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:
fJ0V|o
X
y`2ux+>/ 一、实现方法
p Q!lY Q2)(tB= ) 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:
[La}h2gz D?8(n=#[ #pragma data_seg("shareddata")
_ker,;{9C HHOOK hHook =NULL; //钩子句柄
7&/1K%x9; UINT nHookCount =0; //挂接的程序数目
Q`NdsS2 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
:WsHP\r static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/Oi(5?Jn static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Z{:;LC static int KeyCount =0;
GU9G5S. static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
'n1$Y%t #pragma data_seg()
^*+M9e9Z z@o6[g/*Q 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
(C1~>7L VbMud]40F DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
P-$ , ,grx'to(X BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
^^*L;b>I cKey,UCHAR cMask)
|(2#KMEWa {
b:r8r}49 BOOL bAdded=FALSE;
e@;'# t for(int index=0;index<MAX_KEY;index++){
3$Vx8:Rhdn if(hCallWnd[index]==0){
-ah)/5j hCallWnd[index]=hWnd;
Qx3eEt@X5] HotKey[index]=cKey;
!`4ie HotKeyMask[index]=cMask;
/OB) \{- bAdded=TRUE;
)db:jPkwd KeyCount++;
a(*"r:/lD break;
)f8 ;ze }
?.uhp }
k@s<*C return bAdded;
ixK9/5T }
08{^Ksg //删除热键
-;ra(L` BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[s\8@5?E
{
c0HPS9N\ BOOL bRemoved=FALSE;
^$C&{% for(int index=0;index<MAX_KEY;index++){
:VWN/m if(hCallWnd[index]==hWnd){
MK @rx6<9 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
jJNl{nyq hCallWnd[index]=NULL;
3TLym& HotKey[index]=0;
(d@(QJ HotKeyMask[index]=0;
!Q<3TfC bRemoved=TRUE;
Wd+G)Mu_= KeyCount--;
)m+O.`x break;
>R_m@$` }
\ykA7Y% }
6d6Dk>(V }
Q4*{+$A return bRemoved;
&/2+'wCp5 }
Gc*=n*@^K DfU= i'R nk_X_y DLL中的钩子函数如下:
GA`
bWl 64'QTF{D LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
=qoOr~ {
;($xAAR BOOL bProcessed=FALSE;
9z{g3m70@ if(HC_ACTION==nCode)
D|<_96_m {
ZR%$f- if((lParam&0xc0000000)==0xc0000000){// 有键松开
;&f(7 Q+T_ switch(wParam)
-5]lHw} {
g.blDOmlc case VK_MENU:
"PWGtM:L8Y MaskBits&=~ALTBIT;
__s'/6u break;
|,S]EHIy case VK_CONTROL:
RRYcg{g MaskBits&=~CTRLBIT;
ut]UU*g^$ break;
N!ay#V case VK_SHIFT:
pDJN}XtjT MaskBits&=~SHIFTBIT;
r#_0_I1[ break;
?~T(Cue> default: //judge the key and send message
/*BK6hc break;
m8x?`Gw~jw }
%K8YZc(& for(int index=0;index<MAX_KEY;index++){
a5O$he if(hCallWnd[index]==NULL)
0H.bRk/P+ continue;
kka{u[ruA if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7fzH(H {
M
#0v# {o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K^[m-- bProcessed=TRUE;
~;pP@DA }
ahZ@4v }
lKU{jWA }
6vxRam6[?? else if((lParam&0xc000ffff)==1){ //有键按下
WlY\R>x# switch(wParam)
tJQZRZViu {
jk_yrbLc case VK_MENU:
[`E_/95 MaskBits|=ALTBIT;
[McH l1a break;
?/5<}W#7} case VK_CONTROL:
xluAjOQ6 MaskBits|=CTRLBIT;
GUM-|[~ break;
J#4pA{01w case VK_SHIFT:
sa/9r9hc+ MaskBits|=SHIFTBIT;
1M?x,N_W break;
[ +CFQf> default: //judge the key and send message
]\>MDH break;
L0H^S)g }
:SO4@JT{W for(int index=0;index<MAX_KEY;index++){
>ifys)wg> if(hCallWnd[index]==NULL)
zVe,HKF/ continue;
"}%j' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$sb@*K}:4 {
H8B.c%_|U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
p[%~d$JUq bProcessed=TRUE;
dD'KP4Io@ }
n ~ &ssFC }
wv\"(e7( }
r4gLoHD) if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
'Z,7{U1P for(int index=0;index<MAX_KEY;index++){
*%_M?^ if(hCallWnd[index]==NULL)
Xkx&'/QG,U continue;
pNuU{:9 B0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
nehk8+eV_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
2$b1q!g< //lParam的意义可看MSDN中WM_KEYDOWN部分
vO"E4s }
