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:
zgD?e?yPO
HT<p=o'$Z 一、实现方法
; Y/nS u\LNJo| B 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:
6Bq_<3P_ 5CK+\MK #pragma data_seg("shareddata")
A f'&, 1=q HHOOK hHook =NULL; //钩子句柄
sL@\,]Y UINT nHookCount =0; //挂接的程序数目
SZGR9/*^ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
BX_yC=S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
ns~]a:1yh static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
?%3dgQB' static int KeyCount =0;
^ITF* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Sk{skvd; #pragma data_seg()
rHKO13WF d(IJ-qJN 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。
il^;2`]& qU26i"GHp 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_KO xV:<` _[rFnyC+0V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ebA95v`Vms cKey,UCHAR cMask)
$+j1^ {
suE K;Bk9 BOOL bAdded=FALSE;
Nu7>G for(int index=0;index<MAX_KEY;index++){
7O1MC 8{ if(hCallWnd[index]==0){
'$FF/|{ hCallWnd[index]=hWnd;
oAO{4xP HotKey[index]=cKey;
XG|N$~N+ 2 HotKeyMask[index]=cMask;
(d4btcg bAdded=TRUE;
V]|X
,G KeyCount++;
[8T{=+k break;
Y`~B> J }
cWW?@_ }
8 a]'G)(ts return bAdded;
;JxL>K( }
"_/ih1z] //删除热键
puPI^6y% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
97liSd {
^J]&($- BOOL bRemoved=FALSE;
`W86]ut[ for(int index=0;index<MAX_KEY;index++){
k`5I"-e if(hCallWnd[index]==hWnd){
1(p:dqGS if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
^ ]9K>} hCallWnd[index]=NULL;
_}R9!R0O HotKey[index]=0;
96w2qgc2 HotKeyMask[index]=0;
bK:U:vpYm bRemoved=TRUE;
A8f.h5~9 KeyCount--;
[9
MH"\ break;
Wt/;iq" }
U:8[%a }
t7by OMC }
s4bV0k return bRemoved;
i~h@}0WR" }
y#'hOSR2 )$] lf } 1AAyzAP9` DLL中的钩子函数如下:
i#-v4g l cl|o3yQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
hDxq9EF {
#Hrzk!&9 BOOL bProcessed=FALSE;
L/"MRQ" if(HC_ACTION==nCode)
H,} &=SCk {
W6<oy if((lParam&0xc0000000)==0xc0000000){// 有键松开
F! !HwI switch(wParam)
%u!=<yn' {
xr'1CP case VK_MENU:
[6a-d>e{ MaskBits&=~ALTBIT;
l!*_[r break;
l~E~! MR case VK_CONTROL:
Ef] Hpjvp MaskBits&=~CTRLBIT;
vH+g*A0S< break;
tA#Pc6zBuC case VK_SHIFT:
:|;@FkQ MaskBits&=~SHIFTBIT;
[v~,|N>w break;
coAXYn default: //judge the key and send message
Y(Oh7VwY*P break;
lp}S'^ y }
ujV{AF`JfB for(int index=0;index<MAX_KEY;index++){
N,TV?Q5l7 if(hCallWnd[index]==NULL)
;TL.QN/l continue;
,4'gj0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H*0Y_H= {
c`<2&ke SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3y)\dln bProcessed=TRUE;
2j+w5KvU }
~xd?y*gk; }
9[/0 }
[rx9gOOa& else if((lParam&0xc000ffff)==1){ //有键按下
mGE!,!s} switch(wParam)
I/7!5Z* {
t^'nh
1= case VK_MENU:
F'XQoZ* 1 MaskBits|=ALTBIT;
M">v4f&K1! break;
jz8u'y[n7 case VK_CONTROL:
k ]NZ%. MaskBits|=CTRLBIT;
8R*;8y_ break;
AA5G`LiT case VK_SHIFT:
Um+_S@h MaskBits|=SHIFTBIT;
k o@ej^ break;
L"ho|v9: default: //judge the key and send message
`N\ ^JAGW break;
:{a< ~n` }
pyhXET
' for(int index=0;index<MAX_KEY;index++){
>W> rhxU if(hCallWnd[index]==NULL)
}r,M(Zr continue;
h:fiUCw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
vx9!KWy} {
4AJ] qu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
D_lRYLA+ bProcessed=TRUE;
dWd%>9}
}
;g0s1nz }
rMwa6ZO'm; }
jf3Zy:*K if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
n=!T(Hk for(int index=0;index<MAX_KEY;index++){
4K^cj2X if(hCallWnd[index]==NULL)
== wX.y\.n continue;
\dHqCQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!R@LC SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
58Ibje //lParam的意义可看MSDN中WM_KEYDOWN部分
?"@Fq2xgB4 }
v*.R<-X: }
)=f}vHg$ }
