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:
?sclOOh
k3UKGP1 一、实现方法
I`q" vt(cC)) 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:
Id=g!L| y\mK?eR #pragma data_seg("shareddata")
ZDr&Alp)o HHOOK hHook =NULL; //钩子句柄
#T08H,W/ UINT nHookCount =0; //挂接的程序数目
.-}F~FES static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
sEx`9_oZ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
aH*5(E] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
HG&rE3@ static int KeyCount =0;
-aQf(= static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
[Mp8" #pragma data_seg()
V%JG :'6L sW0<f&3 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。
]SG(YrF o,_R;'\E[a 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:
&5Huv?^a' CDT3&N1'R BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
qHE( p+]E cKey,UCHAR cMask)
M"E7=J {
A;gU@8m BOOL bAdded=FALSE;
CYZ0F5+t for(int index=0;index<MAX_KEY;index++){
*V?p&/>MT if(hCallWnd[index]==0){
R_B`dP<"~Y hCallWnd[index]=hWnd;
T*rx5*:o HotKey[index]=cKey;
7(B"3qF8| HotKeyMask[index]=cMask;
,7ZV;f81 bAdded=TRUE;
jn+BH3e KeyCount++;
Y(6 p&I break;
~
}?*v} }
x?RYt4 S }
Mc<O ~ return bAdded;
{vU;(eN }
8Lr&-w8J //删除热键
hYSf;cG}A BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>M^4p {
y28 e=i BOOL bRemoved=FALSE;
E[2xo/H for(int index=0;index<MAX_KEY;index++){
~'#,*kA:6 if(hCallWnd[index]==hWnd){
g @qrVQv if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
L%
`lC] hCallWnd[index]=NULL;
@aUQy; HotKey[index]=0;
D\k'Eez HotKeyMask[index]=0;
:bu]gj4e bRemoved=TRUE;
rvp#[RAaS} KeyCount--;
1XJLGMW, break;
XY!0yAK(! }
I6rB_~]h }
R>R8LIZZc }
ZHimS7 return bRemoved;
dQJ)0!B }
`!@d$*:' r0,XR i2X%xYv ^ DLL中的钩子函数如下:
BTDUT%Yfg vY!'@W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
FS7@6I2Ts {
oP_}C[ BOOL bProcessed=FALSE;
1)hO!% if(HC_ACTION==nCode)
?C(3T KH {
Zk>#T:{h if((lParam&0xc0000000)==0xc0000000){// 有键松开
B;c2gu
switch(wParam)
C^*3nd3 {
k%%0"+y#a case VK_MENU:
yhh\?qqy MaskBits&=~ALTBIT;
z~Is
E8 break;
|:,i case VK_CONTROL:
CJe~>4BT MaskBits&=~CTRLBIT;
4^_'LiX3[ break;
9qI#vHA case VK_SHIFT:
P~M<OUg MaskBits&=~SHIFTBIT;
"g:1br?X,9 break;
!U4<4<+ default: //judge the key and send message
jP}Ix8vc= break;
#}S<O_ }
R?iC"s! for(int index=0;index<MAX_KEY;index++){
T.pc3+B8N if(hCallWnd[index]==NULL)
THY=8&x) continue;
)<[)7` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1fqJtP6 {
pYz\GSd SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
N;R I
A bProcessed=TRUE;
T7?cnK" }
0[.T`tpN' }
a~&euT2 }
,$(a,`s) else if((lParam&0xc000ffff)==1){ //有键按下
2 `U+
! switch(wParam)
'g:.&4x_w {
0bl 8J5Ar5 case VK_MENU:
;}}k*<
Z MaskBits|=ALTBIT;
'q\[aKEX= break;
J=6(
4> case VK_CONTROL:
KZGy&u
>` MaskBits|=CTRLBIT;
r mJ`^6V break;
Y(B3M=j case VK_SHIFT:
GUC.t7! MaskBits|=SHIFTBIT;
^T*'B-`C7X break;
{'z( default: //judge the key and send message
|vtj0,[ break;
RX?y}BDo0 }
Cq[<CPAS for(int index=0;index<MAX_KEY;index++){
OBL2W\{ if(hCallWnd[index]==NULL)
1.I58(0~+ continue;
f"R'Q|7D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%<{1N| {
+*Zjo&pc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7f>~P_ bProcessed=TRUE;
ne
8rF.D }
_B7+n"t\r }
IsiBn(1Z }
kK/([! if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Kp>fOe'KW for(int index=0;index<MAX_KEY;index++){
K#LDmC if(hCallWnd[index]==NULL)
=[LUOOR*] continue;
8 `}I] if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
_~bG[lX ! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
mr>dZ) //lParam的意义可看MSDN中WM_KEYDOWN部分
P(aN6)D }
>E9 k5 }
