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:
#cD20t
0[T>UEI? 一、实现方法
~ GW8|tw c/\$AJV.H 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:
xMAb=87_
l`A4)8Y@ #pragma data_seg("shareddata")
dn)pVti_ HHOOK hHook =NULL; //钩子句柄
81<0B@E UINT nHookCount =0; //挂接的程序数目
1_z6O!rx static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
I{0bsTp; static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
eX@7f!uz static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Hz6yy* static int KeyCount =0;
{BlKVsQ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
[M{EO) #pragma data_seg()
xFY<
ns Y!tjaL 9D 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。
bn$}U.m$- :&oUI&(o 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:
=!cI@TI [Ifhh2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
7berkU0P cKey,UCHAR cMask)
:9Vd=M6, {
(s\":5
C BOOL bAdded=FALSE;
a|v}L, for(int index=0;index<MAX_KEY;index++){
FTg4i\Wp if(hCallWnd[index]==0){
fx783 hCallWnd[index]=hWnd;
K{s%h0 HotKey[index]=cKey;
i!=28|_ HotKeyMask[index]=cMask;
]$vJK bAdded=TRUE;
0y3<Ho,+$ KeyCount++;
P6E=*^^m( break;
*KXg;777 }
l< y9ue= }
/<s$Am return bAdded;
Sp]i~#q_' }
n6a*|rE //删除热键
_ x.D< n=X BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
joN}N }U {
weOzs]uc BOOL bRemoved=FALSE;
D-8>?`n\ for(int index=0;index<MAX_KEY;index++){
-|DSfI#j if(hCallWnd[index]==hWnd){
'%m0@5|hCD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
f~.w2Cna hCallWnd[index]=NULL;
0KF)+`CC> HotKey[index]=0;
hCLXL HotKeyMask[index]=0;
ZQ^kS9N i bRemoved=TRUE;
i~IQlyGr. KeyCount--;
YORFq9a{R break;
yMNLsR~ rh }
q-.e9eoc\ }
Ur626} }
I>27U<PX return bRemoved;
4nhe *ip }
Te8BFcJG RT45@
{1GW,T!# DLL中的钩子函数如下:
/)i)wxi 3_atv'I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8i;N|:WdH {
xrT_ro8 BOOL bProcessed=FALSE;
r<oI4px if(HC_ACTION==nCode)
|zu>G9m {
(%>Sln5hq if((lParam&0xc0000000)==0xc0000000){// 有键松开
Y\T*8\h_[ switch(wParam)
x~GV#c {
&bJ98Nxl case VK_MENU:
!dLz ?0 MaskBits&=~ALTBIT;
l\^q7cXG break;
JXeqVKF case VK_CONTROL:
lq@Vb{Z MaskBits&=~CTRLBIT;
9ok|]d P break;
8m A6l0 case VK_SHIFT:
ZW2#'$b MaskBits&=~SHIFTBIT;
S'-<p<;D\B break;
yj$S?B Ee default: //judge the key and send message
1#qCD["8 break;
hkgPC- }
Z"?AaD[ for(int index=0;index<MAX_KEY;index++){
A!k} if(hCallWnd[index]==NULL)
ud:?~?j&w continue;
K23_1-mbe if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~rCnST {
9L#B"lh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
16N8h]l bProcessed=TRUE;
T *t$ }
}WGi9\9T& }
%Z{J= }
6sy%KO*A else if((lParam&0xc000ffff)==1){ //有键按下
%,,h )9 switch(wParam)
GIVs)~/Eq {
*Kzs(O case VK_MENU:
!T,7 MaskBits|=ALTBIT;
)+t5G>yKK break;
N/?MsrZw case VK_CONTROL:
]bnxOk MaskBits|=CTRLBIT;
J+*rjdI break;
Y0B*.H
Ae case VK_SHIFT:
om_&|9B) MaskBits|=SHIFTBIT;
Sw1]]-Es break;
&<Gq-IN default: //judge the key and send message
A}y1v;FB break;
oZCi_g 5i }
>qF KXzI for(int index=0;index<MAX_KEY;index++){
.`'SL''c if(hCallWnd[index]==NULL)
bOz\-=au continue;
<uTsXv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}BogE$tc {
pO+1?c43 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
d7^XP bProcessed=TRUE;
uBE,z>/,; }
tiE+x|Ju" }
`u>BtAx8 }
X3m?zQbhv if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Ba+OoS for(int index=0;index<MAX_KEY;index++){
Y!7P>?)`,X if(hCallWnd[index]==NULL)
*>'R
R< continue;
}"&(sYQ*` if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
x b0+4w| SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
FoG<$9 //lParam的意义可看MSDN中WM_KEYDOWN部分
?*s!&-KI }
&vF "I'V }
QNJG}Upl }