&>qUT]w return CallNextHookEx( hHook, nCode, wParam, lParam );
7$<pdayd }
-jJhiaJ$< h8(#\E 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:
z)T-<zWO; [+o{0o> BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Kxr{Nx BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Bj7*2} y11^q*} 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:
1]If<
< oEX,\@+u LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
M@TG7M7Os {
Fu.aV876\f if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
&6\&McmkX {
yu6~:$%H //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
9(]_so24, SaveBmp();
cB,^?djJ3 return FALSE;
cx:_5GF }
[h-6;.e …… //其它处理及默认处理
wKpGJ&
{ }
i6paNHi* 0se%|Z|8 F/2cQ.u2 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。
tz]0F5 r $S9/ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
@_`r*Tb)dM "[ LUv5 二、编程步骤
A}Iyl L9/'zhiZBx 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
)FwOg;=3M" SGl|{+(A 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
U)kyq mH,s!6j?Vp 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
])?dqgwa B<s+I# 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Hs)] cPtDIc, 5、 添加代码,编译运行程序。
#N`'hPD} W^elzN(
三、程序代码
D&m1yl@\J dFg&|Lp ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
"dCIg{j #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
b!g)/%C
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
9-n]_AF`0 #if _MSC_VER > 1000
t'F$/mx. #pragma once
>IQ&*Bb #endif // _MSC_VER > 1000
+_:p8,
5o #ifndef __AFXWIN_H__
|!K&h(J| #error include 'stdafx.h' before including this file for PCH
|6NvByc, #endif
:vi %7 #include "resource.h" // main symbols
cPIyD?c class CHookApp : public CWinApp
L^e*_q2d:> {
05ZYOs } public:
u0R[TA3 CHookApp();
.:H'9QJg // Overrides
w'}s'gGE // ClassWizard generated virtual function overrides
TJNE2 //{{AFX_VIRTUAL(CHookApp)
"|i1 AR:I public:
{Q/@ Y.~< virtual BOOL InitInstance();
08:K9zr virtual int ExitInstance();
yHM29fEZk //}}AFX_VIRTUAL
-rsS_[$2 //{{AFX_MSG(CHookApp)
cMi9 Z] // NOTE - the ClassWizard will add and remove member functions here.
`T[yyOL/ // DO NOT EDIT what you see in these blocks of generated code !
h`fZ8|yw //}}AFX_MSG
2^s@n3t DECLARE_MESSAGE_MAP()
r;f\^hVy };
NHZMH!=4:n LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
% /zHL?RqJ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z*nztvY@e BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
rREev BOOL InitHotkey();
yzpa\[^ BOOL UnInit();
3>(~5 #endif
M/V"Ke"N F-Z>WC{+ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Q9y|1Wg1W #include "stdafx.h"
iP7KM*ks #include "hook.h"
e7G>'K #include <windowsx.h>
pnz@;+f #ifdef _DEBUG
IAd^$9 #define new DEBUG_NEW
.*k!Zl* #undef THIS_FILE
^?%ThPo_ static char THIS_FILE[] = __FILE__;
<\:*cET3 #endif
fR.raI4et #define MAX_KEY 100
nb5%a #define CTRLBIT 0x04
rGH7S!\AM #define ALTBIT 0x02
F`Vp #define SHIFTBIT 0x01
0wBr_b! #pragma data_seg("shareddata")
zh !/24p9 HHOOK hHook =NULL;
JmF`5 UINT nHookCount =0;
J!rZskd static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@TKQ_7BcB static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
7({.kD6 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
$o\Uq static int KeyCount =0;
"z.!h(Eq static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
y^p%/p% #pragma data_seg()
17Q*
<iCs HINSTANCE hins;
j@Us7Q)A( void VerifyWindow();
nkk GJV! BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
tORDtMM9+ //{{AFX_MSG_MAP(CHookApp)
GmGq69]J* // NOTE - the ClassWizard will add and remove mapping macros here.