@ RP?)*8}& }
@:t2mz:^i return CallNextHookEx( hHook, nCode, wParam, lParam );
22@w: }
n;e.N:p WSbD."p< 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:
[oOV@GE 9QHV%% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N#GMvU#R BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
DLPg0>;jl )6{,y{5! 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:
B7(bNr o^W.53yX LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
,j(S'Pw {
jIck! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
S,f:nLT {
?*&5`Xh //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Yc^,Cj{OM SaveBmp();
sp6A*mwl return FALSE;
Qv]>L4PO }
_2X6c, …… //其它处理及默认处理
*_@$"9 }
X3m) xE-
_Fv9 ,:8oVq>? 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
B-h@\y oZ>2Tt% 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
Rw^X5ByJE O% 8>siU 二、编程步骤
Lum5Va%0 %xdyGAl: 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
WHcw5_3# g`dAj4B 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
W1ql[DqE{ 10CRgrZ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
H18pVh F#a'N c9 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
w%$J<Z^-? R%6KxN)+@ 5、 添加代码,编译运行程序。
GHpP
*x ]v#T9QQN 三、程序代码
Bo0f`EC I Z@0IvI ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
ZhFlR*EQ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
4e?MthJ> #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Qn}M #if _MSC_VER > 1000
K{0 gkORF #pragma once
f@0Km^a Uc #endif // _MSC_VER > 1000
_8e0vi!~2 #ifndef __AFXWIN_H__
GYtp%<<9; #error include 'stdafx.h' before including this file for PCH
~:99
)AOM #endif
O+t'E9Fa #include "resource.h" // main symbols
h059 DiH class CHookApp : public CWinApp
\lF-]vz* {
Bw>)gSB5$k public:
/L=Y8tDt CHookApp();
as"@E>a // Overrides
IU\h,Ug // ClassWizard generated virtual function overrides
C0W-}H //{{AFX_VIRTUAL(CHookApp)
\S>GtlQbn public:
d$y?py virtual BOOL InitInstance();
9yp'-RKjw virtual int ExitInstance();
4P?@NJp //}}AFX_VIRTUAL
Y+Cv9U0 //{{AFX_MSG(CHookApp)
HqXS-TG // NOTE - the ClassWizard will add and remove member functions here.
'^(qlCI
// DO NOT EDIT what you see in these blocks of generated code !
D{6<,#P{w //}}AFX_MSG
M=4`^.Ocm DECLARE_MESSAGE_MAP()
=g?k`vp };
3*N0oc^m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
3x>Y BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
W8M(@*
T BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Z<#h$XUA BOOL InitHotkey();
Lc0=5]D BOOL UnInit();
ucFfxar" #endif
=lL)g"xX DJ`xCs!R //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
n@J>,K_B #include "stdafx.h"
c9Q _Qr0' #include "hook.h"
.gY=<bG/fA #include <windowsx.h>
2:&L|; #ifdef _DEBUG
V!QC.D< #define new DEBUG_NEW
d'[q2y?6N #undef THIS_FILE
8zQN[[#n static char THIS_FILE[] = __FILE__;
o@ @| 4
F #endif
^M+aQg% #define MAX_KEY 100
E+J +fi #define CTRLBIT 0x04
(?ZS9&y} #define ALTBIT 0x02
|OIU)53A- #define SHIFTBIT 0x01
Se>v|6 #pragma data_seg("shareddata")
av~kF HHOOK hHook =NULL;
cXK.^@du UINT nHookCount =0;
V^_U=Ed@M static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
#lF 2qw static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
WTu!/J<\ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
,;n[_f static int KeyCount =0;
lD$\t/8B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
,,G'Zur7 #pragma data_seg()
D[`~=y( HINSTANCE hins;
-fOBM 4 void VerifyWindow();
czH# ~ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
_z>%h>L|g //{{AFX_MSG_MAP(CHookApp)
)gV @6w // NOTE - the ClassWizard will add and remove mapping macros here.
