解决应用调用qt dll时，必须要将exe和qt依赖库放在一起的问题

build-qt/HGSolution2/HGDemo/HGDemo.pro

@@ -81,6 +81,7 @@ win32 {
                         DESTDIR = ../../../../release/win/x86/Release/
                 }
                 CONFIG(debug, debug|release) {
+                        DESTDIR = ../../../build/windows/Debug
                 }
         }
         contains(QT_ARCH, x86_64){
@@ -89,6 +90,7 @@ win32 {
                         DESTDIR = ../../../../release/win/x64/Release/
                 }
                 CONFIG(debug, debug|release) {
+                        DESTDIR = ../../../build/windows/x64/Debug
                 }
         }
 }

build-qt/HGSolution2/HGSaneUI/HGSaneUI.pro

@@ -42,11 +42,9 @@ if (contains(DEFINES, OEM_HANWANG) || contains(DEFINES, OEM_LISICHENG) || contai
 }
 
 win32 {
-        SOURCES += ../../../modules/saneui/dllmain.cpp
         SOURCES += ../../../modules/saneui/qmfcapp.cpp
         SOURCES += ../../../modules/saneui/qwinhost.cpp
         SOURCES += ../../../modules/saneui/qwinwidget.cpp
-
         HEADERS += ../../../modules/saneui/qmfcapp.h
         HEADERS += ../../../modules/saneui/qwinhost.h
         HEADERS += ../../../modules/saneui/qwinwidget.h
@@ -117,6 +115,7 @@ win32 {
                         DESTDIR = ../../../../release/win/x86/Release/
                 }
                 CONFIG(debug, debug|release) {
+                        DESTDIR = ../../../build/windows/Debug
                 }
         }
         contains(QT_ARCH, x86_64){
@@ -125,6 +124,7 @@ win32 {
                         DESTDIR = ../../../../release/win/x64/Release/
                 }
                 CONFIG(debug, debug|release) {
+                    DESTDIR = ../../../build/windows/x64/Debug
                 }
         }
 }
@@ -266,6 +266,7 @@ HEADERS += \
 SOURCES += \
     ../../../modules/saneui/HGSaneUI.cpp \
     ../../../modules/saneui/dialog_device_scan.cpp \
-    ../../../modules/saneui/dialog_device_select.cpp
+    ../../../modules/saneui/dialog_device_select.cpp \
+    ../../../modules/saneui/dllmain.cpp
 
 

modules/saneui/dllmain.cpp

@@ -1,6 +1,10 @@
-#include "qmfcapp.h"
+#include "base/HGDef.h"
+#include "base/HGInc.h"
+#include "base/HGUtility.h"
+
+#if defined (HG_CMP_MSC)
+#include "qmfcapp.h"
 #include "qwinwidget.h"
-#include <windows.h>
 
 HINSTANCE g_hInst = NULL;
 bool g_ownApplication = FALSE;
@@ -10,6 +14,26 @@ BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpvReserved*/)
     if (dwReason == DLL_PROCESS_ATTACH)
     {
         g_hInst = hInstance;
+
+        HGChar moduleName[512];
+        HGBase_GetModuleName(DllMain, moduleName, 512);
+        HGChar modulePath[512];
+        HGBase_GetFilePath(moduleName, modulePath, 512);
+
+        char *env = getenv("QT_QPA_PLATFORM_PLUGIN_PATH");
+        if (NULL == env)
+        {
+            char newEnv[256];
+            sprintf(newEnv, "QT_QPA_PLATFORM_PLUGIN_PATH=%s", modulePath);
+            putenv(newEnv);
+        }
+        else if (NULL == strstr(env, modulePath))
+        {
+            char *newEnv = new char [strlen(env) + 256];
+            sprintf(newEnv, "QT_QPA_PLATFORM_PLUGIN_PATH=%s;%s", env, modulePath);
+            putenv(newEnv);
+            delete []newEnv;
+        }
     }
     else if (dwReason == DLL_PROCESS_DETACH)
     {
@@ -20,3 +44,19 @@ BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpvReserved*/)
 
     return TRUE;
 }
+#else
+
+void __attribute__((constructor)) global_load(void);
+void __attribute__((destructor)) global_unload(void);
+
+void global_load(void)
+{
+
+}
+
+void global_unload(void)
+{
+
+}
+
+#endif