0@f7`D // DO NOT EDIT what you see in these blocks of generated code!
"2"*3R<Y //}}AFX_MSG_MAP
)fZ5.W8UE] END_MESSAGE_MAP()
@7PE&3 `0ju=FP'u5 CHookApp::CHookApp()
A&'HlI%J {
F0NNS!WP7^ // TODO: add construction code here,
DA4!-\bt@ // Place all significant initialization in InitInstance
J! eVw\6 }
nfvs"B; I^A01\p CHookApp theApp;
S67T:ARS LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
FH H2 {
zGFW?|o< BOOL bProcessed=FALSE;
[TV"mA if(HC_ACTION==nCode)
}\ui}\ {
^_Z Qf if((lParam&0xc0000000)==0xc0000000){// Key up
:kI
x?cc switch(wParam)
X 'bp?m {
}Lwj~{ case VK_MENU:
.yj=*N. MaskBits&=~ALTBIT;
48%a${Nvvj break;
Ah2XwFg? case VK_CONTROL:
T{K+1SPy4 MaskBits&=~CTRLBIT;
aEZn6k1 break;
+FVcrL@ case VK_SHIFT:
l:+pO{7L MaskBits&=~SHIFTBIT;
<Q-ufF85) break;
Mz{ Rh+gS default: //judge the key and send message
!"J* break;
tbv6-)Hs }
g?o$:>c for(int index=0;index<MAX_KEY;index++){
/[#{#:lo2 if(hCallWnd[index]==NULL)
;/{Q4X{ continue;
I0jEhg%JZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Iei4yDv ; {
LRd,7P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
XWy
iS\ bProcessed=TRUE;
v:T` D }
8UL:C?eY }
.}y
Lz }
#WpO9[b> else if((lParam&0xc000ffff)==1){ //Key down
yxQAO_C switch(wParam)
\&qVr1| {
0Rk'sEX, case VK_MENU:
TAC\2*bWje MaskBits|=ALTBIT;
LP)mp cQ break;
ptq{$Y{_ case VK_CONTROL:
u]MF
r2 MaskBits|=CTRLBIT;
LA@}{hU break;
x}>tX case VK_SHIFT:
hJ4.: MaskBits|=SHIFTBIT;
<,hBoHZSL break;
ze\~-0ks+ default: //judge the key and send message
/7"1\s0 U break;
|95/'a* }
`oz7Q(` for(int index=0;index<MAX_KEY;index++)
246lFxG. {
/+1Fa): if(hCallWnd[index]==NULL)
QBn>@jq continue;
&{=~)>h if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0j/81Y}p {
xNqQbkF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
h'fD3Gr& bProcessed=TRUE;
Sf'5/9<DW+ }
w+$gY?% }
q(p0#Mk,E }
|uZ=S]V@ if(!bProcessed){
tr/dd&(Y1 for(int index=0;index<MAX_KEY;index++){
J+|ohA if(hCallWnd[index]==NULL)
q@-qA] continue;
@>:07]Dxo if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
imhq*f#A[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
l?1!h2z% }
/[IQ:':^ }
l{a&Zy) }
\mu9ikZ< return CallNextHookEx( hHook, nCode, wParam, lParam );
XP^6*}H.* }
7~Ga>BK yl ;'Ru: BOOL InitHotkey()
^[Er%yr0 {
3ElpS^2W if(hHook!=NULL){
9c7}-Go nHookCount++;
XZ&v3ul return TRUE;
Yr= mLT|JN }
S7q&|nI else
2!otVz!Mh hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
">QY'r if(hHook!=NULL)
bgK(l d` nHookCount++;
QPcB_wUqu return (hHook!=NULL);
>oNk(.