T1;>qgp4b // DO NOT EDIT what you see in these blocks of generated code!
u56F;y //}}AFX_MSG_MAP
9]:F!d/ END_MESSAGE_MAP()
fvj .M0pb^M CHookApp::CHookApp()
bSa]={}L( {
dw%g9DT // TODO: add construction code here,
@#yl_r% // Place all significant initialization in InitInstance
0@RVM| }
=b>e4I@ x M{SFF CHookApp theApp;
7{38g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
K;]Dh? {
9&{HD BOOL bProcessed=FALSE;
NG:
f>R if(HC_ACTION==nCode)
f/U~X; {
9r
](/"=f if((lParam&0xc0000000)==0xc0000000){// Key up
'r rnTd c switch(wParam)
ysFp$!9Ux {
VP*B<u case VK_MENU:
Qe`Nb4xf MaskBits&=~ALTBIT;
b^"mQ break;
qyjVB/ko case VK_CONTROL:
g|M>C:ZT MaskBits&=~CTRLBIT;
q siV break;
Z9i~>k case VK_SHIFT:
e^v\K[ MaskBits&=~SHIFTBIT;
cCcJOhk|d break;
j9.%(* default: //judge the key and send message
izLB4pk$ break;
[X kWPx` }
S~M/!Xb for(int index=0;index<MAX_KEY;index++){
ps*iE=D if(hCallWnd[index]==NULL)
'N`x@( continue;
BwVq:)P/R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=69sWcC8 {
@XVx{t;g2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
N!<X%Ym bProcessed=TRUE;
6\? 2=dNX }
lU.aDmy< }
|(uo@-U }
E,QD6<?[ else if((lParam&0xc000ffff)==1){ //Key down
IiV]lxiE] switch(wParam)
QT4vjz+| {
WLH ;{ case VK_MENU:
&:~9'-O MaskBits|=ALTBIT;
/*Gbl break;
.g_^! t case VK_CONTROL:
'l3 DP MaskBits|=CTRLBIT;
df/7u}>9 break;
zUWeOR'X case VK_SHIFT:
nLR MaskBits|=SHIFTBIT;
%
@!hf! break;
h<7@3Ur default: //judge the key and send message
zrwzI+4 break;
K{XE|g }
Mtn{63cK for(int index=0;index<MAX_KEY;index++)
uJa.]J~L= {
Fe2t[y:8h if(hCallWnd[index]==NULL)
;8cTy8 continue;
f]2;s#cu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f||S?ns_ {
EmyE%$*T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1w+)ne_& bProcessed=TRUE;
Wr8}=\/ }
KK4rVb:- }
T*k}E }
VRg
y if(!bProcessed){
$<L@B|}F) for(int index=0;index<MAX_KEY;index++){
Yw\lNhoPS if(hCallWnd[index]==NULL)
/1eeNbd continue;
E9]*!^=/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
PR%n>a# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
3!8 u }
$5DlCN }
fFXnD }
9&s>RJ return CallNextHookEx( hHook, nCode, wParam, lParam );
gCbS$Pw }
sIRfC<
/P o'? WWJK6w BOOL InitHotkey()
)ib$*dmUP {
Su<>UsdUC if(hHook!=NULL){
VdGpreRPC nHookCount++;
[4+I1UR` return TRUE;
xEufbFAN? }
b`;Cm)@X!) else
HTSk40V hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
m@YK8c#$ if(hHook!=NULL)
.&n!4F' nHookCount++;
hJ75(I
*j return (hHook!=NULL);
),2|TlQ }
(UZ].+)s BOOL UnInit()
Sx1OY0)s {
Y4[oa?G if(nHookCount>1){
k h6n(B\ nHookCount--;
f[?JLp
return TRUE;
@0%[4 }
(~fv;}}v BOOL unhooked = UnhookWindowsHookEx(hHook);
ep{/m-h(!_ if(unhooked==TRUE){
Xm<|m# nHookCount=0;
+]Ev hHook=NULL;
sAnb
}
}(K1=cEaL return unhooked;
&d]@$4u$; }
wJu9. |Z8Eu0RSb BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(IIZ vCek {
`chD*@76I BOOL bAdded=FALSE;
=&m;5R
for(int index=0;index<MAX_KEY;index++){
2"WP>>b80 if(hCallWnd[index]==0){