J|o<;9dg1 }
KyDd( 'i }
){u#
(sW return CallNextHookEx( hHook, nCode, wParam, lParam );
j5[>HL }
-Gl!W`$I` LV0gw" 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:
?}W#j -;HZ!Lf BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
C R't BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
+]yVSns
3 'Cz]p~oF 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:
,,IK} 'cIFbjJ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
_U*1D*kLI[ {
6 !fq658 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
$Op:-aW& {
8Jp?@qt=$ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
$(OL#>9Ly SaveBmp();
G%i&C)jZ return FALSE;
!^1oH** }
@^-f+o …… //其它处理及默认处理
}095U(@ }
ov\%*z2= 673G6Nk i1b3>H*3 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
,y/m5-D! &@2`_%QtA 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
@Y(7n/*
_$HC NFdh 二、编程步骤
xs"\c7pC y|9 LtQ 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";
G&M)n*o >%_i#|dE> 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]i
`~J ,s@S`KS0 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;
chE}`I? Tn38]UL 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;
%F;uW[4r SokU9n! 5、 添加代码,编译运行程序。
3rX8H`R `@:k*d 三、程序代码
`sRys oW Q2@yUDd! ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
q^@*k,HG #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
{w99~? #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
,?
&$c+ #if _MSC_VER > 1000
1ahb:Mjv #pragma once
(t,|FkVLV #endif // _MSC_VER > 1000
MpIP)bdq7 #ifndef __AFXWIN_H__
PbMvM #error include 'stdafx.h' before including this file for PCH
W%9"E??c #endif
tf9a- s #include "resource.h" // main symbols
9w\C
vO&R class CHookApp : public CWinApp
5y~B/.YY {
1py>[II@ public:
%.{xo.`a[ CHookApp();
z KG]7 // Overrides
gvP.\,U // ClassWizard generated virtual function overrides
PC!X<C8* //{{AFX_VIRTUAL(CHookApp)
U/rFH9e$ public:
o 7 &q virtual BOOL InitInstance();
f_QZql virtual int ExitInstance();
f{]W*!VV- //}}AFX_VIRTUAL
GMob&0l8_ //{{AFX_MSG(CHookApp)
)f%Q7 // NOTE - the ClassWizard will add and remove member functions here.
S8]YS@@D // DO NOT EDIT what you see in these blocks of generated code !
Y3'dV) //}}AFX_MSG
oYeFOw` DECLARE_MESSAGE_MAP()
lJ4/bL2I/ };
lstnxi%x LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>LEp EMJ\ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
S?~/
V ] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7{f{SIB BOOL InitHotkey();
(*!4O>] BOOL UnInit();
L7.LFWq$S #endif
]jP0Z# v #Q(g/^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
B :1r;8{j #include "stdafx.h"
\&Oc}] #include "hook.h"
42DB0+_wz #include <windowsx.h>
ob(~4H- #ifdef _DEBUG
k@2@%02o9C #define new DEBUG_NEW
]5eZLXM #undef THIS_FILE
yfe4}0} static char THIS_FILE[] = __FILE__;
0:>C v<N #endif
Yp9%u9tNq #define MAX_KEY 100
_qS4Ns/4s #define CTRLBIT 0x04
.OF2O} #define ALTBIT 0x02
`%0k\,}V #define SHIFTBIT 0x01
8uetv #pragma data_seg("shareddata")
,aSK L1 HHOOK hHook =NULL;
sRGIHT# UINT nHookCount =0;
Y2y =
P static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
TJ(vq] |& static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
LBhDP5qF static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
HwZ@T &_4 static int KeyCount =0;
N*>&XJ# static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
IeE6?!,) #pragma data_seg()
5'3H$%dC HINSTANCE hins;
D4QLlP void VerifyWindow();
ZL- ` 3x BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
uy=E92n3 //{{AFX_MSG_MAP(CHookApp)
1Q??R} // NOTE - the ClassWizard will add and remove mapping macros here.