% }
Z%{f[|h9} BOOL UnInit()
GDB>!ukg {
U44H/5/ if(nHookCount>1){
)x7hhEk=^ nHookCount--;
*vO'Z & return TRUE;
oX4uRc7wR }
e,*[5xQ BOOL unhooked = UnhookWindowsHookEx(hHook);
;2|H6IN" if(unhooked==TRUE){
/_a *C.a6 nHookCount=0;
Aii[=x8 hHook=NULL;
.KsvRx }
FOA%(5$4 return unhooked;
Fb'wC }
u"gp"> `j![ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*a%PA(%6 {
,s76]$%4 BOOL bAdded=FALSE;
Q8q_w2s, for(int index=0;index<MAX_KEY;index++){
_D4}[` if(hCallWnd[index]==0){
S%fBt?-Cm hCallWnd[index]=hWnd;
7dJaWD:& HotKey[index]=cKey;
k-e@G' HotKeyMask[index]=cMask;
~QcKW<bz bAdded=TRUE;
G]1pGA; KeyCount++;
%nh'F6bNgv break;
R4(8]oUW }
/6c10}f }
P[K=']c return bAdded;
m^.C(} }
%p60pn[( 1F,_L}=o1s BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
k#) .E X {
&zcjU+n BOOL bRemoved=FALSE;
Sh6Cw4 R for(int index=0;index<MAX_KEY;index++){
Vgn1I(Gj 4 if(hCallWnd[index]==hWnd){
ZRm\d3x4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
bVHi3=0{ hCallWnd[index]=NULL;
|pR$' HO HotKey[index]=0;
[;AcV73 HotKeyMask[index]=0;
\AzcW;03g[ bRemoved=TRUE;
AyO|9!F@A KeyCount--;
_[o^23Hj break;
Ig KAD#2a }
h,'+w }
2QRn
c" }
|=T<WU1$ return bRemoved;
q*nz4QTOE }
W@dY:N} uP2a\C,$ void VerifyWindow()
odf^W
{
,P@-DDJ for(int i=0;i<MAX_KEY;i++){
*$C[![ if(hCallWnd
!=NULL){ yWtr,
if(!IsWindow(hCallWnd)){ HjS^
nYl
hCallWnd=NULL; kG$8E
HotKey=0; =+S3S{\CK
HotKeyMask=0; .boizW1+
KeyCount--; o~&!M_ED
} ha! "BR
} 9/(c cj
} \Egc5{
} by[i"!RCu
i%4k5[f.:
BOOL CHookApp::InitInstance() -z$2pXT ^
{ HbfB[%
AFX_MANAGE_STATE(AfxGetStaticModuleState()); y?#J`o-
O
hins=AfxGetInstanceHandle(); B!ibE<7,
InitHotkey(); g+)\/n|
return CWinApp::InitInstance(); yKEFne8^
} ,D2_Z]
hyfnIb@~}
int CHookApp::ExitInstance() PZRn6Tc
{ .{a2z*o
VerifyWindow(); *;E+9^:V
UnInit(); {b0&qV
return CWinApp::ExitInstance(); 'A!/pUML
} F(~_L.
$uK"@Mw
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file */y]!<\v!k
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E0^%|Mh]b
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "IS^ajaq
#if _MSC_VER > 1000 3,L3C9V'
#pragma once u7P+^A97L_
#endif // _MSC_VER > 1000 cNlY=L
M03i4R@h(
class CCaptureDlg : public CDialog )NmlV99q
{ poYAiq_3T
// Construction <Iyot]E
public: DbU;jorwu
BOOL bTray; [RPAkp
BOOL bRegistered; UW[{d/.wC
BOOL RegisterHotkey(); 0/@ X!|X
UCHAR cKey; Jhy
t)@7/,
UCHAR cMask; 6.h
void DeleteIcon(); 7Ljj#!`lUp
void AddIcon(); =/JF-#n/MA
UINT nCount; 6y,P4O*q
void SaveBmp(); _s^:zPl
CCaptureDlg(CWnd* pParent = NULL); // standard constructor
L|lmStwe
// Dialog Data qJXsf M6
//{{AFX_DATA(CCaptureDlg) Wo9psv7.