ER;\Aes*? hCallWnd[index]=hWnd;
*DvQnj HotKey[index]=cKey;
i/PL!'oq HotKeyMask[index]=cMask;
r(rT.D& bAdded=TRUE;
onm"7JsO' KeyCount++;
Ql"~ z^L break;
*a-KQw
}
\5j#ad }
#$l:% return bAdded;
>` u8( }
0qW"b`9R )[ejb?{d BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8[#EC 3 {
U[z2{\ BOOL bRemoved=FALSE;
f<y3/jl4 for(int index=0;index<MAX_KEY;index++){
Uy@:-NC)kn if(hCallWnd[index]==hWnd){
z`,dEGfh^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j.c{%UYj hCallWnd[index]=NULL;
x+v&3YF HotKey[index]=0;
[kMWsiZ HotKeyMask[index]=0;
bk]g}s bRemoved=TRUE;
fZQ2<*)pqO KeyCount--;
.R^ R|<x break;
iu2O/l#r }
Z:diM$Z?7 }
d+"F(R9 }
cv. j return bRemoved;
OyG2Ks"H }
)|W6Z uH#X:Vne void VerifyWindow()
V{X/y N.u {
=Z..&H5i for(int i=0;i<MAX_KEY;i++){
x@D>JG if(hCallWnd
!=NULL){ "BIhd*K[~
if(!IsWindow(hCallWnd)){ !Z0S@]C
hCallWnd=NULL; )S}.QrG
HotKey=0; Q]OR0-6<.
HotKeyMask=0; WkV0,_(P
KeyCount--; &PX!'%X68h
} . HAFKB;
} g"`jWSt7Q
} 3N4kW[J2i
}
[WXcp1p
<RcB: h
BOOL CHookApp::InitInstance() -h=wLYl@0i
{ '@5x=>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5?|y%YH;R\
hins=AfxGetInstanceHandle(); %vUUx+
InitHotkey(); 8"rK
return CWinApp::InitInstance(); -![{Zb@
} IsjN
xBM
rl-#Ez
int CHookApp::ExitInstance() O2xqNQ`d
{ ]hRs -x
VerifyWindow(); L@J$kqWY
UnInit(); UJjtDV3@_g
return CWinApp::ExitInstance(); JURg=r]LI
}
iF_u/#
YoZd,} i
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C~PP}|<~V
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %&J`mq
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #%{
#if _MSC_VER > 1000 %}unlSTPP
#pragma once }H/94]~tH
#endif // _MSC_VER > 1000 "2 D{X
h;mOfF
class CCaptureDlg : public CDialog '-#gQxIpD
{ *z]P|_:&G
// Construction @6-3D/=
public: S_s;foT
BOOL bTray; ;CuL1N#I
BOOL bRegistered; G]dHYxG
BOOL RegisterHotkey(); F*Ul#yX
UCHAR cKey; q?8#D
UCHAR cMask; lq?N>~PG
void DeleteIcon(); J ayax]u7J
void AddIcon(); :u2tu60&MJ
UINT nCount; [a.(0YLr'w
void SaveBmp(); ;KG}Yr72
CCaptureDlg(CWnd* pParent = NULL); // standard constructor "9Br)3
// Dialog Data YB4|J44Y
//{{AFX_DATA(CCaptureDlg) )iZhE"?z
enum { IDD = IDD_CAPTURE_DIALOG }; zLPCWP.u
CComboBox m_Key; c~d*SDca
BOOL m_bControl; y,c\'}*H
BOOL m_bAlt; ZIc-^&`r=
BOOL m_bShift; ]SN5&S
CString m_Path; K3&k+~$
CString m_Number; 8jiBLZkRf
//}}AFX_DATA k8cR`5@PK
// ClassWizard generated virtual function overrides 5nK|0vv%2
//{{AFX_VIRTUAL(CCaptureDlg) 89W8cJ$yW
public: mn(MgJKQ\
virtual BOOL PreTranslateMessage(MSG* pMsg); ANR611-a
protected: ) P|/<>z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V1A7hRjxvG
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yK mHTjX=
//}}AFX_VIRTUAL 3Q,p,
// Implementation McN'J.Sxp
protected: Rli`]~!w
HICON m_hIcon; #t
VGqf
// Generated message map functions 9gZS)MZ
//{{AFX_MSG(CCaptureDlg) !_?HSDAj"n
virtual BOOL OnInitDialog(); X*e:MRw[
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
)
urUaE
afx_msg void OnPaint(); :]* =f].