+0n,>eDjg^ // DO NOT EDIT what you see in these blocks of generated code!
d7L|yeb" //}}AFX_MSG_MAP
C;rK16cn END_MESSAGE_MAP()
xo(3<1mD p/&s-GF CHookApp::CHookApp()
d0 yZ9-t {
%@[ ~s,6< // TODO: add construction code here,
CLY>M`%?+p // Place all significant initialization in InitInstance
]=0$-ImQ@x }
NE!] uB3Yl=P CHookApp theApp;
@>hXh
+!2h LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>U[YSsFt6 {
je~gk6}Y BOOL bProcessed=FALSE;
JztSP? if(HC_ACTION==nCode)
T#R*] {
4B=@<(H if((lParam&0xc0000000)==0xc0000000){// Key up
VWE`wan< switch(wParam)
C Z/:(sOJ {
fhQ}Z%$ case VK_MENU:
?N!.:~~k MaskBits&=~ALTBIT;
H-Or break;
EN2/3~syO- case VK_CONTROL:
UNKXfe(X9 MaskBits&=~CTRLBIT;
CK RnkTTiV break;
F%e5j9X` case VK_SHIFT:
uze5u\ MaskBits&=~SHIFTBIT;
tp=/f
!bv break;
WEB enGQ default: //judge the key and send message
u69s}yZ break;
*Mr'/qp, }
TY*q[AWG for(int index=0;index<MAX_KEY;index++){
&+F}$8, if(hCallWnd[index]==NULL)
\"hP*DJ" continue;
r#'E;Yx if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Fpf-Fa-K\b {
.ID9Xd$fky SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
:jioF{, bProcessed=TRUE;
AoN|&o }
?$rHyI }
7e`h,e= }
;CdxKr-d else if((lParam&0xc000ffff)==1){ //Key down
M/a5o|>8 switch(wParam)
3D"?|rd~ {
Fo[=Dh*AqU case VK_MENU:
k8ej. MaskBits|=ALTBIT;
p3z%Y$!Tm break;
N"o+;yR case VK_CONTROL:
@)p?!3{" MaskBits|=CTRLBIT;
O_/|Wx break;
~l>2NY case VK_SHIFT:
,*'aH z MaskBits|=SHIFTBIT;
#`{L_n$c break;
9q
f=P3 default: //judge the key and send message
-
-H%FYF` break;
:~+m9r }
w?zY9Fs=s for(int index=0;index<MAX_KEY;index++)
tR% &.,2 {
i$W=5B>SO if(hCallWnd[index]==NULL)
14;lB.$p continue;
|9cSG),z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:\8&Th}Se {
i5^U1K\M SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
W8{zV_TBm bProcessed=TRUE;
0ud>oh4WPR }
H@hHEzO }
Qp]-4%^Vz }
S k&l8" if(!bProcessed){
b!xm=U for(int index=0;index<MAX_KEY;index++){
^5d9n<_xnQ if(hCallWnd[index]==NULL)
1*J#:|({(
continue;
`di/nv) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
BY^5z<^. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
O/2Jz }
i7(\i2_P }
vAp?Zl?g }
-$m?ShDd return CallNextHookEx( hHook, nCode, wParam, lParam );
^L;k }
Q.Ljz
Z i@XFnt BOOL InitHotkey()
CHRO9 {
oc3}L^aD if(hHook!=NULL){
(N25.}8Y nHookCount++;
'=eE6=m^K return TRUE;
bkfk9P }
Rk.GrLp else
vswBK-w(Z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
[v$NxmRu if(hHook!=NULL)
D&r2k
9 nHookCount++;
J=qPc}+ return (hHook!=NULL);
bP ,_H }
%!e;sL~& BOOL UnInit()
PC}m.tE {
;BMm47< if(nHookCount>1){
rCa2$#Z nHookCount--;
z7P]g
C$\ return TRUE;
=q-HR+ }
Rr>h8Ni < BOOL unhooked = UnhookWindowsHookEx(hHook);
hPHrq{YZ if(unhooked==TRUE){
Du2v,n5@ nHookCount=0;
!HP/`R hHook=NULL;
vAMr&[ }
jL[
hB return unhooked;
J6Q}a7I# }
DfQD!}= az2CFd^M BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8fwM)DKS {
f:-dw6a=s BOOL bAdded=FALSE;
Ew kZzVuX for(int index=0;index<MAX_KEY;index++){
t846:Z%[ if(hCallWnd[index]==0){
a:3f>0_t hCallWnd[index]=hWnd;
;c_pa0L HotKey[index]=cKey;