enum { IDD = IDD_CAPTURE_DIALOG }; Tb1}XvZ
CComboBox m_Key; 9_WPWFO
BOOL m_bControl; fb.\V]K
BOOL m_bAlt; F:o#
BOOL m_bShift; I,4-
CString m_Path; X0Z-1bs
CString m_Number; -F+P;S
//}}AFX_DATA O0wCb
// ClassWizard generated virtual function overrides ?t0zsq
//{{AFX_VIRTUAL(CCaptureDlg) tG2OVRx8u
public: ' q<EZ{
virtual BOOL PreTranslateMessage(MSG* pMsg); \btR^;_\A
protected: #>m,
Cm
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;[KriW
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Jhsv2,8
{
//}}AFX_VIRTUAL q
X%vRf0
// Implementation
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protected: s w.AfRQP
HICON m_hIcon; mDF"&.(j
// Generated message map functions $rpTs?j*K$
//{{AFX_MSG(CCaptureDlg) ]a6O(]
virtual BOOL OnInitDialog(); Ly)(_Tp@+
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); A`
o?+2s_
afx_msg void OnPaint(); ;j>Vt?:Pw
afx_msg HCURSOR OnQueryDragIcon(); v=.z|QD^1
virtual void OnCancel(); grCO-S|j^
afx_msg void OnAbout(); (!VMnLlXRK
afx_msg void OnBrowse(); xa{<R+LR
afx_msg void OnChange(); Xm8Z+}i
//}}AFX_MSG I51oG:6fR?
DECLARE_MESSAGE_MAP() J(EaE2
}; v-;XyVx
#endif \%Ah^U)gS
=qp}p'BYe
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?wLdW1&PpX
#include "stdafx.h" :Dk@?o@2;C
#include "Capture.h" r!.+XrYg
#include "CaptureDlg.h" i,'Ka[6
#include <windowsx.h> O| 1f^_S/
#pragma comment(lib,"hook.lib") ^s2m\Q(
#ifdef _DEBUG _[TH@fO6:
#define new DEBUG_NEW 'o/N}E!Pt
#undef THIS_FILE P('t6MVlT
static char THIS_FILE[] = __FILE__; "s>fV9YyZ
#endif Foe>}6~{?
#define IDM_SHELL WM_USER+1 XatA8(_,5
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Cgz&@@j,]
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e|b~[|;*=
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; `&u<aLA
class CAboutDlg : public CDialog [Y22Wi
{ Jm %ynW
public: i!Dh&XT
CAboutDlg(); !_U37Uj<m
// Dialog Data [arTx^
//{{AFX_DATA(CAboutDlg) <o&o=Y8
enum { IDD = IDD_ABOUTBOX }; *bCi2mbm@
//}}AFX_DATA a1g6}ym\
// ClassWizard generated virtual function overrides VelB-vy&
//{{AFX_VIRTUAL(CAboutDlg) \6SMn6a4
protected: )@Zc?Da
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /`+Hwdk
//}}AFX_VIRTUAL k<YtoV
// Implementation 8ji^d1G,
protected: v}F4R $
//{{AFX_MSG(CAboutDlg) &gGs) $f[
//}}AFX_MSG 7_Ba3+9jpa
DECLARE_MESSAGE_MAP() (]3ERPn#y
}; Hs"%
S
NqJ<!q)
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ptV4s=G2
{ _{6,.TN
//{{AFX_DATA_INIT(CAboutDlg) ~LawF_]6
//}}AFX_DATA_INIT I!fB1aq-
} cq*p9c
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4? m/*VV
{ 5Noe/6
CDialog::DoDataExchange(pDX); ^oQekga\l
//{{AFX_DATA_MAP(CAboutDlg) Dq/3E-y5
//}}AFX_DATA_MAP 8W~lU~-
} O9t=lrYV!
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DeOXM=&z
//{{AFX_MSG_MAP(CAboutDlg) '8)Wd"[
// No message handlers 9?uqQ
//}}AFX_MSG_MAP :O9P(X*
END_MESSAGE_MAP() Mn]}s:v
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?SC3Vzr
: CDialog(CCaptureDlg::IDD, pParent) uu}a:qrY
{ 1P_Fe[8
//{{AFX_DATA_INIT(CCaptureDlg) 5ZnSA9?
m_bControl = FALSE; Y 3o^Euou
m_bAlt = FALSE; +w "XNl
m_bShift = FALSE; =m`l%V[
m_Path = _T("c:\\"); EfKM*;A
m_Number = _T("0 picture captured."); [O=W>l
nCount=0; "A%MVym."