tJu<#hX return CallNextHookEx( hHook, nCode, wParam, lParam );
;Z`)*TRp4 }
%@&)t?/= 1I+5 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:
?0(B;[xEJ
(KQt%] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
B)Q'a3d# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
r#Fu<so, hrL<jcv| 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:
u9gr@06 .)3 2WD% LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
I coL/7k3 {
i@J,u if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
$"FdS,*qKl {
h^0mjdSp, //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
piG1&* SaveBmp();
P8VU&b\ return FALSE;
lX4p'R-h }
bvx:R ~E$ …… //其它处理及默认处理
IID(mmy6
L }
G'py)C5; Xp~]kRm9 X2uX+}h*tA 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。
}gW}Vr < 19.cf3Dh 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。
qc6IH9i` ZH(.|NaH 二、编程步骤
?W
n(ciO oSl>%} 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";
*mQit/k. >&&xJ5 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
+mA=%?l '/H(,TM 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;
eC$v0Gtq rxK0<pWJhx 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
9^ r [j?<9 5、 添加代码,编译运行程序。
YP<]f>SBt +I <Sq_- 三、程序代码
MQ*#oVqv [!&k?.*;< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
BB.TrQM.# #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
)!d1<p3 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
\`zG`f #if _MSC_VER > 1000
6EU4 #pragma once
MI(i%$R-A #endif // _MSC_VER > 1000
v)yimIHzo #ifndef __AFXWIN_H__
AE&n^vdQW #error include 'stdafx.h' before including this file for PCH
3-bcY4 #endif
*$(CiyF! #include "resource.h" // main symbols
kkBU<L2 class CHookApp : public CWinApp
n6G&^Oj {
y.:- public:
F?} *ovy CHookApp();
wWw/1i:|' // Overrides
f^4*. ~cB // ClassWizard generated virtual function overrides
txo?k/w //{{AFX_VIRTUAL(CHookApp)
~Ls I<z public:
t4@g;U?o virtual BOOL InitInstance();
:WIf$P?X virtual int ExitInstance();
Noxz kpMF //}}AFX_VIRTUAL
pqN[G=0 //{{AFX_MSG(CHookApp)
%"Q!5qH& // NOTE - the ClassWizard will add and remove member functions here.
{H;|G0tR // DO NOT EDIT what you see in these blocks of generated code !
iFG5%>5F //}}AFX_MSG
3Z:!o$ DECLARE_MESSAGE_MAP()
&PuJV + y };
-0SuREn LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
y] ]Vp~R:[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0Eu$-) BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
HoE.//b BOOL InitHotkey();
]8>UII ,US BOOL UnInit();
hS{
*l9v7 #endif
N#['fg' q;../h]Ne //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
}r~l72
` #include "stdafx.h"
e'Us(]ZO #include "hook.h"
%4|}&,%%r #include <windowsx.h>
.cS,T<$ #ifdef _DEBUG
@\`G & VB #define new DEBUG_NEW
Ym{%"EB #undef THIS_FILE
$;i$k2n: static char THIS_FILE[] = __FILE__;
m2uML*&O5K #endif
Xb@z7X#O! #define MAX_KEY 100
wu!_BCIy #define CTRLBIT 0x04
d<GG( #define ALTBIT 0x02
JJ9e{~0I #define SHIFTBIT 0x01
FR,#s^kF #pragma data_seg("shareddata")
VgsCwJ9w HHOOK hHook =NULL;
0S:!Gv+ UINT nHookCount =0;
199hQxib: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
f93rY< static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
0tm_}L$g=b static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
.cT$h?+jyl static int KeyCount =0;
pL}j
ZTo static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ym*#ZE`B! #pragma data_seg()
Pv %vx U HINSTANCE hins;
Q`p}X&^a void VerifyWindow();
%{~mk[d3 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
JNM@Q //{{AFX_MSG_MAP(CHookApp)
/zG-\e U // NOTE - the ClassWizard will add and remove mapping macros here.