w+0Ch1$ HotKeyMask[index]=cMask;
/o_h'l|PS bAdded=TRUE;
5{&<X.jv KeyCount++;
TGJ\f break;
zUhJr$N$ }
?~5J!|r# }
Xqac$%[3 return bAdded;
S(f V ,;Z }
8?7gyp!k_f :>t?^r( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]'/ZSy, {
~t~5ctJ@ BOOL bRemoved=FALSE;
mrfc.{`[
for(int index=0;index<MAX_KEY;index++){
>%D=#}8l@ if(hCallWnd[index]==hWnd){
_Vq7Gxy$R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
!cWnQRIt_F hCallWnd[index]=NULL;
j>0~"A HotKey[index]=0;
9#;UQ.qA HotKeyMask[index]=0;
igW>C2J bRemoved=TRUE;
rpNe8"sh KeyCount--;
*G{Zo*2<
i break;
G
Riu] }
Q4;br?2H }
RO"*&o'K' }
y=jTS return bRemoved;
a;A&>Ei} }
oEWx9c{~$ 2F[;Z*& void VerifyWindow()
V!SB9t`E {
(1vmtg.O for(int i=0;i<MAX_KEY;i++){
CKTD27}) if(hCallWnd
!=NULL){ X; gN[
if(!IsWindow(hCallWnd)){ a'v%bL;H~
hCallWnd=NULL; [i '\d}
HotKey=0; DvuL1MeKo
HotKeyMask=0; zq5_&AeW
KeyCount--; )^&)f!f
} LQMVC^G
} W`PK9juu
} W&>+~A
} ]rh)AE!Y(
"iof -b=ys
BOOL CHookApp::InitInstance() 8bX\^&N
{ i`g>Y5
AFX_MANAGE_STATE(AfxGetStaticModuleState()); N[$(y}
!s
hins=AfxGetInstanceHandle(); T_}\
InitHotkey(); vR?L/G^.
return CWinApp::InitInstance(); Z6b3gV
} X
|f'e@
.~5cNu'#m
int CHookApp::ExitInstance() y(RbW_
?
{ /N@0qQ
VerifyWindow(); pg~`NN
UnInit(); } V4"-;P
return CWinApp::ExitInstance(); *ihg'
} w?AE8n$8
Oz9k.[j(
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ubhem(p#
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RU`TzD
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_
FFgy=F
#if _MSC_VER > 1000 Jz#ZDZkm
#pragma once iR#jBqXD
#endif // _MSC_VER > 1000 ,gU9ywg
&%Hj.
class CCaptureDlg : public CDialog )`rC"N)
{
=*'X
// Construction ftq~AF
public: kmW!0hm;e
BOOL bTray; lb1(1|#
BOOL bRegistered; \Mlj
7.u]
BOOL RegisterHotkey(); q_f
v1U3
UCHAR cKey; tazBZ'\c
UCHAR cMask; _>5BFQ_
void DeleteIcon(); gWS49*O
void AddIcon(); #%e`OA(b
UINT nCount; a~ REFy
void SaveBmp(); $^7&bQ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4PUM.%
// Dialog Data AmSJ!mTd8o
//{{AFX_DATA(CCaptureDlg) 'q*1HNwGp
enum { IDD = IDD_CAPTURE_DIALOG }; 7k3":2:
CComboBox m_Key; B0Z~L){i
BOOL m_bControl; V!KtF
BOOL m_bAlt; y&__2t^u
BOOL m_bShift; "_)
CString m_Path; ==(M
vu`
CString m_Number; v%aD:%wlY@
//}}AFX_DATA 5<w0*~Zd~
// ClassWizard generated virtual function overrides ]Wa,a
T'
//{{AFX_VIRTUAL(CCaptureDlg) n.lp
ena
public: d(a6vEL4
virtual BOOL PreTranslateMessage(MSG* pMsg); Iz{AA-
protected: ((dG<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y,mH ]
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sCb?TyN'n
//}}AFX_VIRTUAL "<O?KO3K
// Implementation `bC_J,>_
protected: u gfV'
HICON m_hIcon; 5o~Z>
// Generated message map functions EoY#D'[
//{{AFX_MSG(CCaptureDlg) w#b~R^U
virtual BOOL OnInitDialog(); P6=|C;[
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >Ft jrEB
afx_msg void OnPaint(); `ZefSmb
afx_msg HCURSOR OnQueryDragIcon(); FpRK^MEkG
virtual void OnCancel(); #3CA
afx_msg void OnAbout(); h V8A<VT
afx_msg void OnBrowse(); Pq4sv`q)S
afx_msg void OnChange(); SyYa_=En