bRegistered=FALSE; 9;=q=O/
bTray=FALSE; Ur^YG4(
//}}AFX_DATA_INIT 'sj9[o@]
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 r2RBrZ@1
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n}19?K]g
} a*Rz<08
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l<:`~\#
{ "E.\6sC
CDialog::DoDataExchange(pDX); xM&EL>m>L
//{{AFX_DATA_MAP(CCaptureDlg) 1'Nh jL
DDX_Control(pDX, IDC_KEY, m_Key); o
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DDX_Check(pDX, IDC_CONTROL, m_bControl); RNGO~:k?r
DDX_Check(pDX, IDC_ALT, m_bAlt); P,(9cyS{
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~\2;i]|
DDX_Text(pDX, IDC_PATH, m_Path); ucw`;<d8
DDX_Text(pDX, IDC_NUMBER, m_Number); 7g-Dfg.w
//}}AFX_DATA_MAP 4Mk8Cpz
} Y|mW.
1{^CfamF
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [!W5}=^H
//{{AFX_MSG_MAP(CCaptureDlg) y'^F,WTM
ON_WM_SYSCOMMAND() neF8V"-u&
ON_WM_PAINT() LyIKP$t
ON_WM_QUERYDRAGICON() -:MmSeG7gO
ON_BN_CLICKED(ID_ABOUT, OnAbout) $u:<x
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $nj\\,(g
ON_BN_CLICKED(ID_CHANGE, OnChange) V]Sgx00;
//}}AFX_MSG_MAP zei6S
END_MESSAGE_MAP() pg+b[7
4bnt=5]
BOOL CCaptureDlg::OnInitDialog()
R6 ;jY/*#
{ \fTTkpM
CDialog::OnInitDialog(); fTBVvY4(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); k!&:(]
ASSERT(IDM_ABOUTBOX < 0xF000); z^'n*h
CMenu* pSysMenu = GetSystemMenu(FALSE); 7m\vRMK
if (pSysMenu != NULL) -!l^]MU
{ L${m/@9
CString strAboutMenu; :WVSJ,. !
strAboutMenu.LoadString(IDS_ABOUTBOX); OZ=Cp$
if (!strAboutMenu.IsEmpty()) ^_sQG
{ M_Bu,<q^
pSysMenu->AppendMenu(MF_SEPARATOR); rS4%$p"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); CI^[I\$&
} teAukE=}
} H37QgApB
SetIcon(m_hIcon, TRUE); // Set big icon n&$/Q$d&
SetIcon(m_hIcon, FALSE); // Set small icon Bhe{L?}0
m_Key.SetCurSel(0); fH[Wkif
RegisterHotkey(); G{+2xN
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CMenu* pMenu=GetSystemMenu(FALSE); z|I0-1tAK
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9p4y>3
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X &D{5~qC
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NEw$q4
return TRUE; // return TRUE unless you set the focus to a control ~cIl$b
} a$}NW.
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void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o,1Dqg4P3
{ 3
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if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~g7m3
{ <[ZI.+_Wt
CAboutDlg dlgAbout; =G4u#t)
dlgAbout.DoModal(); { D+Ym%n
} w.z<60%},0
else ~@D/A/|
{ A@2Bs5F
CDialog::OnSysCommand(nID, lParam); q*bt4,D&Es
} tb,9a!?
} P\AqpQv
t+O e)Ns
void CCaptureDlg::OnPaint() ,:UX<6l
R
{ {jW%P="z$"
if (IsIconic()) i $C-)d]
{ lI6W$V\,
CPaintDC dc(this); // device context for painting &n>7Ir
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <^c3}
// Center icon in client rectangle f@d9Hqr+l;
int cxIcon = GetSystemMetrics(SM_CXICON); yQ%"U^.m
int cyIcon = GetSystemMetrics(SM_CYICON); moZm0`WR
CRect rect; D"^'.DL@wG
GetClientRect(&rect); e)b%`ntF
int x = (rect.Width() - cxIcon + 1) / 2; gi$XB}L+X
int y = (rect.Height() - cyIcon + 1) / 2; I ]9C_
// Draw the icon \f%.n]>
dc.DrawIcon(x, y, m_hIcon); 8EI:(NE*J
} "%@v++4y
else
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{ ),`8eQC
CDialog::OnPaint(); v+6e;xl8
}
z)w-N
} :G=FiC
t7*#[x)a
HCURSOR CCaptureDlg::OnQueryDragIcon() ^~1<f1(
{ .3X Y&6
return (HCURSOR) m_hIcon; gCJIIzl%Bh
} '!Wvqs
pO]8
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void CCaptureDlg::OnCancel() cG_Vc[
{ q.W>4 k
if(bTray) q7_+}"i
DeleteIcon(); ?JXa~.dA
CDialog::OnCancel(); wxdyF&U
n
} %u!b& 5]e
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void CCaptureDlg::OnAbout() suVmg-d
{ JN(-.8<
CAboutDlg dlg; ,b|-rU\
dlg.DoModal(); Qihdn66
} Vte EDL/w
/.Q4~Hw%}
void CCaptureDlg::OnBrowse() )(TAT<
{ 2*1ft>Uty
CString str; 7x k|+!