MZMS?}.2 // DO NOT EDIT what you see in these blocks of generated code!
-=Eq/su% //}}AFX_MSG_MAP
oF b mz* END_MESSAGE_MAP()
U~#^ ^ X:SzkkVl7 CHookApp::CHookApp()
o(X90X {
Y6<0% // TODO: add construction code here,
!OoaE* s // Place all significant initialization in InitInstance
`YmI' }
oY2?W t`8e#n 9 CHookApp theApp;
%YvSHh;c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
W:{PBb"x8 {
X\p`pw$ BOOL bProcessed=FALSE;
BV }(djx if(HC_ACTION==nCode)
t=W$'*P0} {
ttbQergS if((lParam&0xc0000000)==0xc0000000){// Key up
WrHgF*[ switch(wParam)
g"Q}h {
PD}SPOA`U3 case VK_MENU:
HzG~I8o(d MaskBits&=~ALTBIT;
)Vg{Y [! break;
rq'##`H case VK_CONTROL:
,Og[[0g MaskBits&=~CTRLBIT;
0.u9f`04 break;
EN-8uY. case VK_SHIFT:
9o_ g_q MaskBits&=~SHIFTBIT;
}/7.+yD break;
[TbG55 default: //judge the key and send message
k67i`f= break;
HoIKx_ }
STXqq[+Rf for(int index=0;index<MAX_KEY;index++){
l?@MUsg+ if(hCallWnd[index]==NULL)
6cQeL$,SQ continue;
iJdrY6qd if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\~z?PA.$ {
wv7p,9Z[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*@ <8&M9x bProcessed=TRUE;
_>jrlIfc }
4+/fP }
Pghva*& }
e_I; y else if((lParam&0xc000ffff)==1){ //Key down
M\\e e3Ih switch(wParam)
X ]pR,\B {
Wk\mgGn+ case VK_MENU:
y(/jTS/hd MaskBits|=ALTBIT;
E'&OOEMN- break;
I8<Il^ case VK_CONTROL:
/`4v"f0V MaskBits|=CTRLBIT;
(E"&UC[ break;
Vp(D|}P case VK_SHIFT:
;1*m}uNz MaskBits|=SHIFTBIT;
HsjELbH break;
S.Wh4kMUe default: //judge the key and send message
ueWR/ break;
xUiWiOihr6 }
_S9rF-9G] for(int index=0;index<MAX_KEY;index++)
>0Fxyv8 {
Z;j/K if(hCallWnd[index]==NULL)
!F0rd9 continue;
Eu`2w%qz if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Aj8l%'h[ {
iXUWIgr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
*<`7|BH 3 bProcessed=TRUE;
pY{; Yn&t }
(xk.NZnF }
+Fc ET }
u#a%( if(!bProcessed){
HZQDe& for(int index=0;index<MAX_KEY;index++){
fbh6Ls/ if(hCallWnd[index]==NULL)
;=5@h!@R continue;
b{~fVil$y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
GN:Ru|n SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
I!|y;mh:it }
ri/t(m^{W }
n~1tm }
o|z+!, return CallNextHookEx( hHook, nCode, wParam, lParam );
]^iFqQe }
l 8O"w& B,~f " BOOL InitHotkey()
h|J;6Sm@ {
VqcBwJ!?p if(hHook!=NULL){
:[y]p7;{f nHookCount++;
33=Mm/<m$P return TRUE;
VKq0<+M }
jo 7Hyw!g else
JfI aOhKs] hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
u/z,92mmS if(hHook!=NULL)
IV)^;i nHookCount++;
>]>0KQfO return (hHook!=NULL);
XHWh'G9 }
9b?i
G BOOL UnInit()
9uA,
+ {
e(?:g@]-r if(nHookCount>1){
=jJ H^Y2 nHookCount--;
BhqhyX\D&y return TRUE;
WuBmdjZ }
DBQOxryP>o BOOL unhooked = UnhookWindowsHookEx(hHook);
8# 6\+R if(unhooked==TRUE){
pwa.q nHookCount=0;
C}n'>],p hHook=NULL;
<\>+~p, }
w@87]/ 4Rq return unhooked;
m,\i }