afx_msg HCURSOR OnQueryDragIcon(); o+\?E.%%g
virtual void OnCancel(); 9~ifST\
afx_msg void OnAbout(); K%SfTA1TCB
afx_msg void OnBrowse(); p4K
8L'nZ
afx_msg void OnChange(); M[e{(iQ:
//}}AFX_MSG GF0Utp:Zf;
DECLARE_MESSAGE_MAP() rNgAzH
}; ~\zIb/ #
#endif QdIoK7J 9
zeH=py[n
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file fJi?~[5<
#include "stdafx.h" .o8pC
#include "Capture.h" sEx\7t K
#include "CaptureDlg.h" (e3?--~b6
#include <windowsx.h> #QW%
;^
#pragma comment(lib,"hook.lib") v^ 1x}
#ifdef _DEBUG {Hw$`wL
#define new DEBUG_NEW X4"[,:Tw
#undef THIS_FILE *C> N
static char THIS_FILE[] = __FILE__; U"Z%_[*
#endif !
n?j)p.
#define IDM_SHELL WM_USER+1 prxmDI
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zf^@f%R
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6|1#Prj
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; n>%TIoY
class CAboutDlg : public CDialog eT8h:+k
{ , qhv(
public: *y W9-(
CAboutDlg(); +R31YR8C0
// Dialog Data ZaFqGcS~
//{{AFX_DATA(CAboutDlg) eh3CVgH91;
enum { IDD = IDD_ABOUTBOX }; 11JO [
//}}AFX_DATA a0
w
// ClassWizard generated virtual function overrides HGW;] 8xl
//{{AFX_VIRTUAL(CAboutDlg) {dV!sQD
protected: {1GIiP-U
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "~IGE3{
//}}AFX_VIRTUAL nm<S#i*
// Implementation RY*s }f
protected: puGy`9eKv1
//{{AFX_MSG(CAboutDlg) G""=`@
//}}AFX_MSG iEMIzaR
DECLARE_MESSAGE_MAP() 'RCX6TKBnR
}; Uq2 Qh@B
&MP8.(u `
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~I%JVX%
{ }iR!uhi#
//{{AFX_DATA_INIT(CAboutDlg) H3S u'3
//}}AFX_DATA_INIT *Rj*%S
} hhOrO<(
Js!Zk\O
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Pu!%sG jD
{ ;'| t>'0_
CDialog::DoDataExchange(pDX); u8[jD^
//{{AFX_DATA_MAP(CAboutDlg) {>#4{D00
//}}AFX_DATA_MAP jt",\%j
} N)$yBzN
N_E:?Jo
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {7FD-Q[tS
//{{AFX_MSG_MAP(CAboutDlg) ~Q1%DV.