BROWSEINFO bi; 75NRCXh.
char name[MAX_PATH];
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ZeroMemory(&bi,sizeof(BROWSEINFO)); ."6[:MF
bi.hwndOwner=GetSafeHwnd(); lr3mE
bi.pszDisplayName=name; d%ME@6K)
bi.lpszTitle="Select folder"; Hj6'pJ4
bi.ulFlags=BIF_RETURNONLYFSDIRS; D/ Dt
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Vw~\H Gs/~
if(idl==NULL) RE"^
)-
return; cUk*C
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \?lz&<
str.ReleaseBuffer(); 5v
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m_Path=str; lFq{O;q7}
if(str.GetAt(str.GetLength()-1)!='\\') +!yXTC
m_Path+="\\"; bw S*]!*
UpdateData(FALSE); z&}-8JykH
} |J>WC}g@n
s V
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void CCaptureDlg::SaveBmp() =RKSag&
{ f.xA_Y>
CDC dc; 8dO?K*J,H'
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0. ;}]v
CBitmap bm; Q8nId<\(
int Width=GetSystemMetrics(SM_CXSCREEN); j6YiE~
int Height=GetSystemMetrics(SM_CYSCREEN); ]?LB?:6
bm.CreateCompatibleBitmap(&dc,Width,Height); 5V5w:U>_z
CDC tdc; S Xr%kndS
tdc.CreateCompatibleDC(&dc); 9pD
7 f`
CBitmap*pOld=tdc.SelectObject(&bm); #R&H&1
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4N>>+]MWc
tdc.SelectObject(pOld); K8[DZ)rO;Z
BITMAP btm; 1hmc,c
bm.GetBitmap(&btm); )!W45"l-3M
DWORD size=btm.bmWidthBytes*btm.bmHeight; CIC[1,
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9A$m$
BITMAPINFOHEADER bih; cgT
bih.biBitCount=btm.bmBitsPixel; s0"e'
bih.biClrImportant=0; u{e-G&]^;
bih.biClrUsed=0; \>Zvev!s
bih.biCompression=0; @N.jB#nEb
bih.biHeight=btm.bmHeight; >U!*y4
bih.biPlanes=1; 5M_Wj*a}7
bih.biSize=sizeof(BITMAPINFOHEADER); 6lFfS!ZFA
bih.biSizeImage=size; rf
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bih.biWidth=btm.bmWidth; Ol/N}M|3
bih.biXPelsPerMeter=0; nsuX*C7
bih.biYPelsPerMeter=0; S4o$t-9l
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9Kv|>#zff
static int filecount=0; j`>^1Q
CString name; Y%aWK~O
name.Format("pict%04d.bmp",filecount++); rZ03x\2
name=m_Path+name; -ysn&d\rV
BITMAPFILEHEADER bfh; [2c{k
bfh.bfReserved1=bfh.bfReserved2=0; vqdX^m^PY
bfh.bfType=((WORD)('M'<< 8)|'B');
zj{s}*
bfh.bfSize=54+size; Yl^mAS[w&
bfh.bfOffBits=54; _}6q{}jn:c
CFile bf; E/b"RUv}h
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Gh(
A%x)
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); t?eH'*>
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $lwz-^1t.
bf.WriteHuge(lpData,size); )%Iv[TB[
bf.Close(); YwDt.6(+,
nCount++; ^QXbJJ
} Dm0a.J v
GlobalFreePtr(lpData); n6Z|Q@F
if(nCount==1) Y3U9:VB
m_Number.Format("%d picture captured.",nCount); +cu^%CXT
else k!L@GQ
m_Number.Format("%d pictures captured.",nCount); zTm]AG|0
UpdateData(FALSE); ^A_;#vK
} {8RFK4! V@
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g_.^O$}
{ QG
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if(pMsg -> message == WM_KEYDOWN) A;X=bj _&a
{ 45 >XKr.%
if(pMsg -> wParam == VK_ESCAPE) chI.{Rj
return TRUE; PL=^}{r
if(pMsg -> wParam == VK_RETURN) @C8DZ5)
return TRUE; HL K@xKD<
} _8?o'<!8?^
return CDialog::PreTranslateMessage(pMsg); =r.