]b}B~jD IM@"AD52a BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A{4Dzm ! {
/m97CC#+ BOOL bAdded=FALSE;
9OPK4- for(int index=0;index<MAX_KEY;index++){
MzG5u<D if(hCallWnd[index]==0){
A ?#]s hCallWnd[index]=hWnd;
=Nw2;TkB[ HotKey[index]=cKey;
\M+MDT& HotKeyMask[index]=cMask;
smQ4CLJ bAdded=TRUE;
N2ni3M5v KeyCount++;
J
cP~-cp break;
||R0U@F, }
%_>Tcm= }
6hp{,8|D"m return bAdded;
[6O04"6K }
):/,w!1 1Wv{xML" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-UJ?L {
5(423"(y BOOL bRemoved=FALSE;
Q6u{@$(/N for(int index=0;index<MAX_KEY;index++){
p`\3if' if(hCallWnd[index]==hWnd){
ldK>HxM%Z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+-U@0&Y3M hCallWnd[index]=NULL;
h5x*NM1Ih HotKey[index]=0;
8Bj4_!g HotKeyMask[index]=0;
e"*BHvy F bRemoved=TRUE;
hiAxh
Y KeyCount--;
UIQQ\,3 break;
`(3SfQ- }
jH(&oV }
)Ea8{m! }
2@sr:,\1 return bRemoved;
FtN}]@F }
s\_l=v3 XjxPIdX_H void VerifyWindow()
>jv\Qh {
:VJV 5f{ for(int i=0;i<MAX_KEY;i++){
Z{} n8b* if(hCallWnd
!=NULL){ m#*h{U$
if(!IsWindow(hCallWnd)){ GYd]5`ri
hCallWnd=NULL; WK*S4c
HotKey=0; YwGHG{?e
HotKeyMask=0; <.}Ua(
KeyCount--; 0potz]}
} xkM] J)C
} V'j@K!)~xR
} vGMJ ^q
} Lbsr_*4t
qJ
95
BOOL CHookApp::InitInstance() ^Z#@3=
{ Z2#`}GI_m
AFX_MANAGE_STATE(AfxGetStaticModuleState()); e{0L%%2K
hins=AfxGetInstanceHandle(); Fom>'g*
InitHotkey(); q4k.f_{
return CWinApp::InitInstance(); 8bt53ta
} mL$f[
U;pe:
int CHookApp::ExitInstance() Pxqiv9D<R
{ -TTs.O8P|<
VerifyWindow(); rGQ5l1</
UnInit(); +;dXDZ2
return CWinApp::ExitInstance(); (UGol[f<
} (N0sE"_~I5
NF mc>0-
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =JW[pRI5a
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e #M iaX
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pv&^D,H,
#if _MSC_VER > 1000 t.)AggXj#
#pragma once Xu6K%]i^
#endif // _MSC_VER > 1000 P6YQK+
krjN7&
class CCaptureDlg : public CDialog Xk,>l6vc
{ Xm|ib%no
// Construction CW-A e
public: AF$\WWrB
BOOL bTray; aMJ;bQD
BOOL bRegistered; +/y]h0aa
BOOL RegisterHotkey(); a$$ Wt<&Y
UCHAR cKey; EnJ!mr
UCHAR cMask; ^N- 'xy
void DeleteIcon(); 41yOXy ;~l
void AddIcon(); J633uH}}
UINT nCount; OH6n^WKY
void SaveBmp(); cDeZMsV
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]Ik%#l.G_
// Dialog Data \$pkk6Q3,w
//{{AFX_DATA(CCaptureDlg) 6/1$<!WH
enum { IDD = IDD_CAPTURE_DIALOG }; 3m=2x5{L
CComboBox m_Key; `!i-#~n
BOOL m_bControl; Y(r@v
BOOL m_bAlt; ]JMl|e
BOOL m_bShift; `R+,1"5 =
CString m_Path; ;#/0b{XFj
CString m_Number; ; )llt
G
//}}AFX_DATA pM2a(\K,k^
// ClassWizard generated virtual function overrides <
kP+eD
//{{AFX_VIRTUAL(CCaptureDlg) |=5/Rax^
public: iM5vrz`n
virtual BOOL PreTranslateMessage(MSG* pMsg); <kbyZXV@K
protected: /S~m)$vu
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .Dw,"VHP
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u|fXP)>.