// No message handlers ;p)fW/<
//}}AFX_MSG_MAP [kZe6gYP&
END_MESSAGE_MAP() }-M%$~`
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H3o Um1
: CDialog(CCaptureDlg::IDD, pParent) 7ZgFCK,8m,
{ z^9df(
//{{AFX_DATA_INIT(CCaptureDlg) $qhVow5~
m_bControl = FALSE; p"J\+R
m_bAlt = FALSE; #'kVW{
m_bShift = FALSE; YCB=RT]&`
m_Path = _T("c:\\"); 3 jay V
m_Number = _T("0 picture captured."); 26c1Yl,DMn
nCount=0; C8
2lT_7"
bRegistered=FALSE; [Uu!:SZ
bTray=FALSE;
*:V"C\`^n
//}}AFX_DATA_INIT {\-IAuM
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 cX@72
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); gOA]..lh
} *AN2&>Y
Z9 tjo1X
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KRP)y{~o
{ Hk;) l3oB
CDialog::DoDataExchange(pDX); gUxJ>~
//{{AFX_DATA_MAP(CCaptureDlg) [a1}r=6~
DDX_Control(pDX, IDC_KEY, m_Key); YPsuG -is
DDX_Check(pDX, IDC_CONTROL, m_bControl); 81U(*6
DDX_Check(pDX, IDC_ALT, m_bAlt); q P>Gre
DDX_Check(pDX, IDC_SHIFT, m_bShift); GvT'v0&+
DDX_Text(pDX, IDC_PATH, m_Path); w.H\j9E
l
DDX_Text(pDX, IDC_NUMBER, m_Number); E&RK My)
//}}AFX_DATA_MAP 'B4j=K*
}
fj])
4*9:
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Z"G@I= Q(
//{{AFX_MSG_MAP(CCaptureDlg) KA$l.6&d
ON_WM_SYSCOMMAND() NFcMh+qnK
ON_WM_PAINT()
zWI C4:
ON_WM_QUERYDRAGICON() l]o&D))R
ON_BN_CLICKED(ID_ABOUT, OnAbout) }x1p~N+;
ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
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ON_BN_CLICKED(ID_CHANGE, OnChange) /S+gh;2OC
//}}AFX_MSG_MAP l %{$CmG\
END_MESSAGE_MAP() G@igxnm}
n~k9Z^ $
BOOL CCaptureDlg::OnInitDialog() u!&Vbo? .B
{ pjX')i<
CDialog::OnInitDialog(); ryp@<}A]!d
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YWPAc>uw,
ASSERT(IDM_ABOUTBOX < 0xF000); 3EKqXXzOB
CMenu* pSysMenu = GetSystemMenu(FALSE); (""1[XURQK
if (pSysMenu != NULL) ~?n)1Vr|
{ r$~
f[cA
CString strAboutMenu; O)!MWmr
strAboutMenu.LoadString(IDS_ABOUTBOX); Ym*Ed[S
if (!strAboutMenu.IsEmpty()) u%=M4|7
{ M&iA^Wrs
pSysMenu->AppendMenu(MF_SEPARATOR);
T!N,1"r
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ZO $}m?
} t`X-jr)g
} lvz&7Z b
SetIcon(m_hIcon, TRUE); // Set big icon +kKfx!
SetIcon(m_hIcon, FALSE); // Set small icon <t0o{}^P*
m_Key.SetCurSel(0); ye)CfP=ID\
RegisterHotkey(); ?5!>k^q
CMenu* pMenu=GetSystemMenu(FALSE); %maLo RJ
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;yO7!{_
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +<P%v k
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ')/yBH9mR
return TRUE; // return TRUE unless you set the focus to a control Dh|8$(Jt
} =@>[
z`D;8x2b
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ggUJ -M'2h
{ yA+:\%y$
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0g@
8x_3
{ 8j}CP
CAboutDlg dlgAbout; 4W9#z~'
dlgAbout.DoModal(); 5? `*i"
} #Xc6bA&
else Q1Sf7)
{ X,<n|zp
CDialog::OnSysCommand(nID, lParam); ^ cn)eA
} \P_1@sH=
} eJrJ5mlI`
H}QOoXWkg
void CCaptureDlg::OnPaint() b_]14 v
{ D@(Y.&_
if (IsIconic()) `UpZk?k
{ {g *kr1JM
CPaintDC dc(this); // device context for painting ~',<7eW
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); W|@/<K$V
// Center icon in client rectangle {Ah\-{]
int cxIcon = GetSystemMetrics(SM_CXICON); r~uWr'}a}
int cyIcon = GetSystemMetrics(SM_CYICON); GyOo$FW
CRect rect; +_HPZo