//}}AFX_MSG 8'cD K[L
DECLARE_MESSAGE_MAP() 3YT _GW{
}; 'ZDa *9nkF
#endif eB]ZnJ2^=
E0oJ|My
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^$#Q_Y|
#include "stdafx.h" ac&tpvij
#include "Capture.h" 2=3iA09px
#include "CaptureDlg.h" L:^'cl}
G
#include <windowsx.h> Vk_L*lcN
#pragma comment(lib,"hook.lib") (~#PzE:
#ifdef _DEBUG zu|pL`X
#define new DEBUG_NEW :!A@B.E
#undef THIS_FILE z(%Zji@!N
static char THIS_FILE[] = __FILE__; W4YC5ZH{l
#endif krl yEAK=
#define IDM_SHELL WM_USER+1 >$"bwr}'4B
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /cjf 1Dc
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H+0 *
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A qm0|GlJ
class CAboutDlg : public CDialog er<~dqZ}]
{ (Pu*[STTT
public: G/`_$ c
CAboutDlg(); XnG!T$
// Dialog Data V?rI,'F>N
//{{AFX_DATA(CAboutDlg) ]JM9 ^F
enum { IDD = IDD_ABOUTBOX }; HxM-VK '
//}}AFX_DATA !{3pp
// ClassWizard generated virtual function overrides qzyQ2a_p
//{{AFX_VIRTUAL(CAboutDlg) i gQyn|
protected: =Tj0dfO|"
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n_+Iw,a'm
//}}AFX_VIRTUAL <St`"H
// Implementation (HJ60Hj
protected: Yp;x
//{{AFX_MSG(CAboutDlg) "{:*fI;!
//}}AFX_MSG _6[NYv$"
DECLARE_MESSAGE_MAP() L`p[Dq.
}; CRf^6k_;(
{M$8V~8D
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %q!nTGU~
{ @rdC/=Y[
//{{AFX_DATA_INIT(CAboutDlg) fAm2ls7c
//}}AFX_DATA_INIT lk'RWy"pw
} =Vv{ td
& 3a+6!L[
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l%:_#1?isf
{ " h#=ctCx"
CDialog::DoDataExchange(pDX); F`N*{at
//{{AFX_DATA_MAP(CAboutDlg) 2-6-kS)c
//}}AFX_DATA_MAP O|/tRkDMP{
} lDA%M3(p
i}YnJ
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @GV^B'}*
//{{AFX_MSG_MAP(CAboutDlg) 1hN!
2Y:
// No message handlers _1Eyqh`oh
//}}AFX_MSG_MAP ls5S9R 5
END_MESSAGE_MAP() Cm&itG
Tv KX8 m"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) aG ,uF
: CDialog(CCaptureDlg::IDD, pParent) &V;a:
{ .6hH}BM
//{{AFX_DATA_INIT(CCaptureDlg) Mu%'cwp$
m_bControl = FALSE; 4H:WpW*r
m_bAlt = FALSE; -_}EQ9Q
m_bShift = FALSE; ?\yo~=N^
m_Path = _T("c:\\"); prWid3}
m_Number = _T("0 picture captured."); 'SY&-<t(
nCount=0; 3_ >R's8P
bRegistered=FALSE; }0TY
bTray=FALSE; F,bl>;{[{
//}}AFX_DATA_INIT t>[r88v
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h
Na<LZ
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); wVVe L$28
} jL8zH
/IC'R"V a
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) g,;MV7yE
{ JB|I/\(A
CDialog::DoDataExchange(pDX); B?M+`;
//{{AFX_DATA_MAP(CCaptureDlg) y/FisX
DDX_Control(pDX, IDC_KEY, m_Key); )v9[/
]*P
DDX_Check(pDX, IDC_CONTROL, m_bControl); qq`RfZjL
DDX_Check(pDX, IDC_ALT, m_bAlt); \z{Y(dS
DDX_Check(pDX, IDC_SHIFT, m_bShift); |bk*Lgkzw
DDX_Text(pDX, IDC_PATH, m_Path); U!5@$Fu
DDX_Text(pDX, IDC_NUMBER, m_Number); anvj{1
//}}AFX_DATA_MAP 2*M*<p=v
} x\%egw
xv:?n^yt.[
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) jBC9Vt;B
//{{AFX_MSG_MAP(CCaptureDlg) A>?fbY2n
ON_WM_SYSCOMMAND() oxzNV&D[{`
ON_WM_PAINT() 7I|%GA_
ON_WM_QUERYDRAGICON() g U?)