//}}AFX_VIRTUAL @cv{rr
// Implementation 1mH\k5xu
protected: FS@A8Bb
HICON m_hIcon; &HDP!SLS
// Generated message map functions Fn+?u
//{{AFX_MSG(CCaptureDlg) zwr\:Hu4
virtual BOOL OnInitDialog(); $$1qF"GF
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); F]_cbM{8/
afx_msg void OnPaint(); /3B6Mtb
afx_msg HCURSOR OnQueryDragIcon(); '~Q2!F
virtual void OnCancel(); xs!p|
afx_msg void OnAbout(); GEe`ZhG,
afx_msg void OnBrowse(); 8C7Z{@A
afx_msg void OnChange(); vAi$[p*im
//}}AFX_MSG qp~gP
DECLARE_MESSAGE_MAP() Y*LaBxt Q
}; (OmH~lSO.
#endif {{!Y]\2S
%*W<vu>H
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file UVEz;<5@\
#include "stdafx.h" a07=tD
#include "Capture.h" &`!^Zq vG
#include "CaptureDlg.h" 1*Ar{:+ua
#include <windowsx.h> n&Yk<
#pragma comment(lib,"hook.lib") #T3h}=
#ifdef _DEBUG m*e YC
#define new DEBUG_NEW jbmTmh1q
#undef THIS_FILE Z|*!y]We
static char THIS_FILE[] = __FILE__; :}q\tNY<
#endif H0*,8i5I
#define IDM_SHELL WM_USER+1 *xs!5|n+
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZafboqsDL
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .$rC0<G[K
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; f CcD&<%
class CAboutDlg : public CDialog GWP dv
{ BNucc']
public: '0t-]NAc
CAboutDlg(); P0GeZ02]
// Dialog Data buMqF-j
//{{AFX_DATA(CAboutDlg) :k,Q,B.I
enum { IDD = IDD_ABOUTBOX }; Pz"`MB<'Ik
//}}AFX_DATA U4,2 br>
// ClassWizard generated virtual function overrides l{WjDed
//{{AFX_VIRTUAL(CAboutDlg) Bl;KOR
protected: 0$vj!-Mb^j
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [_6 &N.
//}}AFX_VIRTUAL V'gw\mcb
// Implementation *cv}*D
protected: x"4%(xBu
//{{AFX_MSG(CAboutDlg) &h~aChJ
//}}AFX_MSG CAc
%f9!3
DECLARE_MESSAGE_MAP() _|{aC1Y!V
}; uB.-t^@
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =y]$0nh
{ SZ!=`a]
//{{AFX_DATA_INIT(CAboutDlg) FG-L0X
//}}AFX_DATA_INIT I!: z,t<
} Ob<W/-%5tH
H{G{H=K_
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eiMH['X5
{ 7"v$- W y
CDialog::DoDataExchange(pDX); *OTS'W~t
//{{AFX_DATA_MAP(CAboutDlg) ]s1 YaNq
//}}AFX_DATA_MAP $1Nd_pD=
} Tupiq
LXfCmc9|Z
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) C2F0tr|
//{{AFX_MSG_MAP(CAboutDlg) ${&5]!E[>D
// No message handlers rAqxTdF
//}}AFX_MSG_MAP lhLGG
END_MESSAGE_MAP() `S/wJ'c
/!xF?OmVd
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7^e +
: CDialog(CCaptureDlg::IDD, pParent) )ZR+lX}
{ /Wj,1WX~
//{{AFX_DATA_INIT(CCaptureDlg) <,%:
m_bControl = FALSE; c+' =hR[
m_bAlt = FALSE; #;tT8[Ewuw
m_bShift = FALSE; @e2}BhB2
m_Path = _T("c:\\"); OEgI_=B
m_Number = _T("0 picture captured."); ">jwh.
nCount=0; pxINw>\Qv
bRegistered=FALSE; RuRt0Sd3
bTray=FALSE; d+L#t
//}}AFX_DATA_INIT \}]iS C.2
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 TYgQJW?
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 83ipf"]*
} %:C ]7gQ
t!;/Z6\Pb
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l5t2\Fl
{ b'@we0V@S
CDialog::DoDataExchange(pDX); qCMl!g'
//{{AFX_DATA_MAP(CCaptureDlg) #
'|'r+
DDX_Control(pDX, IDC_KEY, m_Key); E8}+k o
DDX_Check(pDX, IDC_CONTROL, m_bControl); CC >=UF
DDX_Check(pDX, IDC_ALT, m_bAlt); Uu p(6`7
DDX_Check(pDX, IDC_SHIFT, m_bShift); Y}R}-+bD/
DDX_Text(pDX, IDC_PATH, m_Path); HL{$ ^l#v
DDX_Text(pDX, IDC_NUMBER, m_Number); v Y|!