GetClientRect(&rect);
zF2GW
int x = (rect.Width() - cxIcon + 1) / 2; joh=0nk;D
int y = (rect.Height() - cyIcon + 1) / 2; HUtuU X
// Draw the icon q*oUd/F8
dc.DrawIcon(x, y, m_hIcon); 1B;sSp.>
} \*s'S*~
else H|H!VPof]
{ Z4/rqU
CDialog::OnPaint(); 8#w}wGV*
} yD+)!q"
} [e+"G <>
2c.~cNx`q[
HCURSOR CCaptureDlg::OnQueryDragIcon() E3\O?+h#
{ )x-iru
A:
return (HCURSOR) m_hIcon; BOLG#}sm
} MmBM\Dnv
2 fX-J
void CCaptureDlg::OnCancel() +1H.5|
{ ^<R*7mB*
if(bTray) !+4}x;!8
DeleteIcon(); y8Bi5Ae,+1
CDialog::OnCancel(); }MDu QP]
} ->x+ p"
is%qG?,P
void CCaptureDlg::OnAbout() m?G}%u
{ EAcJ>
CAboutDlg dlg; SxYX`NQ
dlg.DoModal(); `J^J_s
} 9KVeFl
=j 6amk-
void CCaptureDlg::OnBrowse() AAkdwo
{ @ba5iIt
CString str; x[3kCa|4A
BROWSEINFO bi; &_
Ewu@4
char name[MAX_PATH]; lM C4j
ZeroMemory(&bi,sizeof(BROWSEINFO)); u2^oXl
bi.hwndOwner=GetSafeHwnd(); ]BU,*YaB
bi.pszDisplayName=name; ik77i?Hg
bi.lpszTitle="Select folder"; AG2iLictv
bi.ulFlags=BIF_RETURNONLYFSDIRS; MPMJkL$F^
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z'PE^ ,
if(idl==NULL) l
tr=_
return; IBY3QG
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !JjB,1
str.ReleaseBuffer(); C:g2E[#
m_Path=str; >De\2gbJ
if(str.GetAt(str.GetLength()-1)!='\\') y@J]busU
m_Path+="\\"; kIV/o
UpdateData(FALSE); 3ryIXC\v
} 2>#Pt^R:C
W{l+_a{/9
void CCaptureDlg::SaveBmp() MN|y5w}$u
{ EVMhc"L
CDC dc; ,b=&iDc
dc.CreateDC("DISPLAY",NULL,NULL,NULL); *A`hKx
CBitmap bm; ho2o/>Ef3
int Width=GetSystemMetrics(SM_CXSCREEN); Z.$ncP0s
int Height=GetSystemMetrics(SM_CYSCREEN); 34
W#
bm.CreateCompatibleBitmap(&dc,Width,Height); 2i#wJ8vrF
CDC tdc; \pB"R$YZ6
tdc.CreateCompatibleDC(&dc); YMwMaU)K,
CBitmap*pOld=tdc.SelectObject(&bm); X&h4A4#P
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); w*r.QzCu,5
tdc.SelectObject(pOld); X~Uvh8O
BITMAP btm; |Sy|E
bm.GetBitmap(&btm); g>x2[//pk
DWORD size=btm.bmWidthBytes*btm.bmHeight; H1f){L97wR
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /] ce?PPC
BITMAPINFOHEADER bih; _CPe
bih.biBitCount=btm.bmBitsPixel; "-kb=fY
bih.biClrImportant=0; ;VM/Cxgep
bih.biClrUsed=0; UXoaUW L
bih.biCompression=0; {%@zQ|OO0
bih.biHeight=btm.bmHeight; }-k<>~FA
bih.biPlanes=1; @0?Mwy!
bih.biSize=sizeof(BITMAPINFOHEADER); |cJyP9}n
bih.biSizeImage=size; [[QrGJr
bih.biWidth=btm.bmWidth; _wKFT>
bih.biXPelsPerMeter=0; pzezN
bih.biYPelsPerMeter=0; g1L$+xD^
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
+O}6 8N
static int filecount=0; w`,[w,t
CString name; zWgNDYT~
name.Format("pict%04d.bmp",filecount++); fQlR;4QX]
name=m_Path+name; _L(6F
TJ
BITMAPFILEHEADER bfh; -*k%'Gr
bfh.bfReserved1=bfh.bfReserved2=0; |&3m '"(
bfh.bfType=((WORD)('M'<< 8)|'B'); qih7
bfh.bfSize=54+size; s<|.vVi"
bfh.bfOffBits=54; O82T| 0uw
CFile bf; oDTt+b
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?UoA'~=
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |]HU$GtS
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |:`f#H
bf.WriteHuge(lpData,size); BKIAc6
bf.Close(); x
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nCount++; eP|:b &
} ]|( (&Y
rl
GlobalFreePtr(lpData); ouK&H|'
if(nCount==1) bT*MJ7VVm
m_Number.Format("%d picture captured.",nCount); ]<A|GY0q1
else Xdsd5 UUM
m_Number.Format("%d pictures captured.",nCount); |dpOE<f[
UpdateData(FALSE); VjSb>k
} K0yTHX?(.