ON_BN_CLICKED(ID_ABOUT, OnAbout) *t_&im%E
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =6sXZ"_Tw
ON_BN_CLICKED(ID_CHANGE, OnChange) s:ruCS
//}}AFX_MSG_MAP J-}NFWR;t
END_MESSAGE_MAP() r)t^qhn
)~/U+,
BOOL CCaptureDlg::OnInitDialog() VPHCPGrk
{ -:,h8JyMP
CDialog::OnInitDialog(); r>Ln*R,9D
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I ?>#neHc6
ASSERT(IDM_ABOUTBOX < 0xF000); <%z/6I
Af|
CMenu* pSysMenu = GetSystemMenu(FALSE); /K^cU;E,
if (pSysMenu != NULL) (Y>MsqwWfC
{ xR:h^S^W ~
CString strAboutMenu; ueR42J%s
strAboutMenu.LoadString(IDS_ABOUTBOX); .bE,Q9:
if (!strAboutMenu.IsEmpty()) B /W$RcV
{ .H"hRYPC?
pSysMenu->AppendMenu(MF_SEPARATOR); \ p$0
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); j1ZFsTFMWp
} 9)">()8
} 6fkr!&Dy7
SetIcon(m_hIcon, TRUE); // Set big icon Cu:Zn%
SetIcon(m_hIcon, FALSE); // Set small icon U]|q4!WE
m_Key.SetCurSel(0); AJT0)FCpR
RegisterHotkey(); v\ Ljm,+
CMenu* pMenu=GetSystemMenu(FALSE); |=LkV"_v
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FT~^$)8=
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4i,SiFKB
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Bu1z$#AC
return TRUE; // return TRUE unless you set the focus to a control k3 l
} f[IchCwX
sD8S2
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]lUu%<-;
{ GcnY=%L?
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ZkW@ |v
{ ju]]|
CAboutDlg dlgAbout; &wN
2l-
dlgAbout.DoModal(); #E9['Jn Z
} 'l|_$3
else [R4x[36Zp
{ Wv"tAseu
CDialog::OnSysCommand(nID, lParam); kre&J
} $1+K}tP
} 5F"?]'*/
Z+"&{g
void CCaptureDlg::OnPaint() N^+ww]f?
{ 6mdnEmFM]
if (IsIconic())
F"x O0t
{ oui!fTy
CPaintDC dc(this); // device context for painting L2'd sOn
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :2E1aVo4b
// Center icon in client rectangle j&A3s{S4A
int cxIcon = GetSystemMetrics(SM_CXICON); 2~V Im#
int cyIcon = GetSystemMetrics(SM_CYICON); d8HB2c5y0i
CRect rect; }&DB5M
GetClientRect(&rect); =[JN'|Q+
int x = (rect.Width() - cxIcon + 1) / 2; sw|:Z(`
int y = (rect.Height() - cyIcon + 1) / 2; hZ<btN.y5
// Draw the icon cA?
x(
dc.DrawIcon(x, y, m_hIcon); |L;psK
} \'Ta8
else zU~..;C
{ <im<(=m9
CDialog::OnPaint(); vLuQe0l{
} ;YDF*~9u
} hyiMOa
_wNPA1q0J
HCURSOR CCaptureDlg::OnQueryDragIcon() b`W*vduf
{ |*KS<iHr%
return (HCURSOR) m_hIcon; "<x~{BN?