//}}AFX_DATA_MAP <g2_6C\j
} T6#"8qz<
q!,zq
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) LxN*)[ Wb
//{{AFX_MSG_MAP(CCaptureDlg) UH`h OJ?
ON_WM_SYSCOMMAND() uZ6d35MJ
ON_WM_PAINT() w=b(X
q+:
ON_WM_QUERYDRAGICON() SpTdj^ ]4>
ON_BN_CLICKED(ID_ABOUT, OnAbout) rJfqA@
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ZFh+x@
ON_BN_CLICKED(ID_CHANGE, OnChange) 2YwVU.*>
//}}AFX_MSG_MAP {==pZpyyh
END_MESSAGE_MAP() d4^`}6@
Bo_ym36N
BOOL CCaptureDlg::OnInitDialog() 1qdZc_x
{ %kI}
[6J_
CDialog::OnInitDialog(); 0Ce]V,i6C>
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !|wzf+V
ASSERT(IDM_ABOUTBOX < 0xF000); 3HV%4nZLf
CMenu* pSysMenu = GetSystemMenu(FALSE); HaNboYW_K
if (pSysMenu != NULL) L wJ0
{ ilLBCS}
CString strAboutMenu; zi]%Zp
strAboutMenu.LoadString(IDS_ABOUTBOX); 5CYo7mJ6+
if (!strAboutMenu.IsEmpty()) SqPtWEq@P
{ H6kf
K5,
pSysMenu->AppendMenu(MF_SEPARATOR); pR os{Uq"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Xg<[fwW
} G&{HTYP
} 3SG?W_
SetIcon(m_hIcon, TRUE); // Set big icon P8yIegPY
SetIcon(m_hIcon, FALSE); // Set small icon JyBp-ii
m_Key.SetCurSel(0); FY0%XW
RegisterHotkey(); 'JmBh@A
CMenu* pMenu=GetSystemMenu(FALSE); oW}!vf3z
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t={0(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dJ3IUe
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pgc3jP!
return TRUE; // return TRUE unless you set the focus to a control gvavs+H%
} [uuj?Rbd
'A{h iY
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j.?:Gaab?#
{ 6DF
if ((nID & 0xFFF0) == IDM_ABOUTBOX) XJ\hd,R
{ u</8w&!
CAboutDlg dlgAbout; LgqGVh3\s
dlgAbout.DoModal(); +a)E|(cN
} GlYly5F
else I2Ev~!
{ _2Zp1h,
CDialog::OnSysCommand(nID, lParam); iw]k5<qKj
} 6F0(aGs
} $xW**&
>9K//co"of
void CCaptureDlg::OnPaint() =]>%t]
{ b Y8GA
if (IsIconic()) ISqfU]>[
{ Opg#*w%-
CPaintDC dc(this); // device context for painting +++pI.>(*Q
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); U@lV
// Center icon in client rectangle d"<F!?8
int cxIcon = GetSystemMetrics(SM_CXICON); 7nE"F!d+0
int cyIcon = GetSystemMetrics(SM_CYICON); ? Nj)6_&
CRect rect; aq>?vti1D
GetClientRect(&rect); UZxmhsv
int x = (rect.Width() - cxIcon + 1) / 2; #6> 6S;Ib
int y = (rect.Height() - cyIcon + 1) / 2; Zr/r2
// Draw the icon m#@_8_ M
dc.DrawIcon(x, y, m_hIcon); +oy*Kxs7
} wq0aF"k
else |ng%PQq)
{ !C&%T]
CDialog::OnPaint(); {w5Z7s0
} I48VNX
} " ~Q*XN2
TUTe9;)
HCURSOR CCaptureDlg::OnQueryDragIcon() Z6s5M{mE
{ W'/>et
return (HCURSOR) m_hIcon; \HSicV#i
} <|F-Dd
*8A6Q9YT
void CCaptureDlg::OnCancel() /&s}<BMHU
{ zJl_ t0
if(bTray) /6tcSg)
DeleteIcon(); s (PY/{8
CDialog::OnCancel(); /tKGwX]y
} (cV
^#SBpLw
void CCaptureDlg::OnAbout() K8Zt:yP
{ 3 wt
CAboutDlg dlg; IC~ljy]y_
dlg.DoModal(); F=Y S^
} KTmaglgp
d6b.zP
void CCaptureDlg::OnBrowse() i^g~~h
F
{ %C*^:\y
CString str; AzjMv6N
BROWSEINFO bi; ,U=E[X=H
char name[MAX_PATH]; uBeNXOre
ZeroMemory(&bi,sizeof(BROWSEINFO)); 9k`~x1Y)
bi.hwndOwner=GetSafeHwnd(); 9q|7<raS
bi.pszDisplayName=name; DrS?=C@
bi.lpszTitle="Select folder"; eP |)SU
bi.ulFlags=BIF_RETURNONLYFSDIRS; wRbw
LPITEMIDLIST idl=SHBrowseForFolder(&bi); FAtWsk*pgY
if(idl==NULL) *8-p7,D
return; =J3`@9;
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); F6&P ~H
str.ReleaseBuffer(); mQ,{=C=D
m_Path=str; w2Kq(^?
