindow(SW_SHOW); >C# kqxfg
SetForegroundWindow(); g|4w8ry
ShowWindow(SW_SHOWNORMAL); R6<4"?*r
bTray=FALSE; !k-` eJ|
} 5VKcV&D
A0>x9 XSkJ
void CCaptureDlg::OnChange() > H~6NBd5D
{ . ,R4WA,
RegisterHotkey(); m8HYWzN
} A9;0y jae
-dG,*0 >
BOOL CCaptureDlg::RegisterHotkey() $rB6<
{ Y"*:&E2)r
UpdateData(); iadkH]w
UCHAR mask=0; Z2bUs!0
UCHAR key=0; R8 jovr
if(m_bControl) v?)SA];
mask|=4; #w*"qn#2Uz
if(m_bAlt) :,^>d3k
mask|=2; /PW&$P1.]"
if(m_bShift) C_Gzv'C"L
mask|=1; e9:P9Di(b
key=Key_Table[m_Key.GetCurSel()]; !F$R+A+L
if(bRegistered){ ^yJ:+m;6K
DeleteHotkey(GetSafeHwnd(),cKey,cMask); />F.Nsujy
bRegistered=FALSE; Hk9U&j$
} T>F9Hs W
cMask=mask; /AR]dcL@76
cKey=key; dhtb?n{
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); OpQ8\[X+
return bRegistered; KuXkI;63J>
} $H;+}VQ
KoF
iQ?
四、小结 vYdlSe=6G
m|1n
x
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。