} lGUV(D
oDP((I2-
void CCaptureDlg::OnCancel() </gp3WQ.
{ e({fY.)SGo
if(bTray) S2E HmE&
DeleteIcon(); PuCDsojclh
CDialog::OnCancel();
4|N\Q=,
} o^Yspp
vQ"s
void CCaptureDlg::OnAbout() `8;,&<U'`
{ ~AanU1U<
CAboutDlg dlg; cTd;p>:>m
dlg.DoModal(); _AYC|R|
} ]"Y%M'
3]<re{)J9O
void CCaptureDlg::OnBrowse() *frJ^ Ws{
{ S9R]Zl7{-
CString str; k0_$M{@Y
BROWSEINFO bi; qQOD
char name[MAX_PATH]; <m,yFk
ZeroMemory(&bi,sizeof(BROWSEINFO)); K;p<f{PE
bi.hwndOwner=GetSafeHwnd(); #we>75l{+R
bi.pszDisplayName=name; RR!!hY3 K
bi.lpszTitle="Select folder"; +xfW`[.{
bi.ulFlags=BIF_RETURNONLYFSDIRS; +'/}[1q1/T
LPITEMIDLIST idl=SHBrowseForFolder(&bi); (\t_Hs::a
if(idl==NULL) 12sD|j
return; @GQ8q]N:<
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VtO;UN
str.ReleaseBuffer(); VS|("**
m_Path=str; 7TkxvSL X
if(str.GetAt(str.GetLength()-1)!='\\') ;Q=GJ5`B
m_Path+="\\"; c~UAr k S
UpdateData(FALSE); i9eyrl+!
} s
S5fd)x
ydND$@; Z
void CCaptureDlg::SaveBmp() HNy/ -
{ x8?x/xE
CDC dc; <*"pra{3
dc.CreateDC("DISPLAY",NULL,NULL,NULL); pzq;vMr
CBitmap bm; pEVgJ/>
int Width=GetSystemMetrics(SM_CXSCREEN); #[a"%byTR
int Height=GetSystemMetrics(SM_CYSCREEN); ) wY!/&
bm.CreateCompatibleBitmap(&dc,Width,Height); g&+Y{*Gp
CDC tdc; qC1U&b#MVx
tdc.CreateCompatibleDC(&dc); 7q!yCU
CBitmap*pOld=tdc.SelectObject(&bm); tB7K&ssi
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6W;?8Z_1
tdc.SelectObject(pOld); bug Fl>
BITMAP btm; %,,`N I{
bm.GetBitmap(&btm); ;wXY3|@
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3XwU6M$5g
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^'&iYV
BITMAPINFOHEADER bih; =r@gJw:B
bih.biBitCount=btm.bmBitsPixel; a1G9wC:e
bih.biClrImportant=0; *i?rJH
bih.biClrUsed=0; |vfujzRZ
bih.biCompression=0; +z|UpI
bih.biHeight=btm.bmHeight; jefNiEE[
bih.biPlanes=1; -
LiPHHX<
bih.biSize=sizeof(BITMAPINFOHEADER); LMFK3Gd[
bih.biSizeImage=size; >H}jR[H'
bih.biWidth=btm.bmWidth; OyJsz]b} M
bih.biXPelsPerMeter=0; .3a:n\tY
bih.biYPelsPerMeter=0; .6#cDrK
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /z1p/RiX
static int filecount=0; IAP/G5'Q
CString name; C[xJU6z
name.Format("pict%04d.bmp",filecount++); 1t~FW-:
name=m_Path+name; Y .