if(str.GetAt(str.GetLength()-1)!='\\') <!!nI%NC
m_Path+="\\"; ;1E_o
UpdateData(FALSE); rw*M&qg!z
} 6Ct0hk4
{PmzkT}LF
void CCaptureDlg::SaveBmp() Q
X):T#^V
{ <9N4"d!A
CDC dc; LUul7y'"
dc.CreateDC("DISPLAY",NULL,NULL,NULL); M,G8*HI"
CBitmap bm; |_I[1%&`N
int Width=GetSystemMetrics(SM_CXSCREEN); $i%HDt|
int Height=GetSystemMetrics(SM_CYSCREEN); ZbyG*5iq
bm.CreateCompatibleBitmap(&dc,Width,Height); L9J;8+ge
CDC tdc; bL
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tdc.CreateCompatibleDC(&dc); %&1$~m0
CBitmap*pOld=tdc.SelectObject(&bm); ]ut?&&*
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .h6Y<
E
tdc.SelectObject(pOld); !qS05
BITMAP btm; )|:8zDuJ
bm.GetBitmap(&btm); `D"1
gD}{A
DWORD size=btm.bmWidthBytes*btm.bmHeight; `\e'K56W6
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w 3d\0ub
BITMAPINFOHEADER bih; X&,N}9>B
bih.biBitCount=btm.bmBitsPixel; 8E-Ip>{>
bih.biClrImportant=0; d3(+ztmG!
bih.biClrUsed=0; i8eA_Q
bih.biCompression=0; :SdIU36
bih.biHeight=btm.bmHeight; x3_,nl
bih.biPlanes=1; 4V>vg2
d
bih.biSize=sizeof(BITMAPINFOHEADER); wRj~Qv~E
bih.biSizeImage=size; ^@Y9!G=
bih.biWidth=btm.bmWidth; fGo_NB
bih.biXPelsPerMeter=0; )2toL5 Q
bih.biYPelsPerMeter=0; "d:.*2Z2
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); wH!}qz/
static int filecount=0; $'y1Po'2
CString name; %Au T8
name.Format("pict%04d.bmp",filecount++); o KlF5I
name=m_Path+name; P2 |}*h5(
BITMAPFILEHEADER bfh; DWdLA~'t
bfh.bfReserved1=bfh.bfReserved2=0; |<'10
bfh.bfType=((WORD)('M'<< 8)|'B'); j}"]s/= 6
bfh.bfSize=54+size; zK,~ 37)\
bfh.bfOffBits=54; PQQgDtiH
CFile bf; VDPxue
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ LuLy6]6D;
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2,+@#q
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); V02309Y
bf.WriteHuge(lpData,size); +$'e4EwqV
bf.Close(); xL|?(pQ/BK
nCount++; vW9^hbdx
} s!bHS_\e|
GlobalFreePtr(lpData); /Ql6]8.P
if(nCount==1) ST#PMb'izn
m_Number.Format("%d picture captured.",nCount); EWSr@}2j
.