rv1kIc5Za<
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2J^6(vk
{ Axhe9!Fm
if(pMsg -> message == WM_KEYDOWN) }XWic88!~
{ X3#|9
if(pMsg -> wParam == VK_ESCAPE) .B{3=z^
return TRUE; hAHl+q)w?
if(pMsg -> wParam == VK_RETURN) bKYLBu:
return TRUE; [Oe$E5qv)]
} FEw51a+V
return CDialog::PreTranslateMessage(pMsg); 5Jd&3pO
}
FAJ\9
4\x'$G
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :Sk0?WU
{ rJ]iJ0[I
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R8F[
7&(
SaveBmp(); vUR{!`14
return FALSE; 5Az=)q4Q
} <33[qt~
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k/=J<?h0
CMenu pop; .%<oy"_
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); X{P_HCd
CMenu*pMenu=pop.GetSubMenu(0); #+|{l*>
pMenu->SetDefaultItem(ID_EXITICON); !>Db
CPoint pt; SfyZ,0
GetCursorPos(&pt); )TFaG[tj
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VZ'[\3J
if(id==ID_EXITICON) [MdVgJ9'
DeleteIcon(); HvN!_}[
else if(id==ID_EXIT) _-x|g~pV*
OnCancel(); }RYr)
return FALSE; Zk"'x,]#
} !
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LRESULT res= CDialog::WindowProc(message, wParam, lParam); J "yO\Y
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >B U0B
AddIcon(); Mi,yg=V
return res; D5Wo e&g,
} $FZ~]Ef
&Vg+n0
void CCaptureDlg::AddIcon() iUFS1SN \
{ LoSblV
NOTIFYICONDATA data; 7f#e#_sM;
data.cbSize=sizeof(NOTIFYICONDATA); RmY5/IYR|:
CString tip; b%L8mX
tip.LoadString(IDS_ICONTIP); TDs=VTd@Z
data.hIcon=GetIcon(0); _(5SiK R
data.hWnd=GetSafeHwnd(); 21bvSK
strcpy(data.szTip,tip); f)l:^/WP+
data.uCallbackMessage=IDM_SHELL; w&hgJ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Q4Zuz)r*
data.uID=98; @AaM]?=P{
Shell_NotifyIcon(NIM_ADD,&data); bdZ[`uMD
ShowWindow(SW_HIDE); >A|(mc
bTray=TRUE; YD
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} *9y)B|P^
#wK { G)J
void CCaptureDlg::DeleteIcon() iagl^(s
{ KPSFy<
NOTIFYICONDATA data; q.U` mtS
data.cbSize=sizeof(NOTIFYICONDATA); s]50Y-C
data.hWnd=GetSafeHwnd(); -;20|US)u
data.uID=98; ? [l[y$9
Shell_NotifyIcon(NIM_DELETE,&data); 6X~.J4
ShowWindow(SW_SHOW); z85%2Apd
SetForegroundWindow(); x2=Bu#Y
ShowWindow(SW_SHOWNORMAL); x^Q:U1
bTray=FALSE; P}29wr IZ
} bGOOC?[UX
/W1!mih
void CCaptureDlg::OnChange() t6m3lq{
{ Bha#=>4FU
RegisterHotkey(); '#!nK O2<
} B>rz<bPT
r@ujE,D=k
BOOL CCaptureDlg::RegisterHotkey() X0Zqx1
{ 3_|<CE6
UpdateData(); W@`2+}
UCHAR mask=0; {^=T&aCYdS
UCHAR key=0; "s]r"(MX
if(m_bControl) T\I}s"d
mask|=4; 3)88B"E
if(m_bAlt) ~U(`XvR\4
mask|=2; OB`(,m#
if(m_bShift) b3F)$UQ
mask|=1; -0r0M)
key=Key_Table[m_Key.GetCurSel()]; v/*}M&vo
if(bRegistered){ h/ 5|3
DeleteHotkey(GetSafeHwnd(),cKey,cMask);
I{tY;b'w
bRegistered=FALSE; `-fWNHs
} {L~j;p_G&
cMask=mask; S"'0lS
cKey=key; w=:o//~6j
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); O 7RIcU
return bRegistered; ,%"!8T
} h?R{5?RxK
J!Er%QUR
四、小结 :dq.@:+<R
*o.f<OwOz
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。