BITMAPFILEHEADER bfh; {b'}:aMc
bfh.bfReserved1=bfh.bfReserved2=0; hG3m7ht
bfh.bfType=((WORD)('M'<< 8)|'B'); A{z>D`d
bfh.bfSize=54+size; 3+(yI 4
bfh.bfOffBits=54; _k_>aG23
CFile bf; xN`r4
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ aGB0-;.t7
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /WgPXE B
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =Y&9
qt
bf.WriteHuge(lpData,size); w dGpt_
bf.Close(); LBmM{Gu
nCount++; 9DOkQnnc
} 7`IUMYl#~
GlobalFreePtr(lpData); "H>r-cyh
if(nCount==1) jq57C}X}2
m_Number.Format("%d picture captured.",nCount); E3S%s
else 4D^ M<Xn
m_Number.Format("%d pictures captured.",nCount); =`qRu
UpdateData(FALSE);
#%?FM>
} #)^^_
]8$#qDS@
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]By0Xifew
{ |*^8~u3J"
if(pMsg -> message == WM_KEYDOWN) uW}Hvj;0a*
{ URYZV8=B~
if(pMsg -> wParam == VK_ESCAPE) =U4f}W;
return TRUE; &|Lh38s@$#
if(pMsg -> wParam == VK_RETURN) #puQi
return TRUE; \G$QNUU
} @[MO,J&h
return CDialog::PreTranslateMessage(pMsg); kS B
} +
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#K=b%;>
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7hB#x]oQo
{ 59{;VY81
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >u=%Lz"J
SaveBmp(); -7>^
rR V
return FALSE; `"a? a5]k
} 1.'(nKoq
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |DN^NhtE
CMenu pop; K;oV"KRK
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); o]Z
_@VI
CMenu*pMenu=pop.GetSubMenu(0); gtD
pMenu->SetDefaultItem(ID_EXITICON); t< sp%zXZ
CPoint pt; w&p~0cA~
GetCursorPos(&pt); _*s~`jn{H
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (y1$MYZQ
if(id==ID_EXITICON) j~Q}F |i8
DeleteIcon(); sYGR-:K
else if(id==ID_EXIT) HSNOL
OnCancel(); m6b$Xyq[
return FALSE; Ri|k<io
} M_k`%o
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8
AFMn[{
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) JC=dYP}
AddIcon(); C<_Urnmn
return res; 60"5?=D
} jm+ V$YBP
A9
U5,mOz
void CCaptureDlg::AddIcon() (tepmcf
{ s(t eQ\
NOTIFYICONDATA data; xEjx]w/&
data.cbSize=sizeof(NOTIFYICONDATA); U+-F*$PO+
CString tip; Pp,Um(
tip.LoadString(IDS_ICONTIP); mge#YV::
data.hIcon=GetIcon(0); n_v02vFAHT
data.hWnd=GetSafeHwnd(); Hi^35
strcpy(data.szTip,tip); J*5hf: ?i
data.uCallbackMessage=IDM_SHELL; 14mf}"z\
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >K\3*]>J3
data.uID=98; o&~dGG4J
Shell_NotifyIcon(NIM_ADD,&data); BU`ckK\(
ShowWindow(SW_HIDE); )X/*($SuA
bTray=TRUE; vX ?aB!nkw
} _=pWG^a
S+r^B?a<oM
void CCaptureDlg::DeleteIcon() 0!pJ5q ,A
{ wfE^Sb3
NOTIFYICONDATA data; 7%e1cI
data.cbSize=sizeof(NOTIFYICONDATA); nE_Cuc>K\
data.hWnd=GetSafeHwnd(); yq?]V7~
data.uID=98; kd yAl,
Shell_NotifyIcon(NIM_DELETE,&data); FC{})|yh
}
ShowWindow(SW_SHOW); a0PE^U
SetForegroundWindow(); `M:DZNy,
ShowWindow(SW_SHOWNORMAL); xk& NAB
bTray=FALSE; <Z},A-\S*
} J,??x0GDx,
wTxbDT@ H5
void CCaptureDlg::OnChange() I_ONbJ9]
{ dPsLZ"I
RegisterHotkey(); x>v-m*4Z4@
} S_6g~PHsr
)IHG6}<
BOOL CCaptureDlg::RegisterHotkey() Nb0Ik/:<
{ O$^xkv5.
UpdateData(); OZf6/10O/
UCHAR mask=0; Zae.MO^C!
UCHAR key=0; k0JW[04j
if(m_bControl) S<"oUdkz
mask|=4; %)?`{O~ h
if(m_bAlt) zVw:7-
mask|=2; Or7
mD
if(m_bShift) EkjgNEXq
mask|=1; V43TO
key=Key_Table[m_Key.GetCurSel()]; SrF x_n
if(bRegistered){ |d[5l^6
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q=WySIF.
bRegistered=FALSE; lCR!:~
} nob0T5G
cMask=mask; M ,`w A
cKey=key; zEj#arSE4
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?E6^!4=,
return bRegistered; qw<HY$3=
} /&r|ec5
+"dv7
四、小结 KFU%DU G
V,Q4n%h1.
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。