else NuHL5C?To
m_Number.Format("%d pictures captured.",nCount); W&Y4Dq^
UpdateData(FALSE); ZV0)
."^Z
} _Wq7U1v`
fQ^h{n
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )x y9X0
{ X5|?/aR}
if(pMsg -> message == WM_KEYDOWN) \%Pma8&d
{ >qr=l,Hi
if(pMsg -> wParam == VK_ESCAPE) %`bLmfm
return TRUE; GcPB'`!M
if(pMsg -> wParam == VK_RETURN) ))c*_n
return TRUE; \?aOExG
I
} rD_Ss.\^g
return CDialog::PreTranslateMessage(pMsg); D-;J;m
\
} BASO$?jf4
D86K$IT
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VG? yL2y
{ n\~"Wim<b
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Fj'\v#h
SaveBmp(); *9\oD~2Y
return FALSE; hj%}GP{{
} |j\eBCnH3
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <!$j9) ~x
CMenu pop; `PXoJl
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w; yar=n
CMenu*pMenu=pop.GetSubMenu(0); +:j4G^ V
pMenu->SetDefaultItem(ID_EXITICON); Ly@U\%.
CPoint pt; 1',+&2)oj
GetCursorPos(&pt); $u/8Rp
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &e5^v
if(id==ID_EXITICON) h5h-}qBA
DeleteIcon(); _p3WE9T
else if(id==ID_EXIT) e!O &~#'h}
OnCancel(); UFSEobhg&5
return FALSE; }[YcilU_
} P7M0Ce~iW
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0~LnnDN
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) F!DrZd>\
AddIcon(); /jn:e"0~
return res; [C*Xk{e
} 4jI*Y6Wkz
#RsIxpc
void CCaptureDlg::AddIcon() 7]0\[9DyJ
{ -0[>}!l=G
NOTIFYICONDATA data; QZeb+r
data.cbSize=sizeof(NOTIFYICONDATA); u!156X?[eU
CString tip; 2g`uC}
tip.LoadString(IDS_ICONTIP); Tg}H < T
data.hIcon=GetIcon(0); QQ2OZy>W
data.hWnd=GetSafeHwnd(); B%?|br
strcpy(data.szTip,tip); V3.vE,
data.uCallbackMessage=IDM_SHELL; @5POgQ8
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; zjhR9
data.uID=98; wZ#~+ }T
Shell_NotifyIcon(NIM_ADD,&data); X]f#w
ShowWindow(SW_HIDE); iz$v8;w
bTray=TRUE; p5D3J[?N
} D(2kb
wHDFTIDI
void CCaptureDlg::DeleteIcon() 0bRkC,N
(
{ Rg!aKdDl$
NOTIFYICONDATA data;
Y=#mx3.
data.cbSize=sizeof(NOTIFYICONDATA); 0L
4]z'5
data.hWnd=GetSafeHwnd(); Qc)RrqYNGF
data.uID=98; s`7
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Shell_NotifyIcon(NIM_DELETE,&data); pu
m9x)y1
ShowWindow(SW_SHOW); 1+y6W1m^R
SetForegroundWindow(); bl QzVp-
ShowWindow(SW_SHOWNORMAL); J0Rz.=Y
bTray=FALSE; TPmZ/c^
} &bRxy`ZH
0Ci"tA3"
void CCaptureDlg::OnChange() -^NAHE$bW
{ AfbA.-
RegisterHotkey(); gx{~5&1
} .$T:n[@
+ xu/RY_
BOOL CCaptureDlg::RegisterHotkey() Y+5A2Z)f[
{ Yi! >8
UpdateData(); wh[:wE]eX
UCHAR mask=0; Hi 0df3t
UCHAR key=0; qS`|=5f
if(m_bControl) cbHn\m)J,
mask|=4; u\& [@v
if(m_bAlt) M`,Z#)Af
mask|=2; '%r@D&*vp
if(m_bShift) 7ump:|
mask|=1; 4m~stDlN
key=Key_Table[m_Key.GetCurSel()]; Gxt<kz
if(bRegistered){ b"3T(#2<*
DeleteHotkey(GetSafeHwnd(),cKey,cMask); H<}Fk9
bRegistered=FALSE; ^# g;"K0
} uL{~(?U $
cMask=mask; e, 3(i!47
cKey=key; .j$bCKXGx
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Nb,H8;
return bRegistered; 2\8\D^
} S5JR`o
H\>I&gC'
四、小结
*Zo o
8t
35j
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。