>N\
} P ,mN >
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #
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{ QO;4}rq
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KW3+luI6
SaveBmp(); Li{~=S@N*
return FALSE; )7c b6jCU
} _.)eL3OF
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )6X.Nfkb^k
CMenu pop; -7qIToO.
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); fz_nsVD
CMenu*pMenu=pop.GetSubMenu(0);
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pMenu->SetDefaultItem(ID_EXITICON); Q;/a F`
CPoint pt; 9)dfL?x8V{
GetCursorPos(&pt); fPa9ofU/kr
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ts~{w;c
if(id==ID_EXITICON) oMH.u^b]fT
DeleteIcon(); |AZW9
else if(id==ID_EXIT) mh/n.*E7
OnCancel(); 4Ft1@
return FALSE; Ukz;0q
} P\2M[Gu(Q
LRESULT res= CDialog::WindowProc(message, wParam, lParam);
#;KsJb)N.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $14:(<
AddIcon(); vG41C k1
return res; ~+F;q
vq
} ?9+@+q
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void CCaptureDlg::AddIcon() >h~IfZU1
{ je,}_:7
NOTIFYICONDATA data; = "ts`>
data.cbSize=sizeof(NOTIFYICONDATA); +a@GHx4-
CString tip; %|W.^q
tip.LoadString(IDS_ICONTIP); l ,|%7-
data.hIcon=GetIcon(0); a6xj\w
data.hWnd=GetSafeHwnd(); 7*+]wEs
strcpy(data.szTip,tip); >p\e0n
data.uCallbackMessage=IDM_SHELL; )(M7lq.e7
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &]6)LFm
data.uID=98; gxNL_(A
Shell_NotifyIcon(NIM_ADD,&data); <=K qcHb
ShowWindow(SW_HIDE); $D1w5o-
bTray=TRUE; RBKOM$7
} :*514N
]jMKC8uz
void CCaptureDlg::DeleteIcon() dtStTT
{ S^I,Iz+`S'
NOTIFYICONDATA data; Dr<='Ux[5
data.cbSize=sizeof(NOTIFYICONDATA); k`KGB
data.hWnd=GetSafeHwnd(); <!d"E@%v@
data.uID=98; "8f?h%t
Shell_NotifyIcon(NIM_DELETE,&data); j V3)2C}
ShowWindow(SW_SHOW); h!@,8y[B
SetForegroundWindow(); JtKp(k&
ShowWindow(SW_SHOWNORMAL); <i?a0
bTray=FALSE; ^Mkk@F&1
} `TqSQg_l
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void CCaptureDlg::OnChange() ='?:z2lJ
{ q6#<[ 4?
RegisterHotkey(); R6;Phdh<>
} b,H[I!. %
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BOOL CCaptureDlg::RegisterHotkey() .>g1$rj
{ ,$*IzL~
UpdateData(); )EM7,xMz
UCHAR mask=0; +!t}
UCHAR key=0; }CL"S_>1
if(m_bControl) q-$`k
mask|=4; -F/st
if(m_bAlt) y8Xv~4qQW
mask|=2; 5i6
hp;=
if(m_bShift) &Nl2sey
mask|=1; \5
pu|2u
key=Key_Table[m_Key.GetCurSel()]; Fe&qwq"
if(bRegistered){ \p&~,%
DeleteHotkey(GetSafeHwnd(),cKey,cMask); B1
0+*p(
bRegistered=FALSE; #^#Kcg
} I`RBj `IF
cMask=mask; BbOu/i|
cKey=key; or*HC&c7
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =v~1qWX
return bRegistered; c{#yx_)V&
} VaZn{z
8;P2A\X
四、小结 i%Z2wP.o
9<Eg}Ic
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。